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ABSTRACT
Recycled aggregates have an essential role in constructing construction activities today to save natural aggregates because of industrial development. This project aims to find the effects of pretreated of recycled coarse aggregate using supluric acid and water on compressive strength and water absorption by partial replacement of natural coarse aggregates (NCA). Two replacement percentages were used to study the effect of replacement. Replacement percentages used were 15% and 30% with 0% replacement was used as control. Mix design of 1:1.56:2.6 was used in the study with water to cement ratio of 0.44. Influence of RCA on compressive strength was determined for all the mixes as per ASTM C39 standard. The permeability of all the mixes was determined by measuring water absorption for the different mixes. Results of compressive strength indicated that concrete with 15% replacement of NCA which was treated with both water and sulphric acid can be successfully used in structural concrete without compromising too much on strength. Whereas, the replacement of natural aggregates with RCA has a negative impact on the permeability of concrete at all replacement levels. Absorption was lowest for RCA with 15% replacement pretreated with water
