PENGARUH CANGKANG KERANG DARA SEBAGAI BAHAN TAMBAH AGREGAT HALUS TERHADAP KUAT TEKAN DAN MODULUS ELASTISITAS BETON

Abstrak

The increasingly advanced era of globalization has led to increasingly rapid developments in construction technology. Developments in construction technology are needed so that the required materials are available easily and quickly. The more concrete technology develops, the more innovation there will be to improve the quality of concrete. One form of innovation is by including some additional materials into the mixture that makes up the concrete. Concrete is a mixture of Portland cement or other hydraulic cement, fine aggregate, coarse aggregate and water as well as concrete additives. This research uses pigeon shells as an added material for fine aggregate by reviewing the compressive strength and modulus of elasticity of concrete. Tests were carried out at the age of 28 days, cylindrical test specimens with a diameter of 160 mm x 300 mm with variations of 0% virgin shell (normal concrete) and 2%, 4% and 7% with 5% superplasticizer added (mixed concrete). Based on the research results, it was found that the average compressive strength value at 28 days of normal concrete mix was 16.91 MPa, the addition of 2% shellfish shells was 13.26 MPa, the addition of 4% shellfish shells was 15.97 MPa, while the value The average modulus of elasticity in the normal concrete mix is ​​7850.13 Mpa with a decrease of 60.86%, the concrete mix with the addition of 2% virgin shells is 1105.91 Mpa with a decrease of 94.04%, the concrete mix with the addition of shells 4% dara was 1097648 Mpa with a decrease of 44.25%, concrete mix with the addition of 7% dara shells was 4657.30 Mpa with a decrease of 76.50%. So it can be concluded that the use of virgin shell waste as a fine aggregate additive reduces the compressive strength and modulus of elasticity of concrete.