Improvement in corrosion resistance of recycled aggregate concrete by nano silica suspension modification on recycled aggregates

被引：112

作者：

Zeng, Weilai ^{[1
,2
]}

Zhao, Yuxi ^{[1
]}

Zheng, Haibing ^{[2
]}

Poon, Chi Sun ^{[2
]}

机构：

[1] Zhejiang Univ, Inst Struct Engn, Hangzhou 310058, Zhejiang, Peoples R China

[2] Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hung Hom, Kowloon, Hong Kong, Peoples R China

来源：

CEMENT & CONCRETE COMPOSITES | 2020年 / 106卷

基金：

中国国家自然科学基金;

关键词：

Recycled aggregate concrete; Nano-modification; Corrosion; Cracks; Interfacial transition zone; SIZE DISTRIBUTION; INDUCED CRACKING; CONSTRUCTION; PENETRATION; NANO-SIO2; STRENGTH; STEEL; SHAPE;

D O I：

10.1016/j.cemconcomp.2019.103476

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

This work modified recycled aggregates (RAs) by soaking them in a nano-silica (NS) suspension and evaluated the modification effects on recycled aggregate concrete (RAC). Firstly, different soaking times were studied based on the surface microhardness and the penetration depth of NS particles in the RA. Secondly, mechanical properties (e.g., compressive strength and microhardness of interfacial transition zones) and durability properties (e.g., steel corrosion and corrosion-induced cracking) were tested. The 1-h soaking modification was selected as the optimal soaking time. The nano-modification improved the protection of steel and the resistance to corrosion-induced cracking, which was believed to be related to the improvement of the ITZ properties according to the microhardness test results.

引用

页数：8

共 38 条

[1] Acid Treatment Technique for Determining the Mortar Content of Recycled Concrete Aggregates [J].

Akbarnezhad, A. ;

Ong, K. C. G. ;

Zhang, M. H. ;

Tam, C. T. .

JOURNAL OF TESTING AND EVALUATION, 2013, 41 (03) :441-450

[2] Microwave-assisted beneficiation of recycled concrete aggregates [J].

Akbarnezhad, A. ;

Ong, K. C. G. ;

Zhang, M. H. ;

Tam, C. T. ;

Foo, T. W. J. .

CONSTRUCTION AND BUILDING MATERIALS, 2011, 25 (08) :3469-3479

[3] COVER CRACKING AS A FUNCTION OF BAR CORROSION .1. EXPERIMENTAL TEST [J].

ANDRADE, C ;

ALONSO, C ;

MOLINA, FJ .

MATERIALS AND STRUCTURES, 1993, 26 (162) :453-464

[4]

[Anonymous], 2003, IEEJ T ELECT INF SYS, DOI DOI 10.1541/IEEJEISS.123.1680

[5] Assessment of a microwave-assisted recycling process for the recovery of high-quality aggregates from concrete waste [J].

Bru, Kathy ;

Touze, Solene ;

Bourgeois, Florent ;

Lippiatt, Nicholas ;

Menard, Yannick .

INTERNATIONAL JOURNAL OF MINERAL PROCESSING, 2014, 126 :90-98

[6]

Cornell R.M., 1996, IRON OXIDES

[7] Influence of amount of recycled coarse aggregates and production process on properties of recycled aggregate concrete [J].

Etxeberria, M. ;

Vazquez, E. ;

Mari, A. ;

Barra, M. .

CEMENT AND CONCRETE RESEARCH, 2007, 37 (05) :735-742

[8] Modification of recycled concrete aggregate by calcium carbonate biodeposition [J].

Grabiec, Anna M. ;

Klama, Justyna ;

Zawal, Daniel ;

Krupa, Dana .

CONSTRUCTION AND BUILDING MATERIALS, 2012, 34 :145-150

[9]

Hansen T.C., 2014, RECYCLING DEMOLISHED

[10] Treatments for the improvement of recycled aggregate [J].

Katz, A .

JOURNAL OF MATERIALS IN CIVIL ENGINEERING, 2004, 16 (06) :597-603

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