Synthesis of Alkali Activated Cement from Local Clay and Its Characterization

Abstract

In the present study low cost alternative for Portland cement has been developed by the chemical activation of high kaolinitic clay with NaOH solution. Different parameters affecting the synthesis of binding material and the development of high compressive strength have been studied and optimized. Different parameters of the developed material have been studied. It has been found out that the mixture cured at 80 °C for 48 h has a compressive strength of 45 MPa (6,527 psi) which is far greater than Portland cement. From the mineralogical and microstructural investigations of hardened material, it has been indicated that formation of new phases like sodium zeolite takes place which is directly proportional to the compressive strength. The newly designed material needs only 80 °C and no CO2 is evolved at all.