In this study, ground rice husk–bark ash (RHBA) was used as a pozzolanic material in concrete containing high amount of recycled
aggregates. The concretes were prepared by using 100% of recycled coarse aggregate (RCA), then river sand was replaced by recycled fine
aggregate (RFA) at 0%, 50%, and 100% by weight of the fine aggregate (river sand plus recycled fine aggregate). The results revealed that
recycled aggregate concretes had lower compressive strength than that of the conventional concrete (concrete made from normal aggregates).
In addition, the use of ground RHBA in recycled aggregate concrete gave higher compressive strength than the recycled aggregate
concrete without ground RHBA even though it increased the slump loss of concrete. The splitting tensile strength of the recycled aggregate
concrete was 8.15% of the compressive strength. Finally, the modulus of elasticity of recycled aggregate concrete was lower than that
of the conventional concrete and was about 4% lower than the value predicted by ACI 318.
In this study, ground rice husk–bark ash (RHBA) was used as a pozzolanic material in concrete containing high amount of recycledaggregates. The concretes were prepared by using 100% of recycled coarse aggregate (RCA), then river sand was replaced by recycled fineaggregate (RFA) at 0%, 50%, and 100% by weight of the fine aggregate (river sand plus recycled fine aggregate). The results revealed thatrecycled aggregate concretes had lower compressive strength than that of the conventional concrete (concrete made from normal aggregates).In addition, the use of ground RHBA in recycled aggregate concrete gave higher compressive strength than the recycled aggregateconcrete without ground RHBA even though it increased the slump loss of concrete. The splitting tensile strength of the recycled aggregateconcrete was 8.15% of the compressive strength. Finally, the modulus of elasticity of recycled aggregate concrete was lower than thatof the conventional concrete and was about 4% lower than the value predicted by ACI 318.
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