To design the retrofit and/or conservation of existing reinforced concrete structures, an assessment of concrete strength is generally required. The current methodologies consist of destructive tests, based on uniaxial compression performed on concrete cores extracted from a structure, and/or non-destructive tests, in which the strength of the concrete is indirectly estimated by measuring other physical properties (like ultrasonic pulse velocity). Nevertheless, in several situations (e.g. the seismic vulnerability assessment of long-term service structures), the traditional tests cannot be performed. Hence, a new simplified approach is introduced and described in this paper. This can be applied to structures located in a precise geographical area, where the average strength of concrete (and the relative variance) is a function of the year of construction. Such a relationship is summarised by the so-called strength curves statistically computed from a huge database stored in the Department of Structural an...
{"title":"A simplified approach to the evaluation of the strength of old concrete","authors":"A. Fantilli, B. Frigo, B. Chiaia","doi":"10.1680/JCOMA.17.00010","DOIUrl":"https://doi.org/10.1680/JCOMA.17.00010","url":null,"abstract":"To design the retrofit and/or conservation of existing reinforced concrete structures, an assessment of concrete strength is generally required. The current methodologies consist of destructive tests, based on uniaxial compression performed on concrete cores extracted from a structure, and/or non-destructive tests, in which the strength of the concrete is indirectly estimated by measuring other physical properties (like ultrasonic pulse velocity). Nevertheless, in several situations (e.g. the seismic vulnerability assessment of long-term service structures), the traditional tests cannot be performed. Hence, a new simplified approach is introduced and described in this paper. This can be applied to structures located in a precise geographical area, where the average strength of concrete (and the relative variance) is a function of the year of construction. Such a relationship is summarised by the so-called strength curves statistically computed from a huge database stored in the Department of Structural an...","PeriodicalId":51787,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Construction Materials","volume":"9 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2018-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87115637","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}
F. Olutoge, C. Booth, S. Olawale, Olaolu A. Alebiosu
The compressive strengths of cement- and lime-stabilised lateritic bricks and blocks were investigated for economical construction in developing countries. Cement-stabilised lateritic blocks and br...
研究了发展中国家经济施工中水泥和石灰稳定红土砖和砌块的抗压强度。水泥稳定的红土块体和砖…
{"title":"Lateritic cement- and lime-stabilised bricks and blocks for affordable housing","authors":"F. Olutoge, C. Booth, S. Olawale, Olaolu A. Alebiosu","doi":"10.1680/JCOMA.16.00062","DOIUrl":"https://doi.org/10.1680/JCOMA.16.00062","url":null,"abstract":"The compressive strengths of cement- and lime-stabilised lateritic bricks and blocks were investigated for economical construction in developing countries. Cement-stabilised lateritic blocks and br...","PeriodicalId":51787,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Construction Materials","volume":"38 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2018-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75616907","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}
Recent study at the Council for Scientific and Industrial Research in South Africa has revealed the potential to substitute depleting natural aggregates with waste crushed glass in asphalt mixes. This paper presents an investigation of the use of crushed glass as an aggregate replacement in a conventional dense-graded asphalt wearing course commonly used on highways in South Africa. The objective of this study was to design a dense-graded hot-mix asphalt that utilises 15% of waste crushed glass as a substitute material for sand, and to compare its performance with a conventional dense-graded mix. The mix design was based on current South African methods. The overall results indicate that the glass asphalt mix meets the South African criteria, thus the mix design is acceptable. The optimum binder content of the glass asphalt mix was 5·1%, compared with 5·0% for the conventional dense-graded asphalt mix. Further investigation of the stiffness and rutting performance characteristics indicated that the asphal...
{"title":"Investigation of the use of waste crushed glass in the production of asphalt mixes","authors":"J. Anochie-Boateng, T. George","doi":"10.1680/JCOMA.16.00084","DOIUrl":"https://doi.org/10.1680/JCOMA.16.00084","url":null,"abstract":"Recent study at the Council for Scientific and Industrial Research in South Africa has revealed the potential to substitute depleting natural aggregates with waste crushed glass in asphalt mixes. This paper presents an investigation of the use of crushed glass as an aggregate replacement in a conventional dense-graded asphalt wearing course commonly used on highways in South Africa. The objective of this study was to design a dense-graded hot-mix asphalt that utilises 15% of waste crushed glass as a substitute material for sand, and to compare its performance with a conventional dense-graded mix. The mix design was based on current South African methods. The overall results indicate that the glass asphalt mix meets the South African criteria, thus the mix design is acceptable. The optimum binder content of the glass asphalt mix was 5·1%, compared with 5·0% for the conventional dense-graded asphalt mix. Further investigation of the stiffness and rutting performance characteristics indicated that the asphal...","PeriodicalId":51787,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Construction Materials","volume":"9 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2018-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82301956","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}
The risk of alkali–silica reaction of concrete aggregates in many parts of the world remains largely unexplored. In particular, a suitable approach for testing aggregates with marginal to moderate alkali–silica reactivity has not been clearly identified. In this study, the mineralogical compositions of aggregates from five different quarries were investigated. Mortar bar expansion for these aggregates was tested as per the guidelines of both C 227 and C 1260. Although the tested aggregate sources proved non-reactive under ASTM C 227 test conditions, ASTM C 260 identified one group of aggregates as potentially reactive. Scanning electron microscopy imaging confirmed that two sources of aggregates were reactive. The compressive and flexural strength test results of aged specimens with reactive aggregates indicated that the strength reduction of those subjected to 1 month of ASTM C 260 exposure was similar to those of specimens under 6 months of ASTM C 227 exposure. Based on the experimental results, it appe...
在世界上许多地方，混凝土集料的碱-硅反应的风险在很大程度上仍未被探索。特别是，一个合适的方法来测试与边际至中等碱-硅反应性聚集体还没有明确确定。在本研究中，研究了五个不同采石场的骨料的矿物学组成。根据c227和c1260的指导方针对这些骨料的砂浆棒膨胀进行了测试。尽管测试的骨料来源在ASTM C 227测试条件下证明无反应性，但ASTM C 260确定了一组骨料具有潜在的反应性。扫描电子显微镜成像证实两种来源的聚集体是反应性的。含活性骨料的老化试件抗压和抗弯强度试验结果表明，ASTM C 260暴露1个月的试件强度降低与ASTM C 227暴露6个月的试件强度降低相似。实验结果表明:
{"title":"Role of test method in detection of alkali–silica reactivity of concrete aggregates","authors":"M. Munir, S. Abbas, A. Qazi, M. Nehdi, S. Kazmi","doi":"10.1680/JCOMA.16.00058","DOIUrl":"https://doi.org/10.1680/JCOMA.16.00058","url":null,"abstract":"The risk of alkali–silica reaction of concrete aggregates in many parts of the world remains largely unexplored. In particular, a suitable approach for testing aggregates with marginal to moderate alkali–silica reactivity has not been clearly identified. In this study, the mineralogical compositions of aggregates from five different quarries were investigated. Mortar bar expansion for these aggregates was tested as per the guidelines of both C 227 and C 1260. Although the tested aggregate sources proved non-reactive under ASTM C 227 test conditions, ASTM C 260 identified one group of aggregates as potentially reactive. Scanning electron microscopy imaging confirmed that two sources of aggregates were reactive. The compressive and flexural strength test results of aged specimens with reactive aggregates indicated that the strength reduction of those subjected to 1 month of ASTM C 260 exposure was similar to those of specimens under 6 months of ASTM C 227 exposure. Based on the experimental results, it appe...","PeriodicalId":51787,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Construction Materials","volume":"38 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2018-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90942383","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}
K. Sahoo, Aparna K. Sathyan, P. Sarkar, Robin Davis
The construction industry uses cement, the production of which is heavy contributor to carbon dioxide (CO2) emissions and environmental damage. Any method that reduces the usage of cement could thu...
{"title":"Improvement of the mechanical properties of mortar and concrete using ureolytic bacteria","authors":"K. Sahoo, Aparna K. Sathyan, P. Sarkar, Robin Davis","doi":"10.1680/JCOMA.16.00022","DOIUrl":"https://doi.org/10.1680/JCOMA.16.00022","url":null,"abstract":"The construction industry uses cement, the production of which is heavy contributor to carbon dioxide (CO2) emissions and environmental damage. Any method that reduces the usage of cement could thu...","PeriodicalId":51787,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Construction Materials","volume":"2 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2018-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88886799","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}
John R. Williams, G. Sawyer, S. Cragg, J. Icely, J. Simm, M. Meaden, L. Borges, Graham P. Malyon
Naturally durable species of timber are used as an alternative to preservative-treated timber for marine structures, but many species have not been evaluated for their potential for use in this env...
{"title":"Evaluating less-used timber species for marine construction","authors":"John R. Williams, G. Sawyer, S. Cragg, J. Icely, J. Simm, M. Meaden, L. Borges, Graham P. Malyon","doi":"10.1680/JCOMA.15.00065","DOIUrl":"https://doi.org/10.1680/JCOMA.15.00065","url":null,"abstract":"Naturally durable species of timber are used as an alternative to preservative-treated timber for marine structures, but many species have not been evaluated for their potential for use in this env...","PeriodicalId":51787,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Construction Materials","volume":"9 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2018-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72730882","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}
This paper presents the bond characteristics of sand-coated, glass-fibre-reinforced polymer bars in ultra-high-strength concrete. A total of 216 pullout specimens were tested with variable parameters: bar diameters of 15·9 and 19·1 mm; bar embedment lengths of three, five and seven times the bar diameter; standard and high bar moduli; and concrete strengths of 129, 145 and 175 MPa. The influences of these parameters on bond strength, load–slip characteristics and failure modes are described. The bond stresses predicted from various North American codes are compared with those obtained from experiments.
{"title":"The bond between glass-fibre-reinforced polymer bars and ultra-high-strength concrete","authors":"K. Hossain, D. Ametrano, M. Lachemi","doi":"10.1680/JCOMA.16.00032","DOIUrl":"https://doi.org/10.1680/JCOMA.16.00032","url":null,"abstract":"This paper presents the bond characteristics of sand-coated, glass-fibre-reinforced polymer bars in ultra-high-strength concrete. A total of 216 pullout specimens were tested with variable parameters: bar diameters of 15·9 and 19·1 mm; bar embedment lengths of three, five and seven times the bar diameter; standard and high bar moduli; and concrete strengths of 129, 145 and 175 MPa. The influences of these parameters on bond strength, load–slip characteristics and failure modes are described. The bond stresses predicted from various North American codes are compared with those obtained from experiments.","PeriodicalId":51787,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Construction Materials","volume":"34 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2018-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74616452","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}
Zengfeng Zhao, S. Rémond, D. Damidot, L. Courard, F. Michel
Large amounts of construction and demolition wastes, especially concrete wastes, are generated annually. Until now, only a small fraction of concrete wastes has been reused as recycled concrete agg...
{"title":"Improving the properties of recycled concrete aggregates by accelerated carbonation","authors":"Zengfeng Zhao, S. Rémond, D. Damidot, L. Courard, F. Michel","doi":"10.1680/JCOMA.17.00015","DOIUrl":"https://doi.org/10.1680/JCOMA.17.00015","url":null,"abstract":"Large amounts of construction and demolition wastes, especially concrete wastes, are generated annually. Until now, only a small fraction of concrete wastes has been reused as recycled concrete agg...","PeriodicalId":51787,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Construction Materials","volume":"28 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84367078","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}
M. Kheradmand, M. Azenha, João Castro-Gomes, J. Aguiar
This paper reports an experimental study regarding the energy-saving potential of an innovative concept of thermal energy storage, which consists of embedding three types of phase-change material (...
本文报道了一项关于储能创新概念的节能潜力的实验研究，该概念包括嵌入三种相变材料(…
{"title":"Energy benefits of cement-based plaster containing hybrid phase-change material","authors":"M. Kheradmand, M. Azenha, João Castro-Gomes, J. Aguiar","doi":"10.1680/JCOMA.17.00027","DOIUrl":"https://doi.org/10.1680/JCOMA.17.00027","url":null,"abstract":"This paper reports an experimental study regarding the energy-saving potential of an innovative concept of thermal energy storage, which consists of embedding three types of phase-change material (...","PeriodicalId":51787,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Construction Materials","volume":"83 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2018-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89590945","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}
Incorporating solid waste materials in concrete has three advantages – the immediate environmental benefit of recycling a material from landfills, reducing the negative impact of cement production ...
在混凝土中掺入固体废物有三个优点——从垃圾填埋场回收材料的直接环境效益，减少水泥生产的负面影响……
{"title":"Ceramic waste powder: from landfill to sustainable concretes","authors":"A. El-Dieb, M. Taha, Dima M. Kanaan, S. Aly","doi":"10.1680/JCOMA.17.00019","DOIUrl":"https://doi.org/10.1680/JCOMA.17.00019","url":null,"abstract":"Incorporating solid waste materials in concrete has three advantages – the immediate environmental benefit of recycling a material from landfills, reducing the negative impact of cement production ...","PeriodicalId":51787,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Construction Materials","volume":"25 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2017-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82968464","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：