Excitation mechanism of alkaline condition on the hydration activity of steel slag

Title: Excitation mechanism of alkaline condition on the hydration activity of steel slag
Author(s): Q. Wang, P.Y. Yan, J.J. Feng
Paper category : conference
Book title: International RILEM Conference on Advances in Construction Materials Through Science and Engineering
Editor(s): Christopher Leung and K.T. WAN
ISBN: 978-2-35158-116-2
e-ISBN: 978-2-35158-117-9
Publisher: RILEM Publications SARL
Publication year: 2011
Pages: 643 - 650
Total Pages: 8
Nb references: 18
Language: English

Abstract: Steel slag is a potential source of mineral admixture for concrete due to its certain cementitious properties. The use of slag as a cementing component should be preferentially considered. The aim of this research is to investigate the excitation mechanism of alkaline condition on the hydration activity of steel slag. The results show that the activity of RO phase (CaO-FeO-MnO-MgO solid solution) and Fe3O4 is very low, and these phases still show ultra low reaction extent even under strong alkaline condition. Silicates and aluminates are the main cementitious phases in steel slag, but their activity is much lower than that of Portland cement, especially at the early ages. OH- is helpful to disintegrate vitreous composition in steel slag. Thus alkalinity condition is able to excite the early activity of silicates and aluminates. The excitation effect is more obvious with the increase of pH value of alkalinity condition within 28 days. However, at late ages, the excitation effect of alkalinity condition on steel slag decreases. The enhancement of increasing pH value to excitation effect is not very important.

Online publication: 2011-10-31
Publication type : full_text
Public price (Euros): 0.00