Comparison of alkali–silica reaction products of fly-ash- or lithium-salt-bearing mortar under long-term accelerated curing
- 作者：Ramyar ; K. ; Ç ; opuroglu ; O. ; Andiç ; Ö ; . ; Fraaij ; A.L.A.
- 关键词：Alkali&ndash ; aggregate reaction ; Accelerated curing ; SEM ; Fly ash ; Lithium compounds
- 刊名：Cement and Concrete Research
- 出版年：2004
- 期刊代码：12_00088846
- 类别：ms
- 出版时间：July, 2004
- 卷：34
- 期：7
- 页码：1179-1183
- 文件大小：460 K
摘要
The alkali–silica expansion of mortar specimens bearing fly ash (FA), lithium carbonate, and lithium fluoride under long-term accelerated curing was investigated. ASTM C1260 standard test method was applied and expansions were recorded up to 56 days. The composition of alkali–silica reaction (ASR) products was also studied by environmental scanning electron microscopy (ESEM). It was observed that in Li-bearing mixtures, the expansions ceased beyond 28 days. However, in fly-ash-bearing mixtures, the reactions were continued and expansions were increased steadily throughout the test. No clear correlation was found between the composition of massive reaction products and expansion values. However, except for lithium-fluoride-bearing samples, good correlation was observed between the composition of crystallized reaction products and expansion values.