Durability of concrete with pitchstone fines as a partial cement replacement

Tuladhar, Rabin, Sexton, Aaron, and Joyce, Paul (2013) Durability of concrete with pitchstone fines as a partial cement replacement. In: Proceedings of Concrete Institute of Australia’s Biennial National Conference. From: Concrete 2013: Concrete Institute of Australia’s Biennial National Conference, 16-18 October 2013, Gold Coast, QLD, Australia.

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Abstract

Pitchstone is primarily used to produce perlite for chemical, textile and construction industries. In North Queensland, more than 100 million tonnes of pitchstone deposit exists. While processing pitchstone to produce perlite, more than 30% of the material is crushed into fine stone-dust called as pitchstone-fine (PF). At present, this stone-dust is a mining waste and has no economic value. Recent researches have proved that PF has pozzolanic properties and can be used in concrete as a cement replacement. This paper investigates the durability of concrete with PF using rapid chloride penetration test (RCPT).

RCPT determines the electrical conductance of concrete which indicates its resistance to penetration of chloride ions. In this study, RCPT was carried out on 28, 56 and 77-days on concrete specimens with 10, 20 and 30% PF replacement of cement. The results were compared with the control mix consisting of 100% portland cement. The results from RCPT showed that with the increase in PF content, the total charge passed through the concrete specimen significantly dropped. This indicates that the durability of concrete improved with the higher content of PF. The compressive strengths obtained for 10 and 20% PF replacement were also in par with the control specimen.

Item ID: 32142
Item Type: Conference Item (Refereed Research Paper - E1)
Keywords: supplementary cementitious materials, durability, RCPT, pitchstone fine
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ISBN: 978-1-877040-73-3
Date Deposited: 22 May 2014 02:38
FoR Codes: 09 ENGINEERING > 0905 Civil Engineering > 090503 Construction Materials @ 50%
09 ENGINEERING > 0905 Civil Engineering > 090506 Structural Engineering @ 50%
SEO Codes: 87 CONSTRUCTION > 8703 Construction Materials Performance and Processes > 870301 Cement and Concrete Materials @ 100%
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