Hydration hardening process control technology of low alkalinity sulphoaluminate cement

Author(s): Huaxin Zhou, Jiaping Liu, Jianzhong Liu and Changfeng Li
Paper category: conference
Book title: Microstructural-related Durability of Cementitious Composites
Editor(s): Guang Ye, K. van Breugel, Wei Sun and Changwen Miao
Print ISBN: 978-2-35158-129-2
e-ISBN: 978-2-35158-123-0
Publisher: RILEM Publications SARL
Publication year: 2009
Pages: 108 - 115
Total Pages: 8
Language: English

Abstract: The influence of borax(Na2B4O7·10H2O) and lithium compounds(LiOH·H2O) on setting time, hydration process, mechanical properties and microstructure of low alkalinity sulphoaluminate cement was studied. The quick hardening and ultra early strong model with borax as retarder was established, and the hydration hardening pocess control measures of low alkalinity sulphoaluminate cement were discussed. Results showed that, borax has a good retarding effect of low alkalinity sulphoaluminate cement, lithium compounds can effectively solve the problem of long retarding time and slow strength development based on borax retarding mechanism, borax and lithium compound only have an impact on the formation rate, not on the type of hydration products, the addition of borax and lithium compound can optimize the microstructure of hardened slurry, by reducing the total porosity and average aperture of low alkalinity sulphoaluminate cement. Therefore, the hydration exothermic chemical process and the condensation hardening process of low alkalinity sulphoaluminate cement can be controlled by appropriate amounts of borax and lithium compound.

Online publication: 2012-05-16
Publication Type: full_text
Public price (Euros): 0.00