RU1794923C - Method for preparation of mix for roadway base course - Google Patents

Abstract

Usage: road construction. SUMMARY OF THE INVENTION: a mixture for a road base device is prepared by mixing cement, an ablation zone and water heated to 55-65 ° C in a water-solid ratio of 0.9-1.1, the mixture is activated in a turbulent mixer for 3-5 minutes; then mixed with a known shell rock. The compressive strength of water-saturated samples at 90 days of age is 4.5-8.4 MPa, also with a bend of 0.8-1.35 MPa. 5 tab.

Description

The invention relates to the construction of roads and can be used in the construction of road surfaces from reinforced low-strength limestone shells.

A known method of preparing a mixture for a road base device by sequentially mixing fly ash from burning anthracite coal with cement and low-strength known shell rock.

The closest in technical essence and the achieved result is a method of preparing a mixture for a road base device, including the activation of cement in water heated to 50 ° C and subsequent mixing with aggregate.

The disadvantage of these methods is the high consumption in binder and the low strength of the base.

The aim of the invention is to reduce the flow rate and increase the strength of the base.

The goal is achieved in that in the method of preparing the mixture for the device of the road base, including the activation of cement in heated water and subsequent mixing with aggregate, fly ash is additionally introduced into the mixture of water and cement, while the water-solid ratio in the mixture is 0.9-1 , 1, the water temperature is 55-65 ° C; and activation is carried out in a turbulent mixer for 3-5 minutes, with known limestone being used as aggregate.

The following materials are used to carry out the process.

. Fly ash - dry sampling of Novocherkasskaya state district power station, is formed during the combustion of anthracite coal and deposited on electrostatic precipitators.

Physico-mechanical characteristics and chemical composition of fly ash are shown in Table 1 and 2, physico-mechanical properties of cement are given in table. 3; grain composition of lime

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ABOUT SO

n rock shell of the Taman field - in table. 4.

Portland cement brand 400 - Novorossiysk cement plant.

Known shell rock of the Taman Field, Krasnodar Territory, Temryuksky district - stone material of low mechanical strength of the brand less than 100, Wear in the drum Deval 15-30%, water absorption up to 12%. Carbonate material, reef, CaCO3 content 82-98%.

The mortar is prepared as follows.

The amount of water corresponding to the optimum humidity determined according to GOST 22733-77 is divided into two parts.

In the first part of water, equal in weight to the amount of cement and fly ash, a joint activation-hydration is carried out for 3-5 minutes at a water temperature of 55-65 ° С with stirring in a turbulent

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mixer. The remaining part of the water is introduced into the known coquina and mixed.

Thus obtained aqueous suspension of fly ash and cement, under optimal conditions for its activation, the temperature of the mixing water is 55-65 ° C (Fig. 1), the water-solid ratio is 0.9-1.1 (Fig. 2), the activation time is 3-5 minutes of hydration (Fig. 3), is introduced into a pre-moistened limestone shell, with a deeper penetration into the mortars and products of their interaction through the solution into the limestone vapor space, which ensures a more uniform combination of components in the volume of the mixture.

The compositions of the building mixture and the test results of the samples made from it are given in table. 5.

As can be seen from the above data, the described method provides a reduction in consumption in stiffening and increase the strength of the base.

Claims (1)

Formula of retraining A method of preparing a mixture for a road base device, comprising activating cement in heated water and then mixing it with aggregate, characterized in that, in order to reduce the consumption of cementitious substances and increase Portland cement brand 400-Novorossiysk cement plant strength of the base, fly ash is additionally introduced into the mixture of water and cement, while the water-solid ratio in the mixture is 0.9-1.1, the water temperature is 55-65 ° C, and activation is carried out in a turbulent mixer for 3- 5 minutes, with the shechnik known to cancer being used as filler. Table 1 table 2 Table 3 Table a Table 5