lump and Compressive Strength of Concrete Containing Recycled Aggregate and Lime Stone Dust
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Abstract
This research is to study the workability and compressive strength of concrete containing recycled aggregate and lime stone dust. Recycled aggregate (RCA) is used to replace crushed stone was 70%, 80%, 90% and 100% by volume of total coarse aggregate. Lime stone dust (CD) is used to replace river sand was 70%, 80%, 90% and 100% by volume of total fine aggregate. The water to binder ratio = 0.65 was used. Compressive strength was determined at the ages of 1, 3, 7, 14, 21 and 28 days by using concrete cylinder (dimension was 150 millimeter in diameter and 300 millimeter in height) for testing. The results show that, workability of concrete was decreasing, when the amount of CD to be increasing, while workability of concrete was slightly increased, when the amount of RCA to be increasing. For the compressive strength of concrete at the ages of 28 days, the tendency was to be decreasing, when the amount of RCA to be increasing. For the amount of CD in concrete lower than 80%, compressive strength was tending to increasing. While the amount of CD in concrete more than 80%, compressive strength was decreased. In addition, the tendency of the compressive strength development of concrete with RCA and CD was similar to conventional concrete (concrete without RCA and CD).
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