Hydration of Portland cement blended with blast furnace slag at early stage

Title: Hydration of Portland cement blended with blast furnace slag at early stage
Author(s): J. Zhou, Ye Guang, K. van Breugel
Paper category : conference
Book title: 2nd International RILEM Symposium on Advances in Concrete through Science and Engineering
Editor(s): J. Marchand, B. Bissonnette, R. Gagné, M. Jolin and F. Paradis
Print-ISBN: 2-35158-003-6
e-ISBN: 2351580028
Publisher: RILEM Publications SARL
Publication year: 2006
Nb references: 15
Language: English

Abstract: In this study, the hydration process of Portland cement (PC) blended with 0-90% blastfurnace slag (BFS) with the water/solid (w/s) ratios of 0.4 and 0.5 was investigated by isothermal conduction calorimeter and scanning electron microscopy (SEM). Experimental results indicate that the hydration of C3S and C3A was accelerated by the BFS. It is mainly due to the “effect of dilution”, the consumption of calcium hydroxide (CH) by BFS and more nucleation site for the formation of CH provided by BFS particles. The reaction of BFS and CH leaded to the occurrence of the peak S in isothermal conduction calorimeter curves.
SEM images show that the content of CH was low in PC pastes blended with BFS. Most CH crystals were formed around BFS particles at voids between large PC particles. The results of this investigation show that the microstructure of cement pastes can be modified by changing the amount of blended materials.

Keywords: Hydration, hydration product, Blastfurnace slag, Portland cement

Online publication: 2006-08-02
Classification: 3.2 Theme 2: From Fresh to Hardened Concrete
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2351580028.085