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USE OF ADMIXTURES TO PREVENT EXCESSIVE EXPANSION OF CONCRETE DUE TO ALKALI-SILICA REACTION.
| 题名： | USE OF ADMIXTURES TO PREVENT EXCESSIVE EXPANSION OF CONCRETE DUE TO ALKALI-SILICA REACTION. |
| 作者： | Mather-B |
| 关键词： | CONCRETE-ADMIXTURES; PREVENTION-; EXPANSION-CONSTRUCTION-PHENOMENA; ALKALI-SILICA-REACTION; MINERALS-; BLAST-FURNACE-SLAG; EFFECTIVENESS-; PERMEABILITY-; CONCRETES-; CHEMICALS-; LITHIUM-SALTS; COST-EFFECTIVENESS |
| 摘要： | In the reports of the American Concrete Institute Committee 212 on Admixtures, beginning in 1954, reference was made to the use of admixtures, both chemical and mineral, to prevent excessive expansion of concrete caused by the alkali-silica reaction. Work on this topic began at least as far back as 1947. Few data on the use of admixtures for this purpose in field concrete are known to have been published. Laboratory test results suggest that mineral admixtures are effective in smaller and smaller amounts as the silica content, silica solubility, and fineness increase. Ground granulated iron blast-furnace slag, a hydraulic cement (often incorrectly called a mineral admixture), is highly effective when used to make up 60% or more of the cementitious medium. Its effectiveness probably derives from its ability to reduce the permeability of concrete to 1/10 to 1/100 that of concrete of equal strength made using portland cement alone. Similar effects may occur when mineral admixtures are used. The use of chemical admixtures based on soluble salts of lithium has been referred to in the literature for many years and was reexamined in detail by Stark in 1992 in the recent Strategic Highway Research Program project on alkali-silica reaction. It may be technically feasible, but it may not be cost-effective. |
| 总页数： | Transportation Research Record. 1993. (1382) pp99-103 (38 Ref.) |
| 报告类型： | 科技报告 |
相关文献
- IDENTIFICATION OF CHEMICAL AGENTS FOR THE CONTROL OF ALKALI-AGGREGATE REACTION IN CONCRETE.
- ALKALI-SILICA REACTIVITY RESISTANCE OF HIGH-VOLUME FLY ASH CEMENTITIOUS SYSTEMS.
- ASR Testing: A New Approach to Aggregate Classification and Mix Design Verification: Summary Report.
- PROPOSED GUIDELINES FOR THE PREVENTION OF ALKALI-SILICA REACTION IN NEW CONCRETE STRUCTURES.
- ALKALI-SILICA REACTIVITY: AN OVERVIEW OF RESEARCH.
- USE OF A LITHIUM-BEARING ADMIXTURE TO SUPPRESS EXPANSION IN CONCRETE DUE TO ALKALI-SILICA REACTION.
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