The use of Palm Oil Ash in High Strength Concrete

Abstract

This study aimed to study partial substitution of Portland cement type 1 with the oil palm ash (OPA) in High Strength Concrete (HSC). The assigned HSC in this experiment was set up at the compressive strength of 500 ksc at 28 days, the water binder ratio (W/B) of 0.33 and using a special dewatering concrete admixture the (Concrete Admixture Type F or Superplasticizer) at 2.5 % by weight of binder. The substitution rate of oil palm ash was 10%, 15% and 20% by weight of binder material and the compressive strength was tested at 1, 7, 14, 28 and 90 days. The results revealed that decreasing the concrete workability was found with increasing the ratio of oil palm ash when compared with Portland cement type 1 using as a control. The density and compressive strength of concrete at 1, 7, and 28 days were gradually decreased with increasing the ratio of oil palm ash.  Lower compressive strength of concrete replaced by oil palm ash at the ratio 10%, 15% and 20% was lower than the control concrete. However, similar compressive strength at 90 days was found in all treatments in comparison with the control concrete. The compressive strength was 605, 595 and 623 kg/cm² or equal to 98%, 98% and 105% of control concrete using Portland cement               type 1, respectively.