THE INFLUENCE OF CEMENT BYPASS DUST ON THE PROPERTIES OF CEMENT CURING UNDER NORMAL AND AUTOCLAVE CONDITIONS

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THE INFLUENCE OF CEMENT BYPASS DUST ON THE PROPERTIES OF CEMENT CURING UNDER NORMAL AND AUTOCLAVE CONDITIONS

Journal Title: Structure and Environment - Year 2019, Vol 11, Issue 1

Abstract

This paper analyses the properties of cement binders composed with cement CEM I 42.5R and cement bypass dust in amount of 0.5, 1.0 and 5.0% by mass of binder, curing under standard and additionally autoclave conditions. The bypass dust increases the water content for standard consistency and delays the initial setting time of binder. The cement paste containing 5% of dust reveals the change in volume by 6 mm according to Le Chatelier test. After 2 days, the compressive strength of cement mortar containing bypass is comparable to that of Portland cement mortar, but at later time the strength development of this cement binder is slower. The addition of cement bypass dust in amount to 1% can obtain the cement of strength class of 42.5R according to standard PN-EN 197-1. The autoclave curing improves the compressive strength of cement mortar. The SEM/EDS observations confirm the presence of low crystalline C-S-H gel and well-formed tobermorite fibres in autoclaved cement mortar containing 5% of cement bypass dust.

Authors and Affiliations

EWELINA TKACZEWSKA

Keywords

cement bypass dust curing condition standard consistency initial setting time soundness compressive strength SEM/EDS analysis

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EP ID EP546541
DOI 10.30540/sae-2019-001
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