SU941331A1 - Concrete mix for producing pipes - Google Patents

Description

The invention relates to concrete mixes for forming concrete and reinforced concrete pipes. Concrete mixtures are known for forming concrete and reinforced concrete pipes containing, aggregates and water to. The disadvantages of such mixtures are increased cement consumption and relatively low mobility, which requires significant energy and labor costs in the molding structures. Plasticizing agents are used to obtain more mobile concrete mixes at normal cement consumption. The closest in technical essence and the achieved result to the proposed is a concrete mixture comprising a mineral sticking agent, a filler, a condensation product of L-naphthalene sulfonic acid and formaldehyde, sodium sulfate and water. However, a concrete mixture of the indicated composition also as mixtures containing other plasticizing agents, has sufficient workability, does not solve the problem of obtaining dense waterproof concrete with reduced costs of cement. The purpose of the invention is to increase the water resistance and strength of concrete produced from cast concrete mixes. The goal is achieved by the fact that a concrete mixture comprising a mineral sticking agent, aggregate, condensation product (b - naphthalene sulfonic acid and formaldehyde, sodium sulfate and water, additionally contains aluminum powder in the following ratio of components, wt.%: Mineral in the sticking 1525 Aggregate 62-78

The condensation product is naphthalenesulfonic acid and formaldehyde 0,, 13 Sodium sulfate 0, T-0.4 Aluminum powder 0.001-0.005 WaterExtra

The additive is introduced into the concrete mix together with the scooping water in the amount of 0.5-2.0 by weight of cement. With the introduction of the additive in the concrete mix, the mixture is diluted: the mobility (sediment of the cone) from 2 cm can be increased to 2 ohms. The cast mixture can be laid in the form of a pipe in 5-15 minutes, instead of 60-90 minutes, which are required to lay the usual mixtures with OK 2 cm. The dilution of the concrete mixture is due to the presence of a surfactant - a condensation product in the additive composition. naphthalenesulfonic acid and formaldehyde. At the time of forming the pipe, the effect of the electrolyte and the gas forming agent on the air, the properties of the mixture are practically unaffected.

During the heat-humidity treatment at an overpressure (2.0 3,), during the interaction of cement hydration products with electrolyte, complex salts are formed, which accelerate the further hydration of cement, and the formation of cement stone. Aluminum powder plays the role of an agent that additionally compresses the laid concrete mix. When it interacts with water, hydrogen bubbles are released, sealing the capillary pores present in the fresh concrete mixture.

There may be ways to filter water in concrete. In addition, gas bubbles improve the structure of concrete due to the formation of uniformly distributed in the cement stone

fine pores and thinner capillaries,

The table shows the results of testing concrete mixes of different composition and concrete with an additive.

22: 70: 0: 0: 0: 8

22: 70: 0.1: 0: 0: 02: 0.00: 7.88 22: 70: 0.05: 0.1: 0.001: 7, 22: 71: 0.05: 0.1: 0.001 : 6, 22: 70: 0.09: 0.25: 0.003: 7.657

22: 72: 0.09: 0.25: 0.00: 0.003:: 5, B57

22V70: 0.13: 0,: 0.005: 7, 22: 73: 0.13: 0.4: 0.005:, 5 15: 78: 0: R: 0: 7 15: 78: 0.1: 0, 02: 0.00: 6.88 15: 78: 0.09: 0.25: 0.003: 6.657

Claims (1)

Claim Concrete mixture for the production of pipes, including mineral binder, aggregate, condensation product (L-naphthalene sulfonic acid and formaldehyde, sodium sulfate and water, characterized in that, in order to increase water resistance and strength, it additionally contains aluminum powder in the following ratio of components, wt.% Mineral binder Aggregate Condensation product (unaphthalenesulfonic acid and formaldehyde Sodium sulfate Aluminum powder Water 15-25 62-78 0.05-0.13 o, 1-o; 4 0.001-0.005 Else