الفهرس 
AbstractOnly 14 pages are availabe for public view
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Abstract
The huge amount of waste crushed clay bricks (CCB) causes serious environmental problems worldwide. To deal with this issue and preserve natural resources, CCB can be recycled and reused in the concrete industry. This study investigated the influence of using CCB as substitution of cement and aggregates on the physical, mechanical, and microstructural properties of concrete. The effect of adding the air-entraining agent on the physical, mechanical, and microstructural properties of concrete was studied. Sixteen mixtures were prepared and tested to achieve the objectives of the study. Several experiments have been performed to assess the performance of the concrete. The fresh concrete has been examined to measure its workability and fresh density. For concrete hardened properties evaluation, the dry density, air density, compressive strength, ultrasonic pulse velocity, open porosity, and total porosity of the concrete have been investigated. The thermal conductivity of concrete was measured to assess the insulation characteristics of the produced concrete. The durability-related properties have been evaluated by measuring the sorptivity and water penetration depth of the concrete. In addition, scanning electron microscopy, X-ray diffraction, and thermo-gravimetric analysis were implemented to analyze the morphology and microstructure characteristics of concrete. The experimental results indicated that CCB can be reutilized as a replacement of normal-weight aggregates to obtain structural lightweight aggregate concrete with appropriate properties. It was also proved that grinded CCB has a proper pozzolanic activity and can be used as supplementary cementitious material to reduce cement content without significant deterioration of concrete properties. The results also showed that the use of grinded CCB as filler material enhances the mechanical and durability-related properties of the concrete. In contrast, adding air-entraining agent reduced these properties but its use enhances the thermal and sound insulation of the concrete.