{"title":"The Development of Mesoscopic Structural Analysis for Mechanical Property Reduction of Concrete Damaged by Expansion Cracking due to ASR","authors":"T. Miura","doi":"10.21012/FC10.235647","DOIUrl":"https://doi.org/10.21012/FC10.235647","url":null,"abstract":"","PeriodicalId":329531,"journal":{"name":"Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures","volume":"173 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":"132846697","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. D. Smedt, K. D. Wilder, L. Vandewalle, Els, Verstrynge
This paper presents the experimental study of monotonic and cyclic behaviour of steel fibre reinforced concrete (SFRC), based on Acoustic Emission (AE) monitoring. Two research scales, namely fibre pull-out tests and bending tests on SFRC, are subjected to monotonic and cyclic loading, combined with AE measurements. In general, the use of non-destructive testing methods leads to a better understanding of the material’s behaviour, compared to traditional test setups. The different stages during pull-out and bending, and the corresponding energy dissipation mechanisms, are detected by AE activity and the occurring damage can be localised. Furthermore, upscaling of AE monitoring detects the propagation of damage and its failure modes. It is shown that AE activity, displacement rate and failure mode are linked to fatigue behaviour of SFRC.
{"title":"Acoustic emission-based analysis of damage mechanisms in steel fibre reinforced concrete under monotonic and cyclic loading","authors":"M. D. Smedt, K. D. Wilder, L. Vandewalle, Els, Verstrynge","doi":"10.21012/FC10.235519","DOIUrl":"https://doi.org/10.21012/FC10.235519","url":null,"abstract":"This paper presents the experimental study of monotonic and cyclic behaviour of steel fibre reinforced concrete (SFRC), based on Acoustic Emission (AE) monitoring. Two research scales, namely fibre pull-out tests and bending tests on SFRC, are subjected to monotonic and cyclic loading, combined with AE measurements. In general, the use of non-destructive testing methods leads to a better understanding of the material’s behaviour, compared to traditional test setups. The different stages during pull-out and bending, and the corresponding energy dissipation mechanisms, are detected by AE activity and the occurring damage can be localised. Furthermore, upscaling of AE monitoring detects the propagation of damage and its failure modes. It is shown that AE activity, displacement rate and failure mode are linked to fatigue behaviour of SFRC.","PeriodicalId":329531,"journal":{"name":"Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures","volume":"27 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":"115053495","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":"Effect of the spatial correlation of damage properties of concrete on the structural cracking patterns","authors":"D. Bouhjiti","doi":"10.21012/FC10.235508","DOIUrl":"https://doi.org/10.21012/FC10.235508","url":null,"abstract":"","PeriodicalId":329531,"journal":{"name":"Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures","volume":"27 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":"133035722","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}
L. Mercuri, C. Rodriguez, Y. Xu, S. Figueiredo, R. Mors, E. Rossi, G. Anglani, P. Antonaci, B. Šavija, E. Schlangen
Soft inclusions, such as capsules and other particulate admixtures are increasingly being used in cementitious materials for functional purposes (i.e. self-healing and self-sensing of concrete). Yet, their influence on the fracture behaviour of the material is sometimes overlooked and requires in-depth study for the optimization of mechanical and/or smart properties. An experimental investigation is presented herein on the role of bacteria-based lactate-derived particles on the fracture behaviour of cement paste in tensile configuration. These admixtures are currently used for the purpose of self-healing. Digital Image Correlation was used to obtain strain contours on the surface of the samples during the test. The influence of soft particles addition and age of the samples on the fracture mechanics of the composite were investigated.
{"title":"On the role of soft inclusions on the fracture behaviour of cement paste","authors":"L. Mercuri, C. Rodriguez, Y. Xu, S. Figueiredo, R. Mors, E. Rossi, G. Anglani, P. Antonaci, B. Šavija, E. Schlangen","doi":"10.21012/FC10.235271","DOIUrl":"https://doi.org/10.21012/FC10.235271","url":null,"abstract":"Soft inclusions, such as capsules and other particulate admixtures are increasingly being used in cementitious materials for functional purposes (i.e. self-healing and self-sensing of concrete). Yet, their influence on the fracture behaviour of the material is sometimes overlooked and requires in-depth study for the optimization of mechanical and/or smart properties. An experimental investigation is presented herein on the role of bacteria-based lactate-derived particles on the fracture behaviour of cement paste in tensile configuration. These admixtures are currently used for the purpose of self-healing. Digital Image Correlation was used to obtain strain contours on the surface of the samples during the test. The influence of soft particles addition and age of the samples on the fracture mechanics of the composite were investigated.","PeriodicalId":329531,"journal":{"name":"Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures","volume":"92 3 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":"134261696","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":"Discrete element modelling of high performance concretes: effect of aggregates properties","authors":"A. Delaplace","doi":"10.21012/FC10.235355","DOIUrl":"https://doi.org/10.21012/FC10.235355","url":null,"abstract":"","PeriodicalId":329531,"journal":{"name":"Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures","volume":"76 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":"130530453","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}
Adding short fibres to cementitious materials improves their resistance to cracking. The fibres introduce crack-bridging mechanisms that reduce cracking, improve post-fracture mechanical behaviour and increase toughness. The accurate and efficient prediction of cracking in quasi-brittle materials with numerical models is a long-standing challenge. A constitutive model for fibre reinforced cementitious composites based on continuum micromechanics solutions is presented. The model assumes a two-phase elastic composite, derived from an Eshelby solution and the Mori-Tanaka scheme [1], which comprises a matrix phase representing the mortar and spherical inclusions representing the coarse aggregate particles. Additionally, circular microcracks with various orientations are distributed within the matrix phase. An exterior point Eshelby based criterion is employed to model crack-initiation in the matrixinclusion interface. Microcrack surfaces are assumed to be rough and able to regain contact under both normal and shear displacements. Once cracks start to develop, the crack-bridging action of fibres is simulated using a local constitutive equation that accounts for the debonding and pull-out of fibres with different orientations [2]. It is shown that the combination of the rough microcrack and fibre-bridging sub-models allows microcracking behaviour deriving from both tensile and compressive loads to be modelled in a unified manner. Numerical results obtained with the proposed micromechanical constitutive model are compared with experimental data. Good correlation between numerical and experimental responses demonstrates the potential of the model to capture key characteristics of the mechanical behaviour of fibre reinforced cementitious composites. Furthermore, the performance of the model when implemented in a finite element code is assessed. Finite element predictions are compared against experimental results from a series of flexural tests on fibre reinforced concrete beams in which the development and evolution of cracks was tracked on the surface of the specimens using Digital Image Correlation (DIC) equipment.
{"title":"A numerical and experimental investigation into the cracking of fibre reinforced cementitious materials","authors":"I. Mihai","doi":"10.21012/FC10.235635","DOIUrl":"https://doi.org/10.21012/FC10.235635","url":null,"abstract":"Adding short fibres to cementitious materials improves their resistance to cracking. The fibres introduce crack-bridging mechanisms that reduce cracking, improve post-fracture mechanical behaviour and increase toughness. The accurate and efficient prediction of cracking in quasi-brittle materials with numerical models is a long-standing challenge. A constitutive model for fibre reinforced cementitious composites based on continuum micromechanics solutions is presented. The model assumes a two-phase elastic composite, derived from an Eshelby solution and the Mori-Tanaka scheme [1], which comprises a matrix phase representing the mortar and spherical inclusions representing the coarse aggregate particles. Additionally, circular microcracks with various orientations are distributed within the matrix phase. An exterior point Eshelby based criterion is employed to model crack-initiation in the matrixinclusion interface. Microcrack surfaces are assumed to be rough and able to regain contact under both normal and shear displacements. Once cracks start to develop, the crack-bridging action of fibres is simulated using a local constitutive equation that accounts for the debonding and pull-out of fibres with different orientations [2]. It is shown that the combination of the rough microcrack and fibre-bridging sub-models allows microcracking behaviour deriving from both tensile and compressive loads to be modelled in a unified manner. Numerical results obtained with the proposed micromechanical constitutive model are compared with experimental data. Good correlation between numerical and experimental responses demonstrates the potential of the model to capture key characteristics of the mechanical behaviour of fibre reinforced cementitious composites. Furthermore, the performance of the model when implemented in a finite element code is assessed. Finite element predictions are compared against experimental results from a series of flexural tests on fibre reinforced concrete beams in which the development and evolution of cracks was tracked on the surface of the specimens using Digital Image Correlation (DIC) equipment.","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":"121853546","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 study takes place within the framework of nuclear facilities containment assessment in the case of a hypothetical accident where a large amount of vapour is released. We propose in this paper to simulate the COPAIN test cases in order to assess the vapor condensation model implemented in our CFD tool. The importance of this model is twofold. Indeed, it is also essential to estimate the associated potential leakage rate, i.e. to assess the mass flowrate through cracks in the containment concrete structures. In this context, the vapor condensation along the walls in the cracks is of relevant interest.
{"title":"Overview of mitigation models dedicated to severe accidents and consequences on flow rate through containment concrete structures","authors":"S. Mimouni","doi":"10.21012/FC10.235592","DOIUrl":"https://doi.org/10.21012/FC10.235592","url":null,"abstract":"This study takes place within the framework of nuclear facilities containment assessment in the case of a hypothetical accident where a large amount of vapour is released. We propose in this paper to simulate the COPAIN test cases in order to assess the vapor condensation model implemented in our CFD tool. The importance of this model is twofold. Indeed, it is also essential to estimate the associated potential leakage rate, i.e. to assess the mass flowrate through cracks in the containment concrete structures. In this context, the vapor condensation along the walls in the cracks is of relevant interest.","PeriodicalId":329531,"journal":{"name":"Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures","volume":"27 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":"122310450","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 present study deals with the numerical thermal odelling of two slab-specimens made of high performance concrete that underwent thermal spallin g tests. The specimens were equipped with thermocouples located at selected points and subjec ted on theirs undersides to a fire of the order of Eurocode 2 ISO 834 standard fire. The thermocouples responses were recorded and reported and some of them revealed the effects of presence of water i n zones near the specimens heating faces. Temperatures of the heated faces of the specimens w re measured and theirs evolutions with respect to time were used as inputs of the numerical modelling . The numerical modelling of the temperature field considering the selected points and using the stand ard concrete thermal characteristics was not satisfactory because the discrepancies between expe riment and modeling reached 41 to 63 °C at the highest temperatures. The study showed that by redu cing the thermal conductivity of the concrete, it i s possible to predict satisfactorily the specimen’s t hermal behavior during the spalling tests. Hence, t h numerical modelling of spalling tests with the use of thermo-mechanical approach becomes then possible. Key-words: Spalling tests, High performance concrete, spalling test bench, transient nonlinear thermal, thermal numerical modelling, thermo-mechanics approach, tem perature evolution prediction 1.Introduction The study of the thermal spalling of concretes is a complex subject that has been of interest to many researchers for a long time. It has an experimental dimension of observation of the phenomenon in order to understand the leading mechanisms and to e xplain it. Most of the studies conducted fall under this approach [1-3]. The various studies have shown that the causes are multiple but that in summary two main causes can explain these thermal instabili ties: the presence of a thermal gradient and the presence of water vapor in concrete migrating under th action of heat [4]. Studies have shown the existence of vapor pressure and thermal gradients [ 5]. Others focused on the influence of concrete constituents, on the differential expansion between c ment paste and aggregates, on the role of water in the process of thermal instability. Although the understanding of the phenomenon is quite advanced, further studies are still needed to reinforce or re fute certain assumptions currently used. It has a s econd dimension of modeling to help the partial understan ding of observed phenomena and whose ultimate goal would be to predict these thermal instabilitie s. There are far fewer studies in this area [6-7]. The phenomenon is complex because it induces phenomena of heat transfer and water transfer in a complex environment where chemical reactions contin ue to occur. If the aim is to treat the problem as a whole, we should adopt a thermo-hydro-chemo-mecha ni al approach and take into account the multi-scale dimension of the problem. The more comp lex the approach of the pr
本文对两个高性能混凝土板试件进行了热剥落试验，并进行了数值模拟。这些试样在选定的点上装有热电偶，并在它们的底面上进行符合欧洲规范2 ISO 834标准的火灾。记录和报告了热电偶响应，其中一些响应揭示了在试样加热面附近区域存在水的影响。测量了试样受热面的温度，并将其随时间的演变作为数值模拟的输入。考虑所选点并使用混凝土和混凝土热特性的温度场数值模拟并不令人满意，因为在最高温度下，实验与模拟的差异达到41 ~ 63℃。研究表明，通过降低混凝土的导热系数，可以令人满意地预测试件在剥落试验中的热行为。因此，利用热-力学方法对剥落试验进行数值模拟成为可能。关键词:剥落试验，高性能混凝土，剥落试验台，瞬态非线性热，热数值模拟，热力学方法，温度演化预测混凝土热剥落的研究是一个复杂的课题，长期以来一直受到许多研究者的关注。它有一个观察现象的实验维度，以便理解主要机制并解释它。大多数研究都属于这种方法[1-3]。各种研究表明，原因是多方面的，但总的来说，两个主要原因可以解释这些热不稳定性:热梯度的存在和在热作用下混凝土中水汽迁移的存在[4]。研究表明存在蒸汽压和热梯度[5]。其他研究则侧重于混凝土成分的影响，水泥膏体和骨料之间的差异膨胀，以及水在热不稳定过程中的作用。尽管对这一现象的理解已经相当先进，但仍需要进一步的研究来加强或反驳目前使用的某些假设。它的第二个维度是建模，以帮助部分理解观测到的现象，其最终目标是预测这些热不稳定性。在这一领域的研究要少得多[6-7]。这种现象是复杂的，因为它在化学反应不断发生的复杂环境中引起热传递和水传递现象。如果要把问题作为一个整体来处理，就应该采用热-水-化学-机械的方法，考虑到问题的多尺度。问题的方法越复杂，分析的质量就越好，计算的时间就越长，计算不收敛的风险也就越大。在这一领域，基于THM方法的研究已经产生了非常有趣的结果[Schreffler等人]。在目前的研究中，我们将研究领域限制在热力学方法上，这种方法有利于热梯度的影响作为混凝土热剥落的主要原因。与其他方法一样，这种方法的困难之一在于正确计算结构中的温度场，这是使应力和损伤的热力学计算切合实际的先决条件。为了解决这一问题，设计并实现了一个剥落试验台。第一次测试是在配备热电偶的规格上进行的，热电偶在测试过程中测量某些点的温度。所提出的研究探讨了试样的热行为在多大程度上可以通过使用有限元方法的试验数值模拟来预测。2.本课题研究的材料是一种高性能混凝土，其配方以正砂为基础。它由0- 2mm的Soc i<s:1> Nouvelle du Littoral正规砂、Vicat公司生产的水泥cem152.5、Condensil公司生产的硅粉Condensil SD95、Sika公司生产的高效减水剂Tempo 10和自来水组成。W/C为0.25。材料的各种成分根据指定的方案混合并铸造。模具由Plexig las和钢壁组装而成，尺寸为250x250x100 (mm)。将新拌混凝土放入模具中，分两步进行1 min 30s的振动。为了测量试样的选定点的温度，在浇铸过程中沿试样厚度放置了一些热电偶。 th_turn温度从857℃降至737℃，TH_S0温度从424℃降至358℃
{"title":"Experimental study of a very high performance concrete slab subjected to fire on its underside and numerical modeling of the temperature field","authors":"E. Ouedraogo","doi":"10.21012/FC10.235443","DOIUrl":"https://doi.org/10.21012/FC10.235443","url":null,"abstract":"The present study deals with the numerical thermal odelling of two slab-specimens made of high performance concrete that underwent thermal spallin g tests. The specimens were equipped with thermocouples located at selected points and subjec ted on theirs undersides to a fire of the order of Eurocode 2 ISO 834 standard fire. The thermocouples responses were recorded and reported and some of them revealed the effects of presence of water i n zones near the specimens heating faces. Temperatures of the heated faces of the specimens w re measured and theirs evolutions with respect to time were used as inputs of the numerical modelling . The numerical modelling of the temperature field considering the selected points and using the stand ard concrete thermal characteristics was not satisfactory because the discrepancies between expe riment and modeling reached 41 to 63 °C at the highest temperatures. The study showed that by redu cing the thermal conductivity of the concrete, it i s possible to predict satisfactorily the specimen’s t hermal behavior during the spalling tests. Hence, t h numerical modelling of spalling tests with the use of thermo-mechanical approach becomes then possible. Key-words: Spalling tests, High performance concrete, spalling test bench, transient nonlinear thermal, thermal numerical modelling, thermo-mechanics approach, tem perature evolution prediction 1.Introduction The study of the thermal spalling of concretes is a complex subject that has been of interest to many researchers for a long time. It has an experimental dimension of observation of the phenomenon in order to understand the leading mechanisms and to e xplain it. Most of the studies conducted fall under this approach [1-3]. The various studies have shown that the causes are multiple but that in summary two main causes can explain these thermal instabili ties: the presence of a thermal gradient and the presence of water vapor in concrete migrating under th action of heat [4]. Studies have shown the existence of vapor pressure and thermal gradients [ 5]. Others focused on the influence of concrete constituents, on the differential expansion between c ment paste and aggregates, on the role of water in the process of thermal instability. Although the understanding of the phenomenon is quite advanced, further studies are still needed to reinforce or re fute certain assumptions currently used. It has a s econd dimension of modeling to help the partial understan ding of observed phenomena and whose ultimate goal would be to predict these thermal instabilitie s. There are far fewer studies in this area [6-7]. The phenomenon is complex because it induces phenomena of heat transfer and water transfer in a complex environment where chemical reactions contin ue to occur. If the aim is to treat the problem as a whole, we should adopt a thermo-hydro-chemo-mecha ni al approach and take into account the multi-scale dimension of the problem. The more comp lex the approach of the pr","PeriodicalId":329531,"journal":{"name":"Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures","volume":"32 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":"124765269","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":"Improvement of impact-echo method by applying image recognition of sound spectrogram","authors":"H. Shimbo","doi":"10.21012/FC10.232724","DOIUrl":"https://doi.org/10.21012/FC10.232724","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":"124793075","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 Double Cantilever Beam (DCB) Mode I fracture testing has been widely used in fracture testing of especially fiber reinforced polymer composites and adhesive joints. Application of classical DCB testing to plain concrete or unreinforced ceramic specimens is not straightforward and cannot be carried out in direct separation mode as applied in such composite materials. Instead, in this study an indirect tension approach is proposed for testing concrete in Mode I fracture. Tests of notched geometrically similar DCB specimens made of normal and high strength concretes loaded eccentrically at the cantilever beam-column ends in compression have been carried out. The peak loads from these tests and their classical type II size effect analyses results are reported. The Microplane Model M7 is used to predict and verify the test results. To this end, the model is first calibrated independently of size effect test data using only the uniaxial compression tests. Next, the model M7 is used to predict the peak loads of tested specimens. Furthermore, to determine the errors involved in the size effect fracture parameters, the peak loads of virtual geometrically similar DCB specimens of appropriately chosen sizes were determined using the calibrated model. The same size effect analyses are performed on the predicted peak loads including those from the virtual specimens and the errors in the fracture parameters obtained from the classical size effect analyses of the peak loads obtained from the tests are determined.
{"title":"Double cantilever indirect tension fracture testing of concrete","authors":"F. Caner, A. Dönmez, S. Şener, Varol Koç","doi":"10.21012/FC10.235461","DOIUrl":"https://doi.org/10.21012/FC10.235461","url":null,"abstract":"The Double Cantilever Beam (DCB) Mode I fracture testing has been widely used in fracture testing of especially fiber reinforced polymer composites and adhesive joints. Application of classical DCB testing to plain concrete or unreinforced ceramic specimens is not straightforward and cannot be carried out in direct separation mode as applied in such composite materials. Instead, in this study an indirect tension approach is proposed for testing concrete in Mode I fracture. Tests of notched geometrically similar DCB specimens made of normal and high strength concretes loaded eccentrically at the cantilever beam-column ends in compression have been carried out. The peak loads from these tests and their classical type II size effect analyses results are reported. The Microplane Model M7 is used to predict and verify the test results. To this end, the model is first calibrated independently of size effect test data using only the uniaxial compression tests. Next, the model M7 is used to predict the peak loads of tested specimens. Furthermore, to determine the errors involved in the size effect fracture parameters, the peak loads of virtual geometrically similar DCB specimens of appropriately chosen sizes were determined using the calibrated model. The same size effect analyses are performed on the predicted peak loads including those from the virtual specimens and the errors in the fracture parameters obtained from the classical size effect analyses of the peak loads obtained from the tests are determined.","PeriodicalId":329531,"journal":{"name":"Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures","volume":"1 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":"129097902","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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