Experimental investigation of rigid confinement effects of radial strain on dynamic mechanical properties and failure modes of concrete

In this study, to confirm the effect of confining pressure on dynamic mechanical behavior and failure modes of concrete, a split Hopkinson pressure bar dynamic loading device was utilized to perform dynamic compressive experiments under confined and unconfined conditions. The confining pressure was...

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Main Authors: Pengfei Liu, Xiaoping Zhou, Qihu Qian
Format: Article
Language:English
Published: Elsevier 2021-09-01
Series:International Journal of Mining Science and Technology
Subjects:
Online Access:http://www.sciencedirect.com/science/article/pii/S2095268621000616
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author Pengfei Liu
Xiaoping Zhou
Qihu Qian
author_facet Pengfei Liu
Xiaoping Zhou
Qihu Qian
author_sort Pengfei Liu
collection DOAJ
description In this study, to confirm the effect of confining pressure on dynamic mechanical behavior and failure modes of concrete, a split Hopkinson pressure bar dynamic loading device was utilized to perform dynamic compressive experiments under confined and unconfined conditions. The confining pressure was achieved by applying a lateral metal sleeve on the testing specimen which was loaded in the axial direction. The experimental results prove that dynamic peak axial stress, dynamic peak lateral stress, and peak axial strain of concrete are strongly sensitive to the strain rate under confined conditions. Moreover, the failure patterns are significantly affected by the stress-loading rate and confining pressure. Concrete shows stronger strain rate effects under an unconfined condition than that under a confined condition. More cracks are created in concrete subjected to uniaxial dynamic compression at a higher strain rate, which can be explained by a thermal-activated mechanism. By contrast, crack generation is prevented by confinement. Fitting formulas of the dynamic peak stress and dynamic peak axial strain are established by considering strain rate effects (50–250 s−1) as well as the dynamic confining increase factor (DIFc).
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spelling doaj.art-6d30facd16db4e50af0271adca69839b2022-12-21T22:39:16ZengElsevierInternational Journal of Mining Science and Technology2095-26862021-09-01315939951Experimental investigation of rigid confinement effects of radial strain on dynamic mechanical properties and failure modes of concretePengfei Liu0Xiaoping Zhou1Qihu Qian2School of Civil Engineering, Chongqing University, Chongqing 400044, ChinaSchool of Civil Engineering, Chongqing University, Chongqing 400044, China; School of Civil Engineering, Wuhan University, Wuhan 430072, China; Corresponding author.PLA University of Science and Technology, Nanjing 210007, ChinaIn this study, to confirm the effect of confining pressure on dynamic mechanical behavior and failure modes of concrete, a split Hopkinson pressure bar dynamic loading device was utilized to perform dynamic compressive experiments under confined and unconfined conditions. The confining pressure was achieved by applying a lateral metal sleeve on the testing specimen which was loaded in the axial direction. The experimental results prove that dynamic peak axial stress, dynamic peak lateral stress, and peak axial strain of concrete are strongly sensitive to the strain rate under confined conditions. Moreover, the failure patterns are significantly affected by the stress-loading rate and confining pressure. Concrete shows stronger strain rate effects under an unconfined condition than that under a confined condition. More cracks are created in concrete subjected to uniaxial dynamic compression at a higher strain rate, which can be explained by a thermal-activated mechanism. By contrast, crack generation is prevented by confinement. Fitting formulas of the dynamic peak stress and dynamic peak axial strain are established by considering strain rate effects (50–250 s−1) as well as the dynamic confining increase factor (DIFc).http://www.sciencedirect.com/science/article/pii/S2095268621000616Strain rate effectMultiaxial loadingDynamic peak axial stressThermo-activated mechanismDynamic increase factor
spellingShingle Pengfei Liu
Xiaoping Zhou
Qihu Qian
Experimental investigation of rigid confinement effects of radial strain on dynamic mechanical properties and failure modes of concrete
International Journal of Mining Science and Technology
Strain rate effect
Multiaxial loading
Dynamic peak axial stress
Thermo-activated mechanism
Dynamic increase factor
title Experimental investigation of rigid confinement effects of radial strain on dynamic mechanical properties and failure modes of concrete
title_full Experimental investigation of rigid confinement effects of radial strain on dynamic mechanical properties and failure modes of concrete
title_fullStr Experimental investigation of rigid confinement effects of radial strain on dynamic mechanical properties and failure modes of concrete
title_full_unstemmed Experimental investigation of rigid confinement effects of radial strain on dynamic mechanical properties and failure modes of concrete
title_short Experimental investigation of rigid confinement effects of radial strain on dynamic mechanical properties and failure modes of concrete
title_sort experimental investigation of rigid confinement effects of radial strain on dynamic mechanical properties and failure modes of concrete
topic Strain rate effect
Multiaxial loading
Dynamic peak axial stress
Thermo-activated mechanism
Dynamic increase factor
url http://www.sciencedirect.com/science/article/pii/S2095268621000616
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AT xiaopingzhou experimentalinvestigationofrigidconfinementeffectsofradialstrainondynamicmechanicalpropertiesandfailuremodesofconcrete
AT qihuqian experimentalinvestigationofrigidconfinementeffectsofradialstrainondynamicmechanicalpropertiesandfailuremodesofconcrete