Properties of Cement Stone with Glinite Additives
The expansion of the base of mineral additives in binding substances and materials on their basis can be achieved due to the use ofnatural pozzolans and activated clays. In recent decadesa high pozzolanic activity of metakaolin, the product of thermal activation of kaoline clays, was revealed. But the scarcity of deposits and reserves of kaolin clays prevents its wide-scale productionand application. In connection with this, the last years many countries develop the use of pozzolans produced by means of thermal activation of everywhere widespread poly-mineralclays with various content of kaolin or without it. Comparative studies of the influence of addition of glinite from polymineral, not-containing kaolinite clay, which is calcined at 400-800оCand milled up to the specific surface of 200-800 m2/kg, and high-quality meta-kaolin to Portland cement on the compression strength,water absorption and coefficient of cement stone softeninghave been carried out. It is revealed that the addition of 5-10% of glinite on the basis of non-kaolinite clay, calcined at a certain temperature and milled up to different specific surfaces,to Portland cement can lead to a higher improvement of physical-technical properties of cement stone than corresponding content of meta-kaolin additives.