SU1308594A1 - Method of preparing concrete mix - Google Patents

Abstract

The invention relates to the building materials industry and can be used in the preparation of concrete mixtures. The purpose of the inventive: shade is to increase the strength of concrete when using substandard aggregates. Dp of concrete preparation, aggregates are pretreated with 0.2-0.6% solution of polyoxyethylene apkinols, then mixed with another, then an aqueous solution of ferric chloride or ferrous sulfate is added, taken in an amount of 3-10% by weight of the solution alkoxy polyoxyethene esters. 1 tab. from 00 ate

Description

1130

The invention relates to methods for preparing concrete mixtures and may find application in construction.

The aim of the invention is to increase the strength of concrete when using substandard aggregates.

The method is carried out as follows.

Ton mix using cement, coarse aggregate - granite crushed stone of fraction 10-20 mm with 5% chitney-clay impurities, fine aggregate - quartz sand with a particle size module of 1, 6, containing 6.3% of silty-clay impurities, or industrial waste foundry - spent molding sand (OFS).

The composition of the concrete mix, kg / m: now ben 1250; sand or OFS 620; cement 370; V / C 0.44.

The aggregates are treated with a solution of a surfactant of the SP grade — a solution of polyoxy ethylene ethers of alkynols. For this, the aggregates are mixed with an Oil solution of a concentration of 0.2-0.6%, in the amount necessary for wetting

..

Emergency; 1 30 fP j f-JjfJiL t l. A, i AtJ. -IXiJJ t iij / of the entire surface (i.e. in this case, 4% of the mass of rubble and 10% of the mass of the used molding sand). Za0

five

15

the aggregates are mixed with cement until it is completely evenly distributed. After that, the mixing water is poured with a stabilizing electrolyte dissolved in it, indifferent to the OP crystal chloride hydrate or iron hydrate (eCl j 6H O or Fe S04 71120), taken in an amount of 3-10% of the mass of surfactant OP.

Concrete of similar composition is prepared. According to this method, crushed stone is treated with half of the total amount of a 27.5% aqueous solution of naphthalenesulfonic acid with formaldehyde at pH 7.5 in an amount of 2.8% by weight of cement. Then scaben dried at. After that his ne

20

25

mixed with cement and pasch or OFS, and the remaining half of the aqueous solution of naphthalenesulfonic acid with formaldehyde is added together with water before mixing.

Concrete samples are molded from concrete mixtures prepared according to these two methods and tested on the first day after hardening in heat and humidity conditions according to the 3 + 3 + + 6 + 4 h mode at 80 ° C and after 28 days of normal hardening.

The test results are presented in the table.

ON

f,

LO

t CO

X o

and ё

l sh you w ash l

Sc

"

but

(U

R |

with

f.

i

LO

m

Vs

f

SL

r

rO

-

CO

CO rO

OO

U1

Gch |

about

00

1L

1L

l (1)

sh

i

513085946

As can be seen from the presented vlei, pre-processed

the data table, the strength of the concrete, the solution of the surface-active prepared by the proposed company, and with the gate water,

So, by 26-31% more when compressed, and different than that

by 19-26% at a bend in comparison with 5 the purpose of increase in durability of concrete

concrete of a similar composition, content-using sub-standard clamping the same components, in particular fillers, the latter are treated

fillers with a high content of py-O 2-0, 6% solution of polyoxyethylene-clay impurities or othene esters of alkynols, and

tant casting sand mixture, but chloride is added to the water

prepared by a known method, or ferrous sulfate in the amount of the invention, 3-10% by weight of the solution

The method of preparation of the concrete surface - active substance mixture, which includes mixing the fill-in.

Claims (1)

Claim A method of preparing a concrete mixture, including mixing, fill J4 6 lei, pre-treated with a solution of a surfactant, with a binder and mixing water, characterized in that, in order to increase the strength of concrete using substandard aggregates, the latter are treated with a 0.2-0.6% solution of polyoxyethylene ethers of alkynols, and iron chloride or sulfate is introduced into the mixing water in an amount of 3-10% of the mass of the surfactant solution.