A STUDY OF THE COMPRESSIVE STRENGTH OF CONCRETE WITH BOTTOM ASH AS PARTIAL REPLACEMENT FOR FINE AGGREGATE: A CASE STUDY WITH A CONSTANT WATER CEMENT RATIO AND A CONSTANT SLUMP VALUE
Keywords:
Bottom ash, Compressive strength, Internal curingAbstract
This research aims to investigate the compressive strength of concrete using coal bottom ash as a replacement for fine aggregate. In this case study, the researchers fixed the water-to-cement ratio and the slump value. They designed concrete with a water-to-cement ratio (W/C) of 0.55 and used coal bottom ash in a saturated surface dry condition to replace fine aggregate at percentages of 0%, 10%, 20%, 30%, 50%, and 100% by volume. The results revealed that when the water-to-cement ratio was fixed, the slump value significantly increased with the increasing percentage of coal bottom ash, and the compressive strength was higher than that of the control concrete when the replacement of fine aggregate did not exceed 30%. In cases where the slump value of the concrete was fixed, excess water flowed out of the coal bottom ash during the mixing process. To achieve a slump value equivalent to the control concrete, reducing the amount of water used in concrete mixing was necessary. From the test results, it was found that the compressive strength of concrete at all replacement percentages was higher than that of the control concrete.
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