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The preventive effect of mineral admixtures on alkali-silica reaction and its mechanism
AbstractThe preventive effect of tuff, fly ash and blast furnace slag on alkali-silica reaction has been investigated. Results show that by same amount of addition the order of effectiveness is tuff > fly ash > slag. It is suggested that the preventive effects of the admixtures are related to their acidities, the more the content of the acid oxides in the admixture, the better is the latter's preventive effect. Experiments prove that the addition of 10% CaO to the blended cement increases the expansion caused by alkali-silica reaction. It is obvious that the preventive effect of admixture is also related to the Ca(OH)2 content of the cement paste, i.e., to the basicity of the blended cement. Low basicity is favourable to the preventive effect. The authors conceive that the concentration of the K+ and Na+ ions on the surface of the admixture particles may also constitute one of the causes of the preventive effect.
The preventive effect of mineral admixtures on alkali-silica reaction and its mechanism
AbstractThe preventive effect of tuff, fly ash and blast furnace slag on alkali-silica reaction has been investigated. Results show that by same amount of addition the order of effectiveness is tuff > fly ash > slag. It is suggested that the preventive effects of the admixtures are related to their acidities, the more the content of the acid oxides in the admixture, the better is the latter's preventive effect. Experiments prove that the addition of 10% CaO to the blended cement increases the expansion caused by alkali-silica reaction. It is obvious that the preventive effect of admixture is also related to the Ca(OH)2 content of the cement paste, i.e., to the basicity of the blended cement. Low basicity is favourable to the preventive effect. The authors conceive that the concentration of the K+ and Na+ ions on the surface of the admixture particles may also constitute one of the causes of the preventive effect.
The preventive effect of mineral admixtures on alkali-silica reaction and its mechanism
Tang Ming-shu (author) / Ye Yu-feng (author) / Yuan Mei-qi (author) / Zhen Shi-hua (author)
Cement and Concrete Research ; 13 ; 171-176
1982-09-13
6 pages
Article (Journal)
Electronic Resource
English
Mechanism of Using Mineral Admixtures in Concrete to Suppress Alkali-Silica Reaction
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