Use of γ-Al2O3 to prevent alkali-silica reaction by altering solid and aqueous compositions of hydrated cement paste

被引：37

作者：

Zhou, Jin ^{[1
]}

Zheng, Keren ^{[1
]}

Liu, Zanqun ^{[1
]}

Chen, Lou ^{[1
]}

Lippiatt, Nicholas ^{[2
]}

机构：

[1] Cent South Univ, Sch Civil Engn, Changsha 410075, Hunan, Peoples R China

[2] Hunan Univ, Coll Civil Engn, Changsha 410082, Hunan, Peoples R China

来源：

CEMENT AND CONCRETE RESEARCH | 2019年 / 124卷

基金：

中国国家自然科学基金;

关键词：

Alkali-silica reaction; Aqueous Al species; Pore solution; Phase assemblage; C-S-H; PORTLAND-CEMENT; GAMMA-ALUMINA; NANO-ALUMINA; REACTION ASR; PART II; WATER; METAKAOLIN; MECHANISMS; SURFACE;

D O I：

10.1016/j.cemconres.2019.105817

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

This study aims to explore the feasibility of preventing alkali-silica reaction (ASR) in concrete by adding gamma-Al2O3. A binder composed of 90% Portland cement and 10% gamma-Al2O3 was studied, where gamma-Al2O3 was incorporated as a solid aluminum source to produce Al-bearing hydrates of high solubility, thus increasing aqueous Al concentration. The precipitation of katoite was predicted through thermodynamic simulation and confirmed experimentally by means of XRD and TGA in the hydrating binder. As a result, Al concentration in pore solution increased up to nearly 0.8 mM at 90 days. At such high concentration, the efficiency of aqueous Al in controlling alkali-silica reaction was confirmed by accelerated mortar bars tests. Clear surfaces of aggregates in mortar accelerated for 400 days (ASTM C227 conditions) were observed through SEM examination, which demonstrates the resistance of aqueous Al on the dissolution of reactive silica.

引用

页数：8

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