Pub Date : 2023-02-17DOI: 10.36937/cebel.2023.5790
Khashayar Asgarinia
The low strength of lightweight aggregates diminishes the strength of lightweight concrete, and the concrete's fragility impedes the ductile behavior of structures subjected to seismic stresses. The use of reinforcing materials and fibers may increase the strength of lightweight concrete by compensating for the impact of reduced strength caused by the use of lightweight particles and preventing the rapid breakdown of concrete. The performance of the materials used is an effective determinant of structural member behavior. Therefore, for computational analysis of finite elements to accurately anticipate the behavior of structural parts, precise behavioral models of materials are required. This study studied the tensile behavior of lightweight structural concrete containing steel fibers (at a volume percentage of 1%) and nanosilica reinforcing pozzolan (at a weight percentage of between 1 and 3%), using tensile strength as one of the influencing factors. together with the strain corresponding to the maximal stress. The inclusion of steel fibers and nanosilica had the largest influence on enhancing the tensile behavior of lightweight concrete, according to the data. By adding 3% nanosilica and 1% steel fibers to light concrete, the direct tensile strength has risen by 74%. In addition, the indirect tensile strength is somewhat greater in all samples than the direct tensile strength.
{"title":"The Effect of Nanosilica and Steel Fibers on The Mechanical Behavior of Structural Lightweight Concrete","authors":"Khashayar Asgarinia","doi":"10.36937/cebel.2023.5790","DOIUrl":"https://doi.org/10.36937/cebel.2023.5790","url":null,"abstract":"The low strength of lightweight aggregates diminishes the strength of lightweight concrete, and the concrete's fragility impedes the ductile behavior of structures subjected to seismic stresses. The use of reinforcing materials and fibers may increase the strength of lightweight concrete by compensating for the impact of reduced strength caused by the use of lightweight particles and preventing the rapid breakdown of concrete. The performance of the materials used is an effective determinant of structural member behavior. Therefore, for computational analysis of finite elements to accurately anticipate the behavior of structural parts, precise behavioral models of materials are required. This study studied the tensile behavior of lightweight structural concrete containing steel fibers (at a volume percentage of 1%) and nanosilica reinforcing pozzolan (at a weight percentage of between 1 and 3%), using tensile strength as one of the influencing factors. together with the strain corresponding to the maximal stress. The inclusion of steel fibers and nanosilica had the largest influence on enhancing the tensile behavior of lightweight concrete, according to the data. By adding 3% nanosilica and 1% steel fibers to light concrete, the direct tensile strength has risen by 74%. In addition, the indirect tensile strength is somewhat greater in all samples than the direct tensile strength.","PeriodicalId":343973,"journal":{"name":"Journal of Cement Based Composites","volume":"110 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124089547","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-17DOI: 10.36937/cebel.2023.5793
Khashayar Asgarinia
The engineering properties of high-strength concrete are significantly different from those of ordinary concrete, and as a result, this concrete has become popular in a variety of applications, including the construction industry, particularly for tall buildings, bridges with long spans, and precast members. Reinforcing high-strength concrete using fibers is a common method for increasing ductility without losing strength. In this study, steel fibers were employed to replace 1, 1.5, 2, and 2.5 percent of the total volume of concrete, and a total of 5 mixed designs were conceived and constructed. The findings showed that the addition of steel fibers up to 2% by volume boosted the compressive strength and decreased at 2.5% by volume. The incorporation of steel fibers has diminished the mixes' durability.
{"title":"Investigating The Mechanical Behavior of High-Strength Concrete Reinforced with Hooked Steel Fibers","authors":"Khashayar Asgarinia","doi":"10.36937/cebel.2023.5793","DOIUrl":"https://doi.org/10.36937/cebel.2023.5793","url":null,"abstract":"The engineering properties of high-strength concrete are significantly different from those of ordinary concrete, and as a result, this concrete has become popular in a variety of applications, including the construction industry, particularly for tall buildings, bridges with long spans, and precast members. Reinforcing high-strength concrete using fibers is a common method for increasing ductility without losing strength. In this study, steel fibers were employed to replace 1, 1.5, 2, and 2.5 percent of the total volume of concrete, and a total of 5 mixed designs were conceived and constructed. The findings showed that the addition of steel fibers up to 2% by volume boosted the compressive strength and decreased at 2.5% by volume. The incorporation of steel fibers has diminished the mixes' durability.","PeriodicalId":343973,"journal":{"name":"Journal of Cement Based Composites","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121857212","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-07DOI: 10.36937/cebacom.2023.5773
Göksu Pılsım
Lately, because of the pollution caused by cement production waste materials that can be used instead of cement aroused interest by researchers. Glass is one of these waste materials. Glasses due to their nonbiodegradable properties, cause serious environmental risks and recycling this waste material would minimize these environmental concerns. Therefore, finely granulated glass powders, due to their high silicious content are being used as pozzolanic admixture. In this study, glass powders are replaced with cement (by weight) at 0%, 5%, 10% and 15%. And mechanical and durability performances are investigated. Compressive and flexural strength, flow test, abrasion resistance, sulfate resistance and capillary water absorption test were conducted. Results indicated that an increase in glass powder dosage in cement mortars leads to decrease in mechanical properties.
{"title":"An Investigation of Cement Mortars Containing Glass Powder as A Partial Cement Replacement","authors":"Göksu Pılsım","doi":"10.36937/cebacom.2023.5773","DOIUrl":"https://doi.org/10.36937/cebacom.2023.5773","url":null,"abstract":"Lately, because of the pollution caused by cement production waste materials that can be used instead of cement aroused interest by researchers. Glass is one of these waste materials. Glasses due to their nonbiodegradable properties, cause serious environmental risks and recycling this waste material would minimize these environmental concerns. Therefore, finely granulated glass powders, due to their high silicious content are being used as pozzolanic admixture. In this study, glass powders are replaced with cement (by weight) at 0%, 5%, 10% and 15%. And mechanical and durability performances are investigated. Compressive and flexural strength, flow test, abrasion resistance, sulfate resistance and capillary water absorption test were conducted. Results indicated that an increase in glass powder dosage in cement mortars leads to decrease in mechanical properties.","PeriodicalId":343973,"journal":{"name":"Journal of Cement Based Composites","volume":"23 5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125687106","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-07DOI: 10.36937/cebacom.2023.5756
M. Tiza
In terms of the impact of human activity on the natural environment, civil engineering is one of the most significant productive pursuits. The production and use of building materials, the advancement of engineering and construction, the use of the project after it is completed, the removal of discarded components, and other procedures all require significant energy expenditure and ongoing waste generation, which can have severe consequences for the natural environment. To meet the demands of both economic and social development, advancements in civil engineering must be made while also protecting the natural world, limiting the use of natural resources, and promoting sustainable development. This study examines the long-term strategy in civil engineering and explores the role of environmental sustainability throughout the various stages of the civil design process, including the conceptual stage, the technical design stage, and the building stage. The research finds that the construction industry should adopt practices that adhere to sustainability principles such as environmentally-friendly design, durability, energy efficiency, waste reduction, improved indoor air quality, water conservation, and the use of sustainable building materials in construction.
{"title":"Integrating Sustainability into Civil Engineering and the Construction Industry","authors":"M. Tiza","doi":"10.36937/cebacom.2023.5756","DOIUrl":"https://doi.org/10.36937/cebacom.2023.5756","url":null,"abstract":"In terms of the impact of human activity on the natural environment, civil engineering is one of the most significant productive pursuits. The production and use of building materials, the advancement of engineering and construction, the use of the project after it is completed, the removal of discarded components, and other procedures all require significant energy expenditure and ongoing waste generation, which can have severe consequences for the natural environment. To meet the demands of both economic and social development, advancements in civil engineering must be made while also protecting the natural world, limiting the use of natural resources, and promoting sustainable development. This study examines the long-term strategy in civil engineering and explores the role of environmental sustainability throughout the various stages of the civil design process, including the conceptual stage, the technical design stage, and the building stage. The research finds that the construction industry should adopt practices that adhere to sustainability principles such as environmentally-friendly design, durability, energy efficiency, waste reduction, improved indoor air quality, water conservation, and the use of sustainable building materials in construction.","PeriodicalId":343973,"journal":{"name":"Journal of Cement Based Composites","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126700594","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-31DOI: 10.36937/cebacom.2022.5747
S. Nwaubani
Kaolin, also known as China clay, is one of the materials that can be used as partial replacement for Portland cement but most of the research has been focused on its dehydroxylated form (metakaolin). The lack of interest in raw kaolin clay as a cement replacement material is partly due to its negative impact on strength and the traditional perception that raw clay is detrimental to concrete. However, the use of raw kaolin clay as cement replacement may offer other benefits, such as energy saving and the potential to produce durable cement-based material at low cost. Therefore, this paper presents findings on the influence of raw kaolin clay on the properties and durability performance of Portland cement mortar in comparison with metakaolin, when used as partial substitute. The results show that the use of raw kaolin clay as a partial substitute for Portland cement improved all aspects of the durability properties investigated, which became more apparent with age. Despite having the lowest compressive strength, the raw kaolin clay mix displayed a lower porosity, better resistance to water absorption and finer pores than the control. In contrast to the raw kaolin clay, the metakaolin significantly enhanced both strength and durability. The results also reveal that at a given superplasticizer dosage and replacement level, the kaolin and metakaolin mixes exhibited the same consistency in the fresh state and a similar range of pore size distribution and total intrusion volume at 28 days. The findings further demonstrate that raw kaolin clay can be used as Portland cement replacement material to produce durable mortar and concrete, particularly for applications that do not require high strength.
{"title":"Influence of Raw Kaolin Clay and Its Dehydroxylated Form on The Properties and Performance of Portland Cement Mortar","authors":"S. Nwaubani","doi":"10.36937/cebacom.2022.5747","DOIUrl":"https://doi.org/10.36937/cebacom.2022.5747","url":null,"abstract":"Kaolin, also known as China clay, is one of the materials that can be used as partial replacement for Portland cement but most of the research has been focused on its dehydroxylated form (metakaolin). The lack of interest in raw kaolin clay as a cement replacement material is partly due to its negative impact on strength and the traditional perception that raw clay is detrimental to concrete. However, the use of raw kaolin clay as cement replacement may offer other benefits, such as energy saving and the potential to produce durable cement-based material at low cost. Therefore, this paper presents findings on the influence of raw kaolin clay on the properties and durability performance of Portland cement mortar in comparison with metakaolin, when used as partial substitute. The results show that the use of raw kaolin clay as a partial substitute for Portland cement improved all aspects of the durability properties investigated, which became more apparent with age. Despite having the lowest compressive strength, the raw kaolin clay mix displayed a lower porosity, better resistance to water absorption and finer pores than the control. In contrast to the raw kaolin clay, the metakaolin significantly enhanced both strength and durability. The results also reveal that at a given superplasticizer dosage and replacement level, the kaolin and metakaolin mixes exhibited the same consistency in the fresh state and a similar range of pore size distribution and total intrusion volume at 28 days. The findings further demonstrate that raw kaolin clay can be used as Portland cement replacement material to produce durable mortar and concrete, particularly for applications that do not require high strength.","PeriodicalId":343973,"journal":{"name":"Journal of Cement Based Composites","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131270187","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-02DOI: 10.36937/cebacom.2022.5724
Mia MD Kamal
The global economy depends on the building industry. Rapid building growth creates global worries about waste. Construction and demolition waste (CDW) negatively affect costs, energy, productivity, the environment, and society. Planning and storing building trash may reduce these harmful consequences. On local construction sites, waste, poor site management, and resource loss are common. The way a structure is built, how materials and equipment are transported, how employees behave, how a firm is handled, how the site is set up, and how resources are procured all contribute to construction waste, which in turn contributes significantly to the degradation of the environment due to indiscriminate disposals. This study takes a look at the mechanical properties of CDW while conducting the research, credible academic sources were located on Google Scholar, SCOPUS, the Web of Science, IEEE Xplore, and Science Direct. The publications were narrowed down to only those that were most relevant to the study's aims. After reviewing these, the authors focused on just the 49 journal articles, 15 related books, and 7 government publications that were most relevant to the research.
全球经济依赖于建筑业。建筑的快速增长引发了全球对浪费的担忧。建筑和拆迁垃圾(CDW)对成本、能源、生产力、环境和社会产生负面影响。规划和储存建筑垃圾可以减少这些有害的后果。在当地的建筑工地，浪费、现场管理不善和资源损失是常见的。建筑的建造方式、材料和设备的运输方式、员工的行为方式、公司的管理方式、场地的设置方式以及资源的获取方式都导致了建筑垃圾的产生，这反过来又导致了环境的恶化。本研究在进行研究时考察了CDW的力学特性，可靠的学术来源位于Google Scholar, SCOPUS, Web of Science, IEEE Xplore和Science Direct。这些出版物被缩小到那些与研究目标最相关的出版物。在回顾了这些之后，作者只关注了与研究最相关的49篇期刊文章、15本相关书籍和7份政府出版物。
{"title":"Effect of Construction Wastes as Coarse Aggregates in Cement Concrete: A Review","authors":"Mia MD Kamal","doi":"10.36937/cebacom.2022.5724","DOIUrl":"https://doi.org/10.36937/cebacom.2022.5724","url":null,"abstract":"The global economy depends on the building industry. Rapid building growth creates global worries about waste. Construction and demolition waste (CDW) negatively affect costs, energy, productivity, the environment, and society. Planning and storing building trash may reduce these harmful consequences. On local construction sites, waste, poor site management, and resource loss are common. The way a structure is built, how materials and equipment are transported, how employees behave, how a firm is handled, how the site is set up, and how resources are procured all contribute to construction waste, which in turn contributes significantly to the degradation of the environment due to indiscriminate disposals. This study takes a look at the mechanical properties of CDW while conducting the research, credible academic sources were located on Google Scholar, SCOPUS, the Web of Science, IEEE Xplore, and Science Direct. The publications were narrowed down to only those that were most relevant to the study's aims. After reviewing these, the authors focused on just the 49 journal articles, 15 related books, and 7 government publications that were most relevant to the research.","PeriodicalId":343973,"journal":{"name":"Journal of Cement Based Composites","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130671320","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-10-25DOI: 10.36937/cebacom.2022.5736
O. Amer
The vulnerability of steel reinforcement to corrosion is a severe problem affecting the overall performance and durability of concrete structures in aggressive environments. The interest in using alternative Glass fibre-reinforced polymer (GFRP) bars lies in their corrosion resistance and higher tensile strength-to-weight ratio. Nevertheless, experimental results on the seismic behaviour of GFRP-reinforced walls are scarce. This paper investigates the hysteretic performance of hybrid steel-GFRP reinforced concrete shear walls to provide valuable experimental evidence for such walls under seismic loading. Six RC shear walls with steel and GFRP reinforcement were tested under pseudo-static reversed-cyclic lateral load. Three shear walls were reinforced by GFRP bars as longitudinal and transversal reinforcement, and two walls were reinforced with hybrid GFRP-steel bars with different ratios of web reinforcement. A reference specimen, ordinary steel-RC shear walls, was also introduced to certify the capability of GFRP as reinforcement bars. The results indicated that the GFRP-reinforced concrete slender walls had a stable hysteretic response and slight residual drift up to failure. Lower residual deformations, higher displacement capacity, and increased lateral strength could be observed with the GFRP web reinforcement ratio increase. Moreover, the fundamental period of GFRP and hybrid GFRP-steel reinforced walls can reach more than twice its original value prior to failure.
{"title":"Hysteretic Performance of Hybrid GFRP-Steel Reinforced Concrete Shear Walls: An Experimental Investigation","authors":"O. Amer","doi":"10.36937/cebacom.2022.5736","DOIUrl":"https://doi.org/10.36937/cebacom.2022.5736","url":null,"abstract":"The vulnerability of steel reinforcement to corrosion is a severe problem affecting the overall performance and durability of concrete structures in aggressive environments. The interest in using alternative Glass fibre-reinforced polymer (GFRP) bars lies in their corrosion resistance and higher tensile strength-to-weight ratio. Nevertheless, experimental results on the seismic behaviour of GFRP-reinforced walls are scarce. This paper investigates the hysteretic performance of hybrid steel-GFRP reinforced concrete shear walls to provide valuable experimental evidence for such walls under seismic loading. Six RC shear walls with steel and GFRP reinforcement were tested under pseudo-static reversed-cyclic lateral load. Three shear walls were reinforced by GFRP bars as longitudinal and transversal reinforcement, and two walls were reinforced with hybrid GFRP-steel bars with different ratios of web reinforcement. A reference specimen, ordinary steel-RC shear walls, was also introduced to certify the capability of GFRP as reinforcement bars. The results indicated that the GFRP-reinforced concrete slender walls had a stable hysteretic response and slight residual drift up to failure. Lower residual deformations, higher displacement capacity, and increased lateral strength could be observed with the GFRP web reinforcement ratio increase. Moreover, the fundamental period of GFRP and hybrid GFRP-steel reinforced walls can reach more than twice its original value prior to failure.","PeriodicalId":343973,"journal":{"name":"Journal of Cement Based Composites","volume":"294 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117354825","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-02DOI: 10.36937/cebacom.2022.5676
M. Haque
Through the ancient time structural lightweight concrete has been used successfully all over the world due to having its pleasant property of reducing dead load of multi-storied buildings which is very much important for high rising structures. This research represents the experimental works on the structural lightweight concrete to observe the cost and the physical properties using jhama brick (also known as over burnt brick) chips as partial replacement of coarse aggregate. For producing C-35 grade concrete, jhama brick chips was used for the partial replacement of coarse aggregate by 0%, 5%, 10%, 15%, 20%, 25%, and 30% weight of coarse aggregate. For this purpose, 21 sets of cylinders (100 mm x 200 mm) were prepared. Slump tests were carried out for each mix in the fresh state and 3, 7 and 28 days of compressive strength tests were also performed in the hardened state. The 28-days compressive strength of concrete with 0%, 5%, 10%, 15%, 20%, 25%, and 30% replacement of jhama brick chips were 37.12, 36.37, 34.23, 33.01, 30.89, 30.50, and 21.98 MPa respectively. The unit weight of concrete with 0%, 5%, 10%, 15%, 20%, 25%, and 30% replacement of jhama brick chips after 28-days curing were found 2409.3, 2379.2, 2286.9, 2230.2, 2197.0, 2104.1, and 2094.9 kg/m3 respectively. According to ASTM C 330, the compressive strength of concrete with jhama brick chips up to 25% of coarse aggregate fulfilled its requirements.
从古至今，结构轻量化混凝土由于其降低多层建筑自重的优良性能，在世界范围内得到了成功的应用，这对高层建筑具有重要意义。本研究是对结构轻量化混凝土进行试验研究，以观察用焦化砖(也称为过烧砖)碎片部分替代粗集料的成本和物理性能。为生产C-35级混凝土，采用jhama砖屑，用0%、5%、10%、15%、20%、25%、30%重量的粗骨料部分替代粗骨料。为此，制备了21组圆柱体(100 mm x 200 mm)。在新鲜状态下进行了坍落度试验，在硬化状态下进行了3、7和28天的抗压强度试验。替换量为0%、5%、10%、15%、20%、25%、30%的碎块混凝土28天抗压强度分别为37.12、36.37、34.23、33.01、30.89、30.50、21.98 MPa。养护28 d后，砌块置换率为0%、5%、10%、15%、20%、25%、30%的混凝土单位重量分别为2409.3、2379.2、2286.9、2230.2、2197.0、2104.1、2094.9 kg/m3。根据ASTM C 330标准，含粗骨料25%的jhama砖片的混凝土抗压强度达到要求。
{"title":"Performance Evaluation of Structural Lightweight Concrete Using Jhama Brick as a Partial Replacement of Coarse Aggregate","authors":"M. Haque","doi":"10.36937/cebacom.2022.5676","DOIUrl":"https://doi.org/10.36937/cebacom.2022.5676","url":null,"abstract":"Through the ancient time structural lightweight concrete has been used successfully all over the world due to having its pleasant property of reducing dead load of multi-storied buildings which is very much important for high rising structures. This research represents the experimental works on the structural lightweight concrete to observe the cost and the physical properties using jhama brick (also known as over burnt brick) chips as partial replacement of coarse aggregate. For producing C-35 grade concrete, jhama brick chips was used for the partial replacement of coarse aggregate by 0%, 5%, 10%, 15%, 20%, 25%, and 30% weight of coarse aggregate. For this purpose, 21 sets of cylinders (100 mm x 200 mm) were prepared. Slump tests were carried out for each mix in the fresh state and 3, 7 and 28 days of compressive strength tests were also performed in the hardened state. The 28-days compressive strength of concrete with 0%, 5%, 10%, 15%, 20%, 25%, and 30% replacement of jhama brick chips were 37.12, 36.37, 34.23, 33.01, 30.89, 30.50, and 21.98 MPa respectively. The unit weight of concrete with 0%, 5%, 10%, 15%, 20%, 25%, and 30% replacement of jhama brick chips after 28-days curing were found 2409.3, 2379.2, 2286.9, 2230.2, 2197.0, 2104.1, and 2094.9 kg/m3 respectively. According to ASTM C 330, the compressive strength of concrete with jhama brick chips up to 25% of coarse aggregate fulfilled its requirements.","PeriodicalId":343973,"journal":{"name":"Journal of Cement Based Composites","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126660747","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-05-22DOI: 10.36937/cebacom.2022.5630
Rakesh Kumar
Reinforcement of cement concrete using a hybrid combination of fibers is one of the recent developments in the concrete composite. This study used a hybrid combination of micro polypropylene graded fiber (up to 6 mm in length) and macro hooked end steel fiber (60 mm in length). The polypropylene fiber was optimized targeting a 20-25% reduction in drying shrinkage and abrasion loss. The steel fiber dosage was optimized for an enhancement of 15-20% in the flexural strength in bending over a conventional pavement concrete. The hardened state properties relevant to pavement concrete such as strengths and durability in terms of abrasion loss and drying shrinkage were investigated. Additionally, flexural behaviour (toughness indices and residual strength factors) and impact resistance were also studied. A minimum improvement of 19% in flexural strength, and 12% in splitting tensile strength, but a reduction in compressive strength (≈ 10%) was noted. A significant reduction in drying shrinkage (53%) and abrasion loss (31%) were noticed for the hybrid fiber reinforced concrete composite (HyFRCC) mix in comparison with the control concrete. Further, a significant improvement up to 14 times in toughness indices, 66-74 units in residual strength factors, and up to 27 times in impact resistance for HyFRCC were encountered. The study finally suggests that a hybrid combination of polypropylene fiber (0.1%) and steel fiber (0.5%) can be used in the construction of a long-lasting, economical, and sustainable concrete pavement including concrete overlays such as bridge deck slabs and white topping pavements.
{"title":"Hybrid Fiber Reinforced Concrete Composite for Construction of Rigid Pavements","authors":"Rakesh Kumar","doi":"10.36937/cebacom.2022.5630","DOIUrl":"https://doi.org/10.36937/cebacom.2022.5630","url":null,"abstract":"Reinforcement of cement concrete using a hybrid combination of fibers is one of the recent developments in the concrete composite. This study used a hybrid combination of micro polypropylene graded fiber (up to 6 mm in length) and macro hooked end steel fiber (60 mm in length). The polypropylene fiber was optimized targeting a 20-25% reduction in drying shrinkage and abrasion loss. The steel fiber dosage was optimized for an enhancement of 15-20% in the flexural strength in bending over a conventional pavement concrete. The hardened state properties relevant to pavement concrete such as strengths and durability in terms of abrasion loss and drying shrinkage were investigated. Additionally, flexural behaviour (toughness indices and residual strength factors) and impact resistance were also studied. A minimum improvement of 19% in flexural strength, and 12% in splitting tensile strength, but a reduction in compressive strength (≈ 10%) was noted. A significant reduction in drying shrinkage (53%) and abrasion loss (31%) were noticed for the hybrid fiber reinforced concrete composite (HyFRCC) mix in comparison with the control concrete. Further, a significant improvement up to 14 times in toughness indices, 66-74 units in residual strength factors, and up to 27 times in impact resistance for HyFRCC were encountered. The study finally suggests that a hybrid combination of polypropylene fiber (0.1%) and steel fiber (0.5%) can be used in the construction of a long-lasting, economical, and sustainable concrete pavement including concrete overlays such as bridge deck slabs and white topping pavements.","PeriodicalId":343973,"journal":{"name":"Journal of Cement Based Composites","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114827971","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-05-22DOI: 10.36937/cebacom.2022.5627
S. M. M. Sahibulla
Currently, the focus of research is on biocement mortar and concrete. To lower the cement substance by up to 40%, lime, fly ash, metakaolin, and silica fume are utilised. The major purpose of this study was to see if adding pozzolanic materials to biocement mortar may increase its setting time, consistency, and compressive strength, as well as the interaction of these pozzolanic components with cement mortar and concrete. The pozzolanic particles by sieving interaction to affirm the uniform molecule size equivalent to 1 µm. The compressive strength, consistency, and final setting time were estimated after the fruitful maturing of concrete blocks for around 28 days. As indicated by Taguchi investigation, the exploratory arrangement Level 10 gives the general best position among other trial designs with the GRG of 0.805. Besides, the weight level of metakaolin straightforwardly impacts the general exhibition of concrete substantial shapes rather than silica smoke, lime, and fly debris particles. The affirmation concentrates on uncovered improvement in the dark social grade of 1.92%, which is equivalent to the high compressive strength of 51.285 MPa, consistency territory between 29.5 to 38.5, and final setting time is 525 min. the impact of different pozzolanic substances on the concrete's consistency and setting time. It uncovered that by supplanting the 40% normal Portland concrete (OPC) with bio concrete, the concrete's consistency improves and the level of pozzolanic materials comparative with the level of OPC can build the concrete consistency restricts and lessen the use of bio concrete with minimal expense.
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