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specimens recorded significantly higher compressive strengths when tested after 90 days compared to similar mixes cured for a period of 28 days. The strength values were approximately 50% higher than those cured for 28 days. Fraser (2008) also conducted an evaluation of the long term durability of RAC subjected to different levels of fly ash replacement in comparison to non-fly ash RAC. This was achieved by the development of an accelerating aging and testing protocol which involves the use of Arrhenius equation, Time temperature Superposition and Stepped Isothermal Methods. Compressive tests were conducted on 4” X 8” RAC cylindrical specimens before and after the accelerated aging at different temperature sequences. The results showed that the incorporation of fly ash decreased the compressive strength of the material regardless of temperature. Also, the compressive strength of the fly ash specimen increased with an increase in temperature whereas the compressive strength of the non-fly ash specimens significantly reduces as the temperature increased. In an effort to analyze the outcome of HDPE fibers on the strength and toughness of RAC, Sobhan (2002) performed a series of split tensile, compressive and flexural tests on a wide variety of design mixes. Two main scenarios were analyzed. The first scenario involved the use of Portland cement, recycled aggregates and variable sizes of HDPE fibers whereas the 2nd scenario engaged the incorporation of fly ash as partial replacement of Portland cement with similar volumes of HDPE fibers as in the first case. The HDPE fibers were obtained from recycled milk containers with dimensions of 19– 38-mm in length, 0.5-mm in thickness and having aspect ratios of 3 & 6. A complete 6PDF Image | HDPE FIBER REINFORCED RECYCLED AGGREGATE CONCRETE
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