The article presents the coefficients of the constructive quality of fine-grained
concrete and structural foam concrete with different percentages of micro-silica in the mixture.
The selection of the composition of a highly mobile concrete mixture for manufacturing small architectural forms has been performed, and the strength characteristics of light fine-grained fibrous concrete have been studied. It has been experimentally established that the optimal ratio of the Portland cement to microsilica is 1: 1. The introduction of basalt fiber in the amount of 0.5% of the mass of solids contributes to the increase in bending strength of fine-grained concrete to 70%.
The article presents the results of a study of water absorption of non-autoclaved foam concrete based on microsilica. The dependence of water absorption by mass and by volume on the average density of foam concrete in the range of 500÷700 kg/m3 is derived. It is experimentally established that the water absorption of foam concrete based on microsilica the grade D500 by mass is 100, 9 %, by volume – 53.6 %, for the grade D700 – 64.3 % and 42.4 %, respectively. At the same time, a day after immersion in water, foam concrete the grade D500 gains an average of 69.7% from full water absorption both by mass and by volume, foam concrete the grade D700 – 66.1 %. Full of water absorption of non-autoclaved foam concrete based on microsilica reaches in seven weeks later. The difference in water absorption between the grades D500 and D700 by mass is 56.9 %, by volume – 26.4 %. The closed porosity of foam concrete based on microsilica the grade D500 is 26 %, and for the grade D700 – 32.2 %.
The article presents the results of determining the scale coefficients for autoclave structurally heat-insulating aerated concrete based on fly ash. In the course of research, the dependences of the compression strength values on the size and area of the working section of samples of autoclave aerated concrete of the grades D500 and D600 are derived. The dependences of mechanical characteristics on its average density in the range from 500 to 600 kg/m3 are established. For samples of autoclave structurally heat-insulating aerated concrete based on fly ash, the values of scale coefficients were experimentally determined, which in relation to the base sample of 150x150x150 mm are: for prisms of 40x40x160 mm – 1.45, for cubes of 70,7x70,7x70,7 mm and 100x100x100 mm – 1.2 and 0.95, respectively.
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