SU808432A1 - Complex additive to concrete mix - Google Patents

Description

one

The invention relates to compositions of complex additives to concrete mixes and may find wide application in the building materials industry in the manufacture of concrete of increased strength and durability.

Known addition of silicone fluid in an amount of 0.01-0.6% by weight of cement in the concrete mix 1J

Closest to the proposed technical essence and the achieved result is a complex additive 2, including polyhydrosiloxane and calcium nitrate, in the following ratio of components, wt.%

Polyhydrosiloxane 0.05-0.1.

Calcium Nitrate 1-2

The disadvantages of the known additives low strength of the resulting concrete and slow hardening of the concrete mix.

The purpose of the invention is to increase the strength and accelerate the hardening of the concrete mix.

The goal is achieved by the fact that a complex additive in a concrete mix, including polyhydrosiloxane and an inorganic component, contains potassium fluoride as the latter.

the following ratio of components, weight.h:

Polyhydrosiloxane 0.05-0.2 Potassium fluoride 0.1-2.0

When polyhydrosiloxane is introduced into the concrete mix, for example, NGL-94 and potassium secondary, a number of new effects appear in the system.

Fluorides promote cementing of particles among themselves due to the formation of potassium fluoride. In addition, potassium fluoride catalyzes the reaction of the interaction of Si-H groups in a NGL-94 liquid with water and hydroxyl groups of cement stone, which leads to a more rapid formation of a siloxane film chemically bound to the cement stone.

The consequence of this is more

0 strong fixing of NGL-94 in cement stone and increasing the effectiveness of its effect.

Three mixtures of components are prepared, the compositions of which are listed in Table 1.

five

The prepared complex additive is introduced into the concrete mix of the ratio of cement, sand, crushed stone and mixing water, in which is 30 L:, 7: 3.1: 0.45.

The test results obtained concrete in comparison with the known are given in table 2.

The proposed complex additive significantly increases the strength of concrete while simultaneously accelerating its hardening.

: Ta b l and c al

Table 2

Compressive strength, kg / cm;

the invention

Formula

The complex additive in the concrete mix, including polyhydrosiloxane and the inorganic component, is so talcause that, in order to increase the strength and accelerate the hardening, it contains potassium fluoride as an inorganic component in the following ratio of components, parts by weight:

 Polyhydrosiloxane 0.05-0.2 Potassium fluoride 0.1-2.0

Sources of information taken into account in the examination

1. Batrakov V-.G. Improving the durability of concrete additives silicone polymers. SI. M., 1968, p. 126.128.

2. Recommendations on the use of chemical additives in concrete SI, M., 1977, p. 13.

Claims (1)

Claim A complex admixture in the concrete mixture, including polyhydrosiloxane and an inorganic component, characterized by the fact that, in order to increase strength and accelerate hardening, it contains potassium fluoride as an inorganic component in the following ratio of components, 35 parts .: Polyhydrosiloxane 0.05-0.2 Potassium Fluoride 0.1-2.0