Micro- and meso-scale pore structure in mortar in relation to aggregate content

被引：69

作者：

Gao, Yun ^{[1
]}

De Schutter, Geert ^{[1
]}

Ye, Guang ^{[1
,2
]}

机构：

[1] Univ Ghent, Dept Struct Engn, Magnel Lab Concrete Res, B-9052 Ghent, Belgium

[2] Delft Univ Technol, Fac Civil Engn & Geosci, Microlab, NL-2628 CN Delft, Netherlands

来源：

CEMENT AND CONCRETE RESEARCH | 2013年 / 52卷

关键词：

Interfacial transition zone; Bulk paste; Aggregate content; Backscattered electron imaging; Modified hard core/soft shell (HCSS) model; INTERFACIAL TRANSITION ZONE; CEMENT-BASED MATERIALS; PAPER PATCH MICROSTRUCTURE; PORTLAND-CEMENT; NUMERICAL-SIMULATION; IMAGE-ANALYSIS; CONCRETE; PERCOLATION; PACKING; PASTE;

D O I：

10.1016/j.cemconres.2013.05.011

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Mortar is often viewed as a three-phase composite consisting of aggregate, bulk paste, and an interfacial transition zone (ITZ). However, this description is inconsistent with experimental findings because of the basic assumption that larger pores are only present within the ITZ. In this paper, we use bacicscattered electron (BSE) imaging to investigate the micro- and meso-scale structure of mortar with varying aggregate content. The results indicate that larger pores are present not only within the ITZ but also within areas far from aggregates. This phenomenon is discussed in detail based on a series of analytical calculations, such as the effective water binder ratio and the inter-aggregate spacing. We developed a modified computer model that includes a two-phase structure for bulk paste. This model interprets previous mercury intrusion porosimetry data very well. Crown Copyright (C) 2013 Published by Elsevier Ltd. All rights reserved.

引用

页码：149 / 160

页数：12

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