DURABILITY OF DSP MORTARS EXPOSED TO CONDITIONS OF WETTING AND DRYING
DSP mortar bars used to measure volume changes as a result of exposure to wetting and drying have expanded and failed. Petrographic investigation showed that the failures have occurred due to alkali-aggregate reaction of undispersed agglomerates of silica fume. Investigation of the particle size ranges and dispersibility of a range of silica fumes showed that they were all agglomerated to varying degrees and that the dispersibility is dependent on source and age of the silica fume. It is concluded that unless silica fume can be adequately dispersed in DSP materials there will be a potential for alkali-aggregate reaction to occur where the exposure conditions involve wetting and drying.
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Corporate Authors:
American Concrete Institute (ACI)
38800 Country Club Drive
Farmington Hills, MI United States 48331 -
Authors:
- St John, D A
- McLeod, L C
- Milestone, N B
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Conference:
- International Workshop on High Performance Concrete (Edited by Paul Zia)
- Location: Bangkok, Thailand
- Date: 1994-11-21 to 1994-11-22
- Publication Date: 1994
Language
- English
Media Info
- Features: Figures;
- Pagination: p. 45-56
Subject/Index Terms
- TRT Terms: Alkali aggregate reactions; Geological surveying; Mortar; Petrography; Silica fume; Wetting and drying tests
- Old TRIS Terms: Petrographic investigations
- Subject Areas: Highways; Materials; I32: Concrete;
Filing Info
- Accession Number: 00728917
- Record Type: Publication
- Report/Paper Numbers: SP-159
- Files: TRIS
- Created Date: Nov 12 1996 12:00AM