Hits:

Indexed by:期刊论文

Date of Publication:2008-02-01

Journal:JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION

Included Journals:SCIE、EI、ISTIC

Volume:23

Issue:1

Page Number:85-88

ISSN No.:1000-2413

Key Words:nano-SiO2; high-performance concrete; freezing resistance

Abstract:The test of fast-freezing method is employed to research the freezing resistance of C60 and C80 high-performance concrete with nanometer-SiO2, and XRD and SEM are employed to analyze the mechanism of its influence. The experimental results show that the freezing resistance of high-performance concrete has been effectively improved. The compressive strength of C60, C70 and C80 high-performance concrete added with nano-SiO2 can be improved by 8%, 6% and 5% respectively, the weight loss can be reduced by 1%, 0.6% and 0.3% respectively and the relative dynamic elastic modulus can be improved by 7%, 4% and 6% respectively after the 300 times freeze-thaw cycle.