Influence of aggregate size and volume fraction on shrinkage induced micro-cracking of concrete and mortar
Influence of aggregate size and volume fraction on shrinkage induced micro-cracking of concrete and mortar
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DOI：
10.1016/j.cemconres.2009.09.012
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发表时间：
2010-01-01
影响因子：
11.4
通讯作者：
Buenfeld, Nick R.
中科院分区：
文献类型：
--
作者：
Grassl, Peter;Wong, Hong S.;Buenfeld, Nick R.
研究了骨料粒径和体积分数对混凝土和砂浆收缩微裂缝和渗透性的影响。对具有规则骨料排列和随机骨料排列的模型混凝土和砂浆试件进行了非线性有限元分析。聚集体直径在2和16 mm之间变化。此外，研究了体积分数在0.1和0.5之间的范围。非线性分析的基础上的二维晶格方法，其中骨料被简化为单一尺寸的圆柱形夹杂物。通过裂缝长度、裂缝宽度和渗透率的变化对分析结果进行了解释。结果表明，增加骨料直径（等体积分数）和减少体积分数（等骨料直径）增加裂缝宽度，从而大大增加渗透性。(C)2009爱思唯尔有限公司版权所有。
In this paper, the influence of aggregate size and volume fraction on shrinkage induced micro-cracking and permeability of concrete and mortar was investigated. Nonlinear finite element analyses of model concrete and mortar specimens with regular and random aggregate arrangements were performed. The aggregate diameter was varied between 2 and 16 mm. Furthermore, a range of volume fractions between 0.1 and 0.5 was studied. The nonlinear analyses were based on a 2D lattice approach in which aggregates were simplified as monosized cylindrical inclusions. The analysis results were interpreted by means of crack length, crack width and change of permeability. The results show that increasing aggregate diameter (at equal volume fraction) and decreasing volume fraction (at equal aggregate diameter) increase crack width and consequently greatly increases permeability. (C) 2009 Elsevier Ltd. All rights reserved.