الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Geopolymer concrete is considered eco-friendly concrete. In this research,
Geopolymer concrete uses recycled solid waste materials such as palm fronds
ash and red brick powder as pozzolanic materials, which contribute to minimizing CO2 emissions to the atmosphere. The main aims of this study are to study the behavior of Geopolymer concrete cast using Palm fronds ash and
red brick powder (as recycled materials) as well as study the effect of elevated
temperatures on it. The experimental program was conducted in two stages. In
the first stage, study using Palm fronds ash and red brick powder as recycled
materials was studied. The Geopolymer concrete control specimens were tested
in terms of compressive, splitting tensile, and flexural strengths at different ages. In the second stage, the effect of elevated temperatures on the behavior of this concrete type was evaluated. The samples were tested to obtain compressive and splitting tensile strength. The main variables are the effect of the elevated temperatures (200, 400, and 600oC for 2 hours) and cooling methods (air-water). The samples were heated then, the specimens were cooled by using two regimes, left in air for one day or by immerging in water for one day. Test results indicated that for specimens cooled in the air, the samples
exposed to 200 and 400oC at elevated temperatures, the compressive strength
values increased by about 7.30% and 10.15%, respectively, and the tensile
strength values increased by about 6.7% and 8.68 %, respectively. As samples
were exposed to 600°C, the compressive and splitting tensile strength decreased
by about 43.7 % and 44.65 %, respectively. For specimens cooled in water and exposed to 200 and 400oC, the compressive strength values increased by about 4.54% and 7.40%, respectively, and the tensile strength values increased by
about 4.16% and 6.5 %, respectively. In the specimens exposed to 600°C, the
compressive and splitting tensile strength decreased by about 46.2 % and 46.4 %, respectively. Geopolymer concrete is considered an environmentally friendly material. It is vailed for use as a construction material.