Influence of particle size distribution of slag, limestone and fly ash on early hydration of cement assessed by isothermal calorimetry

Author(s): Yury Villagrán Zaccardi, Elke Gruyaert, Natalia Alderete, Nele De Belie
Paper category: Proceedings
Book title: Proceedings of the International RILEM Conference
Materials, Systems and Structures in Civil Engineering 2016
Segment on Concrete with Supplementary Cementitious Materials
Editor(s): Ole M. Jensen, Konstantin Kovler and Nele De Belie
ISBN:978-2-35158-178-0
e-ISBN: 978-2-35158-179-7
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 44-53
Total Pages: 10
Language : English

Abstract: Supplementary cementitious materials (SCMs) enhance early hydration of cement through the provision of nucleation sites for the precipitation of hydration products. This effect contrasts with the dilution effect of the mineral addition to the cementitious system. In fact, the net effect on heat release during the first hours of hydration is the reduction of peak intensity. Then, only when the specific heat is evaluated in terms of cement weight the actual effect of the admixture on hydration may be assessed. In this sense, a clear difference may be expected in accordance with the replacement ratio and fineness of the SCM. Increased specific surface favors nucleation and it therefore enhances hydration. In this paper, cement pastes admixed with slag, limestone and fly ash in three different fineness levels and three replacing ratios were investigated through isothermal calorimetry. The filler effect of each SCM was in relation with the fineness and replacing ratio, with higher impact on the aluminate reaction
than on the silicate reaction of cement.

Online publication : 2016
Publication type : full_text
Public price (Euros) : 0.00