Optimum Content of Matos as an Additive in the Application of Cement Soil Stabilization as a Cement Composite Soil Base Layer

The challenge of applying soil–cement stabilization as a soil–cement composite foundation layer (LFSKT) in Indonesia is to find quarry soil with a grain content of less than 35% passing filter no. (additive) to achieve the required strength. This paper presents a laboratory study's results on adding Matos soil stabilizer additives to cement-free soil compressive strength. A series of laboratory tests based on the Indonesian National Standard was carried out on the soil–cement and soil–cement-mats mixture composition to determine the optimal Matos content. The cement content used was 6%, 8% and 10% of the dry weight of the soil grains, while the Matos content was 1%, 1.5% and 2% of the cement weight. The study's results showed that the optimum Matos content of 1.5% occurred for all cement content in A-7-6 soil and 6% cement content in A-7-5 and A-4 soils.