Investigation of Cement-Replacement Materials. Report 10. Use of Large Amounts of Possolans in Lean Mass Concrete.
Abstract
This phase of the cement-replacement materials investigation involved studies of 38 concrete mixtures, 21 proportioned with natural gravel and 17 proportioned with crushed limestone aggregate graded up to 6 in. Five mixtures contained no pozzolan and from 189 to 312 lb of portland cement per cubic yard. Thirty-three mixtures contained one bag (94 lb) of portland cement per cubic yard with various amounts of one of four pozzolanic materials. A greater weight of pozzolan than of portland cement was used in 24 of the 33 mixtures. Many of the mixtures appeared to develop ample strength and water-tightness to permit their use in the interior of dams. Preliminary calculations indicate the adiabatic temperature rise will be very low; these calculations will be verified by later testing. The data suggest that in a concrete mixture with a constant weight of portland cement per cubic yard, the optimum amount of pozzolan that can be beneficially employed to contribute to compressive strength will decrease with increasing pozzolanic activity of the pozzolan. (Author Modified Abstract)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1962
- Accession Number
- AD0756299