The way winter concreting

 

(57) Abstract:

The invention relates to the construction of production and can be used in the manufacture of concrete products in the field at low temperatures. The purpose of the invention - is to increase the speed of curing at low temperatures and reduced consumption of salt additives. The way winter concreting includes preparation of antifreeze additives - two salt solution, the concrete mix with the introduction of additives, processing the mixture of a single electric discharge specific energy drops below 0.06 kJ/DM3the concrete placement in the formwork. Antifreeze additive is introduced into the concrete mixture with a reduced to 10-12% of the consumption from the estimated quantities. 1 C. p. F.-ly, 1 Il., table 2.

The invention relates to the construction of production and can be used in the manufacture of concrete products in the field at low temperatures.

The known method of winter concreting the heating up of the concrete mix, which consists in passing through concrete mix electric current [1]

However, this method has a high consumption of electrical energy and a long is, kiuchumi preparation of antifreeze additive two-component salt solution, the concrete mix with the introduction of additives, concrete placement in the formwork [2]

The disadvantages of this method include increased corrosion of the reinforcement, lower resistance, lower intensity strength and high consumption of salt.

The purpose of the invention is to increase the speed of curing at low temperatures and reduced consumption of salt additives.

The aim is achieved in that in the method of winter concreting, including the preparation of antifreeze additive two-component salt solution, the concrete mix with the introduction of additives, concrete placement in the formwork prior to placement in the formwork of the concrete mixture with the additive process a single electric discharge specific energy drops below 0.06 kJ/DM3. This antifreeze additive is introduced into the concrete mixture with a reduction of 10 to 12% of the consumption from the estimated amounts.

The way winter concreting is as follows.

According to the meteorological situation for the next ten days to accept the estimated external air temperature and Nadirova salt solution and water served in the drum of the concrete mixer and prepare the concrete mix. The concrete mixture is treated with a single electric discharge specific energy not lower than W0,06 kJ/DM3that puts in the casing, where the concrete is gaining ultimate strength.

In the drawing 1 shows the results of the research. The results showed that the increase in the strength of the activated concrete with exposure at positive temperature, followed by freezing and frozen (curve AB) is 1.6 times higher than the strength of the control samples (curve CA). The greatest change in the speed of curing is visible within the first 7 days. The hardening of concrete is activated single electric discharge indicates a higher strength than the strength of the control samples. The data table. 1 shows that the strength of the treated samples after 3 days. 2.4 times, and at 7-day age 1.5 times higher than the untreated, but with the same weight content of salt additives.

From table. 1 shows that the consumption of salt can be reduced by 35 to 40% without changing the strength characteristics.

During the experiments, the salt solution was added to the concrete mixture and after its processing by the electrical discharge. However, in this case, the strength of concrete samples was on the processing of the electrical discharge.

Reduce consumption of salt additives, apparently, due to the high strength of concrete at an early age, which is determined by the strength of the gel skeleton formed by increasing the crystallization centers and involvement of a larger number of cement hydration reaction. At the same time, this strength is sufficient to prevent destructive processes at low temperatures from the expansion of chemically unbound water in the pores, destroying the concrete structure.

Thus, the proposed method improves the speed of curing of concrete at low temperatures and reduces the consumption of salt additives that can be used in the manufacture of reinforced concrete structures in the field.

1. The way winter concreting, including the preparation of antifreeze additive two-component salt solution, the concrete mix with the introduction of additives to the concrete mixture in the mold, characterized in that prior to placement in the formwork of the concrete mixture with the additive process a single electric discharge specific energy drops below 0.06 kJ/DM3.

2. The method according to p. 1, wherein the antifreeze additive in the

 

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