Title:
Admixture-Cement Incompatability: A Case Hstory
Author(s):
Colin D. Johnston
Publication:
Concrete International
Volume:
9
Issue:
4
Appears on pages(s):
51-60
Keywords:
admixtures; air entrainment; compressive strength; lignosulfonate; mass concrete; portland cement compound composition; setting (hardening); sulfate resisting cements; water-reducing agents; Materials Research
DOI:
Date:
4/1/1987
Abstract:
Describes investigation of the causes of a problem of severe set retardation and suppressed strength development in one of a series of mass concrete placements. Written records and verbal recollections were examined and investigative testing was undertaken. Set retardation was attributed to the combined effects of high doses of lignosulfonate and high-range water reducer acting on one or both sources of Type V cement. Suppressed strength development was attributed primarily to an overdose of the lignosulfonate water reducer.