SU1677033A1 - Additive for concrete mixes - Google Patents

Abstract

The invention relates to compositions for building works and may find application in the building materials industry in the production of slag stones in the preparation of mortars and concretes. The purpose of the invention is the acceleration of curing in the early periods of hardening. The additive contains, in May,%: the waste of esterification of trichlorosilane is 7.4-9.1, the red bauxite slime is 90.9-92.6. The strength of slag stone at the daily age is 29.7 kg / cm, B seven-day 54.0 kg / cm 2 tabl.

Description

The invention relates to compositions for building works and materials and may find application in the manufacture of slag stones, in mortars and concretes.

The purpose of the invention is the acceleration of curing in the early periods of hardening.

To obtain an additive, washed red mud (KS), having a chemical composition,%: ReaOs45-50; SiOa 15.4-18.0; 13.5-16.0; CaO 8.1-9.3; Na20 4.5-5.2, at pH 11.9-12.2 and T.ZH 1 2.75 (W 73.3%) is adjusted by condensation to a moisture content of W 60-65% and mixed with waste from the process of esterification of trichlorosilane (MA), having a chemical composition,%: HCl 27; Si (OCHs) 0.6; water the rest. The mixture was incubated for 3 h, after which it has a pH of 6.5-7.0.

Example. Use of an adjuvant,

Using the proposed additive, a composition for the manufacture of cinder blocks is prepared.

The composition of the compositions is given in table. 1. For comparison, the compositions were also tested and using hydrochloric acid in addition,

The test results are given in table. 1 compositions are listed in Table. 2

Tests are carried out on samples-barrels according to GOST 5802-78.

The amount of the additive in the composition of building compositions is determined by the final moisture content of the mixture (since the additive is introduced in the form of sludge), which was supposed to ensure the processability of the dosing, vibration compaction and pressing of the charge. In the permissible intervals of moisture content of the mixture, find the optimum range for the strength characteristics as follows from the table. 2, at the optimum during the day, the samples gained from 30 to 32% of 28-day strength, and as a result, their strength was higher than the strength of control samples (62, 7 against 56 kg / cm2).

(VJ XI

O w

with

Such a set of strength is 1.5 times faster than that achieved in the prototype and allows refusing the steaming operation in the technology of manufacturing cinder blocks. The result obtained is explained by the intensifying effect of ethyl silicate upon the hardening of the compositions with the additions of the products of the hydrochloric acid decomposition of red mud.

In addition, the advantages of the invention are the disposal of hydrochloric acid wastes, which, due to contamination with ethyl silicates, did not meet the requirements for commercial hydrochloric acid, therefore there is no need to neutralize the acidic wastes with reagents before discharging them into reservoirs and eliminating contamination of the latter; it is possible to more efficiently use red mud in

production technology of building materials that is not associated with the drying of these wastes.

Claims (1)

The invention's additive to building mixtures, predominantly lime-slag, includes red bauxite slurry with a moisture content of 60-65% and a hydroacid component, characterized in that, in order to accelerate the build up of strength in the early stages of hardening, it contains waste as a salt component. of trichlorosilane esterification in the following ratio of components, vol.%: Esterification waste trichlorosilane7,4-9,1 Red bauxite sludge moisture 60-65% 90.9-92.6 Table 1 table 2