Quick setting was experienced when a particular water- reducing admixture was used with certain white cements containing less than 1.6 percent SO3. These cements set normally at normal temperature with out the admixture but set rapidly in the presence of the admixture, both at normal and at high concreting temperatures. Other cements from the same mill with higher SO3 contents gave normal setting times, both with and without the admixture and irrespective of temperature. investigation revealed that, in the presence of the admixture, consumption of SO3 was accelerated in the case of the problem cements and that insufficient SO3 remained in solution in the period immediately following mixing to properly control the hydration reactions of C3A. Other factors also were involved, such as inherent clinker reactivity and the state of dehydration of the gypsum.

Media Info

  • Media Type: Print
  • Features: Figures; References;
  • Pagination: pp 21-26
  • Monograph Title: Concrete admixtures
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00135024
  • Record Type: Publication
  • ISBN: 0309024749
  • Files: TRIS, TRB
  • Created Date: Jul 13 1976 12:00AM