SU833745A1 - Raw mixture for producing light-weght concretes - Google Patents

Description

(54) RAW MATERIAL MIXTURE FOR PREPARING LIGHT CONCRETE

one

This invention relates to chemistry, namely to raw materials for lightweight artificial stones, and can be used in the building materials industry.

Raw mixtures are known for lightweight mineral-based artificial stone stones, for example, portland cement and expanded aggregates l.

A disadvantage of the known mixtures is alkaline corrosion of portland cement, which determines reduced corrosion and air resistance.

The closest to the one proposed is light-weight mixture 2, containing porous aggregate, low-modulus liquid glass and ground granulated blast furnace slag in the following ratio of components, weight. % :.

Porous aggregate

large30-45

small15-30

Low-modulus liquid glass 15-30

Ground granulated house slag 25-40. Expanded clay and agloporite are used as porous aggregates. Such a mixture does not provide the possibility of obtaining materials with a low bulk density with sufficient strength.

The disadvantage of the products obtained on its basis is also low air resistance and corrosion resistance. .

The purpose of the invention. - reduction of bulk density, as well as the increase in corrosion resistance and air resistance of products based on the proposed mixture.

The goal is achieved by the fact that the raw mix for the preparation of light concretes, which includes ground granulated slag slag, low-modulus liquid glass and a porous aggregate, contains as a porous aggregate. valuable perlite or vermiculite in the following ratio of components, wt.%:

Low-modulus liquid glass5-15

(in terms of dry substance) Expanded perlite or vermiculite 45-55 Ground granulated domain

slagEverything

The proposed raw material mixture is prepared as follows.

In the concrete mixer, the expanded rock and the granulated blast furnace are mixed for 2-3 minutes so that they are ground to a specific surface of 3000-3500. Then the required amount of low-modulus liquid glass is added along with the mixing water. The molding of the products is carried out by vibrating or pressing at pressures of 5-50 MPa, depending on the given strength and bulk density of the products. Molded products harden at 15-25 ° C for 12 hours and then dried at W-DL C for 2-3 hours.

The binder is synthesized during the solidification process of such mixtures and consists of low-base hydrosilicates, as well as alkaline hydroaluminosilicates, which is formed by the interaction of the expanded rock with the components of the tartar. Alkali present in the rock is involved in cation exchange reactions. As a result of these reactions, Na or IC ions displace Ca ions of the slag, h; drive: Pm to form additional structural elements like zeolites of analcime,

337454

natrolite, sodalite, etc., which are products of slag alkaline hardening.

The specified products hardening obus. Conduct the corrosion resistance and air resistance of products.

Thus, the aggregate alkali serves as a reserve for the alkaline component of the tenant and has a positive effect on the material properties.

The resulting products with a mass mass of 500-1350 kg / m have a compressive strength of MPa.

From the proposed raw material mixture 15, it is possible to manufacture extremely lightweight, heat insulating, high-strength structural-heat-insulating wall materials, such as bricks, plates, panels, etc.

20 Dp Obtaining the specified raw material mixture, the main domain granulated slag, ground to a specific surface of 3300 cm / g (in PSC-2), chemically pure sodium metasilicate 25, and perlite sand are used.

For 2 minutes, ground granulated slag is mixed with perlite sand, and then an aqueous solution of sodium metasilicate is introduced, 30 From the prepared mixture, they are pressed

cylinders with a diameter of 5 and a height of 5 cm, or make samples of 7x7 7 cubes - by vibrating.

The molded specimens harden 35 in natural conditions (t 18–20 C) for 12 h, during subsequent drying (C – C C) for 3 h.

Corrosion resistance is determined by the coefficient of durability (cs) of samples that are found in soft waters for six months.

The results of physical and mechanical tests are given in the table.

The proposed mixture provides for obtaining highly efficient structural and thermal insulating wall materials with high technical and economic indicators:

Tensile strength

in compression, MPa 4.5-40

Bulk weight, kg / m 540-1350

Frost resistance

cycle 25-250

Water absorption,% 12-20

Air resistance

50-350

cycle

The use of the proposed mixture is economically more advantageous due to the exclusion of Portland cement and its replacement with slag-and-alkali metal in the ground.

Claims (2)

Claims. Raw mix for the preparation of lightweight concrete, including granulated blast furnace slag, low modulus 337458 liquid glass and porous aggregate differing from the fact that, in order to reduce bulk density, increase air resistance and corrosion resistance, it contains expanded perlite or vermiculite as a filler in the following ratio of components, wt.%: 10 Low Modulus Liquid Glass (in terms of dry substance) 5-15 Expanded perlite or 15 vermiculite45-55 Domain granulated slag Else Sources of information taken into account in the examination of 20 1. Gorynov K.E. Technologists mineral insulating materials and lightweight concrete, M., stroiizdat, 1970, p. 192-197. 2. USSR author's certificate 25 No. 363675, cl. From 04 To 15/02, 1969.