Quantitative evaluation of elastic modulus of concrete with nanoidentation and homogenization method

被引：37

作者：

Li, Yaqiang ^{[1
]}

Li, Yue ^{[1
]}

Wang, Rui ^{[1
]}

机构：

[1] Beijing Univ Technol, MOE, Key Lab Urban Secur & Disaster Engn, Beijing 100124, Peoples R China

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2019年 / 212卷

基金：

北京市自然科学基金; 中国国家自然科学基金; 国家重点研发计划;

关键词：

Concrete; Elastic modulus; Nanoidentation; Interfacial transition zone; Homogenization theoretical model; INTERFACIAL TRANSITION ZONE; MECHANICAL-PROPERTIES; SILICATE HYDRATE; CEMENT PASTE; BULK MODULUS; NANOINDENTATION; AGGREGATE; DRY;

D O I：

10.1016/j.conbuildmat.2019.04.002

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

This paper aims to evaluate the elastic modulus of concrete with nanoidentation technique and homogenization method. In this paper, concrete is divided into two parts: coarse pore and matrix. It is assumed that matrix is composed of five phases: stone aggregate, ITZ-1 (interfacial transition zone around stone aggregate), sand, ITZ-2 (interfacial transition zone around sand) and paste. Based on the Ca/Si ratio change in interface region, the thicknesses of interfacial transition zone around stone and sand were determined, respectively. The elastic moduli of stone, ITZ-1, sand, ITZ-2 and paste were determined by nanoidentation technique. The volume fraction of each phase was determined by Lu & Torquato model. The elastic modulus of matrix was calculated by Self-Consistent Method. Then, combining with the porosity of coarse pore determined by hardened concrete pore structure analyzer, the elastic modulus of concrete could be obtained by Mori-Tanaka method. Through comparison, it is found that the error between the theoretical calculation value and the macroscopic test value is within 10%. Therefore, the effectiveness of theoretical prediction model proposed in this paper was verified. (C) 2019 Elsevier Ltd. All rights reserved.

引用

页码：295 / 303

页数：9

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