Work

Cracking and Chemical Composition of Cement Paste Subjected to Heating and Water Re-Curing

Year: 2016

Type: article

Abstract: Water re-curing of fire-damaged concrete may reduce the environmental and economic impacts of repair operations by re-using the existing concrete.To clarify the rehydration mechanism, the effects of water re-curing on the microstructure and chemical properties of fire-damaged cement paste were examined.Analysis by X-ray CT showed that heating led to radial cracks that propagated horizontally and vertically in the cement paste specimen.Water supply led to a growth in the cracked space through an increase in the connectivity of the crack network.This growth may be due to expansion caused by the rehydration of CaO into Ca(OH) 2 .Chemical analyses suggest that the rehydration reaction differs from the initial hydration in that C 2 S plays a greater role in generating C-S-H gel during the earlier period of water re-curing.

Source: Journal of Advanced Concrete Technology

DOI: 10.3151/jact.14.134

Authors: Michael Henry, Katsufumi Hashimoto, Ivan Sandi Darma, Takafumi Sugiyama

Institution: Hokkaido University

Language: English

Topic: Fire effects on concrete materials

Subfield: Civil and Structural Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: diamond

Funder: Japan Society for the Promotion of Science

Award: Development of an innovative inspection and soundness diagnosis method for concrete structures using perspective technology