SU1680675A1 - Raw mix for preparing light-aggregate concrete - Google Patents

Abstract

Raw mix for lightweight concrete relates to the building materials industry, in particular to the production of raw mixes in the production of lightweight concrete, used mainly for the manufacture of enclosing structures with constructive thermal insulation properties. The purpose of the invention is to increase the mobility of the raw mix and increase the strength of concrete while reducing its density. Raw mix for the preparation of lightweight concrete contains, wt%: Portland cement 16.658- 20.954; sand 10.477-15,826; expanded clay gravel 43,520-46,643; waste asbestos-cement enterprises. About-O.Obb; water the rest. The strength of concrete compression 121-129 MPa, density 1110-1130 kgUm3 mobility 12-15 cm. Table 2.

Description

The invention relates to the building materials industry, in particular to the production of raw mixes in the production of lightweight concrete, used mainly for the manufacture of building envelopes with structural and thermal insulation qualities.

The purpose of the invention is to increase the mobility of the raw mix and increase strength while reducing the density of concrete.

Condensation products of the production of resorcinol with furfural are compounds with an average molecular weight of 600, contain oligomeric products of condensation of the resorcinol with furfural 80 wt.%, Consisting mainly of the following molecules

C-1-w

where η = 2-4;

R = —H, —OH, an alkyl or hydroxyalkyl radical, as well as resin resin production products of resorcinol “20 wt.%, Present. a mixture of disubstituted phenols and aromatic sulfonic compounds.

The test of raw mixes for mobility was carried out in accordance with a known method. Light concrete was prepared from the raw material mixture with and the compressive strength was determined on cubes with an edge of 100x100x100.

The test results of raw mixtures of vi concrete are presented in table. 2.

The test results presented in table. 2 show that the use of raw mixes of the proposed composition leads to a significant increase in the mobility of the raw mix and to

1680675 A1 and the concrete strength and are: mobility of the mixture (cone sediment) 12-15 cm, concrete strength under compression 121-129 kg / cm ² .

At the same time, the bulk density of concrete does not increase and even decreases, since the use of the proposed plasticizing additive makes it possible to increase the proportion of light fine aggregate from asbestos cement plants and reduce the proportion of quartz sand.

The use of raw mixes below and above the proposed limits does not lead to a positive effect, since there is no increase in concrete strength 15 and an increase in the mobility of the raw mix.

The use of the proposed raw material mixture for the preparation of light concrete allows to increase the mobility of concrete 20 mixture from 4 cm (sediment cone according to the known) to 12-15 cm and increase the strength of light concrete obtained from the proposed concrete mixture by 20-28%.

Claims (1)

The raw mix for the preparation of lightweight concrete, including Portland cement, sand, expanded clay gravel, asbestos cement waste, a plasticizing additive and water, is distinguished by the fact that, in order to increase the mobility of the raw mix and increase strength while reducing concrete density, it contains as a plasticizing additive, condensation products of the production of resorcinol with furfural in the following ratio of components) wt.%: Portland cement Sand Expanded clay gravel Wastes from asbestos-cement enterprises Condensation products of production wastes of resorcinol furfural Water 16.658-20.954 10.477-15.826 43: 520-46.643 4,165-5,642 0.050-0.065. Rest Table 1 Mixture components Composition, May * . £, for example 2 > eleven eleven eleven <1 n 1 -------------- 1 I * i Y ⁵ · - Portland cement 14,401 16,658 18,842 20,954 22,999 Quartz sand 18,636 15,826 13,107 10,477 7,931 Asbestos cement waste 3,388 4,165 4,915 5,642 6,345 Expanded clay gravel 48,285 46,643 45,056 43,520 42,033 Furfural Resorcinol Waste Condensation Products 0,042 0,050 0,057 0,065 0,072 Water 1 15,248 16,658 18,023 19,342 20,620