Abstract
The production of concrete incorporating recycled aggregate has increased steadily all over the world to conserve natural aggregate deposits. The main drawback for the bulk utilization of recycled aggregate is its characterization and proper quality control during production. This paper presents the results of a study conducted to characterize and utilize the recycled concrete aggregates (RCA) from southern Illinois as a suitable construction material. Several concrete mixes consisting of 10, 20, 30, 40, 60, and 80% replacement of natural aggregate were prepared and tested for compressive strength after curing periods of 7, 14, and 28 days, and the results were compared with 100% natural aggregate concrete. The suitability of the RCA as a granular road base material was also determined. The results show that the compressive strengths increases with various curing period for all concrete mixes. The RCA base material had lower california bearing ratio (CBR) value compared with natural crushed rock base material, i.e., class CA 06. The durability parameters of the natural and recycled aggregate samples were also investigated by using sulphate soundness and microdeval tests.
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