Preliminary communication

https://doi.org/10.17559/TV-20140327212200

Modifications of dolomite-based self-compacting concrete properties using mineral additives

Marija Jelčić Rukavina ; Sveučilište u Zagrebu, Građevinski fakultet, Kačićeva 26, 10000 Zagreb, Croatia
Ivan Gabrijel ; Sveučilište u Zagrebu, Građevinski fakultet, Zavod za materijale, Kačićeva 26, 10000 Zagreb, Croatia
Dubravka Bjegović ; Sveučilište u Zagrebu, Građevinski fakultet, Zavod za materijale, Kačićeva 26, 10000 Zagreb, Croatia

Abstract

This paper addresses fresh and hardening properties of self compacting concretes (SCC) made with dolomite filler and pozzolanic materials, fly ash and matekaolin as cement replacement in different amounts. For this study, seven mixtures were prepared with a constant water-to-powder ratio and powder content. Fresh SCC properties were assessed by means of slump flow, L-box and sieve segregation test, while hardened properties were evaluated by means of compressive strength and modulus of elasticity at ages of 2, 7, 14, 28 and 365 days. In addition, the activity of mineral additives was assessed by heat of hydration measurement. Obtained results showed that mixtures containing fly ash exhibited better performance concerning workability properties needed for SCC, while cement replacement with metakaolin enhanced the mechanical properties. Slower pozzolanic activity of fly ash reflected in slower strength development, but ultimate strength obtained at the age of 365 days was not reduced by the presence of fly ash.

Keywords

dolomite filler; fly ash; fresh properties; hardened properties; metakaolin; mineral additives; self-compacting concrete

Hrčak ID:

135086

URI

https://hrcak.srce.hr/135086

Publication date:

23.2.2015.

Article data in other languages: croatian

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