4th Eurasian Conference on Civil and Environmental Engineering (ECOCEE), İstanbul, Türkiye, 17 - 18 Haziran 2019, ss.918-929
Today, cement production is increasing in the World. However, high levels of energy are used in cement manufacturing. Cement factories meet the energy requirement with petcoke and coal. Petroleum fuel based petcoke is highly toxic material. Coal prices are relatively high in Turkey. In Turkish cement sector, the process of obtaining energy from industrial waste materials has not yet developed. On the other hand, gases occurring in Rotary furnaces used in cement clinker production (SO2, CO2, NOx etc.) and micro-sized flue dust are the most important pollutants spreading to the environment in this industry. In addition to the known effects of cement factories, it is the spreading of cadmium to the environment. Therefore, the production of calcined natural and waste material based geopolymers require less energy to be produced can be advantageous for both cost and environmental protection.
This paper focuses on investigation some engineering properties of metakaolin based geopolymer mortar filling limestone powder. For this aim, 5 series of metakaolin based geopolymer mortars, where limestone powder substitution for river sand in 25%, 50% and 75% ratios, were produced. In addition, 3 series of metakaolin based geopolymer mortars without limestone powder filling were produced as references to these series. For these 8 series, weight per unit of volume, void ratio and water absorption tests, compressive and flexural strength tests in 28 day, high temperatures test (200oC, 400oC, 600oC and 800oC) were performed. Experimental results indicated limestone powder filling positively effect on some engineering properties of metakaolin based geopolymer mortars.