Title: Shrinkage of Hardened Cement Paste at Temperatures up to 670 C (1238 F)

Author(s): W. P. S. Dias, G. A. Khoury, and P. J. E. Sullivan

Publication: Materials Journal

Volume: 87

Issue: 3

Appears on pages(s): 204-209

Keywords: cement pastes; hardened paste structure; high temperature; mathematical models; microstructure; shrinkage; water-cement ratio; Materials Research

DOI: 10.14359/2137

Date: 5/1/1990

Abstract:
The transient and ultimate shrinkage behavior of unsealed hardened cement paste of water-cement ratio (w/c) = 0.3 was investigated for maximum exposure temperatures up to 670 C (1238 F) and a heating rate of 1 C/min (1.8 F/min). The shrinkage phase, the duration of which was dependent on the maximum exposure temperature, was modeled mathematically using a combined logarithmic and exponential expression. The amount of shrinkage experienced and the temperature at which the trend of increasing ultimate shrinkage is reversed was found to depend on the w/c.