Effect of particle size and slag content on the early hydration of interground blended cements


Cetin C., ERDOĞAN S. T. , TOKYAY M.

CEMENT & CONCRETE COMPOSITES, vol.67, pp.39-49, 2016 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 67
  • Publication Date: 2016
  • Doi Number: 10.1016/j.cemconcomp.2015.12.001
  • Title of Journal : CEMENT & CONCRETE COMPOSITES
  • Page Numbers: pp.39-49
  • Keywords: Intergrinding, Slag, Blended, Hydration, Heat, Size, PORTLAND-CEMENT, MINERAL ADMIXTURES, INERT MATERIALS, MORTARS, PASTES, TEMPERATURE, PERFORMANCE, FINENESS, CONCRETE, HEAT

Abstract

Three blended cements prepared by intergrinding 6-35% slag with clinker and gypsum, and a control portland cement, were sieved to yield 0-10 mu m, 10-30 mu m, 30-50 mu m, and >50 mu m subgroups. Clinker/slag/gypsum contents, and oxide compositions of the subgroups differed significantly from the unsieved cements. Fine subgroups always contained more gypsum and had lower slag-to-clinker ratios than coarse subgroups. Heat evolution was investigated up to 48 h using isothermal calorimetry. Contribution of slag to early heat evolution was limited. 0-10 mu m particles evolved up to 5-10% of their heat in the first 30 min. Particle size affected the peak rate of heat evolution but not its timing. A linear relationship was observed between heat evolved from 0 to 24 h and from 24 h to 48 h. Median size or slag content of subgroups affected the positions of data points on this line. Heat evolved up to 24 h (or 48 h) was found to be closely related to particle size. Rate of heat development does not appear to be strongly influenced by particle size above -30 mu m. (C) 2015 Elsevier Ltd. All rights reserved.