Effect of cumulative lightweight aggregate volume in concrete on its resistance to chloride-ion penetration

Liu, X. M. & Zhang, M. H. (2008) Effect of cumulative lightweight aggregate volume in concrete on its resistance to chloride-ion penetration. In Limbachiya, Mukesh C. & Kew, Hsein Y. (Eds.) Excellence in Concrete Construction through Innovation, Taylor and Francis Group, Kingston University, London, pp. 175-180.

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Abstract

This paper presents an experimental study on the resistance of lightweight aggregate concretes to chloride-ion penetration in comparison to that of normal weight concrete of similar w/c. Salt ponding test (based on AASHTO T 259), rapid chloride permeability test (ASTM C 1202) and rapid migration test (NT Build 492) were carried out to evaluate the concrete resistance to the chloride-ion penetration. Results indicate that in general the resistance of the LWAC to the chloride-ion penetration was in the same order as that of NWAC of similar w/c. However, the increase in cumulative LWA volume and the incorporation of finer LWA particles led to higher charge passed, migration coefficient, and diffusion coefficient. Since the LWACs had lower 28-day compressive strength compared with that of the NWAC of similar w/c, the LWACs may have equal or better resistance to the chloride-ion penetration compared with the NWAC of equivalent strength. The trend of the resistance of concretes to chloride-ion penetration determined by the three test methods was reasonably consistent although there were some discrepancies due to different test methods.

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ID Code: 60651
Item Type: Conference Paper
Refereed: Yes
Keywords: concrete, lightweight aggregate, chloride ion, ponding, internal curing, migration, permeability
DOI: 10.1201/9780203883440
ISBN: 9780415475921
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > CIVIL ENGINEERING (090500) > Civil Engineering not elsewhere classified (090599)
Divisions: Current > Schools > School of Civil Engineering & Built Environment
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2008 Taylor and Francis Group
Deposited On: 06 Jun 2013 06:26
Last Modified: 30 Aug 2013 03:06

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