This study develops a novel graphene oxide (GO) coated polyethylene (PE) fiber which can be used to fabricate Strain-Hardening Cementitious Composites (SHCC). PE fiber can be covered by the GO due to the different thermal expansion behavior. This layer of GO coating would increase the fiber surface wettability and roughness, and also chemically improves the functionality and reactivity of PE fiber. Therefore, the interfacial bond between fiber and matrix can be improved. Since the bond between pristine PE fiber and cementitious matrix is usually too weak, theoretically the tensile performance of PE-SHCC after GO coating on the PE fiber (GO/PE-SHCC) can be improved if the fiber/matrix bond is strengthened. From the experimental results, it indicates that the tensile strain capacity of SHCC using 2 vol.% GO/PE fiber can be improved by 96.62 % (from 3.5% to 6.4%), compared to pristine PE-SHCC. The enhanced interfacial bond between fiber and matrix after GO coating is also confirmed by conducting the single fiber pullout test, which indicates that the peak pullout load can be improved by 45.16% (from 0.62N to 0.90N). These single fiber pullout results are further input into a micromechanical based model to generate the single crack fiber bridging law, and the potential of multiple cracking and robustness of strainhardening behavior is then evaluated by the model, which predicts GO/PE-SHCC should have better performance than pristine PE-SHCC. In conclusion, the research outcomes provide an effective strategy to strengthen the interfacial bond between PE fiber and matrix through GO coating, leading to the development of a novel SHCC with the strain up to 6 %.
{"title":"The effect of graphene oxide coating on the performance of SHCC","authors":"J. Yao, Z. Lu, C. Leung","doi":"10.21012/FC10.232842","DOIUrl":"https://doi.org/10.21012/FC10.232842","url":null,"abstract":"This study develops a novel graphene oxide (GO) coated polyethylene (PE) fiber which can be used to fabricate Strain-Hardening Cementitious Composites (SHCC). PE fiber can be covered by the GO due to the different thermal expansion behavior. This layer of GO coating would increase the fiber surface wettability and roughness, and also chemically improves the functionality and reactivity of PE fiber. Therefore, the interfacial bond between fiber and matrix can be improved. Since the bond between pristine PE fiber and cementitious matrix is usually too weak, theoretically the tensile performance of PE-SHCC after GO coating on the PE fiber (GO/PE-SHCC) can be improved if the fiber/matrix bond is strengthened. From the experimental results, it indicates that the tensile strain capacity of SHCC using 2 vol.% GO/PE fiber can be improved by 96.62 % (from 3.5% to 6.4%), compared to pristine PE-SHCC. The enhanced interfacial bond between fiber and matrix after GO coating is also confirmed by conducting the single fiber pullout test, which indicates that the peak pullout load can be improved by 45.16% (from 0.62N to 0.90N). These single fiber pullout results are further input into a micromechanical based model to generate the single crack fiber bridging law, and the potential of multiple cracking and robustness of strainhardening behavior is then evaluated by the model, which predicts GO/PE-SHCC should have better performance than pristine PE-SHCC. In conclusion, the research outcomes provide an effective strategy to strengthen the interfacial bond between PE fiber and matrix through GO coating, leading to the development of a novel SHCC with the strain up to 6 %.","PeriodicalId":329531,"journal":{"name":"Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures","volume":"105 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":"126663924","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}
Climate change is likely to increase the occurrence of extreme weather events. Thus, concrete pavements will likely be subjected more frequently to hail showers within their service life. Their influence on the structural behavior of the pavements is studied by means of thermoelastic multiscale analysis. Firstly, the stiffness and the thermal expansion coefficient of concrete are homogenized by means of a multiscale thermoporoelastic model, based on knowledge of the microstructural composition and the properties of the microstructural constituents. The quantified thermoelastic properties serve as input for macroscopic structural analysis of a concrete pavement subjected to thermomechanical loading. It delivers the temperature fields and macroscopic stress and strain states of the concrete. Finally, top-down scale transition is used to quantify the average microstresses of the cement paste and the aggregates.
{"title":"Thermoelastic multiscale analysis of concrete pavements subjected to hail showers","authors":"H. Wang","doi":"10.21012/FC10.235667","DOIUrl":"https://doi.org/10.21012/FC10.235667","url":null,"abstract":"Climate change is likely to increase the occurrence of extreme weather events. Thus, concrete pavements will likely be subjected more frequently to hail showers within their service life. Their influence on the structural behavior of the pavements is studied by means of thermoelastic multiscale analysis. Firstly, the stiffness and the thermal expansion coefficient of concrete are homogenized by means of a multiscale thermoporoelastic model, based on knowledge of the microstructural composition and the properties of the microstructural constituents. The quantified thermoelastic properties serve as input for macroscopic structural analysis of a concrete pavement subjected to thermomechanical loading. It delivers the temperature fields and macroscopic stress and strain states of the concrete. Finally, top-down scale transition is used to quantify the average microstresses of the cement paste and the aggregates.","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":"123362707","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":"Mineral-bonded composites for enhanced structural impact safety - Overview of the format, goals and achievements of the research group GRK 2250","authors":"I. Curosu","doi":"10.21012/FC10.235408","DOIUrl":"https://doi.org/10.21012/FC10.235408","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":"121476750","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}
T. Nguyen, J. Yvonnet, M. Bornert, C. Chateau, Qhizhi Zhu
In this work, we propose a phase field method for crack nucleation and propagation in highly concrete microstructural models obtained from microtomography images, thus consisting into fine, regular grids of voxels, each converted into a single element. In that context, crack nucleation and propagation is a very challenging problem, due to the discrete description of heterogeneities, and the presence of a very large number of inclusions and pores with arbitrary shapes. To avoid numerical issues related to explicitly describe discontinuities in such models, a phase field method is adopted [1]. An accelerated scheme is proposed by using a modified projection operator for computing the traction/compression split of the strains. Phase field models for fracture employ a continuous field of variables to describe cracks. The width of the transition zone between cracked and uncracked areas on a small length scale is controlled by a regularization parameter. Phase-field description, based on the Griffith theory [2] of brittle fracture and the variational approach to fracture mechanics proposed by B. Bourdin, et al. (2008) [3], does not require numerical tracking of discontinuities in the displacement field, and allows to greatly reduce computational complexity. We illustrate the methodology through several numerical examples involving crack nucleation and propagation in microtomography-based concrete models and other complex microstructures in two and three dimensions.
{"title":"Phase field method for microcracking simulations in concrete microstructure models obtained from 3D microtomography images","authors":"T. Nguyen, J. Yvonnet, M. Bornert, C. Chateau, Qhizhi Zhu","doi":"10.21012/FC10.233759","DOIUrl":"https://doi.org/10.21012/FC10.233759","url":null,"abstract":"In this work, we propose a phase field method for crack nucleation and propagation in highly concrete microstructural models obtained from microtomography images, thus consisting into fine, regular grids of voxels, each converted into a single element. In that context, crack nucleation and propagation is a very challenging problem, due to the discrete description of heterogeneities, and the presence of a very large number of inclusions and pores with arbitrary shapes. To avoid numerical issues related to explicitly describe discontinuities in such models, a phase field method is adopted [1]. An accelerated scheme is proposed by using a modified projection operator for computing the traction/compression split of the strains. Phase field models for fracture employ a continuous field of variables to describe cracks. The width of the transition zone between cracked and uncracked areas on a small length scale is controlled by a regularization parameter. Phase-field description, based on the Griffith theory [2] of brittle fracture and the variational approach to fracture mechanics proposed by B. Bourdin, et al. (2008) [3], does not require numerical tracking of discontinuities in the displacement field, and allows to greatly reduce computational complexity. We illustrate the methodology through several numerical examples involving crack nucleation and propagation in microtomography-based concrete models and other complex microstructures in two and three dimensions.","PeriodicalId":329531,"journal":{"name":"Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures","volume":"52 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":"121664014","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 study on the fracture of reinforced concrete beams under shear using the AE technique","authors":"M. Prashant","doi":"10.21012/FC10.234110","DOIUrl":"https://doi.org/10.21012/FC10.234110","url":null,"abstract":"","PeriodicalId":329531,"journal":{"name":"Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures","volume":"11 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":"134520124","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 work focuses on the coupling of the self-healing chemical reactions with the reactive flow in unsaturated concrete materials, using the carbonation of Ca(OH)2 as a prototype reaction model. The multi-component flow model couples the concentration of the reactant (Ca(OH)2) and external triggers (moisture and CO2) with the local remodeling of the matrix based on linear dissolution and precipitation reaction kinetics. The model reproduces the main features of the carbonation reaction and predicts the decrease in matrix porosity due to the self-healing mechanism.
{"title":"Modelling the carbonation reactions in self-healing concrete","authors":"E. Javierre","doi":"10.21012/FC10.235637","DOIUrl":"https://doi.org/10.21012/FC10.235637","url":null,"abstract":"This work focuses on the coupling of the self-healing chemical reactions with the reactive flow in unsaturated concrete materials, using the carbonation of Ca(OH)2 as a prototype reaction model. The multi-component flow model couples the concentration of the reactant (Ca(OH)2) and external triggers (moisture and CO2) with the local remodeling of the matrix based on linear dissolution and precipitation reaction kinetics. The model reproduces the main features of the carbonation reaction and predicts the decrease in matrix porosity due to the self-healing mechanism.","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":"131517284","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}
Self-healing of cracks by continuous hydration of unhydrated cement particles provide an improvement of mechanical properties for cementitious materials. Recent studies indicate that concrete specimens subjected to a sustained mechanical load lead to a variability of the mechanical properties recovery during self-healing. In fact, the presence of sustained mechanical load inset the creep deformations of concrete. In this paper, a numerical model based on the coupling of the microstructural hydration code CemPP and the finite element code Cast3M was performed to describe the mechanism of creep for healed structures. Numerical simulations have been carried out to determine the mechanical regains of cement paste cracked at 48 hours and then subjected to ongoing hydration process. After this first step, the viscoelastic creep behavior was investigated by applying a tensile creep load equal to 40% of tensile strength for each healed microstructure.
{"title":"Modelling of creep effect on a healed crack in cementitious materials","authors":"C. Namnoum","doi":"10.21012/FC10.235563","DOIUrl":"https://doi.org/10.21012/FC10.235563","url":null,"abstract":"Self-healing of cracks by continuous hydration of unhydrated cement particles provide an improvement of mechanical properties for cementitious materials. Recent studies indicate that concrete specimens subjected to a sustained mechanical load lead to a variability of the mechanical properties recovery during self-healing. In fact, the presence of sustained mechanical load inset the creep deformations of concrete. In this paper, a numerical model based on the coupling of the microstructural hydration code CemPP and the finite element code Cast3M was performed to describe the mechanism of creep for healed structures. Numerical simulations have been carried out to determine the mechanical regains of cement paste cracked at 48 hours and then subjected to ongoing hydration process. After this first step, the viscoelastic creep behavior was investigated by applying a tensile creep load equal to 40% of tensile strength for each healed microstructure.","PeriodicalId":329531,"journal":{"name":"Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures","volume":"2 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":"130807279","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}
. In this work, we investigate the elementary processes of brittle failure initiation with molecular simulation techniques. Failure initiation theories aim at bridging the gap between energy-driven failure at high stress concentrations and stress-driven failure in absence of stress concentration, and thus capturing the transition at moderate stress concentrations and associated scale effects. We study graphene, which is one of the few materials with a sufficiently small characteristic length (ratio between toughness and strength) to be addressed by molecular simulations. We also consider a toy model that proves helpful for physical interpretations. Performing molecular simulations of pre-cracked graphene, we found that its failure behavior can overcome both strength and toughness in situations of very high or low stress concentrations, respectively; which is consistent with one particular theory, namely Finite Fracture Mechanics (FFM), which considers failure initiation as the nucleation of a crack over a finite length. Details of the atomic mechanisms of failure are investigated in the athermal limit (0K). In this limit, failure initiates as an instability (negative eigenvalue of the Hessian matrix), irrespective of the stress concentration. However, the atomic mechanisms of failure and their degeneracy (eigenvector of the negative eigenvalue) strongly depend on stress concentration and points to the nucleation of a deformation band whose length decreases with stress concentration. This atomic description is quite similar to FFM theory. At finite temperature, failure is no more deterministic because of thermal agitation. An extensive study to characterize the effects of temperature,
{"title":"Fundamentals of brittle failure at the atomic scale","authors":"L. Brochard","doi":"10.21012/FC10.235517","DOIUrl":"https://doi.org/10.21012/FC10.235517","url":null,"abstract":". In this work, we investigate the elementary processes of brittle failure initiation with molecular simulation techniques. Failure initiation theories aim at bridging the gap between energy-driven failure at high stress concentrations and stress-driven failure in absence of stress concentration, and thus capturing the transition at moderate stress concentrations and associated scale effects. We study graphene, which is one of the few materials with a sufficiently small characteristic length (ratio between toughness and strength) to be addressed by molecular simulations. We also consider a toy model that proves helpful for physical interpretations. Performing molecular simulations of pre-cracked graphene, we found that its failure behavior can overcome both strength and toughness in situations of very high or low stress concentrations, respectively; which is consistent with one particular theory, namely Finite Fracture Mechanics (FFM), which considers failure initiation as the nucleation of a crack over a finite length. Details of the atomic mechanisms of failure are investigated in the athermal limit (0K). In this limit, failure initiates as an instability (negative eigenvalue of the Hessian matrix), irrespective of the stress concentration. However, the atomic mechanisms of failure and their degeneracy (eigenvector of the negative eigenvalue) strongly depend on stress concentration and points to the nucleation of a deformation band whose length decreases with stress concentration. This atomic description is quite similar to FFM theory. At finite temperature, failure is no more deterministic because of thermal agitation. An extensive study to characterize the effects of temperature,","PeriodicalId":329531,"journal":{"name":"Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures","volume":"57 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":"132584752","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}
Newly-developed composites that employ cementitious, i.e. inorganic, matrices have gained a momentum in the last decade in an attempt to overcome some drawbacks related to fiberreinforced polymer (FRP) composites. This broad category of composites is referred to in the literature as fiber-reinforced cementitious matrix (FRCM) composites or textile reinforced mortar (TRM) composites. The premature debonding of FRCM composites remains a critical issue as it is for FRPs and the phenomenon is even more complex than what observed in FRP materials because a hierarchy of interfaces exists as the fibers might debond from the inorganic matrix as well as the entire composite might debond from the substrate. This paper is a preliminary study that aims at investigating the feasibility of employing optical fibers to measure the strain in the fibers of the FRCM system. The research focuses on one FRCM that is comprised of a cement-based mortar and steel fibers. FRCM strips are bonded to concrete to study their bond behavior using a single-lap shear setup. The readings of the optical fibers are compared with the experimental strain derived from the applied load to understand if optical fibers can be used to understand the stress transfer between the steel fibers and the matrix.
{"title":"Interfacial Fracture Properties of FRCM Composites Bonded to a Quasi-Brittle Material","authors":"C. Carloni","doi":"10.21012/FC10.238516","DOIUrl":"https://doi.org/10.21012/FC10.238516","url":null,"abstract":"Newly-developed composites that employ cementitious, i.e. inorganic, matrices have gained a momentum in the last decade in an attempt to overcome some drawbacks related to fiberreinforced polymer (FRP) composites. This broad category of composites is referred to in the literature as fiber-reinforced cementitious matrix (FRCM) composites or textile reinforced mortar (TRM) composites. The premature debonding of FRCM composites remains a critical issue as it is for FRPs and the phenomenon is even more complex than what observed in FRP materials because a hierarchy of interfaces exists as the fibers might debond from the inorganic matrix as well as the entire composite might debond from the substrate. This paper is a preliminary study that aims at investigating the feasibility of employing optical fibers to measure the strain in the fibers of the FRCM system. The research focuses on one FRCM that is comprised of a cement-based mortar and steel fibers. FRCM strips are bonded to concrete to study their bond behavior using a single-lap shear setup. The readings of the optical fibers are compared with the experimental strain derived from the applied load to understand if optical fibers can be used to understand the stress transfer between the steel fibers and the matrix.","PeriodicalId":329531,"journal":{"name":"Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures","volume":"9 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":"115514465","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 is mainly concerned with the determination of fracture parameters of coral aggregate concrete (CAC) under different curing ages and conditions by virtue of three-pointbending tests. Four groups of CAC are tested. The first ones were cured for 56 days under standard environment and the second ones were immersed in seawater for 28 days after 28-day curing under standard environment. The third ones were cured for 118 days under standard environment and the fourth ones were immersed in seawater for 90 days after 28-day curing under standard environment. The initial crack length-to-beam depth ratios are set from 0.1 to 0.7 in each group. Results show that the failure modes of all the specimens are coral aggregate fracture without interfacial debonding between the aggregate and surrounding mortar. The maximum fracture load increases with the curing age. Besides, the beams cured by immersion in seawater have higher maximum facture loads compared to those cured under standard environment. Moreover, an analytical approach is proposed to determine the fracture parameters of CAC. The size-independent tensile strength and fracture toughness are obtained based on the boundary effect model by virtue of the experimentally determined maximum fracture loads. The analytically predicted maximum fracture loads are given related to the local fracture energy at the crack-tip region. The local fracture energy distribution and size-independent fracture energy can be obtained by the comparison between the analytical and experimental maximum fracture loads. It is found that the tensile strength increases with the curing age and becomes larger if the specimens were immersed in seawater for curing. But both the fracture toughness and fracture energy seem insensitive to the curing ages and conditions.
{"title":"Determination of fracture parameters of coral aggregate concrete after immersion in seawater","authors":"S. Yang","doi":"10.21012/FC10.235577","DOIUrl":"https://doi.org/10.21012/FC10.235577","url":null,"abstract":"This paper is mainly concerned with the determination of fracture parameters of coral aggregate concrete (CAC) under different curing ages and conditions by virtue of three-pointbending tests. Four groups of CAC are tested. The first ones were cured for 56 days under standard environment and the second ones were immersed in seawater for 28 days after 28-day curing under standard environment. The third ones were cured for 118 days under standard environment and the fourth ones were immersed in seawater for 90 days after 28-day curing under standard environment. The initial crack length-to-beam depth ratios are set from 0.1 to 0.7 in each group. Results show that the failure modes of all the specimens are coral aggregate fracture without interfacial debonding between the aggregate and surrounding mortar. The maximum fracture load increases with the curing age. Besides, the beams cured by immersion in seawater have higher maximum facture loads compared to those cured under standard environment. Moreover, an analytical approach is proposed to determine the fracture parameters of CAC. The size-independent tensile strength and fracture toughness are obtained based on the boundary effect model by virtue of the experimentally determined maximum fracture loads. The analytically predicted maximum fracture loads are given related to the local fracture energy at the crack-tip region. The local fracture energy distribution and size-independent fracture energy can be obtained by the comparison between the analytical and experimental maximum fracture loads. It is found that the tensile strength increases with the curing age and becomes larger if the specimens were immersed in seawater for curing. But both the fracture toughness and fracture energy seem insensitive to the curing ages and conditions.","PeriodicalId":329531,"journal":{"name":"Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures","volume":"12 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":"116023006","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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