THERMO-CHEMICAL STABILITY AND MECHANICAL PROPERTIES OF MORTAR MADE WITH CEMENT KILN DUST- BLENDED CEMENT

Document Type : Original Article

Authors

1 Engineering Materials Dept, Zagazig University, Zagazig, Egypt.

2 Chemistry Department, Faculty of Science, Zagazig University, Egypt.

Abstract

The aim of the present investigation is to study the effect of elevated temperature on the
mineralogical structure, chemical characteristics and mechanical properties of mortar prepared
from cement kiln dust -blended cement with proportion 5, 10, 15, 20% of two types of cement
(OPC and BFSC). Cubical samples were cast, molded and cured under tap water for 28 days and
then left in air under normal atmospheric conditions for about three years. These samples were
subjected to elevated temperature: 300, 400, 500 and 600 °C for 2 hrs, then the compressive
strength variation of the hardened samples were studied. Weight loss and X-Ray diffraction
analysis were also used to investigate the phase transformations in these materials. Visual
observation of macro-cracks created due to heating and the carbonation depths were also
identified. Results of this investigation showed that, mortar strength is affected and gradual break
down is observed, at temperatures up to 600°C, as well as with increasing of the blended cement
kiln dust percent. The carbonation depth demonstrated by Ph.Ph. test for OPC-CKD is more than
in case of BFSC-CKD blends especially at high temperature. The hardened mortars made with
BFSC gives a thermal stability more than that in case of OPC samples.

Keywords

ERJ. Engineering Research Journal
Volume 27, Issue 1
January 2004
Pages 49-58

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