Assessment and Repair of Fire-Damaged High-Strength Concrete: Strength and Durability
Publication: Journal of Materials in Civil Engineering
Volume 19, Issue 6
Abstract
Strength and durability are two key factors influencing the safety and service life of fire-damaged concrete structures. To develop an assessment method for fire-damaged high-strength concrete (HSC) structures that is convenient for postfire repair, the effects of concrete strength and aggregate type on the postfire residual compressive strength of HSC were studied in this paper. Subsequently, the changes in durability and microstructures were investigated by the rapid chloride-ion penetrability test, the mercury intrusion porosimetry test, and scanning electron microscopy observation, respectively. Based on the test results and further analysis, estimation of the temperature distribution in the fire-damaged concrete element is established by the dichotomy and mercury intrusion porosimetry test and scanning electron microscopy observation. According to the estimated temperature distribution, the postfire residual compressive strength can be assessed by the strip method and postfire durability can be assessed by the “two-level” method, respectively. Based on the assessments, the repair method for fire-damaged HSC structures is recommended in steps.
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Acknowledgments
This research was supported by the research project “Spalling of High-Strength Concrete under Fire-Quantification and Prevention” (A/C Code: A-PD50) from the Hong Kong Polytechnic University, the National Key Technologies R&D Program “Researches on Durability and Disaster Prevention of HPC Residence” (2002BA806B-4), and Key Subject Construction in Shanghai.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 19 • Issue 6 • June 2007
Pages: 462 - 469
Copyright
© 2007 ASCE.
History
Received: May 16, 2005
Accepted: Jul 14, 2006
Published online: Jun 1, 2007
Published in print: Jun 2007
Notes
Note. Associate Editor: Zhishen Wu
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