Investigation of the use of fly ash and marble powder in self-compacting concrete production

Throughout the world, both thermal power plants and cement production processes are mixed with millions of tons of dust every year, creating an environmental problem. Also, dust emitted into the atmosphere is a major problem that causes people's respiratory diseases and health problems. In the solution of these problems, it is seen as an alternative solution to use these powders, which are also referred to as industrial by-products, in the self-compacting concrete (SCC) production either as a substitute for cement or as a mineral additive. This study aims to investigate the effects of industrial by-products on the properties of SCC. For this purpose, Portland cement (OPC), fine aggregate, coarse aggregate, sand, water, fly ash (UK), marble powder (MT) and superplasticizer (SA) were used in the preparation of SCC. In the mixtures, 12 groups were prepared using 0%, 10%, 20% and 30% MT with 0%, 5% and 10% MT instead of cement, and spreading diameter, density, porosity, water absorption rate, pressure and flexural strength of SCC, ultrasonic pulse velocity (UPV) and high temperature resistance properties were determined. The obtained results indicated that the porosity decreased with increasing of MT and UK content, also the use of MT has a negative impact on the water absorption rates, the lowest water absorption rate was achieved with 1.8% in 5% MT and 30% UK. In addition to 20% UK contribution, it was observed that high strength can be achieved with a maximum use of 10% MT. However, in a better concrete production, the use of UK is more effective than MT and the best UPV is achieved with 4.62 km / s in 20% UK use, the maximum value of tensile strength is 10% MT and 4.49 MPa with 20% UK use. It was observed. It has been determined that as the curing time increases, the tensile strength increases, increasing the MT decreases the strength relatively and may have a positive effect depending on the use of MT and UK in parallel with the increase in the temperature and mass loss rate.