SU885184A1 - Concrete mix - Google Patents

Description

The invention relates to building materials, in particular, to the composition of concrete mixtures used in the manufacture of concrete products for the construction of chemical foundations. Concrete mix 1 is known, vkp cakitsa, wt. %: Porous and cement 15-20 Furyl 2-4 alcohol Sulfuric acid 0.2-0.6 aniline Calcium chloride, 2-0.6 rations 16-30 Sand Sewage water produced by polyvinyl 6-10 chloride Ostal Granite crushed stone Closest to the proposed is a concrete mixture of 2, including weight. %: Portland cement 17-22 Sand 16-26 Sewage water Production of polyvinyl chloride 8-12 Resin neutralized air entraining cedar 0.5-1.2 Bukova resin 1.5-3) 6 Shchebeny granite Else The disadvantage of limestone concrete mixtures is that the process of exploitation in the kainitic and carnallite liquors of potash production, especially hot (t 6.0-86), shrinkage of concrete is not observed for 1-1.5 years, then shrinkage develops and microcracks appear, and after two years of operation under the influence of kainitovyh and carnallite brines in potassium enriched sulphate and magnesium sulphide, shrinkage cracks in the structures become

visible to the naked eye and crystallized salts in the cracks destroy concrete and supporting reinforcement.

The purpose of the invention is to reduce shrinkage deformations over time.

The goal is achieved by the fact that the concrete mixture, including Portland cement, sand, waste: the production of polyvinyl chloride, neutralized air-absorbing cedar resin, beech resin, crushed granite, additionally contains carboxymethylcellulose and methylvinyl aerosyl at the next co-oxidation of the components, weight. %:

16-20

Portland Cement 14-23

Sand Sewage water production of polyvinyl 9-14

of chloride

Resin neutralized airflow 0, 5-1,1

cedar

1.4-3.4

Beech resin

Carboxymethylcellulose

0.5-1.2

lulose

0.002-0.004

Methylvinyl Aerosil

Granite crushed stone

Rest

The waste water produced by polyvinyl chloride contains 7-8 wt. % polyvinyl chloride latex, 1.0-1.6 wt. % aluminum sulfate and water - the rest.

Methylvinyl Arosyl is a failure product of the modification of Aerosil with methylvinyl dichlorosilane, which can be represented by the formula

CH

The specific surface area of methylvinyl erosyl is 100-120 m / g.

Low shrinkage deformations of the concrete composition are achieved by the fact that upon cement hydration, the calcium hydroxide binds to carboxymethylcellulose and methylvinyl erosyl, forming hydrosilicates, the molecular volumes of which are 2.5–3 times greater than the original minerals of the cement stone, which leads to a decrease in the shrinkage concrete deformations.

The concrete mix is prepared as follows.

Sand, Portland cement and pre-mixed carboxymethyl cellulose with methylvinyl erosil are poured into the mixer and mixed for 2 minutes.

A separately prepared additive consisting of waste water from the production of polyvinyl chloride, a neutralized air resin for curing pine and beech resin is mixed until a homogeneous mass is obtained. Then, the separately prepared additive is introduced into a mixture of sand, cement, carbosimethylcellulose and methylvinyl erosyl, crushed granite is added and mixed for 3 minutes.

In tab. 1 shows the compositions of the proposed concrete mix.

Comparative physico-mechanical properties of concrete samples prepared from the proposed concrete mix

Waste water produced by polyvinyl chloride

11.5 tov, weight. %, composed

Nu1, 1 0.8 0.5

3 2.4 1.4

-

1.2 0.9 0.6

 0.003 0.004 50.298 47.897 45.496

The compositions

2 3 Known 59.6 59.1 58.4 62.0 61.7 60.8

7.4 7.3

Durability: bending,

mPa, on

45 days hard

Water absorption,% after 28 days

45

90

180

Brand for water resistance 12

Continuation of table 1

Content of components IZT-r ..

Table 2

7.2

7.4

7.9 7.8

0.6

0.6 0.6 0.6 0.6 0.6 0.75 0.7

ten

12

Claims (2)

1. USSR author's certificate No. 590287, cl. From 04 To 13/24, 1976. 2. USSR author's certificate for 2778055 / 29-33, cl. C 04 B 13/24, 1979. (prototype).