SU687024A1 - Concrete mixture - Google Patents

Description

I

This invention relates to a concrete mix containing modifying additives.

A known concrete mix containing sodium salt of a copolymer of salicylic acid with formaldehyde and a synthetic surfactant additive 1.

Closest to the proposed concrete mix, containing a sprinkler, a filler, a plasticizing additive — sodium salt of a copolymer of salicylic acid and formaldehyde in an amount of 0.015–0.05% by weight of the binder and water t2.

However, from this mixture get concrete with low strength properties.

The purpose of the invention is to increase the compressive strength of concrete.

This is achieved by the fact that the concrete mixture containing cement, crushed stone, sand, water and sodium salt of a copolymer of salicylic acid with formaldehyde, additionally contains ammonium nitrate in the following ratio of components, wt.%:

Cement11-14

Crushed stone47-51

Sand30-31

Sodium salt of copolymer of salicylic acid with formaldehyde 0,01-0,04

Ammonia saltpeter 0.05-0.15 Water Water Rest.

The sodium salt of a copolymer of salicylic acid with formaldehyde (GRP-1) plasticizes the concrete mixture, and reduces the consumption of a binder.

Ammonium nitrate accelerates the process of structure formation and hardening of concrete, which builds up, both under natural conditions and during heat treatment.

When a complex additive is introduced into a concrete mix, a series of physicochemical processes takes place, as a result of which the rheological properties of the concrete mix are improved, a significant acceleration of the hardening process at all stages is noted.

Claims (1)

Concrete mix is ready to go as follows: Water is supplied to the mixer drum, then solutions of sodium salt of salicylic acid-formaldehyde copolymer and ammonium nitrate are introduced into it, and then the components are added and the mixture is mixed for 3 minutes. Samples — cubes with a size of 10x10x10 cm, which are thermally treated in a steaming chamber at 85 ° C with the mode: 1 + 3 + 7 + 3, are molded from the concrete mixture of the proposed and calcined composition. Example 1. Prepare a concrete mixture containing, weight, %: Cement М-40012,5 Crushed stone 49 Sand 30 Sodium salt of copolymer of salicylic acid with formaldehyde0, 04 Ammonium nitrate 0.15 Water 8.31. Products obtained from such a mixture of names are compressive strength, kgf / cm: After heat treatment260 After heat treatment for 28 days329 After natural hardening 363. Example 2 (prototype). A concrete mixture is prepared that contains, in wt%: Cement M-400 Crushed granite Sand Sodium salt of a copolymer of salicylic acid with formaldehyde Water 4 The products obtained from this mixture have a compressive strength, kgf / cm: After heat treatment201 After heat treatment for 28 days311 After natural hardening 319. Claim of the invention Concrete mixture containing cement, crushed stone, sand, water to the sodium salt of a copolymer of salicylic acid and formaldehyde, characterized in that, in the chain of increased compressive strength of concrete, it also contains mica nitrate at a ratio of components, wt.%: Cement11-14 Crushed stone47-51 Sand30-31 Sodium salt of a copolymer, salicylic acid with formaldehyde 0.01-0.04 Ammonium nitrate 0.05-0.15 WaterEverything Else. Sources of information that are taken into account when examining 1.Gladkov V.S., Polchkov B.I. Comparative researches of concrete with various complex yabavkam. Belyu and reinforced concrete, 1976, N 10, p. 13-14. 2, USSR Author's Certificate No. 404809, cl. From 04 To 25/02, 1971.