Hardened and transfer properties of self-compacting concretes containing pre-coated rubber aggregates with crushed dune sand

摘要

Many researchers believe that the adhesion failure between rubber and cement paste is one of the main reasons the strength of concrete containing these aggregates drops sharply. This paper provides strength and durability experiment results which reveal the effect of pre-coating rubber granules with crushed dune sand in terms of their mechanical performance, these tests aimed to enhance the durability properties of self-compacting concretes (SCC) transfer properties and structure. Results show that mechanical properties of SCC made with treated rubber granules are improved compared with concrete mix made with the untreated rubber. Natural sand is replaced with 2.5% of rubber granules pre-coating with (0-20%) of crushed dune sand as partial replacement of cement. The compressive strength of SCC rises with the proportionate increase of the crushed dune sand percentage. This could confirm the strengthening of the transition zone (between cement paste and rubber aggregate) by introducing siliceous additions with high fineness.