الفهرس 
Concrete and environmentOnly 14 pages are availabe for public view
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Abstract
Cement concrete is often considered as an artificial stone which is made by mixing Portland cement (PC), water, sand, and crushed stone aggregate to produce a moldable mixture. Concrete is a basic product used in a variety of constructions including infrastructure and industrial sectors. But, the environmental aspects of concrete are now being discussed with a view to develop an eco-friendly construction material. Cement industry produces carbon dioxide and pollute the environment, as the greenhouse effect created by the carbon dioxide emissions led to produce an increase in the global temperature that may result in climate changes.To avoid the climate change, Geopolymers (GP) were introduced as environment friendly construction materials instead of PC composites. GP depend on two main constituents they include geopolymer source materials and alkaline activator liquids. The GP source materials should be alumino-silicate based and rich in silicon (Si) and aluminum (Al) and those by-product materials such as fly ash,silica fume, slag, rice ash husk, …etc. may be considered suitable.Most of the previous works on GP composites reveal that hardening is due to heat curing, which is considered as a limitation for cast in site application.Moreover, as the polymerization process is generally accelerated at higher temperature, this study is directed to achieve a more efficient ecofriendly geopolymer composite with the help of the hot weather conditions. In this regard,different GP composites were investigated. Mixtures constituents (fly ash,aggregate, alkaline solution with different molarities and water) as well as curing II regimes were considered. The mechanical and durability properties were studied. Moreover, the flexural performance of reinforced GP slab specimens cured with different curing regimes were conducted and compared with reinforced Protland cement concrete slabs