False Set in Portland Cement


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Title: False Set in Portland Cement

Author(s): R. F. Blanks and J. L. Gilliland

Publication: Journal Proceedings

Volume: 47

Issue: 3

Appears on pages(s): 517-532

Keywords: no keywords

Date: 3/1/1951

False set of cement causes difficulties in mixing and placing and even though the stiffening is eliminated by job conditions, extra mixing or the addition of corrective admixtures, undesireable effects on the hardened concrete remain. It adversely affects water requirement, strength, bond between aggregate and matrix, brittleness and cracking, resistance to freezing and, thawing and air-entraining charateristics. Corrective in the manufacture of the cement are proper cooling of mills or the use of stable calcium sulfate.