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|Title||Using of Recycled Aggregate in Producing Concrete Elements|
This thesis aimed to find the potential of using recycled aggregate as course aggregate in the production of concrete blocks and interlocks for roads. Various percentages of recycled aggregate and natural aggregate (0%, 30%, 60% and 100%) and different water cement ratios ( 0.35, 0.42, and 0.50 ) were used to find the optimum percentage of recycled aggregate and water cement ratio to produce optimum physical, chemical and mechanical properties . The experimental test focused on physical properties of recycled aggregate; density, unit weight, sieve analysis, Los Angles test and specific gravity. Tests also performed to find the effects of the temperature on recycled aggregate by testing 60 concrete cubes (100*100*100mm) casted by using different percentages of recycled aggregate ( 0% , 30%, 60% and 100% ) at different temperatures (20°C,200°C,400°C,600°Cand800°C). Tests have also been performed on 96 concrete block samples at 7 days and 28 days for compressive strength, absorption capacity and durability test by immersion of 12 concrete blocks in sea water for 150 days to find the effects of sea water on concrete block, thus checking the expected reaction between contaminants of recycled aggregate and salts in sea water. Test also performed on laboratory fabricated 24 interlock samples. Standard tests were performed such as: 28 days compressive strength, absorption capacity, abrasion tests, unit weight and moisture content. It was concluded that concrete blocks can be produced using 100% recycled aggregate and used for practical application. Compressive strength of 4.3 Mpa can be produced using 100% recycled aggregate at 0.42 w/c ratio. According to the Palestinian Draft Specification, a block compressive strength of 3.5 Mpa is the minimum requirement. The reduction in interlock compressive strength when using 100% recycled aggregate content was 25 %. Interlock with 32 Mpa compressive strength can be produced by using 100% recycled aggregate. It can be used for paving sidewalks and pedestrian roads. Salt in sea water does not have any effect on block compressive strength after 150 day immersion in sea water. The fire-resistant property of the recycled concrete is not considered to be significantly different from that of ordinary concrete. It was indicated from this results that fire resistance of recycled aggregate concrete is as good as natural aggregate concrete.
|Publisher||the islamic university|
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