الفهرس 
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Abstract
11 Concrete is an essential building material which is widely used in the <honstruction of infrastructures such as buildings, bridges, highways, dams. and
many other facilities. One of the ingredients usually used as a binder in the
manufacture of concrete is the Ordinary Portland Cement (OPC). The
increasing worldwide production of OPC to meet infrastructure developments
indicates that concrete will continue to be a chosen material of construction in
the future. It is well established fact that the production of Ordinary Portland
Cement (OPC) not only consumes significant amount of natural resources and
energy but also releases substantial quantity of carbon dioxide to the
atmosphere. Another alternative to make environmentally friendly concrete is
the development of inorganic alurnina-silicate polymer called Geopolymer,
synthesized from materials of geological origin or by-product materials such as
fly ash that is rich in silicon and aluminum.
This study describes the experimental work conducted by casting 20
concrete mixes to evaluate the effect of various parameters (replacement ratio,
total aggregate ratio from concrete volume and fine aggregate ratio from total
aggregate volume) affecting its mechanical properties in order to enhance its
overall performance.
The test results showed that replacement of fly ash based geopolymer
improved the mechanical properties of concrete. Compressive strength,
splitting tensile strength, flexural strength and bond strength are on higher side
for 50% replacement as compared to those produced from 0%, 25% and 75%
replacement ratios.