SU1694394A1 - Method of forming hydrovibration compacted concrete pipes - Google Patents

Abstract

The invention relates to the production of vibrohydropressed pipes from concrete mixtures and provides increased crack resistance and water resistance. This is achieved by the fact that during the preparation of the concrete mixture, superplasticizer and powdered microsilica with a specific surface area of 10,000–25,000 cm2 / g, respectively, are introduced in succession in an amount of 1–2 wt.% And 5–20 wt.% Cement, and vibration is performed with a frequency of 125-160, Hz and an amplitude of 0.05-0.5 mm.

Description

The invention relates to the production of vibro-pressed pipes.

The purpose of the invention is to increase crack resistance and water resistance.

The proposed method is carried out as follows.

Concrete is prepared by mixing Portland cement, rubble, sand, superplasticizer, taken in an amount of 1-2% by weight cement, powdered microsilica with a specific surface of 10,000-25,000 cm2 / g, taken in an amount of 5-20% by weight cement, and water. The resulting mixture is placed in a mold under vibration effects, carried out by vibrations with a frequency of 125-160 Hz and an amplitude of 0.05-0.5 mm, and after the mixture is compacted, the mold is fed to the post of hydraulic pressing and heat treatment. After the concrete has been set, the stripping strength is carried out by stripping.

As a superplasticizer, a superplasticizer C-3 is used, which is an aqueous solution of a synthetic product containing

mainly sulphonated naphthaleneformaldehyde oligomer.

Powdered microsilica is an ultradispersed silica captured in the form of dust during gas cleaning of furnaces that produce ferrosilicon.

Performing the role of pozzolanic additive, it improves the properties of cement stone and concrete.

Example 1 A concrete mixture of the following composition was prepared per 1 m3 of concrete, kg: for molding a pipe with a diameter of 1000 mm and a length of 5 m; for example, Portland cement 504; crushed stone fraction 5-10 mm 1060; sand with a modulus of particle size of 2.5 590; C-3 superplasticizer 5.04, which is 1% by weight of cement, powdered microsilica with a specific surface area of 1000 cm2 / g 25.2, which is 5% by weight of cement; water 195 liters. The components were mixed in a concrete mixer for 5 minutes. The resulting mixture was vibrated at vibrations with a frequency of 125 Hz and an amplitude of 0.05 mm and sealed for 15 minutes. Then

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the form was submitted for the post of hydraulic pressing and heat treatment and subsequent stripping.

Example The same pipe was formed in the same sequence as in Example 1, with the only difference that the amount of C-3 superplasticizer was 10.08 kg, which is 2% by weight of cement, the amount of powdered microsilica with a specific surface area of 25000 cm / g was taken equal to 100.8 kg, which constituted 20% by weight of cement, vibrating at a frequency of 160 Hz and an amplitude of 0.5 mm for 20 minutes was carried out by vibration.

The manufactured pipes were tested, tests showed that the pipes are of good quality, reasonably waterproof and have no cracks.

Claims (1)

Invention Formula 0 five The method of forming vibrohydropressing pipes from concrete mixes, which includes preparing the concrete mix, laying it into a mold under vibration, subsequent hydropressing with heat treatment and stripping, characterized in that, in order to increase the fracture toughness and water resistance, when preparing the concrete mix, t successively superplasticizer and powdered microsilica with a specific surface of 10,000 to 25,000 cm2 # g, respectively, in an amount of 1-2% by weight and 5-20% by weight of cement, and vibration is effected with a frequency of 125-160, Hz and an amplitude of 0.05-0.5 mm.