Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/10030
Title: Deterioration and recovery of metakaolin blended concrete subjected to high temperature
Authors: Poon, CS 
Azhar, S
Keywords: Blended cement
Concrete
Fly ash
High temperature properties
Metakaolin
Porosity
Silica fume
Issue Date: 2003
Publisher: Kluwer Academic Publ
Source: Fire technology, 2003, v. 39, no. 1, p. 35-45 How to cite?
Journal: Fire Technology 
Abstract: The deterioration and spalling frequency of metakaolin (MK) blended concrete subjected to high temperature is analyzed and compared with the equivalent silica fume (SF), fly ash (FA) and pure OPC concretes. Normal and high strength concrete mixes incorporating 0-20% MK were prepared and exposed to a series of high temperatures till 800°C. The residual compressive strength, porosity and pore size distribution were determined. It was found that after an increase in compressive strength at 200°C, the MK concrete suffered a more severe loss of compressive strength and permeability-related durability than the corresponding SF, FA, and pure OPC concretes at higher temperatures. Explosive spalling was observed in both normal and high strength MK concretes, and the frequency increased with higher MK contents. It is concluded that the dense micro-structure and low porosity are the main reasons of the poor performance of MK concrete at high temperature. The effect of post-fire curing on the strength and durability recovery of fire-damaged concrete was also investigated. The test results indicated that the post-fire curing, results in substantial strength and durability recovery, and its extent depends upon the types of concrete, exposure temperature, method, and duration of re-curing.
URI: http://hdl.handle.net/10397/10030
ISSN: 0015-2684
DOI: 10.1023/A:1021775110075
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