This paper discusses on some experimental investigations on performance of concrete incorporated with fly ash as cement replacement material. The fly ash content was varied from 0.0% to 60.0% by weight of cement. Different concrete mixes were proportioned at constant binder content with different water-binder ratios. The influence of these parameters on the ability of concrete to withstand the impact of aggressive H2SO4 concentration in water solution. Three different concentrations of 1.0, 3.0 and 5.0% of H2SO4 in solution have been adopted to investigate the loss in strength and weight of concrete. Concrete immersed in concentrated H2SO4 solution showed significant deterioration and color change. The strength of concrete decreases with increase in H2SO4 concentration. As the concentration of H2SO4 increases the loss of weight of concrete increases. At low replacements of cement by fly ash, the losses in strength and weight have been observed to be significantly high. As the percentage of fly ash in cement increases, there has been significant improvement in the resistance of concrete against H2SO4 influence. The losses in strength and weight of concrete decrease high volume fly ash concrete mixes. With different combinations of cementitious material (cement plus fly ash = binder), water-binder ratio and concentration of H2SO4, the concretes produced using high volume fly ash improve their durability. High volume fly ash concrete seems to be an efficient material for developing high performing durable concretes.
{"title":"Durability of high volume fly ash concrete exposed to H2SO4 environment","authors":"M. Rao","doi":"10.21012/FC10.235415","DOIUrl":"https://doi.org/10.21012/FC10.235415","url":null,"abstract":"This paper discusses on some experimental investigations on performance of concrete incorporated with fly ash as cement replacement material. The fly ash content was varied from 0.0% to 60.0% by weight of cement. Different concrete mixes were proportioned at constant binder content with different water-binder ratios. The influence of these parameters on the ability of concrete to withstand the impact of aggressive H2SO4 concentration in water solution. Three different concentrations of 1.0, 3.0 and 5.0% of H2SO4 in solution have been adopted to investigate the loss in strength and weight of concrete. Concrete immersed in concentrated H2SO4 solution showed significant deterioration and color change. The strength of concrete decreases with increase in H2SO4 concentration. As the concentration of H2SO4 increases the loss of weight of concrete increases. At low replacements of cement by fly ash, the losses in strength and weight have been observed to be significantly high. As the percentage of fly ash in cement increases, there has been significant improvement in the resistance of concrete against H2SO4 influence. The losses in strength and weight of concrete decrease high volume fly ash concrete mixes. With different combinations of cementitious material (cement plus fly ash = binder), water-binder ratio and concentration of H2SO4, the concretes produced using high volume fly ash improve their durability. High volume fly ash concrete seems to be an efficient material for developing high performing durable concretes.","PeriodicalId":329531,"journal":{"name":"Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures","volume":"32 8","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114037094","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}
Performance of anchorage reinforcement under dynamic loads is important to ensure adequate safety and structural integrity with adequate ductility. In the end regions, load transfer mechanism is influenced by cyclic loads under overloads. Since anchorage bond and its mechanics under cyclic over loading are absent, an experimental study to investigate the influence of type of loading and lateral confinement have been performed. Anchorage bond in concrete with different lateral confinement by spiral reinforcement has been studied under cyclic loading. The bond length was 80mm in the middle of 150mm depth of concrete. Bar diameter of 25mm was embedded in 25 MPa strength concrete with spirals of 8mm diameter with pitch of 25mm, 50mm and 75mm was adopted. It has been observed that the strength of concrete and the level of lateral confinement showed significant influence on the mode of failure and bond stress. Pullout failure was observed under monotonic and cyclic loading under overload in confined concrete. Different failure modes have been observed depending on the influencing parameters. The life of reinforced concrete due to deterioration of anchorage bond in rebars under cyclic loading is significantly reduced by the accidental overloads. The early application of overloads lowers the bond strength and service life of reinforced concrete. Abhishek, P, Harekrishna Kumar, and G. Appa Rao
{"title":"Cyclic over loads on life of bond anchorages in reinforced concrete","authors":"P. Abhishek","doi":"10.21012/FC10.235422","DOIUrl":"https://doi.org/10.21012/FC10.235422","url":null,"abstract":"Performance of anchorage reinforcement under dynamic loads is important to ensure adequate safety and structural integrity with adequate ductility. In the end regions, load transfer mechanism is influenced by cyclic loads under overloads. Since anchorage bond and its mechanics under cyclic over loading are absent, an experimental study to investigate the influence of type of loading and lateral confinement have been performed. Anchorage bond in concrete with different lateral confinement by spiral reinforcement has been studied under cyclic loading. The bond length was 80mm in the middle of 150mm depth of concrete. Bar diameter of 25mm was embedded in 25 MPa strength concrete with spirals of 8mm diameter with pitch of 25mm, 50mm and 75mm was adopted. It has been observed that the strength of concrete and the level of lateral confinement showed significant influence on the mode of failure and bond stress. Pullout failure was observed under monotonic and cyclic loading under overload in confined concrete. Different failure modes have been observed depending on the influencing parameters. The life of reinforced concrete due to deterioration of anchorage bond in rebars under cyclic loading is significantly reduced by the accidental overloads. The early application of overloads lowers the bond strength and service life of reinforced concrete. Abhishek, P, Harekrishna Kumar, and G. Appa Rao","PeriodicalId":329531,"journal":{"name":"Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121668890","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}
Investigations on mechanical, elastic and performance of cement grout at different ages have been reported. The compressive strength of cement grout at the ages of 1 day, 3, 7, 28 and 90 days has been observed to be 40.10, 53.90, 60.30, 75.20 and 76.02 MPa respectively, while the corresponding flexural and direct tensile strengths are 6.1, 9.3, 9.6, 12.2, and 12.4 MPa, and 2.2, 3.15, 4.34, 6.02 and 6.49 MPa. The strength development in cement grout within 3 days has been observed to be excellent, while the strength development in 7 days is impressive. The strength development is normal up to 28 days and very negligible after 28 days. The direct shear strength of cement grout at 28 days is 3.6MPa. The bond strength of cement grout at 7 and 28 days have been observed to be 25.30 and 35.66 MPa respectively. The dynamic modulus of elasticity, quality and durability of cement grout have been found to be very well acceptable. Water absorption of cement grout is just 2.70%, which is well below limits. The anchorage bond strength of cement grout to be used for precast system has been observed to be extremely good in structures subjected to fatigue loading. The cement grout seems to be an excellent bonding material for various repair and precast concrete applications.
{"title":"Performance Characteristics of Cement Grout in Precast Construction","authors":"Appa Rao, G. A. K. Manikandan","doi":"10.21012/FC10.233507","DOIUrl":"https://doi.org/10.21012/FC10.233507","url":null,"abstract":"Investigations on mechanical, elastic and performance of cement grout at different ages have been reported. The compressive strength of cement grout at the ages of 1 day, 3, 7, 28 and 90 days has been observed to be 40.10, 53.90, 60.30, 75.20 and 76.02 MPa respectively, while the corresponding flexural and direct tensile strengths are 6.1, 9.3, 9.6, 12.2, and 12.4 MPa, and 2.2, 3.15, 4.34, 6.02 and 6.49 MPa. The strength development in cement grout within 3 days has been observed to be excellent, while the strength development in 7 days is impressive. The strength development is normal up to 28 days and very negligible after 28 days. The direct shear strength of cement grout at 28 days is 3.6MPa. The bond strength of cement grout at 7 and 28 days have been observed to be 25.30 and 35.66 MPa respectively. The dynamic modulus of elasticity, quality and durability of cement grout have been found to be very well acceptable. Water absorption of cement grout is just 2.70%, which is well below limits. The anchorage bond strength of cement grout to be used for precast system has been observed to be extremely good in structures subjected to fatigue loading. The cement grout seems to be an excellent bonding material for various repair and precast concrete applications.","PeriodicalId":329531,"journal":{"name":"Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116994277","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}
{"title":"Nonlinear behavior assessment of reinforced concrete frames by carbon fiber reinforced polymers under blast loading using finite element method","authors":"M. Kolbadi","doi":"10.21012/FC10.233505","DOIUrl":"https://doi.org/10.21012/FC10.233505","url":null,"abstract":"","PeriodicalId":329531,"journal":{"name":"Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117034224","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}
{"title":"Autogenous healing of fibre/matrix interface and its enhancement","authors":"J. Qiu","doi":"10.21012/FC10.233115","DOIUrl":"https://doi.org/10.21012/FC10.233115","url":null,"abstract":"","PeriodicalId":329531,"journal":{"name":"Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115316306","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}
{"title":"Dynamic fracture of concrete in compression: 3D FE analysis at macro and meso scale","authors":"S. Gambarelli","doi":"10.21012/FC10.234154","DOIUrl":"https://doi.org/10.21012/FC10.234154","url":null,"abstract":"","PeriodicalId":329531,"journal":{"name":"Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121170578","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}
Flavien Thierry, G. Rastiello, C. Giry, F. Gatuingt
The Eikonal Non-Local damage model (ENL) is an integral-based regularization method with damage-dependent non-local interactions. This contribution introduces the transition from an ENL formulation to a strong discontinuity model in a one-dimensional case. By introducing the formation of a cohesive crack in highly damaged areas, this new formulation seeks to solve problems of objectivity of results with respect to the mesh size for regularization methods with evolution of non-local interactions leading to strain localization.
{"title":"Damage-to-fracture transition through an Eikonal Non-Local (ENL) continuum damage formulation with embedded strong discontinuities","authors":"Flavien Thierry, G. Rastiello, C. Giry, F. Gatuingt","doi":"10.21012/FC10.233386","DOIUrl":"https://doi.org/10.21012/FC10.233386","url":null,"abstract":"The Eikonal Non-Local damage model (ENL) is an integral-based regularization method with damage-dependent non-local interactions. This contribution introduces the transition from an ENL formulation to a strong discontinuity model in a one-dimensional case. By introducing the formation of a cohesive crack in highly damaged areas, this new formulation seeks to solve problems of objectivity of results with respect to the mesh size for regularization methods with evolution of non-local interactions leading to strain localization.","PeriodicalId":329531,"journal":{"name":"Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121905711","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}
{"title":"A neural network ensemble for the identification of mechanical fracture parameters of Fine-grained Brittle Matrix Composites","authors":"D. Lehký","doi":"10.21012/FC10.234717","DOIUrl":"https://doi.org/10.21012/FC10.234717","url":null,"abstract":"","PeriodicalId":329531,"journal":{"name":"Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123721989","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}
{"title":"Investigations of size effect in concrete during splitting using DEM combined with X-Ray Micro-CT scans","authors":"J. Suchorzewski","doi":"10.21012/FC10.233583","DOIUrl":"https://doi.org/10.21012/FC10.233583","url":null,"abstract":"","PeriodicalId":329531,"journal":{"name":"Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124153491","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}
{"title":"A rate dependent eigenerosion plasticity model for concrete","authors":"A. Qinami","doi":"10.21012/FC10.234109","DOIUrl":"https://doi.org/10.21012/FC10.234109","url":null,"abstract":"","PeriodicalId":329531,"journal":{"name":"Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122369521","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}
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