THE INFLUENCE OF RETARDING ADMIXTURES ON THE DRYING SHRINKAGE OF CONCRETE
Concretes were made containing six bags of cement per cubic yard, five retarding admixtures plus control, and at slumps of two or six inches. The admixtures were a lignosulfonate, a hydroxyacid, and a carbohydrate proprietary materials and glycolic acid and sucrose. The hardened concretes were dried at 73 F and 50 percent relative humidity. Shrinkage was determined at times from 7 days to 6 months. There were no sytematic differences in the maxium shrinkage values except that those for concrete containing the hydroxyacid retarder were slightly lower than the others. The shrinkage-log time data seem, in most cases, to be reasonably well represented by two straight lines breaking at the 28-day value. It is concluded that the influence of these retarders on shrinkage of concrete is not significant to engineering considerations.
- Research Sponsored by Indiana State Highway Commission in cooperation with FHWA.
Purdue University/Indiana Department of Transportation JHRPPurdue University, School of Civil Engineering
West Lafayette, IN United States 47907-1284
- Dolch, W L
- Scholer, C F
- Publication Date: 1974-8
- Pagination: 14 p.
- TRT Terms: Admixtures; Carbohydrates; Concrete; Drying; Hydroxides; Lignosulfonate; Retarders (Chemistry); Shrinkage
- Subject Areas: Highways; Materials;
- Accession Number: 00083591
- Record Type: Publication
- Source Agency: Federal Highway Administration
- Report/Paper Numbers: Intrm Rpt.
- Contract Numbers: 1(10) Part II
- Files: TRIS, USDOT
- Created Date: Apr 8 1975 12:00AM