Aggregate-cement paste transition zone properties affecting the salt-frost damage of high-performance concretes

被引：120

作者：

Cwirzen, A ^{[1
]}

Penttala, V ^{[1
]}

机构：

[1] Aalto Univ, Lab Bldg Mat Technol, FIN-02015 Helsinki, Finland

来源：

CEMENT AND CONCRETE RESEARCH | 2005年 / 35卷 / 04期

关键词：

high-performance concrete; freezing and thawing; interfacial transition zone; EDX;

D O I：

10.1016/j.cemconres.2004.06.009

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

The influence of the cement paste-aggregate interfacial transition zone (ITZ) on the frost durability of high-performance silica fume concrete (HPSFC) has been studied. Investigation was carried out on eight non-air-entrained concretes having water-to-binder (W/B) ratios of 0.3, 0.35 and 0.42 and different additions of condensed silica fume. Studies on the microstructure and composition of the cement paste have been made by means of environmental scanning electron microscope (ESEM)-BSE, ESEM-EDX and mercury intrusion porosimetry (MIP) analysis. The results showed that the transition zone initiates and accelerates damaging mechanisms by enhancing movement of the pore solution within the concrete during freezing and thawing cycles. Cracks filled with ettringite were primarily formed in the ITZ. The test concretes having good frost-deicing salt durability featured a narrow transition zone and a decreased Ca/Si atomic ratio in the transition zone compared to the bulk cement paste. Moderate additions of silica fume seemed to density the microstructure of the ITZ. (c) 2004 Elsevier Ltd. All rights reserved.

引用

页码：671 / 679

页数：9

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