SU1715917A1 - Method for building pavement sub-base in winter time - Google Patents

Abstract

The invention relates to the construction of road foundations in winter at low temperatures and can be used in building aerodromes, construction, floors and platforms, the construction of monolithic foundations, etc. The purpose of the invention is to expand the construction season. Drainage and leveling layers are laid and compacted at a temperature of up to -50 ° C, while they are poured over with a solution of sodium or potassium hydrate, then a base layer of slag-alkaline concrete is applied, which is treated with a solution of sodium oxide hydrates during alternating temperatures. or potassium with a density of 1.16-1.20 g / cm in the amount of 2-2.5 l / m2.

Description

The invention relates to the construction of road foundations in winter at low temperatures and can be used in the construction of airfields, the construction of floors and platforms, the construction of monolithic foundations and other structures.

The purpose of the invention is the extension of the construction season.

The road base according to the inventive method is performed in the following sequence: on the ground cover cleared of snow cover, the ground is laid and sealed alternately draining and leveling the base layers with watering the layers with a solution of alkali sodium and potassium hydrates. Then, the base layer of slag-alkaline concrete with a temperature of 0-15 ° C is packed and compacted with a set of machines or distributed by a bulldozer, a motor grader with rollers.

The speed of movement of the concrete distribution and finishing machines is set depending on the ambient temperature. The distribution of slag-alkaline concrete during distribution should correspond to the draft of a standard cone 1-2 cm (hardness index 5-15 s). During the period of established alternating air temperature, the slag-alkaline base laid in winter conditions is cleared of snow by a rotary auger or other types of machines on a pneumowheel, and a solution of alkali sodium or potassium hydrates with a density of 1.16-1.20 g is applied to its surface. / cm in the amount of 2 - 2.5 l / m.

At low air temperatures (up to -50 ° C), the process of hardening slag-alkaline concrete does not stop, but only slows down. This is explained by the fact that with the beginning of ice formation in the liquid phase of the slag-and-dough, the concentration of

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hydrates of sodium or potassium oxide, thereby reducing the solubility of calcium oxide and lowering the basicity of hydrosilicates. Consequently, at low air temperatures, dibasic calcium hydrosilicates are formed in the cementitious slag-alkaline dough. After adding the alkali solution on the surface and inside the concrete mass, ice layers dissolve, the liquid phase increases with the optimization of the concentration of the alkaline component, and the dibasic calcium hydrosilicates transform into low-basic calcium hydrosilicates or mixed hydrosilicates, for example sodium calcium silicate, Thomonite crystallization cementing slag alkaline stone.

This method eliminates the need for energy resources and thermal insulation materials, replaces cement, shortens the winter season and time.

Claims (1)

construction, increase the utilization rate of machines and mechanisms. Economic efficiency, due to the maintenance of year-round road construction of 20-25 thousand rubles. on one km of the road. Claims The method for constructing a road base in winter conditions includes laying and sealing a drainage, leveling layer and a base layer of a concrete mix, characterized in that, in order to extend the construction season, the drainage and leveling layers are laid at a temperature of -50 ° C, the latter are treated with a solution of sodium or potassium oxide hydrates, and a slag-and-alkali concrete mixture is used as a concrete mixture, which is treated with a solution of guide Sodium or potassium oxide rats with a density of 1.16-1.20 g / cm3 in the amount of 2-2.5 l / m2.