Pengaruh Pemanfaatan Pecahan Cangkang Kerang Sebagai Pengganti Agregat Halus Terhadap Uji Kuat Tekan Beton

Green concrete is a concrete composed of materials that do not damage the environment. One of them is in the form of a concrete aggregate replacement material that does not damage the environment. The high level of development in the present makes the level of development of the use of concrete increasingly high. So that many innovations are carried out as a substitute for concrete material. In this case, one of the waste which is not utilized is the conch shell. So far, most people, especially in the village of Panipahan, Rokan Hilir only use shellfish meat while shellfish shells have not been used optimally. The purpose of this study was to determine the effect and effectiveness of the utilization of shell shell shards on the compressive strength of the plan by 20 MPa with the percentage of shell shell shards of 0%, 10%, 20%, 30%, 40%, 50%, 60%, 70% and 100 % of the weight of fine aggregate, using a total of 27 samples, with immersion treatment for 28 days. The specimen has a cylindrical dimension of 15 cm x 30 cm, and a planned slump of 30 mm - 60 mm. This research refers to SNI-03-2834-2000 for concrete mix designs. The study was conducted based on a journal and specifications on concrete compressive strength. The study was conducted at the Laboratory of Civil Engineering, Riau Islamic University. With variations in the shell fractions of 0%, 10%, 20%, 30%, 40%, 50%, 60%, 70% and 100% of the weight of fine aggregate. The results of this study indicate the compressive strength of concrete with the substitution of shell shell fragments to fine aggregate from the percentage of 0% to the percentage of 40% has increased, while the percentage of 50% to the percentage of 100% has decreased. But at the percentage of 50% and 60% meet the compressive strength of the plan. Where at 0% percentage obtained compressive strength value of 21,043 MPa, at percentage of 10% obtained compressive strength value of 21,326 MPa, at a percentage of 20% obtained concrete compressive strength value of 21,420 MPa, at a percentage of 30% obtained compressive strength value of 21,609 MPa, at a percentage of 40% obtained a compressive strength value of 21,892 MPa, at a percentage of 50% obtained a compressive strength value of 21,043 MPa, at a percentage of 60% a concrete compressive strength value of 20,854 MPa, at a percentage of 70% obtained a compressive strength value of 19,439 MPa, and at a percentage 100% obtained compressive strength value of 16,230 MPa. The use of shell shell fractions with a percentage of 0% to 60% is effectively used as a substitute for some fine aggregates, but at a percentage of 70% to 100% is not effective in use as a substitute for fine aggregate