Modeling the apparent and intrinsic viscoelastic relaxation of hydrating cement paste

被引：38
|
作者：
Li, X. [1 ]
Grasley, Z. C. [1 ]
Garboczi, E. J. [2 ]
Bullard, J. W. [2 ]
机构：
[1] Texas A&M Univ, Zachry Dept Civil Engn, College Stn, TX 77843 USA
[2] NIST, Mat & Struct Syst Div, Engn Lab, Gaithersburg, MD 20899 USA
来源：
CEMENT & CONCRETE COMPOSITES | 2015年 / 55卷
基金：
美国国家科学基金会;
关键词：
C-S-H; Finite element analysis; Microstructure; Viscoelastic; Dissolution; THAMES; LINEAR ELASTIC PROPERTIES; MEASURING PERMEABILITY; STRESS-RELAXATION; PORTLAND-CEMENT; CONCRETE; CREEP; SOLIDIFICATION; WATER;
D O I：
10.1016/j.cemconcomp.2014.09.012
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Finite element procedures combined with microstructure development modeling are integrated to quantitatively predict the viscoelastic/viscoplastic relaxation of cement paste due to intrinsic calcium silicate hydrate viscoelasticity and microstructure evolution associated with the hydration process. The combined models are implemented in a computational routine to predict time-dependent stress and strain fields in cement paste. The model simulations suggest that inherent viscoelastic deformation caused by calcium silicate hydrate is not necessarily the primary mechanism leading to the overall early-age viscoelastic/viscoplastic behavior of cement paste. The effect of time-dependent dissolution of cement grains occurring during the hydration process is substantial and should be considered as a significant mechanism for the apparent viscoelasticity/viscoplasticity of cement paste. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码：322 / 330
页数：9
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