Influence of Electro-Surface Properties of Mineral Filler on Frost Resistance of Powder Concretes
The influence of mineral fillers with positively and negatively charged electro - surface properties on the frost resistance of powder concretes is investigated. Tests for frost resistancewere carried out according to GOST 10060-2012 (5.1), the first basic method. It is established that the samples of powder concrete with 30% of ground quartz sand have the lowestfrost resistance, compared with powder concrete with 30% of ground marble and fine - grained concrete C:N=1:3. The results confirmed the hypothesis stated in the paper that concretes,in which the charge of the surface of pores and capillaries is strongly shifted to the negative domain, are subjected to deeper saturation of the material with water. This is evidenced bythe results of changes in the mass of samples during frost resistance tests. t is proposed to use the data obtained as a theoretical basis for the selection of rational compositions of concreteof increased frost resistance, both fine - grained and powder.