Influence of cement kiln dust substitution on the mechanical properties ofconcrete

Large quantities of cement kiln dust (CKD) are produced during the manufact ure of cement clinker by the dry process. The technical and economical prob lems that arise for the semi-manufacture of raw materials used, energy and transportation of dust from the plant to outside, as well as the severe pol lution to the surrounding atmosphere show the necessity of utilizing cement dust as one of the main objectives of our investigation. The cement dust c ontains a mixture of raw feed as well as calcined materials with some volat ile salts. The aim of the present work is to study the effect of cement dus t substitution instead of ordinary Portland cement (OPC), blast furnace sla g cement (BFSC), and sulphate resistance cement (SRC) on the mechanical pro perties of some concrete mixes containing them, and also, to determine the optimum quantity of CKD which could be recycled in the manufacture of these types of cements. Useful conclusions and recommendations concerning the us e of different amounts of CKD in the production of some blended cements as a partial substitution from different types of cements were obtained. (C) 2 000 Elsevier Science Inc. All rights reserved.