In reinforced concrete buildings, the seismic behavior of RC beams with flush outside faces of beams and columns has not been verified by experiments. In this study, four large reinforced concrete beam specimens are fabricated, and the experimental verification is carried out. The research results show that: (1) All the specimens (including three beam specimens with flush outside faces of beams and columns can have ultimate drift angles of up to 4% rad; (2) The lateral strength and seismic behavior of the specimen with concrete cover of 85 mm are no less than those of the benchmark specimen, so concrete cover thickness between 85 mm and 40 mm for RC beams should be acceptable; (3) The seismic behavior of the two specimens with the lateral U-shaped auxiliary transverse reinforcement and concrete cover of 85 mm is better than that of the benchmark specimen, but the crack width of the latter specimen is wider and the spallling degree of concrete cover is more serious. It is recommended to adopt the lateral U-shaped auxiliary transverse reinforcement whose two legs extend beyond half the width of the hoop with two auxiliary longitudinal reinforcements and the same spacing as the hoop in practice.
在钢筋混凝土建筑中，梁和柱外侧齐平的钢筋混凝土梁的抗震性能尚未得到实验验证。本研究制作了四个大型钢筋混凝土梁试件，并进行了实验验证。研究结果表明(1) 所有试件（包括三个梁柱外表面齐平的梁试件）的极限漂移角可达 4% rad；(2) 混凝土覆盖层厚度为 85 mm 的试件的侧向强度和抗震性能不低于基准试件，因此混凝土覆盖层厚度在 85 mm 至 40 mm 之间的钢筋混凝土梁是可以接受的；(3）采用横向 U 型辅助钢筋且混凝土保护层厚度为 85 mm 的两个试件的抗震性能优于基准试件，但后者的裂缝宽度更大，混凝土保护层的剥落程度更严重。建议在实践中采用两脚超过箍筋宽度一半的横向 U 型辅助横向钢筋，并配以两根辅助纵向钢筋，间距与箍筋相同。
{"title":"Experimental investigation on seismic behavior of eccentric RC beams with different reinforcement configurations","authors":"Tai-Kuang Lee, Cheng-Cheng Chen, Guo-Luen Huang","doi":"10.1680/jmacr.23.00104","DOIUrl":"https://doi.org/10.1680/jmacr.23.00104","url":null,"abstract":"In reinforced concrete buildings, the seismic behavior of RC beams with flush outside faces of beams and columns has not been verified by experiments. In this study, four large reinforced concrete beam specimens are fabricated, and the experimental verification is carried out. The research results show that: (1) All the specimens (including three beam specimens with flush outside faces of beams and columns can have ultimate drift angles of up to 4% rad; (2) The lateral strength and seismic behavior of the specimen with concrete cover of 85 mm are no less than those of the benchmark specimen, so concrete cover thickness between 85 mm and 40 mm for RC beams should be acceptable; (3) The seismic behavior of the two specimens with the lateral U-shaped auxiliary transverse reinforcement and concrete cover of 85 mm is better than that of the benchmark specimen, but the crack width of the latter specimen is wider and the spallling degree of concrete cover is more serious. It is recommended to adopt the lateral U-shaped auxiliary transverse reinforcement whose two legs extend beyond half the width of the hoop with two auxiliary longitudinal reinforcements and the same spacing as the hoop in practice.","PeriodicalId":18113,"journal":{"name":"Magazine of Concrete Research","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2024-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139603186","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Maohua Zhang, Zhiyi Li, Lin Du, Zenong Tian, Dazhi Liu
The combination of multiple factors in the marine environment will accelerate the corrosion of concrete structures. Unlike earlier studies, who employed alternate experiments to evaluate the endurance of marine concrete with nanoparticles under the combined impacts of bending fatigue load, dry-wet cycles, and Cl- erosion, this paper integrates three elements in each cycle to accomplish the effect of coupling. The dry-wet cycle test of the optimal amount of nano-concrete was simulated in seawater with a concentration of 5% NaCl solution and bending fatigue loads at stress levels of 0.5, 0.6, 0.7 and 0.8 were applied. X-ray diffraction was used to observe the physical phases of the concrete before and after the experiment and to analyse the reasons for the increased durability of the concrete. The results indicated that the nanoparticles enhance the resistance to Cl- erosion during dry-wet cycles and bending fatigue load by making the nano-concrete more durable under the coupling impact of bending fatigue load, dry-wet cycles, and Cl- erosion. The improvement effect is the most obvious when the nano-TiO2 content is 1% and the improvement effect is most obvious when the nano-SiO2 content is 2%, and the improvement effect is better when the nano-TiO2 content is 1% than when the nano-SiO2 content is 2%. In comparison to the compressive zone of concrete, the free Cl- in the tension zone is larger. Microscopic tests showed that nanoparticles increase the content of hydrated calcium silicate in concrete, change the orientation of calcium hydroxide and improve the durability of concrete.
{"title":"Study on the durability of marine concrete with nanoparticles under the coupling action of bending fatigue load, dry-wet cycles and Cl−corrosion","authors":"Maohua Zhang, Zhiyi Li, Lin Du, Zenong Tian, Dazhi Liu","doi":"10.1680/jmacr.23.00062","DOIUrl":"https://doi.org/10.1680/jmacr.23.00062","url":null,"abstract":"The combination of multiple factors in the marine environment will accelerate the corrosion of concrete structures. Unlike earlier studies, who employed alternate experiments to evaluate the endurance of marine concrete with nanoparticles under the combined impacts of bending fatigue load, dry-wet cycles, and Cl- erosion, this paper integrates three elements in each cycle to accomplish the effect of coupling. The dry-wet cycle test of the optimal amount of nano-concrete was simulated in seawater with a concentration of 5% NaCl solution and bending fatigue loads at stress levels of 0.5, 0.6, 0.7 and 0.8 were applied. X-ray diffraction was used to observe the physical phases of the concrete before and after the experiment and to analyse the reasons for the increased durability of the concrete. The results indicated that the nanoparticles enhance the resistance to Cl- erosion during dry-wet cycles and bending fatigue load by making the nano-concrete more durable under the coupling impact of bending fatigue load, dry-wet cycles, and Cl- erosion. The improvement effect is the most obvious when the nano-TiO2 content is 1% and the improvement effect is most obvious when the nano-SiO2 content is 2%, and the improvement effect is better when the nano-TiO2 content is 1% than when the nano-SiO2 content is 2%. In comparison to the compressive zone of concrete, the free Cl- in the tension zone is larger. Microscopic tests showed that nanoparticles increase the content of hydrated calcium silicate in concrete, change the orientation of calcium hydroxide and improve the durability of concrete.","PeriodicalId":18113,"journal":{"name":"Magazine of Concrete Research","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2024-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139525806","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The present research aims to develop cost-effective and environmentally friendly Ultra-High Performance Concrete (UHPC) composite using fly ash and quartz powder as a sustainable alternative to cement. The performance of various constituents is examined, and their influence on fresh and hardened properties is investigated for the optimum trial mix design. The results show that a cube compressive strength of 144 MPa was achieved with fly ash content of 20% and 10% quartz powder and other ingredients without any special heat treatment. Advanced characterization studies such as heat of hydration and X-ray diffraction analysis were performed to understand the performance of fly ash blended UHPC. Further, various fracture properties, such as fracture toughness, fracture energy, brittleness number, etc., were investigated considering geometrically similar notched beam specimens for UHPC mix with 1.5% and 2.5% steel fibre content. The optimum UHPC mix achieved good scores in terms of the strength index and the carbon emission index, indicating the concrete is eco-friendly and sustainable.
{"title":"Physio-chemical, mechanical and fracture analysis of ultra-high performance cementitious composite","authors":"Awadhesh Sharma, M. A. Iqbal, S. Ray","doi":"10.1680/jmacr.23.00061","DOIUrl":"https://doi.org/10.1680/jmacr.23.00061","url":null,"abstract":"The present research aims to develop cost-effective and environmentally friendly Ultra-High Performance Concrete (UHPC) composite using fly ash and quartz powder as a sustainable alternative to cement. The performance of various constituents is examined, and their influence on fresh and hardened properties is investigated for the optimum trial mix design. The results show that a cube compressive strength of 144 MPa was achieved with fly ash content of 20% and 10% quartz powder and other ingredients without any special heat treatment. Advanced characterization studies such as heat of hydration and X-ray diffraction analysis were performed to understand the performance of fly ash blended UHPC. Further, various fracture properties, such as fracture toughness, fracture energy, brittleness number, etc., were investigated considering geometrically similar notched beam specimens for UHPC mix with 1.5% and 2.5% steel fibre content. The optimum UHPC mix achieved good scores in terms of the strength index and the carbon emission index, indicating the concrete is eco-friendly and sustainable.","PeriodicalId":18113,"journal":{"name":"Magazine of Concrete Research","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2024-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139612514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This study quantitatively compares the critical crack lengths of wet-sieved and full-graded concrete obtained from experimental measurements, the numerical simulation, with that from the analytical solution based on the linear elastic fracture mechanics formula (LEFM). The experiments are conducted on wedge-splitting specimens with depths from 200 mm to 1500 mm and a maximum aggregate size of 150 mm. Strain gauges and clip gauges are pasted and mounted along the direction of crack growth to measure the critical crack length. The numerical and analytical methods are used to calculate the critical crack length. The average relative error between the analytical calculations and measurements is still 14%, even if the specimen depth increases to 1500 mm. Additionally, the effective fracture toughness is calculated by combining the peak load and critical crack length, resulting in an average relative error of 17%. These results indicate that the existing analytical method is inadequate for determining the critical crack length. Consequently, a modified analytical method is adopted, utilizing the 95% peak load in the post-peak region and the corresponding crack mouth opening displacement (CMOD), which provides calculated results that agree well with experimental data. Furthermore, the effective fracture toughness can be reasonably derived using the critical crack lengths from the modified analytical method.
{"title":"Study on critical crack length of wet-sieved and full-graded concrete under mode I loading","authors":"Xingyu Zheng, Zhimin Wu, Mengdi Jia","doi":"10.1680/jmacr.23.00059","DOIUrl":"https://doi.org/10.1680/jmacr.23.00059","url":null,"abstract":"This study quantitatively compares the critical crack lengths of wet-sieved and full-graded concrete obtained from experimental measurements, the numerical simulation, with that from the analytical solution based on the linear elastic fracture mechanics formula (LEFM). The experiments are conducted on wedge-splitting specimens with depths from 200 mm to 1500 mm and a maximum aggregate size of 150 mm. Strain gauges and clip gauges are pasted and mounted along the direction of crack growth to measure the critical crack length. The numerical and analytical methods are used to calculate the critical crack length. The average relative error between the analytical calculations and measurements is still 14%, even if the specimen depth increases to 1500 mm. Additionally, the effective fracture toughness is calculated by combining the peak load and critical crack length, resulting in an average relative error of 17%. These results indicate that the existing analytical method is inadequate for determining the critical crack length. Consequently, a modified analytical method is adopted, utilizing the 95% peak load in the post-peak region and the corresponding crack mouth opening displacement (CMOD), which provides calculated results that agree well with experimental data. Furthermore, the effective fracture toughness can be reasonably derived using the critical crack lengths from the modified analytical method.","PeriodicalId":18113,"journal":{"name":"Magazine of Concrete Research","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2024-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139533273","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Using recycled concrete aggregates (RCAs) in concrete has emerged as a promising approach to minimize the environmental impact associated with construction and demolition waste, while simultaneously enhance the sustainability of concrete. Enhancing the quality of RCAs is crucial to instill greater confidence among material suppliers and promote the systematic utilization of RCAs in the construction industry. This study presents the use of pristine graphene suspension at 0, 0.1 and 0.2% concentrations in water for improving properties of RCAs, thereby improving mechanical and durability properties of resulting concretes incorporating 100% RCA as coarse aggregates. For this investigation, two treatment methods, including pre-spraying and pre-soaking, were used to treat the RCAs. Nano-silica with the same concentration and treatment method was also utilized to compare the results. Various strength tests including axial compressive, splitting tensile and flexural were performed. In addition, material properties such as water absorption and drying shrinkage were assessed. Microanalysis using scanning electron microscopy (SEM) and micro-CT was also employed. It is shown that, for both treatment methods investigated and nanomaterial concentrations, pristine graphene is more effective than nano-silica in increasing the strength properties and reducing the water absorption and drying shrinkage due to a lower level of material porosity. It is also found that, for a given nanomaterial concentration and type, concrete with pre-soaked RCA exhibits higher strengths and lower water absorption and drying shrinkage compared to the concrete with pre-sprayed RCA. A lower porosity and reduced number of microcracks are observed in pre-soaked RCA concrete compared to pre-sprayed RCA concrete. The results are promising and point that the treatment of the RCAs reduce their water absorption and, thereby improving mechanical and durability performance of the concrete.
{"title":"Effect of treatment method of recycled concrete aggregate by pristine graphene on mechanical and durability properties of concrete","authors":"A. Gholampour, Massoud Sofi, Youhong Tang","doi":"10.1680/jmacr.23.00213","DOIUrl":"https://doi.org/10.1680/jmacr.23.00213","url":null,"abstract":"Using recycled concrete aggregates (RCAs) in concrete has emerged as a promising approach to minimize the environmental impact associated with construction and demolition waste, while simultaneously enhance the sustainability of concrete. Enhancing the quality of RCAs is crucial to instill greater confidence among material suppliers and promote the systematic utilization of RCAs in the construction industry. This study presents the use of pristine graphene suspension at 0, 0.1 and 0.2% concentrations in water for improving properties of RCAs, thereby improving mechanical and durability properties of resulting concretes incorporating 100% RCA as coarse aggregates. For this investigation, two treatment methods, including pre-spraying and pre-soaking, were used to treat the RCAs. Nano-silica with the same concentration and treatment method was also utilized to compare the results. Various strength tests including axial compressive, splitting tensile and flexural were performed. In addition, material properties such as water absorption and drying shrinkage were assessed. Microanalysis using scanning electron microscopy (SEM) and micro-CT was also employed. It is shown that, for both treatment methods investigated and nanomaterial concentrations, pristine graphene is more effective than nano-silica in increasing the strength properties and reducing the water absorption and drying shrinkage due to a lower level of material porosity. It is also found that, for a given nanomaterial concentration and type, concrete with pre-soaked RCA exhibits higher strengths and lower water absorption and drying shrinkage compared to the concrete with pre-sprayed RCA. A lower porosity and reduced number of microcracks are observed in pre-soaked RCA concrete compared to pre-sprayed RCA concrete. The results are promising and point that the treatment of the RCAs reduce their water absorption and, thereby improving mechanical and durability performance of the concrete.","PeriodicalId":18113,"journal":{"name":"Magazine of Concrete Research","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2024-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139627055","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The aim of this work is to present a rheological assessment of mortars based on the automated slump test methodology. Was employed this equipment in order to monitor the transient and permanent regime of the slump test and its spread, correlating such parameters to rheological properties. Based on dimensionless slump/spread, yield stress and viscosity, were defined empirical models for obtaining rheological parameters, which provided correlations with an elevated coefficient of determination (R2 > 0.85). Through the analysis of the slump behavior of mortars, was able to define a correlation between the viscosity and the flow maximum slump velocity (R2 = 0.90), showing that the viscosity could be measured based on the slump velocity. Furthermore, with basis on a physical description of the slump test related to the Reynolds number, were defined three distinct stages in the slump process: the viscous (constituted by high viscosities), the intermediary (coexistence of viscous and inertial effects), and the inertial (characterized by low viscosities and a higher sensibility towards the lifting of the mold). Lastly, the dynamic similarity of the analyzed material (vertical and radial axes, Rez/Rer∼1) indicates that the shear rate can be measured based on the vertical direction of the flow (slump).
{"title":"Correlation between the automated slump test and the rheological properties of portland cement mortars","authors":"J. B. Pereira, G. Maciel","doi":"10.1680/jmacr.23.00150","DOIUrl":"https://doi.org/10.1680/jmacr.23.00150","url":null,"abstract":"The aim of this work is to present a rheological assessment of mortars based on the automated slump test methodology. Was employed this equipment in order to monitor the transient and permanent regime of the slump test and its spread, correlating such parameters to rheological properties. Based on dimensionless slump/spread, yield stress and viscosity, were defined empirical models for obtaining rheological parameters, which provided correlations with an elevated coefficient of determination (R2 > 0.85). Through the analysis of the slump behavior of mortars, was able to define a correlation between the viscosity and the flow maximum slump velocity (R2 = 0.90), showing that the viscosity could be measured based on the slump velocity. Furthermore, with basis on a physical description of the slump test related to the Reynolds number, were defined three distinct stages in the slump process: the viscous (constituted by high viscosities), the intermediary (coexistence of viscous and inertial effects), and the inertial (characterized by low viscosities and a higher sensibility towards the lifting of the mold). Lastly, the dynamic similarity of the analyzed material (vertical and radial axes, Rez/Rer∼1) indicates that the shear rate can be measured based on the vertical direction of the flow (slump).","PeriodicalId":18113,"journal":{"name":"Magazine of Concrete Research","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2024-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139625585","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-01DOI: 10.1680/jmacr.2024.76.2.108
{"title":"Award-winning paper in 2022","authors":"","doi":"10.1680/jmacr.2024.76.2.108","DOIUrl":"https://doi.org/10.1680/jmacr.2024.76.2.108","url":null,"abstract":"","PeriodicalId":18113,"journal":{"name":"Magazine of Concrete Research","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139128381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Reza Saghafi Lasemi, Masoud Ziaei, Mohammad Hadi Alizadeh Elizei, Reza Esmaeil Abadi
One of the recycling approaches of waste materials like tires and glass is to use them in concrete. In this paper, the effect of simultaneous use of waste rubber and glass powder, as partial substitution of fine aggregate and cement, on workability and mechanical properties in ambient temperature and after exposure to temperature of 600°C is investigated. In total, 13 mixtures were prepared. Except the reference mixture, the rest contained a combination of rubber particles replacing fine aggregate with the percentages of 5% and 10% by volume and glass powder replacing cement with percentages of 10%, 15% and 20%. First of all, the slump test was carried out. Moreover, compressive strength, tensile strength and ratio of tensile to compressive strength, before and after thermal exposure, and mass loss after exposure to elevated temperature were investigated. In order to have an understanding of waste materials behaviour, scanning electron microscopy and energy-dispersive X-ray spectroscopy tests were conducted. the results indicated that 5% for rubber particles, 10% for glass powder and also rubber particle size of 3-5mm presented the best results among mixtures containing rubber and glass powder, in terms of compressive and tensile strengths.
{"title":"Mechanical and thermal behavior of concrete including waste tire and glass powder as fine aggregate and cement respectively","authors":"Reza Saghafi Lasemi, Masoud Ziaei, Mohammad Hadi Alizadeh Elizei, Reza Esmaeil Abadi","doi":"10.1680/jmacr.23.00115","DOIUrl":"https://doi.org/10.1680/jmacr.23.00115","url":null,"abstract":"One of the recycling approaches of waste materials like tires and glass is to use them in concrete. In this paper, the effect of simultaneous use of waste rubber and glass powder, as partial substitution of fine aggregate and cement, on workability and mechanical properties in ambient temperature and after exposure to temperature of 600°C is investigated. In total, 13 mixtures were prepared. Except the reference mixture, the rest contained a combination of rubber particles replacing fine aggregate with the percentages of 5% and 10% by volume and glass powder replacing cement with percentages of 10%, 15% and 20%. First of all, the slump test was carried out. Moreover, compressive strength, tensile strength and ratio of tensile to compressive strength, before and after thermal exposure, and mass loss after exposure to elevated temperature were investigated. In order to have an understanding of waste materials behaviour, scanning electron microscopy and energy-dispersive X-ray spectroscopy tests were conducted. the results indicated that 5% for rubber particles, 10% for glass powder and also rubber particle size of 3-5mm presented the best results among mixtures containing rubber and glass powder, in terms of compressive and tensile strengths.","PeriodicalId":18113,"journal":{"name":"Magazine of Concrete Research","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2023-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139052727","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper provides a comprehensive overview of fracture propagation in concrete, covering various aspects ranging from fundamentals to applications and future directions. The introduction section presents an overview of fracture propagation in concrete, emphasising its importance in understanding the behaviour of concrete structures. The fundamentals of fracture propagation are explored, including concrete as a composite material, crack initiation and propagation mechanisms, types of fractures and factors influencing fracture propagation. Experimental techniques for studying fracture propagation are discussed, encompassing both non-destructive and destructive testing methods, such as acoustic emission, ultrasonic testing, digital image correlation and advanced imaging techniques like X-ray tomography and scanning electron microscopy. Modelling approaches, including continuum damage mechanics, finite element method, discrete element method, lattice discrete particle model and hybrid modelling approaches, are reviewed for simulating and predicting fracture propagation behaviour. The applications of fracture propagation in concrete are highlighted, including structural health monitoring, design optimisation, failure analysis and repair and rehabilitation strategies. The research opportunities for further improvement are addressed. The paper serves as a valuable resource for researchers, engineers and professionals in the field, providing a comprehensive understanding of fracture propagation in concrete and guiding future research endeavours.
本文全面概述了混凝土中的断裂扩展，涵盖了从基础到应用以及未来发展方向等各个方面。引言部分概述了混凝土中的断裂扩展，强调了其对理解混凝土结构行为的重要性。书中探讨了断裂扩展的基本原理，包括作为复合材料的混凝土、裂纹的产生和扩展机制、断裂类型以及影响断裂扩展的因素。还讨论了研究断裂扩展的实验技术，包括非破坏性和破坏性测试方法，如声发射、超声波测试、数字图像关联以及 X 射线断层扫描和扫描电子显微镜等先进成像技术。对模拟和预测断裂扩展行为的建模方法进行了综述，包括连续损伤力学、有限元法、离散元法、晶格离散粒子模型和混合建模方法。重点介绍了混凝土断裂扩展的应用，包括结构健康监测、设计优化、失效分析以及修复和复原策略。还探讨了进一步改进的研究机会。论文为该领域的研究人员、工程师和专业人士提供了宝贵的资源，使他们对混凝土断裂扩展有了全面的了解，并为未来的研究工作提供了指导。
{"title":"A review on fracture propagation in concrete: fundamentals, experimental techniques, modelling and applications","authors":"Salim Barbhuiya, Bibhuti Bhusan Das, Fragkoulis Kanavaris","doi":"10.1680/jmacr.23.00143","DOIUrl":"https://doi.org/10.1680/jmacr.23.00143","url":null,"abstract":"This paper provides a comprehensive overview of fracture propagation in concrete, covering various aspects ranging from fundamentals to applications and future directions. The introduction section presents an overview of fracture propagation in concrete, emphasising its importance in understanding the behaviour of concrete structures. The fundamentals of fracture propagation are explored, including concrete as a composite material, crack initiation and propagation mechanisms, types of fractures and factors influencing fracture propagation. Experimental techniques for studying fracture propagation are discussed, encompassing both non-destructive and destructive testing methods, such as acoustic emission, ultrasonic testing, digital image correlation and advanced imaging techniques like X-ray tomography and scanning electron microscopy. Modelling approaches, including continuum damage mechanics, finite element method, discrete element method, lattice discrete particle model and hybrid modelling approaches, are reviewed for simulating and predicting fracture propagation behaviour. The applications of fracture propagation in concrete are highlighted, including structural health monitoring, design optimisation, failure analysis and repair and rehabilitation strategies. The research opportunities for further improvement are addressed. The paper serves as a valuable resource for researchers, engineers and professionals in the field, providing a comprehensive understanding of fracture propagation in concrete and guiding future research endeavours.","PeriodicalId":18113,"journal":{"name":"Magazine of Concrete Research","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2023-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139052644","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Mizan Ahmed, Saad A. Yehia, Ramy I. Shahin, Mohamed Emara, Vipulkumar Ishvarbhai Patel, Qing Quan Liang
This paper presents a computational model for determining the axial responses of circular Steel-Reinforced Concrete-Filled Steel Tubular (SRCFST) short columns. A novel confinement model is formulated for the concrete-core that is effectively confined by the external circular steel tube and the embedded steel section. The modeling scheme of confinement is programmed in the mathematical model that utilizes the fiber element discretization of column cross-sections. The numerical predictions are verified by experimental measurements and results obtained from the finite element analysis, demonstrating the accuracy of the modeling technology. In addition, existing concrete confinement models for concrete in circular Concrete-Filled Steel Tubular (CFST) columns are assessed. The new confinement model is shown to be superior in replicating the responses of SRCFST columns. The influences of design parameters on the column's performance are numerically investigated and the importance order of these parameters is determined by a sensitivity analysis. The study not only examines the validity of current design standards in determining the axial load capacity of SRCFST columns but also proposes a new design formula. The proposed confinement model can be employed in numerical procedures for the inelastic simulation of SRCFST columns and the design formula is suitable for use in practical design.
{"title":"Numerical simulation and design of circular steel-reinforced concrete-filled steel tubular short columns under axial loading","authors":"Mizan Ahmed, Saad A. Yehia, Ramy I. Shahin, Mohamed Emara, Vipulkumar Ishvarbhai Patel, Qing Quan Liang","doi":"10.1680/jmacr.23.00153","DOIUrl":"https://doi.org/10.1680/jmacr.23.00153","url":null,"abstract":"This paper presents a computational model for determining the axial responses of circular Steel-Reinforced Concrete-Filled Steel Tubular (SRCFST) short columns. A novel confinement model is formulated for the concrete-core that is effectively confined by the external circular steel tube and the embedded steel section. The modeling scheme of confinement is programmed in the mathematical model that utilizes the fiber element discretization of column cross-sections. The numerical predictions are verified by experimental measurements and results obtained from the finite element analysis, demonstrating the accuracy of the modeling technology. In addition, existing concrete confinement models for concrete in circular Concrete-Filled Steel Tubular (CFST) columns are assessed. The new confinement model is shown to be superior in replicating the responses of SRCFST columns. The influences of design parameters on the column's performance are numerically investigated and the importance order of these parameters is determined by a sensitivity analysis. The study not only examines the validity of current design standards in determining the axial load capacity of SRCFST columns but also proposes a new design formula. The proposed confinement model can be employed in numerical procedures for the inelastic simulation of SRCFST columns and the design formula is suitable for use in practical design.","PeriodicalId":18113,"journal":{"name":"Magazine of Concrete Research","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2023-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138818579","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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