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自密实混凝土动态压缩性能的试验研究

An Experimental Study of Dynamic Compression Performance of Self-Compacting Concrete.

作者信息

Shi Feiting, Cao Peng, Wang Ziyu, Gan Yanan, Zhou Changjun, Liu Ketong

机构信息

Civil Engineering Department, Yancheng Institute of Technology, Yancheng 224051, China.

College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China.

出版信息

Materials (Basel). 2020 Aug 24;13(17):3731. doi: 10.3390/ma13173731.

DOI:10.3390/ma13173731
PMID:32846989
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7504497/
Abstract

To investigate the dynamic performance of self-compacting concrete (SCC), the dynamic uniaxial compression tests at eight different loading strain rates were performed on the ordinary concrete and SCC cubic specimens. Based on the tests, the compression failure patterns and stress-strain curves of both kinds of concrete were obtained. The results show that SCC performs more brittle than ordinary concrete by showing the diagonal crack failure pattern of SCC at a high strain rate. Besides, with the increase of loading strain rate, the peak compressive stress of SCC is slightly lower than that of ordinary concrete, but the increase of elastic modulus is slightly higher than that of ordinary concrete. The peak compressive strains of the two kinds of concrete are discrete under the influence of loading strain rate, thus putting forward the relation equation for the loading strain rate and peak compressive stress increase coefficient of the two kinds of concrete. Besides, based on the theory of elastic-plastic damage and considering the dynamic extension of damage, the dynamic constitutive relation with good applicability between ordinary concrete and SCC was established.

摘要

为研究自密实混凝土（SCC）的动态性能，对普通混凝土和SCC立方体试件进行了8种不同加载应变率下的动态单轴压缩试验。基于试验，得到了两种混凝土的压缩破坏模式和应力-应变曲线。结果表明，SCC在高应变率下呈现对角裂缝破坏模式，比普通混凝土表现得更脆。此外，随着加载应变率的增加，SCC的峰值压应力略低于普通混凝土，但其弹性模量的增加略高于普通混凝土。在加载应变率的影响下，两种混凝土的峰值压应变离散，从而提出了两种混凝土加载应变率与峰值压应力增大系数的关系式。此外，基于弹塑性损伤理论并考虑损伤的动态扩展，建立了普通混凝土与SCC之间适用性良好的动态本构关系。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3feb/7504497/d9e5e68d3525/materials-13-03731-g015.jpg
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本文引用的文献

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Materials (Basel). 2019 Dec 18;13(1):10. doi: 10.3390/ma13010010.
2
The Effect of the Morphology of Coarse Aggregate on the Properties of Self-Compacting High-Performance Fibre-Reinforced Concrete.粗集料形态对自密实高性能纤维增强混凝土性能的影响
Materials (Basel). 2018 Aug 7;11(8):1372. doi: 10.3390/ma11081372.
3
The Influence of Phase Change Materials on the Properties of Self-Compacting Concrete.
相变材料对自密实混凝土性能的影响
Materials (Basel). 2013 Aug 15;6(8):3530-3546. doi: 10.3390/ma6083530.