An Investigation on the Use of Borax Mineral as Portland Cement Replacement Material H. Koyuncu, R. Bakış, L. T. Taşpolat, G. Yılmaz, ... obtained from the Etibor Co. Kirka Borax MineConcentrator Plant was used in place of concrete ... In this process, the borax was mixed with a class of 42,5 R OPC, aggregate, sand ...