Pengaruh Temperatur terhadap Karakterisasi Klinker Semen dengan Substitusi 20% Batu Basalt terhadap Massa Batu Kapur dan 20% Batubara terhadap Massa Total sebagai Reduktor

Abstract

This study was conducted to determine the effect of temperature on the chemical content and crystal structure on clinker of cement with 20% substitution of basalt stone on the mass of limestone and 20% of coal against total mass. The raw material used is basalt stone from East Lampung and anthracite coal. The percentage of limestone used is 80%. All raw materials are milled, sifted, then formed pellets with a diameter of 0.8 - 1.4 cm. Pellets are dried at room temperature, then heated and burned with temperature variations of 1000 C, 1100 C and 1200 C for 1 hour. XRF results showed that basalt rock had a content of SiO2 + Al2O3 + Fe2O3 of 79.293% so that basalt could be said to have pozzolanic properties. The CaO content for cement clinker decreased, the results of XRF with combustion temperatures of 1000 C, 1100 C and 1200 C respectively were 62,329%, 55,606%, and 54,148%. Materials A, B and C respectively were burning at 1000C, 1100C, and 1200oC for 1 hour. The crystalline phase formed in material A is calcium iron oxide with the highest peak belonging to Ca at position 2? which is 26.6627 and another crystal phase, gehlenite, syn. The crystalline phase formed in material B is akermanite-gehlenite syn with the highest peak belonging to Ca at position 2? which is 31.2747 and other crystalline phases namely and wollastonite, ferroan 1A. While the crystalline phase formed in material C is akermanite-gehlenite with the highest peak belonging to Ca at position 2? which is 31.3051 and syn and other crystalline phases namely wollastonite, ferroan 1A.