Freezing and thawing resistance of air-entrained concrete incorporating recycled coarse aggregate: The role of air content in demolished concrete

被引：184

作者：

Gokce, A ^{[1
]}

Nagataki, S

Saeki, T

Hisada, M

机构：

[1] Taisei Corp, Civil Engn Res Inst, Ctr Technol, Yokohama, Kanagawa 2450051, Japan

[2] Aichi Inst Technol, Ind Technol Res Inst, Aichi 4700392, Japan

[3] Niigata Univ, Dept Civil Engn & Architecture, Niigata 9502181, Japan

[4] Publ Works Res Inst, Concrete Div, Tsukuba, Ibaraki 3050804, Japan

来源：

CEMENT AND CONCRETE RESEARCH | 2004年 / 34卷 / 05期

基金：

日本学术振兴会;

关键词：

demolished concrete; air content; recycled coarse aggregate; freezing and thawing; microcracking;

D O I：

10.1016/j.cemconres.2003.09.014

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

This study aims to introduce new information on freezing and thawing resistance when air-entrained or non-air-entrained concrete is used as recycled coarse aggregate into air-entrained concrete. The laboratory produced air-entrained and non-air-entrained concretes with a water/cement (w/c) ratio of 0.45 were recycled at the crushing age of 1 year to obtain the coarse aggregates used in the investigations. The recycling process was performed in three stages to produce recycled coarse aggregates with different adhered mortar contents. The results showed that recycled coarse aggregate produced from non-air-entrained concrete caused poor freezing and thawing resistance in concrete even when the new system had a proper air entrainment. Microstructural studies indicated that non-air-entrained adhered mortar caused disintegration of the recycled coarse aggregate in itself and disrupted the surrounding new mortar after a limited number of freezing and thawing cycles. Minimizing non-air-entrained adhered mortar or enhancing the performance of new surrounding matrix could not give satisfactory results for a long freezing and thawing exposure. (C) 2004 Published by Elsevier Ltd.

引用

页码：799 / 806

页数：8

共 19 条

[1]

Buck A., 1977, ACI J, P212

[2]

Dillmann R., 1998, P INT S HELD DEP TRA, P239

[3]

Forster S. W., 1994, 3 CANMET ACI INT C D, P17

[4]

GOKCE A, 2001, THESIS NIIGATA U NII

[5] FLUORESCENT LIQUID REPLACEMENT TECHNIQUE, A MEANS OF CRACK DETECTION AND WATER/BINDER RATIO DETERMINATION IN HIGH-STRENGTH CONCRETES [J].

GRAN, HC .

CEMENT AND CONCRETE RESEARCH, 1995, 25 (05) :1063-1074

[6]

HOSOKAWA Y, 1997, P CSCE JSCE INT C EN, P775

[7]

JENSEN D, 1996, MAT CONSTRUCTIONS MA, V29, P3

[8]

Kasai Y., 1988, P 2 INT S RILEM DEMO, V2, P623

[9]

KAWAMURA M, 1988, P 2 INT S RILEM DEM, V2, P726

[10]

KUKKO H, 1992, THESIS TECHNICAL RES, V126

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