Experimental investigation of whole stress-strain curves of coral concrete
Experimental investigation of whole stress-strain curves of coral concrete
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珊瑚混凝土整体应力-应变曲线的试验研究
DOI：
10.1016/j.conbuildmat.2016.06.064
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发表时间：
2016-09-30
影响因子：
7.4
通讯作者：
Dou, Xuemei
中科院分区：
文献类型：
--
作者：
Da, Bo;Yu, Hongfa;Dou, Xuemei
采用棱柱试件研究了珊瑚混凝土的单轴压缩本构关系。采用等应力循环加卸载和等应变单调加载方法。测定了弹性模量(E-c)和泊松比(Mu)。结果表明，当试件应变接近最大值时，CPC以劈裂形式迅速破坏。整个应力应变曲线上升阶段由凹凸曲线组成，下降阶段相对较短。残余应力(Sigma(Ri))与峰值应力(Sigma(0i))之比为0.30~0.50，随着强度等级的增加，Sigma(Ri)/Sigma(0i)减小。提出了能够反映压缩试验全部特性的CPC两段本构方程。随着强度等级的增加，珊瑚混凝土的模数呈先增大后减小的趋势。CPC的E-c有增大的趋势。为了扩大CPC在海岛工程建设中的应用，可以采用超细水泥浆体、硅砂浆或聚合物对珊瑚表面进行加固。在CPC中加入钢筋、钢纤维或有机纤维也可以提高CPC的强度和韧性。(C)2016爱思唯尔有限公司。保留所有权利。
The constitutive relationship of coral concrete (CPC) was researched using prismatic specimens under uniaxial compression. The equal stress cycle loading and unloading and equal strain monotonic loading methods were adopted. The elastic modulus (E-c) and Poisson's ratio (mu) were determined. The results showed that when the specimen strain was close to the maximum, CPC was rapidly damaged in the form of splitting. The whole stress-strain curve ascent stage was composed of concave and convex curves, while the descent stage was relatively short. The ratio of residual stress (sigma(ri)) and peak stress (sigma(0i)) was 0.30-0.50, and with increase in the strength grade, sigma(ri)/sigma(0i) decreased. The two-part constitutive equations of CPC were presented, which could reflect all the characteristics of the compression tests. With increase in the strength grade, the mu of coral concrete first increased and then decreased. The E-c of CPC tended to increase. To expand the application of CPC in island engineering construction, superfine cement paste, silicon mortar, or polymer could be used to strengthen the coral surface. Adding steel bar, steel fibre, or organic fibre into CPC could also increase the CPC strength and tenacity. (C) 2016 Elsevier Ltd. All rights reserved.