Durability of reactive powder concrete under chloride-salt freeze-thaw cycling

被引：66

作者：

Wang, Yue ^{[1
]}

An, Ming-zhe ^{[1
]}

Yu, Zi-ruo ^{[1
]}

Han, Song ^{[1
]}

Ji, Wen-yu ^{[1
]}

机构：

[1] Beijing Jiaotong Univ, Sch Civil Engn, Beijing 100044, Peoples R China

来源：

MATERIALS AND STRUCTURES | 2017年 / 50卷 / 01期

基金：

中国国家自然科学基金;

关键词：

Reactive powder concrete; Chloride-salt erosion; Freeze-thaw cycle; Compressive strength; Microstructure; DELAYED ETTRINGITE FORMATION; TEMPERATURE; SULFATE;

D O I：

10.1617/s11527-016-0878-5

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

The corrosion of reinforcements that results from chloride iron erosion and freeze-thaw damage is the key cause of concrete material failure. Indoor accelerated freeze-thaw cycling tests on reactive powder concrete are carried out in this study, and the mass-loss rate ( MLR), relative dynamic-elastic modulus ( RDEM), and compressive strength are measured in order to evaluate its durability. In addition, the microstructure and composition of the reactive powder concrete during the chloride-salt freeze-thaw cycles were analyzed using scanning electron microscopy, energy-dispersive spectroscopy, and mercury-intrusion porosimetry. The results show that the reactive powder concrete was durable under chloride freeze-thaw cycling. Furthermore, the values of MLR and RDEM indicated that the actual method is not suitable for reactive powder concrete and should be modified, and that ettringite-type erosion products are generated during the freeze-thaw cycles. The conclusions in this study are valid for specific reactive powder concrete mix.

引用

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