THE INFLUENCES OF RETARDING ADMIXTURES ON VOLUME CHANGES OF CONCRETE
A study was made of the effect of 65 different chemical compounds and of three different ASTM Type D admixtures on the characteristics of cement pastes in both fresh and hardened conditions. Setting times, molecular configuration related to the effectiveness of the retarders, oven dry shrinkage, non-evaporable water and the specific surface area were determined for these admixtures. Concrete specimens were prepared to evaluate the long-term drying shrinkage of the proprietary admixtures which had been evaluated as pastes. Long term shrinkage of concrete was not appreciably affected by the admixtures tested. Plastic drying shrinkage of paste was evaluated from the completion of mixing until approximately initial set. The proprietary varieties of admixtures were used in this investigation. The amount of plastic shrinkage varied with the variety of admixture and an interaction was found between admixture variety and drying condition (humidity).
- Prepared in cooperation with Federal Highway Administration, Washington, D.C. and Indiana State Highway Commission, Indianapolis.
Purdue University/Indiana Department of Transportation JHRPPurdue University, School of Civil Engineering
West Lafayette, IN United States 47907-1284
Washington, DC United States 20590
Indiana State Highway CommissionIndianapolis, IN United States 46204
- Scholer, C F
- Publication Date: 1975-10-1
- Pagination: 35 p.
- TRT Terms: Admixtures; Cement additives; Cement paste; Concrete; Drying; Moisture content; Retarders (Chemistry); Setting (Concrete); Shrinkage
- Uncontrolled Terms: Setting time
- Subject Areas: Geotechnology; Highways; Materials;
- Accession Number: 00137362
- Record Type: Publication
- Source Agency: National Technical Information Service
- Report/Paper Numbers: JHPR-75-21 Summ. Rpt.
- Files: TRIS, USDOT
- Created Date: Sep 16 1977 12:00AM