首页 > 最新文献

International Journal of Concrete Structures and Materials最新文献

英文 中文
Structural Behavior of Construction Joints in a Composite Rigid-Frame Bridge 某组合刚构桥施工缝结构性能研究
3区 工程技术 Q1 Engineering Pub Date : 2023-10-23 DOI: 10.1186/s40069-023-00614-3
Sanghyeon Cho, Jungho Choi, Heeyoung Lee, Wonseok Chung
Abstract Composite rigid-frame bridges with steel girders have excellent structural performance, but behavioral inconsistency appears at the connection between the steel girder and concrete pier. In addition, composite rigid-frame bridges are challenging to construct owing to the need to connect different materials at the pier. Therefore, this study developed and demonstrated a composite rigid-frame bridge with a construction joint and anchors. The structural performance and composite behavior of the proposed construction joint were investigated by evaluating a direct connection between the girder and concrete prior to casting (Joint A), a plain construction joint (Joint B), and a construction joint with anchors (Joint C). Joints B and C exhibited 16.5% and 46.5% higher ultimate capacities, respectively, than did Joint A. Finite element analysis of Joint C was conducted, and its results were verified against the experimental results. Further, parameter analysis was performed to determine the effects of the steel girder strength and anchor diameter. The results indicated that the proposed construction joint with anchors exhibited excellent structural performance and composite behavior.
摘要钢梁组合刚构桥具有优良的结构性能,但在钢梁与混凝土墩的连接处存在行为不一致的问题。此外,由于需要在桥墩处连接不同的材料,复合刚构桥的建造具有挑战性。因此,本研究开发并演示了一种具有施工缝和锚杆的组合刚构桥。通过评估浇筑前梁与混凝土的直接连接(节点a)、平面施工节点(节点B)和带锚的施工节点(节点C),研究了所提出的施工节点的结构性能和复合性能。节点B和C的极限承载力分别比节点a高16.5%和46.5%。进一步进行了参数分析,确定了钢梁强度和锚杆直径的影响。结果表明,所设计的锚杆施工缝具有良好的结构性能和复合性能。
{"title":"Structural Behavior of Construction Joints in a Composite Rigid-Frame Bridge","authors":"Sanghyeon Cho, Jungho Choi, Heeyoung Lee, Wonseok Chung","doi":"10.1186/s40069-023-00614-3","DOIUrl":"https://doi.org/10.1186/s40069-023-00614-3","url":null,"abstract":"Abstract Composite rigid-frame bridges with steel girders have excellent structural performance, but behavioral inconsistency appears at the connection between the steel girder and concrete pier. In addition, composite rigid-frame bridges are challenging to construct owing to the need to connect different materials at the pier. Therefore, this study developed and demonstrated a composite rigid-frame bridge with a construction joint and anchors. The structural performance and composite behavior of the proposed construction joint were investigated by evaluating a direct connection between the girder and concrete prior to casting (Joint A), a plain construction joint (Joint B), and a construction joint with anchors (Joint C). Joints B and C exhibited 16.5% and 46.5% higher ultimate capacities, respectively, than did Joint A. Finite element analysis of Joint C was conducted, and its results were verified against the experimental results. Further, parameter analysis was performed to determine the effects of the steel girder strength and anchor diameter. The results indicated that the proposed construction joint with anchors exhibited excellent structural performance and composite behavior.","PeriodicalId":13832,"journal":{"name":"International Journal of Concrete Structures and Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135365384","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
An Empirical Model to Predict Chloride Penetrations in Concrete Containing Palm Oil Fuel Ash Based on 10-Year Exposure Under Marine Environment 海洋环境下基于10年暴露的棕榈油灰混凝土氯离子渗透预测经验模型
3区 工程技术 Q1 Engineering Pub Date : 2023-10-16 DOI: 10.1186/s40069-023-00621-4
Wichian Chalee, Amornchai Jaiyong, Tieng Cheewaket, Chai Jaturapitakkul
Abstract The main objective of this study is to develop an empirical model for predicting the chloride penetration into concrete exposed to the sea water along shorelines. Concrete mixed with 0–50% of palm oil fuel ash, using W/B ratio of 0.40–0.50 were examined. Available database of concrete samples under the sea water submersion at 1, 3, 5, 7 and 10 years was collected. The study found that the developed empirical model could predict total chloride content in palm oil fuel ash concrete at any position below the concrete surface, which had been submerged under sea water for 1 year and over. The W/B ratio is also limited between 0.40 and 0.50. Application of this model is valid in the situation where penetration of chloride is in one direction. It was also shown that the margin of errors in this study is within ± 35% range when compared to the results presented by other researchers.
摘要本研究的主要目的是建立一个经验模型来预测氯化物在海岸线暴露于海水中的混凝土中的渗透。混凝土掺入0-50%的棕榈油燃料灰,采用W/B比为0.40-0.50进行了试验。收集了海水浸泡1、3、5、7和10年混凝土样品的现有数据库。研究发现,所建立的经验模型可以预测浸没在海水下1年及以上的棕榈油燃料灰混凝土表面以下任意位置的总氯含量。W/B比率也被限制在0.40 - 0.50之间。该模型适用于氯离子单向渗透的情况。与其他研究人员的结果相比,本研究的误差幅度在±35%范围内。
{"title":"An Empirical Model to Predict Chloride Penetrations in Concrete Containing Palm Oil Fuel Ash Based on 10-Year Exposure Under Marine Environment","authors":"Wichian Chalee, Amornchai Jaiyong, Tieng Cheewaket, Chai Jaturapitakkul","doi":"10.1186/s40069-023-00621-4","DOIUrl":"https://doi.org/10.1186/s40069-023-00621-4","url":null,"abstract":"Abstract The main objective of this study is to develop an empirical model for predicting the chloride penetration into concrete exposed to the sea water along shorelines. Concrete mixed with 0–50% of palm oil fuel ash, using W/B ratio of 0.40–0.50 were examined. Available database of concrete samples under the sea water submersion at 1, 3, 5, 7 and 10 years was collected. The study found that the developed empirical model could predict total chloride content in palm oil fuel ash concrete at any position below the concrete surface, which had been submerged under sea water for 1 year and over. The W/B ratio is also limited between 0.40 and 0.50. Application of this model is valid in the situation where penetration of chloride is in one direction. It was also shown that the margin of errors in this study is within ± 35% range when compared to the results presented by other researchers.","PeriodicalId":13832,"journal":{"name":"International Journal of Concrete Structures and Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136077606","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Experimental Study on Effect of Recycled Reinforced Concrete Waste on Mechanical Properties and Structural behaviour of the Sandy Soil 再生钢筋混凝土废料对砂土力学性能和结构特性影响的试验研究
3区 工程技术 Q1 Engineering Pub Date : 2023-10-09 DOI: 10.1186/s40069-023-00612-5
Ali Basha, Fatma khalifa, Sabry Fayed
Abstract In recent years, constructing natural aggregates as a base layer for the roads has increased. Natural resources will run out as long as human consumption of them continues. Recycled concrete aggregate (RC) has thus emerged as a substitute material for the building of road base layers. Additionally, RC can be utilized to create interior city highways. The base layer for roads must have sufficient strength to support the working load on the pavement surface without damage deforming. As a result, the focus of this paper is on enhancing the structural performance of sandy soil reinforced with various RC percentages. The three key factors are relative soil density (Dr = 83 and 97%), recycled concrete aggregate reinforcing levels (RC = 0,5,10,15,20,25,30,40,50 and 100%), and reinforcement layer thickness (R d = 0.0B, 0.5B, B, and 2B where B is the footing model width). Numerous laboratory experiments were conducted in order to examine the impact of important parameters on the properties of the mixtures. The plate bearing tests were carried out using a footing model (250 × 250 mm) inside a tank (1500 × 1500x1000 mm) to ascertain the stress–strain response, bearing capacity ratio (BCR), ultimate bearing capacity, and modulus of elasticity of the tested mixtures. It is clear that raising the RC has no effect on the diameters of the grains. It was found that as RC increased, the mixture's bulk density increased but specific gravity decreased. Maximum dry density rose as RC rose, whereas water content fell. It was noted that BCR unquestionably increased as RC increased for all RC levels and all values of settlement ratios. The appropriate reinforcing layer thickness is suggested to be no more than 2B. As the RC concentration in the sand and R d increased, the difference between two pressure-settlement curves of densities 83% and 97% significantly decreased. Furthermore, when RC reaches 50%, two curves are roughly comparable. At RC = 50%, it is advised that the relative density of 83% is sufficient to produce the same behavior as the relative density of 97%. It was found that as RC and R d grew, the tested mixtures' ultimate bearing capacity and elasticity modulus increased as well. A novel proposed formulas are developed to compute bearing capacity ratio, ultimate bearing capacity, and elasticity modulus of the tested mixtures taking into account the influence of RC, reinforcement layer depth, settlement ratio, and the relative density, and its results agree with the experimental results.
摘要近年来,天然骨料作为道路基层的建设越来越多。只要人类继续消耗自然资源,自然资源就会枯竭。再生混凝土骨料(RC)因此成为道路基层建筑的替代材料。此外,钢筋混凝土还可以用于建造城市内部公路。道路基层必须有足够的强度来支撑路面上的工作荷载而不发生损伤变形。因此,本文的重点是提高不同比例钢筋混凝土加筋砂土的结构性能。三个关键因素是相对土密度(Dr = 83和97%)、再生混凝土骨料配筋水平(RC = 0、5、10、15、20、25、30、40、50和100%)和配筋层厚度(rd = 0.0B、0.5B、B和2B,其中B为基础模型宽度)。为了检验重要参数对混合物性能的影响,进行了大量的实验室实验。采用基础模型(250 × 250 mm),在1500 × 1500x1000 mm的槽内进行板承载试验,确定试验混合料的应力应变响应、承载力比(BCR)、极限承载力和弹性模量。很明显,提高RC对晶粒直径没有影响。随着RC的增加,混合料的容重增大,比重减小。最大干密度随RC的增大而增大,含水量则随RC的增大而减小。值得注意的是,对于所有RC水平和所有沉降比值,BCR无疑随着RC的增加而增加。建议适当的补强层厚度不大于2B。随着砂土中RC浓度和R d浓度的增加,密度83%和97%两条压力沉降曲线的差值显著减小。此外,当RC达到50%时,两条曲线大致可比较。在RC = 50%时,建议83%的相对密度足以产生与97%的相对密度相同的行为。结果表明,随着RC和rd的增大,试验混合料的极限承载力和弹性模量均增大。考虑RC、配筋层深度、沉降比和相对密度的影响,提出了计算试验混合料承载力比、极限承载力和弹性模量的新公式,计算结果与试验结果吻合。
{"title":"Experimental Study on Effect of Recycled Reinforced Concrete Waste on Mechanical Properties and Structural behaviour of the Sandy Soil","authors":"Ali Basha, Fatma khalifa, Sabry Fayed","doi":"10.1186/s40069-023-00612-5","DOIUrl":"https://doi.org/10.1186/s40069-023-00612-5","url":null,"abstract":"Abstract In recent years, constructing natural aggregates as a base layer for the roads has increased. Natural resources will run out as long as human consumption of them continues. Recycled concrete aggregate (RC) has thus emerged as a substitute material for the building of road base layers. Additionally, RC can be utilized to create interior city highways. The base layer for roads must have sufficient strength to support the working load on the pavement surface without damage deforming. As a result, the focus of this paper is on enhancing the structural performance of sandy soil reinforced with various RC percentages. The three key factors are relative soil density (Dr = 83 and 97%), recycled concrete aggregate reinforcing levels (RC = 0,5,10,15,20,25,30,40,50 and 100%), and reinforcement layer thickness (R d = 0.0B, 0.5B, B, and 2B where B is the footing model width). Numerous laboratory experiments were conducted in order to examine the impact of important parameters on the properties of the mixtures. The plate bearing tests were carried out using a footing model (250 × 250 mm) inside a tank (1500 × 1500x1000 mm) to ascertain the stress–strain response, bearing capacity ratio (BCR), ultimate bearing capacity, and modulus of elasticity of the tested mixtures. It is clear that raising the RC has no effect on the diameters of the grains. It was found that as RC increased, the mixture's bulk density increased but specific gravity decreased. Maximum dry density rose as RC rose, whereas water content fell. It was noted that BCR unquestionably increased as RC increased for all RC levels and all values of settlement ratios. The appropriate reinforcing layer thickness is suggested to be no more than 2B. As the RC concentration in the sand and R d increased, the difference between two pressure-settlement curves of densities 83% and 97% significantly decreased. Furthermore, when RC reaches 50%, two curves are roughly comparable. At RC = 50%, it is advised that the relative density of 83% is sufficient to produce the same behavior as the relative density of 97%. It was found that as RC and R d grew, the tested mixtures' ultimate bearing capacity and elasticity modulus increased as well. A novel proposed formulas are developed to compute bearing capacity ratio, ultimate bearing capacity, and elasticity modulus of the tested mixtures taking into account the influence of RC, reinforcement layer depth, settlement ratio, and the relative density, and its results agree with the experimental results.","PeriodicalId":13832,"journal":{"name":"International Journal of Concrete Structures and Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135095486","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Steel Fiber Reinforced Self-Compacting Concrete: A Comprehensive Review 钢纤维增强自密实混凝土综述
3区 工程技术 Q1 Engineering Pub Date : 2023-10-05 DOI: 10.1186/s40069-023-00602-7
Jawad Ahmad, Zhiguang Zhou, Ahmed Farouk Deifalla
Abstract Self-compacting concrete (SCC), which flows under its own weight without being compacted or vibrating, requires no outside mechanical force to move. But like normal concrete, SCC has a brittle character (weak in tension) that causes sudden collapse with no advance notification. The tensile capacity of SCC has increased owing to the addition of steel fiber (SF). Various research concentrates on increasing the tensile strength (TS) of SCC by incorporating SF. To collect information on past research, present research developments, and future research directions on SF-reinforced SCC, however, a detailed review of the study is necessary. The main aspects of this review are the general introduction of SCC, fresh properties namely slump flow, slump T50, L box, and V funnel, and strength properties such as compressive, tensile, flexure, and elastic modulus. Furthermore, failure modes of steel fiber-reinforced SCC are also reviewed. Results suggest that the SF decreased the filling and passing ability. Furthermore, improvement in strength properties was also observed. However, some studies reported that SF had no effect or even decreased compressive capacity. Additionally, SF improved the tensile capacity of SCC and avoid undesirable brittle failure. Finally, the review recommends the substitution of secondary cementitious materials in SF-reinforced SCC to improve its compressive capacity.
自密实混凝土(SCC)在自身重量下流动而不被压实或振动,不需要外界的机械力来移动。但与普通混凝土一样,SCC具有脆性(张力弱),会在没有事先通知的情况下导致突然倒塌。钢纤维(SF)的加入提高了SCC的抗拉性能。各种研究都集中在通过添加SF来提高SCC的抗拉强度(TS)。然而,为了收集关于sf增强SCC的过去研究、当前研究进展和未来研究方向的信息,有必要对研究进行详细的回顾。本综述的主要方面是SCC的一般介绍,新鲜特性即坍落度流动,坍落度T50, L盒和V漏斗,以及强度特性如压缩,拉伸,弯曲和弹性模量。此外,还对钢纤维增强SCC的破坏模式进行了综述。结果表明,SF降低了充填和通过能力。此外,还观察到强度性能的改善。然而,一些研究报道SF对抗压能力没有影响甚至降低。此外,SF提高了SCC的抗拉能力,避免了SCC的脆性破坏。最后,该综述建议替代二次胶凝材料在sf增强SCC,以提高其抗压能力。
{"title":"Steel Fiber Reinforced Self-Compacting Concrete: A Comprehensive Review","authors":"Jawad Ahmad, Zhiguang Zhou, Ahmed Farouk Deifalla","doi":"10.1186/s40069-023-00602-7","DOIUrl":"https://doi.org/10.1186/s40069-023-00602-7","url":null,"abstract":"Abstract Self-compacting concrete (SCC), which flows under its own weight without being compacted or vibrating, requires no outside mechanical force to move. But like normal concrete, SCC has a brittle character (weak in tension) that causes sudden collapse with no advance notification. The tensile capacity of SCC has increased owing to the addition of steel fiber (SF). Various research concentrates on increasing the tensile strength (TS) of SCC by incorporating SF. To collect information on past research, present research developments, and future research directions on SF-reinforced SCC, however, a detailed review of the study is necessary. The main aspects of this review are the general introduction of SCC, fresh properties namely slump flow, slump T50, L box, and V funnel, and strength properties such as compressive, tensile, flexure, and elastic modulus. Furthermore, failure modes of steel fiber-reinforced SCC are also reviewed. Results suggest that the SF decreased the filling and passing ability. Furthermore, improvement in strength properties was also observed. However, some studies reported that SF had no effect or even decreased compressive capacity. Additionally, SF improved the tensile capacity of SCC and avoid undesirable brittle failure. Finally, the review recommends the substitution of secondary cementitious materials in SF-reinforced SCC to improve its compressive capacity.","PeriodicalId":13832,"journal":{"name":"International Journal of Concrete Structures and Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134947614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Concrete Made with Partial Substitutions of Wheat Straw Ash: A Review 麦秸灰部分替代混凝土的研究进展
3区 工程技术 Q1 Engineering Pub Date : 2023-10-02 DOI: 10.1186/s40069-023-00616-1
Jawad Ahmad, Mohamed Moafak Arbili, Muwaffaq Alqurashi, Fadi Althoey, Ahmed Farouk Deifalla
Abstract Many scientists are now focusing their attention on the utilization of valuable industrial or agricultural wastes as the primary raw material for the construction sector. These wastes, on the other hand, are affordable and readily accessible, making them ideal for commercial use while also contributing to the reduction of environmental degradation. Wheat straw ash (WTSA) is a kind of agricultural waste that has the potential to be utilized in concrete. Although many researchers are focused on utilization of WTSA in concrete. However, an updated review is required which provides easy access for the reader to get an idea about the benefits of WTSA in concrete. Therefore, this study provides a comprehensive review of the utilization of WTSA as a concrete ingredient. Physical and chemical compositions of WTSA, flowability, mechanical strength (compressive, flexure, tensile strength, and elastic modulus), and durability properties (permeability, carbonation, ultrasonic pulse velocity, alkali-silica reaction and chloride attacks) are the main aspects of this review. Results indicate that the performance of concrete improved with partial substitutions of cement with WTSA but simultaneously decreased the flowability of concrete. The optimum dose is important as higher dose results in decreased mechanical strength. The typical optimum dose ranges from 10 to 20% by weight of the binder. The performance of concrete in terms of durability was also improved but less research is carried out on the durability performance of concrete with WTSA. Additionally, despite WTSA's improvement in mechanical strength, concrete still exhibits lower tensile strain, which leads to brittle failure. Therefore, it was recommended that further study should be done to increase its tensile strength.
摘要利用有价值的工业或农业废弃物作为建筑行业的主要原料,是许多科学家关注的焦点。另一方面,这些废物价格低廉,容易获得,因此是商业用途的理想选择,同时也有助于减少环境退化。麦秸灰是一种极具开发利用潜力的农业废弃物。尽管许多研究者关注的是WTSA在混凝土中的应用。然而,需要进行更新的审查,以便读者能够轻松了解混凝土中WTSA的好处。因此,本研究对WTSA作为一种具体成分的应用进行了全面的综述。本文主要综述了WTSA的理化成分、流动性、机械强度(抗压、抗折、抗拉强度和弹性模量)和耐久性(透气性、碳酸化、超声脉冲速度、碱-硅反应和氯化物侵蚀)。结果表明,WTSA部分替代水泥可改善混凝土的性能,但同时降低了混凝土的流动性。最佳剂量很重要,因为较高的剂量会导致机械强度下降。典型的最佳剂量范围为按粘合剂重量计的10%至20%。混凝土在耐久性方面的性能也有所提高,但对掺加WTSA的混凝土耐久性的研究较少。此外,尽管WTSA提高了混凝土的机械强度,但混凝土仍然表现出较低的拉伸应变,从而导致脆性破坏。因此,建议进一步研究提高其抗拉强度。
{"title":"Concrete Made with Partial Substitutions of Wheat Straw Ash: A Review","authors":"Jawad Ahmad, Mohamed Moafak Arbili, Muwaffaq Alqurashi, Fadi Althoey, Ahmed Farouk Deifalla","doi":"10.1186/s40069-023-00616-1","DOIUrl":"https://doi.org/10.1186/s40069-023-00616-1","url":null,"abstract":"Abstract Many scientists are now focusing their attention on the utilization of valuable industrial or agricultural wastes as the primary raw material for the construction sector. These wastes, on the other hand, are affordable and readily accessible, making them ideal for commercial use while also contributing to the reduction of environmental degradation. Wheat straw ash (WTSA) is a kind of agricultural waste that has the potential to be utilized in concrete. Although many researchers are focused on utilization of WTSA in concrete. However, an updated review is required which provides easy access for the reader to get an idea about the benefits of WTSA in concrete. Therefore, this study provides a comprehensive review of the utilization of WTSA as a concrete ingredient. Physical and chemical compositions of WTSA, flowability, mechanical strength (compressive, flexure, tensile strength, and elastic modulus), and durability properties (permeability, carbonation, ultrasonic pulse velocity, alkali-silica reaction and chloride attacks) are the main aspects of this review. Results indicate that the performance of concrete improved with partial substitutions of cement with WTSA but simultaneously decreased the flowability of concrete. The optimum dose is important as higher dose results in decreased mechanical strength. The typical optimum dose ranges from 10 to 20% by weight of the binder. The performance of concrete in terms of durability was also improved but less research is carried out on the durability performance of concrete with WTSA. Additionally, despite WTSA's improvement in mechanical strength, concrete still exhibits lower tensile strain, which leads to brittle failure. Therefore, it was recommended that further study should be done to increase its tensile strength.","PeriodicalId":13832,"journal":{"name":"International Journal of Concrete Structures and Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135791284","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Research of Nano-modified Plain Cement Concrete Mixtures and Cement-Based Concrete 纳米改性素水泥混凝土混合料及水泥基混凝土的研究
3区 工程技术 Q1 Engineering Pub Date : 2023-09-18 DOI: 10.1186/s40069-023-00601-8
Shilin Yang, Andrii Bieliatynskyi, Viacheslav Trachevskyi, Meiyu Shao, Mingyang Ta
Abstract The use of complex modifiers for plain cement concrete mixtures and concrete is becoming increasingly popular in modern materials science. The article presents studies of the influence of a polymer additive structured by carbon nanomaterials on physical and mechanical characteristics of plain cement concrete mixtures. IR spectroscopy and thermogravimetry have shown that the use of carbon nanomaterials significantly altered the structure of plain cement concrete mixtures. As a result of the fact that the high-strength nanomaterial is the center of crystallization of cement rock newly formed structures, a denser reinforced microstructure is formed, which significantly increases the strength properties of plain cement concrete mixtures. The inclusion of a polymer complex additive in plain cement concrete mixtures leads to higher and longer plasticizing, which plays an important role in the production of monolithic products. It was determined that, in the presence of a complex modifier (polymer additive structured by carbon nanotubes), the crystalline structure of calcium hydrosilicates is compacted, which causes high physical and mechanical characteristics of modified plain cement concrete mixtures. It has been experimentally shown that the additive Ethacryl HF (France) from the class of polycarboxylates, chosen for research, acts as an accelerator for setting and curing cement paste, and also increases its strength characteristics. In general, in this study, there is a water-reducing effect from the application of the additive for all plain cement concrete mixtures. Water requirements are reduced by 5 mas. %, while the strength is increased by 19%. The formulation of plain cement concrete mixtures modified by polymer additives, structured by carbon nanotubes, with high performance were developed.
在现代材料科学中,使用复合改性剂对素水泥混凝土混合料和混凝土进行改性是越来越受欢迎的研究方向。本文研究了碳纳米结构聚合物添加剂对普通水泥混凝土混合料物理力学特性的影响。红外光谱和热重分析表明,碳纳米材料的使用显著改变了普通水泥混凝土混合物的结构。由于高强纳米材料是水泥岩石新形成结构的结晶中心,形成了更致密的增强微观结构,从而显著提高了素水泥混凝土混合料的强度性能。在普通水泥混凝土混合料中掺入聚合物络合添加剂,可以提高混凝土的塑化程度,延长混凝土的塑化时间,这对整体产品的生产具有重要作用。结果表明,在复合改性剂(由碳纳米管构成的聚合物添加剂)的存在下,氢硅酸钙的晶体结构被压实,从而导致改性的普通水泥混凝土混合物具有较高的物理和机械特性。实验表明,研究选用的聚羧酸酯类添加剂HF乙稀(法国)对水泥浆体的固化和养护起到了促进剂的作用,并提高了水泥浆体的强度特性。总的来说,在本研究中,添加剂的应用对所有素水泥混凝土混合物都有减水效果。需水量减少5毫克。%,强度提高19%。研制了以碳纳米管为结构的聚合物改性素水泥混凝土混合料的高性能配方。
{"title":"Research of Nano-modified Plain Cement Concrete Mixtures and Cement-Based Concrete","authors":"Shilin Yang, Andrii Bieliatynskyi, Viacheslav Trachevskyi, Meiyu Shao, Mingyang Ta","doi":"10.1186/s40069-023-00601-8","DOIUrl":"https://doi.org/10.1186/s40069-023-00601-8","url":null,"abstract":"Abstract The use of complex modifiers for plain cement concrete mixtures and concrete is becoming increasingly popular in modern materials science. The article presents studies of the influence of a polymer additive structured by carbon nanomaterials on physical and mechanical characteristics of plain cement concrete mixtures. IR spectroscopy and thermogravimetry have shown that the use of carbon nanomaterials significantly altered the structure of plain cement concrete mixtures. As a result of the fact that the high-strength nanomaterial is the center of crystallization of cement rock newly formed structures, a denser reinforced microstructure is formed, which significantly increases the strength properties of plain cement concrete mixtures. The inclusion of a polymer complex additive in plain cement concrete mixtures leads to higher and longer plasticizing, which plays an important role in the production of monolithic products. It was determined that, in the presence of a complex modifier (polymer additive structured by carbon nanotubes), the crystalline structure of calcium hydrosilicates is compacted, which causes high physical and mechanical characteristics of modified plain cement concrete mixtures. It has been experimentally shown that the additive Ethacryl HF (France) from the class of polycarboxylates, chosen for research, acts as an accelerator for setting and curing cement paste, and also increases its strength characteristics. In general, in this study, there is a water-reducing effect from the application of the additive for all plain cement concrete mixtures. Water requirements are reduced by 5 mas. %, while the strength is increased by 19%. The formulation of plain cement concrete mixtures modified by polymer additives, structured by carbon nanotubes, with high performance were developed.","PeriodicalId":13832,"journal":{"name":"International Journal of Concrete Structures and Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135110868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Experimental Study of the Flexural Behaviour of RC Beams Made of Eco-friendly Sawdust Concrete and Strengthened by a Wooden Plate 木屑环保混凝土配板加固RC梁抗弯性能试验研究
3区 工程技术 Q1 Engineering Pub Date : 2023-09-12 DOI: 10.1186/s40069-023-00617-0
Ahmed M. Maglad, Walid Mansour, Sabry Fayed, Bassam A. Tayeh, Ahmed M. Yosri, M. Hamad
Abstract In this paper, the effectiveness of the strengthening by a wooden plate for reinforced concrete (RC) beams that incorporate waste sawdust (SD) as a partial substitute for fine aggregate (sand) has been investigated. To this end, two types of concrete mixtures were made: normal concrete (NC) and sawdust concrete (SDC), which was made by substituting 15% of the volume of sand with SD. Five RC beams (100 mm in depth, 200 mm in width, and 1500 mm in length) were experimentally tested for flexural behavior under four-point loading. Three strengthening schemes were used in this study. The first scheme used a wooden plate that was only fixed by an adhesive layer. The second and third schemes were applied by a wooden plate, which was fixed by an adhesive layer and steel angles (two and eleven angles). The findings of the study indicate that although the concrete's workability, compressive, and splitting tensile strengths were reduced with the addition of SD, the ultimate load of the beam with SD was lower than that of the control beam, with a slight variation of approximately 4%. Moreover, strengthening the RC beam with a wooden plate and two steel angles yielded the highest load capacity among all tested beams, 20% higher than the control specimen. The study's findings offered useful information for developing eco-friendly sawdust concrete beams with efficient strengthening techniques for potential future uses.
摘要本文研究了废木屑(SD)作为部分替代细骨料(砂)的钢筋混凝土(RC)梁的木板加固效果。为此,配制了两种类型的混凝土混合物:普通混凝土(NC)和锯末混凝土(SDC),锯末混凝土是用SD代替15%体积的沙子制成的。5根RC梁(深100毫米,宽200毫米,长1500毫米)在四点荷载下进行了抗弯性能试验。本研究采用了三种强化方案。第一个方案使用了一个只用粘合剂层固定的木板。第二种和第三种方案采用木板,通过胶粘剂层和钢角(2角和11角)固定。研究结果表明,虽然掺SD降低了混凝土的工作性、抗压强度和劈裂抗拉强度,但掺SD梁的极限荷载比对照梁的极限荷载低,变化幅度约为4%。在所有试验梁中,加板加角钢加固梁的承载力最高,比对照梁提高20%。这项研究的发现为开发具有有效加强技术的环保木屑混凝土梁提供了有用的信息,以供未来使用。
{"title":"Experimental Study of the Flexural Behaviour of RC Beams Made of Eco-friendly Sawdust Concrete and Strengthened by a Wooden Plate","authors":"Ahmed M. Maglad, Walid Mansour, Sabry Fayed, Bassam A. Tayeh, Ahmed M. Yosri, M. Hamad","doi":"10.1186/s40069-023-00617-0","DOIUrl":"https://doi.org/10.1186/s40069-023-00617-0","url":null,"abstract":"Abstract In this paper, the effectiveness of the strengthening by a wooden plate for reinforced concrete (RC) beams that incorporate waste sawdust (SD) as a partial substitute for fine aggregate (sand) has been investigated. To this end, two types of concrete mixtures were made: normal concrete (NC) and sawdust concrete (SDC), which was made by substituting 15% of the volume of sand with SD. Five RC beams (100 mm in depth, 200 mm in width, and 1500 mm in length) were experimentally tested for flexural behavior under four-point loading. Three strengthening schemes were used in this study. The first scheme used a wooden plate that was only fixed by an adhesive layer. The second and third schemes were applied by a wooden plate, which was fixed by an adhesive layer and steel angles (two and eleven angles). The findings of the study indicate that although the concrete's workability, compressive, and splitting tensile strengths were reduced with the addition of SD, the ultimate load of the beam with SD was lower than that of the control beam, with a slight variation of approximately 4%. Moreover, strengthening the RC beam with a wooden plate and two steel angles yielded the highest load capacity among all tested beams, 20% higher than the control specimen. The study's findings offered useful information for developing eco-friendly sawdust concrete beams with efficient strengthening techniques for potential future uses.","PeriodicalId":13832,"journal":{"name":"International Journal of Concrete Structures and Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135824871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Effect of Superplasticizers on Eco-friendly Low-Energy One-Part Alkali-Activated Slag 高效减水剂对环保型低能耗单组分碱渣的影响
IF 3.4 3区 工程技术 Q1 Engineering Pub Date : 2023-09-06 DOI: 10.1186/s40069-023-00615-2
M. Refaie, Alaa Mohsen, El-Sayed A. R. Nasr, M. Kohail
{"title":"The Effect of Superplasticizers on Eco-friendly Low-Energy One-Part Alkali-Activated Slag","authors":"M. Refaie, Alaa Mohsen, El-Sayed A. R. Nasr, M. Kohail","doi":"10.1186/s40069-023-00615-2","DOIUrl":"https://doi.org/10.1186/s40069-023-00615-2","url":null,"abstract":"","PeriodicalId":13832,"journal":{"name":"International Journal of Concrete Structures and Materials","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2023-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48758196","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Numerical and Experimental Analysis to Develop a SB6/H3 High Containment Level Concrete Median Barrier SB6/H3型高安全壳混凝土中隔墙的数值和实验分析
IF 3.4 3区 工程技术 Q1 Engineering Pub Date : 2023-09-05 DOI: 10.1186/s40069-023-00610-7
Yoseok Jeong, Ilkeun Lee, Jaeha Lee, Kyeongjin Kim, Geun-Hyung Min, Wooseok Kim
{"title":"Numerical and Experimental Analysis to Develop a SB6/H3 High Containment Level Concrete Median Barrier","authors":"Yoseok Jeong, Ilkeun Lee, Jaeha Lee, Kyeongjin Kim, Geun-Hyung Min, Wooseok Kim","doi":"10.1186/s40069-023-00610-7","DOIUrl":"https://doi.org/10.1186/s40069-023-00610-7","url":null,"abstract":"","PeriodicalId":13832,"journal":{"name":"International Journal of Concrete Structures and Materials","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2023-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45280958","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Seawater-Mixed Lightweight Aggregate Concretes with Dune Sand, Waste Glass and Nanosilica: Experimental and Life Cycle Analysis 含沙丘砂、废玻璃和纳米二氧化硅的海水混合轻骨料混凝土:实验和生命周期分析
IF 3.4 3区 工程技术 Q1 Engineering Pub Date : 2023-09-01 DOI: 10.1186/s40069-023-00613-4
P. Sikora, Levent Afsar, Sundar Rathnarajan, M. Nikravan, Sang-Yeop Chung, D. Stephan, Mohamed Abd Elrahman
{"title":"Seawater-Mixed Lightweight Aggregate Concretes with Dune Sand, Waste Glass and Nanosilica: Experimental and Life Cycle Analysis","authors":"P. Sikora, Levent Afsar, Sundar Rathnarajan, M. Nikravan, Sang-Yeop Chung, D. Stephan, Mohamed Abd Elrahman","doi":"10.1186/s40069-023-00613-4","DOIUrl":"https://doi.org/10.1186/s40069-023-00613-4","url":null,"abstract":"","PeriodicalId":13832,"journal":{"name":"International Journal of Concrete Structures and Materials","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48578954","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
期刊
International Journal of Concrete Structures and Materials
全部 Acc. Chem. Res. ACS Applied Bio Materials ACS Appl. Electron. Mater. ACS Appl. Energy Mater. ACS Appl. Mater. Interfaces ACS Appl. Nano Mater. ACS Appl. Polym. Mater. ACS BIOMATER-SCI ENG ACS Catal. ACS Cent. Sci. ACS Chem. Biol. ACS Chemical Health & Safety ACS Chem. Neurosci. ACS Comb. Sci. ACS Earth Space Chem. ACS Energy Lett. ACS Infect. Dis. ACS Macro Lett. ACS Mater. Lett. ACS Med. Chem. Lett. ACS Nano ACS Omega ACS Photonics ACS Sens. ACS Sustainable Chem. Eng. ACS Synth. Biol. Anal. Chem. BIOCHEMISTRY-US Bioconjugate Chem. BIOMACROMOLECULES Chem. Res. Toxicol. Chem. Rev. Chem. Mater. CRYST GROWTH DES ENERG FUEL Environ. Sci. Technol. Environ. Sci. Technol. Lett. Eur. J. Inorg. Chem. IND ENG CHEM RES Inorg. Chem. J. Agric. Food. Chem. J. Chem. Eng. Data J. Chem. Educ. J. Chem. Inf. Model. J. Chem. Theory Comput. J. Med. Chem. J. Nat. Prod. J PROTEOME RES J. Am. Chem. Soc. LANGMUIR MACROMOLECULES Mol. Pharmaceutics Nano Lett. Org. Lett. ORG PROCESS RES DEV ORGANOMETALLICS J. Org. Chem. J. Phys. Chem. J. Phys. Chem. A J. Phys. Chem. B J. Phys. Chem. C J. Phys. Chem. Lett. Analyst Anal. Methods Biomater. Sci. Catal. Sci. Technol. Chem. Commun. Chem. Soc. Rev. CHEM EDUC RES PRACT CRYSTENGCOMM Dalton Trans. Energy Environ. Sci. ENVIRON SCI-NANO ENVIRON SCI-PROC IMP ENVIRON SCI-WAT RES Faraday Discuss. Food Funct. Green Chem. Inorg. Chem. Front. Integr. Biol. J. Anal. At. Spectrom. J. Mater. Chem. A J. Mater. Chem. B J. Mater. Chem. C Lab Chip Mater. Chem. Front. Mater. Horiz. MEDCHEMCOMM Metallomics Mol. Biosyst. Mol. Syst. Des. Eng. Nanoscale Nanoscale Horiz. Nat. Prod. Rep. New J. Chem. Org. Biomol. Chem. Org. Chem. Front. PHOTOCH PHOTOBIO SCI PCCP Polym. Chem.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1