SU1320193A1 - Concrete mix - Google Patents

Abstract

The invention relates to compositions of concrete mixtures, mainly for structures made under pressure, and can be applied in the precast concrete industry. The purpose of the invention is to increase the strength, watertightness and uniformity of large-sized products when they are molded using the method of vibropressing. The goal is achieved by the fact that the concrete mixture contains, wt%: cement 24-26; sand 23-25; water 8-: 10; addition of expanded clay gravel or phosphorus slag, hydrophobized by an inverse emulsion based on an acidic synthetic emulsol, 1-8; granite rubble the rest. The concrete mix has a strength of up to 62 MPa. 2 tab. (/ :about

Description

one . 13 The invention relates to compositions of concrete mixtures used primarily in the manufacture of structures manufactured under pressure, such as pressure pipes, and can be used in the manufacture of precast concrete.

The purpose of the invention is to increase the strength, water resistance and uniformity of large-sized products when they are molded by vibro-pressing,

As an additive, expanded clay gravel or

Portland cement

Sand

Water

Expanded clay gravel, hydrophobized by emulsion OE-2

Phosphoric slag, hydrophobicized by emulsion OE-2

Granite crushed stone

Expanded clay gravel

The prepared concrete mixes are placed in forms - prisms 600 mm high.

The manufacture of products is carried out by the method of vibropressing at a pressure of 3 MPa. Compaction and hardening of products was carried out with the removal of water out of the mold through filters and

32

phosphoric slag, hydrophobized inverse emulsion based on acidic synthetic emulsol (emulsion OE-2). Said hydrophobic additive is not saturated with water during the period of mixing the concrete mix and placing it in the mold, but under pressure applied to the concrete mix during its compaction and hardening, it absorbs excess moisture from the cement paste.

The compositions proposed (1-4) and known (5) concrete mixes are given in table. one.

Table 1

25 26 24 25 9 10

7.5 8 34.5 31

25 24 9

40.5 1.5

special gaps in the forms or without diversion of water outside the form.

When water is drained outside the form, the maximum moisture filtration path is 300 mm.

The results of testing samples - cubes 150x150x150 mm, cut from different parts of the prism in height, are presented in Table 2.

From tab. 2 it follows that the strength significantly increases, especially in the areas as far as possible from the filters, and there is practically no variation in the strength of concrete samples, regardless of whether the moisture is removed from the mold or not. Concrete is characterized by a height of 2

which homogeneity of concrete. It is possible to perform equipment for pressing without filters and special gaps to remove water outside the mold, which eliminates the loss of cement washed out by squeezed water, reduces the cost of molds, leads to the elimination of communications

513201936

To divert water and improve the conditions of large-sized products during formating, using their method of hydro-pressing, it contains, as an addition to the formula of the invention, expanded clay gravel or phosphoric

gshlak, hydrophobized reverse

The concrete mixture is predominantly an emulsion based on an acidic sintetistid of structures manufactured by subcutaneous emulsol, followed by

pressure, containing cement, sand, the ratio of components, wt.%: granite rubble, the addition of expanded clay-Cement-24-26

gravel or phosphoric slag and to Pesok23-25

water characterized by Water8-10

that, in order to increase the strength, the specified additive is 1-8 waterproof and homogeneous Granite crushed stone

Claims (1)

Claim Concrete mixture mainly for structures manufactured under pressure, containing cement, sand, granite crushed stone, the addition of expanded clay gravel or phosphorus slag and water, characterized in that, in order to increase the strength, water resistance and uniformity of emulsol, in the following ratio of components, wt. %: Cement 24-26 10 Sand23-25 Water8-10 Specified Additive 1-8 Granite crushed stone The rest