Durability characteristics of self-compacting concrete incorporating pumice and metakaolin

Mehrinejad Khotbehsara, Mojdeh and Mohseni, Ehsan and Ozbakkaloglu, Togay and Ranjbar, Malek Mohammad (2017) Durability characteristics of self-compacting concrete incorporating pumice and metakaolin. Journal of Materials in Civil Engineering, 29 (11). ISSN 0899-1561

Abstract

In this study, the effects of pumice and metakaolin (MK) on the durability and microstructural properties of self-compacting concrete (SCC) are investigated. A total of 10 mixtures including different pumice and MK contents as cement replacement [0–15 and 0–10 by weight % (wt.), respectively] were designed. Fresh concrete tests, including slump flow, visual stability index, T50, V-funnel, and L-box, were carried out. Compression tests were performed to determine the mechanical properties. Water absorption, electrical resistivity, and rapid chloride permeability (RCP) tests were performed to assess durability properties. The microstructure of SCCs was studied via scanning electron microscope (SEM) images. The workability of SCC mixtures containing pumice and MK generally satisfied the fresh-state
behavior requirements. With the inclusion of pumice, the compressive strength decreased at 28 days, whereas it increased significantly at 90 days. Most of the binary mixtures displayed strength enhancement over the control mix at ages of 28 and 90 days, and this improvement was more significant at 90 days. The SEM micrographs illustrated the packed pore structure of samples containing MK and pumice, which promoted the strength and durability properties of these mixes. The results suggest that, in general, the combined use of 10 wt.% pumice and 10 wt.% MK provides a suitable replacement ratio that enhances both the durability and mechanical properties of SCC.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying
Date Deposited: 11 Dec 2017 22:42
Last Modified: 11 Dec 2017 22:42
Uncontrolled Keywords: self-compacting concrete; pumice; metakaolin; compressive strength; durability; electrical resistivity
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090503 Construction Materials
Identification Number or DOI: 10.1061/(ASCE)MT.1943-5533.0002068
URI: http://eprints.usq.edu.au/id/eprint/33111

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