Microstructural characterization of ITZ in blended cement concretes and its relation to transport properties

被引：233

作者：

Wu, Kai ^{[1
,2
]}

Shi, Huisheng ^{[1
]}

Xu, Linglin ^{[1
]}

Ye, Guang ^{[2
,3
]}

De Schutter, Geert ^{[2
]}

机构：

[1] Tongji Univ, Minist Educ, Key Lab Adv Civil Engn Mat, Shanghai 201804, Peoples R China

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

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

来源：

CEMENT AND CONCRETE RESEARCH | 2016年 / 79卷

基金：

中国国家自然科学基金;

关键词：

ITZ (B); Blended cement (D); Aggregate (D); Characterization (B); Transport properties (C); INTERFACIAL TRANSITION ZONE; BLAST-FURNACE SLAG; PASTE-AGGREGATE INTERFACE; HIGH-PERFORMANCE CONCRETE; SILICA FUME; FLY-ASH; LIMESTONE FILLER; PORE STRUCTURE; MECHANICAL-PROPERTIES; PORTLAND CEMENTS;

D O I：

10.1016/j.cemconres.2015.09.018

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

The improvements in the overall performances of concrete with blended materials were often ascribed to the modification of its hardened paste in general. In this paper, the effects of limestone filler (LF) and slag (GGBS) on chloride migration and water absorption of concretes with systematically varied aggregate properties were evaluated from the view point of ITZ by using BSE image, EDS, and MIP analysis. It was found that the incorporation of moderate amount of LF and GGBS would compact the microstructure of both ITZ and bulk cement matrix. The reduction in the pore volume (>100 nm) contributes to the largest decrease in total porosity. Additionally, incorporating GGBS avoids the build-up of Ca(OH)(2) within ITZ and provides a more uniform microstructure. The mechanism for the improvement in limiting water and ions penetration was found to be mainly related to the densification of bulk cement matrix rather than the modification of ITZ. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：243 / 256

页数：14

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