Effect of Al on the formation and structure of alkali-silica reaction products

被引：37

作者：

Shi, Zhenguo ^{[1
]}

Ma, Bin ^{[1
]}

Lothenbach, Barbara ^{[1
,2
]}

机构：

[1] Swiss Fed Labs Mat Sci & Technol Empa, Lab Concrete & Construct Chem, CH-8600 Diibendorf, Switzerland

[2] Norwegian Univ Sci & Technol NTNU, Dept Struct Engn, N-7491 Trondheim, Norway

来源：

CEMENT AND CONCRETE RESEARCH | 2021年 / 140卷

基金：

瑞士国家科学基金会;

关键词：

Alkali-silica reaction; Aluminum; Mitigation; Shlykovite; Synthesis; C-S-H; HYDRATED PORTLAND CEMENTS; FLY-ASH; THERMODYNAMIC PROPERTIES; BLENDED CEMENTS; TERNARY BLENDS; PORE SOLUTION; PART II; NMR; CONCRETE;

D O I：

10.1016/j.cemconres.2020.106311

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

The use of Al-rich supplementary cementitious materials can effectively reduce the expansion of concrete caused by alkali-silica reaction (ASR). However, the role of Al in mitigating the formation and structure of ASR products is only poorly understood, since direct investigation of the reaction in the micro-scale veins of aggregates is difficult. Recent successful synthesis of ASR products provides a unique opportunity to directly assess the role of Al in ASR. In this study, the effect of Al on the formation and structure of ASR products synthesized at 40 and 80 degrees C is investigated. It is found that the presence of Al in concentration lower than 0.1 mM neither prevents ASR nor alters the structure of the crystalline ASR products formed at 40 degrees C. However, formation of the crystalline ASR product at 80 degrees C is lowered at higher Al content due to the formation of a zeolitic precursor.

引用

页数：11

共 68 条

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