الفهرس 
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Abstract
This work aims to study the Physico-mechanical properties of Pozzolanic cement pastes containing waste fired clay bricks (FCRBs) produced from cement industry and local kaolin from south Sinai. The kinetics of the Pozzolanic activity was followed by the determining of free lime, insoluble residue and combined water contents. XRD, DTA and TGA were carried out for some selected samples up to 90 days of hydration. Also, the effect of replacement of cement by FCRBs as well as metakaolin (MK) with 5, 10, 15 and 20 wt. % on the properties of composite cement pastes was investigated. The determination of standard water of consistency, initial and final setting times for each pozzolanic cement paste were determined. The rate of hydration of hardened cement pastes was studied by determination of chemically combined water, free lime, insoluble residue contents, bulk density and total porosity as well as compressive strength up to 90 days. It was revealed that, the mixes (10 wt% FCRBs) and (15 wt% MK) give good physico-mechanical properties. It was concluded that the addition of MK increases the standard water of consistency and elongated the initial and final setting times as well as the combined water content increases with MK content. On the other hand, the mixes (15 wt% FCRBs) and (5 wt% MK) give good physico-mechanical properties. The fire resistance of Pozzolanic and composite cement pastes prepared from FCRBs and MK was evaluated after firing at 250, 450, 600 and 800 oC for 2 hours. The Physico-mechanical properties such as bulk density, total porosity, weight loss, and compressive strength were determined at each firing temperature. It is found that the mix of (15 wt% FCRBs and 5 wt% MK) is the optimum mix for fire resistance.