ANALISIS PENGARUH PENAMBAHAN KALSIUM KARBONAT (CACO3) DAN CANGKANG KERANG TERHADA KUAT TEKAN PADA LOW CEMENT CONCRETE (LCC)

Abstract

Indonesia is a country committed to equitable development in all regions, including underdeveloped areas. The influence of sustainable development has encouraged the use of cement and its use is increasing every year. This can be damaging to the environment, as for every million tons of cement produced, one million tons of CO? gas is generated and released into the atmosphere. considering that 8-10% of total CO? emissions worldwide come from cement production. This study solves this problem by using an environmentally friendly and economical low-cement concrete using calcium carbonate and innovative mussel powder. Calcium carbonate (CaCO?) is a raw material for Portland cement and does not go through the combustion process, so it can be used as an environmentally friendly concrete alternative. Clam shells contain a lot of calcium (CaO) and are alkaline. In addition, it also contains silica and aluminum oxide, so it has the potential to be a substitute for cement materials. At this stage, the mixed design stage is carried out based on SNI 7656-2012. The tests carried out showed optimal results in each innovation, namely the provision of 15% calcium carbonate and 20% shells, resulting in an average compressive strength of 28-day-old concrete of 27 MPa, 34 MPa, 37 MPa, and 38 MPa. It can be concluded that LCC calcium carbonate and shells have the highest compressive strength, 7.4% higher and able to compete with normal concrete