Title:
Theory of Concrete Slump Loss as Related to the Use of Chemical Admixtures
Author(s):
L. M. Meyer and W. F. Perenchio
Publication:
Concrete International
Volume:
1
Issue:
1
Appears on pages(s):
36-43
Keywords:
admixtures; aggregates; air entrainment; alkalies; calcium chlorides; failure; mix proportioning; modulus of elasticity; pozzolans; quality control; tests.
DOI:
Date:
1/1/1979
Abstract:
Slump loss occurs in all concretes. The rate of slump loss can be greatly increased in some cases when a chemical admixture is used. This paper presents a brief state-of-the-art summary and a report on an investigation in progress on this subject. Chemical and physical tests of portland-cement pastes, mortars, and concretes are described. Slump loss is tentatively ascribed to the forms of calcium sulfate in the cement and the interaction of this sulfate with the aluminate phases. These interactions are shown to be affected by the introduction of various types of chemical admixtures to a portland cement-water system.