Kuat Tekan Beton Dengan Sebagian Agregat Kasar Cangkang Kelapa Sawit

Abstract

Kotawaringin Barat Regency is one of the largest oil palm producers in Central Kalimantan, with the land area and production continuously expanding from year to year. However, the increase in palm oil production also generates significant waste, one of which is oil palm shell (OPS) of the dura type. This waste has not been optimally utilized and has low economic value. This study aims to utilize oil palm shells as a partial replacement for coarse aggregate in concrete mixtures and to determine its effect on the concrete's compressive strength. The method used is experimental with variations in the percentage of oil palm shells at 0%, 10%, 17%, and 20%. Compressive strength tests were conducted at concrete ages of 7, 14, and 28 days.The results show that the greater the percentage of OPS used, the lower the concrete's compressive strength. For the 20% mixture, the average compressive strength of the concrete at 7 days was 28.99 MPa, at 14 days was 30.29 MPa, and at 28 days was 30.99Mpa. The average compressive strength of the concrete was only 11.34 MPa, experiencing a decrease of about 60.88% from normal concrete at 7 days. The average compressive strength of the concrete was only 12.89 MPa, experiencing a decrease of about 57.44% from normal concrete at 14 days. The average compressive strength of the concrete was only 13.38 MPa, experiencing a decrease of about 56.82% from normal concrete at 28 days. This indicates that for concrete quality f'c 30MPa, oil palm shells are less effective as a significant replacement for coarse aggregate. Nevertheless, the use of oil palm shells still has potential from an environmental and cost efficiency perspective, especially for lightweight concrete applications.