الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
The objective of this research program is to present many applications for recycled aggregates and powder produced by the recycling process of clay brick demolition wastes.The brick wastes were manually crushed then sorted and classified into three categories; coarse aggregates, fine aggregates and clay brick powder CBP. The effect of fine and coarse aggregates was studied on physico-mechanical properties of normal weight concrete and concrete masonry units CMUs. Also, The effect of CBP on mortar compressive strength was studied in order to investigate pozzolanic reactivity of CBP. Pastes modified with CBP were investigated using x- ray diffraction, TGA and micro-structural analysis. Results showed that the lower cement content concrete has a comparable performance to those of reference concrete. The new manufactured CMUs satisfied the requirements for non-load bearing units. The paste sample modified with 25% CBP showed smaller pore size and lower weight loss under high temperatures than reference paste. Moreover, the research program also suggests new applications of crushed clay brick in cellular concrete. Crushed clay brick was studied as an alternate aggregate in aerated
concrete. Two series of mixtures were designed to investigate the physico-mechanical properties and micro-structural analysis of autoclave aerated concrete and foamed concrete, respectively. In each series, natural sand was replaced with crushed clay brick. In both series results showed a significant reduction on unit weight, thermal conductivity and sound attenuation coefficient while porosity increased. Improvement on the compressive strength of autoclave aerated concrete was observed at a percentage of 25% and 50% replacement, while in foamed concrete no significant reduction observed at 25% clay brick
aggregate content. A comparatively uniform distribution of pore in case of foamed concrete with natural sand was observed by scanning electron microscope, while the pores were connected mostly and irregular for mixes containing a percentage higher than 25% of clay brick aggregate.