SU1689363A1 - Raw mixture for producing cellular heat insulation material - Google Patents

Description

The invention relates to building materials, namely to the composition of raw mixtures of cellular insulating materials for autoclaved curing.

The purpose of the invention is to reduce the bulk density and increase the specific thermal resistance of the cellular heat insulating material.

The goal is achieved by the fact that the raw material mixture for the manufacture of cellular insulating material includes lime-sand in a tinder, filler, aluminum powder and additionally contains a plasticizer based on modified lignosulfonates, and

filler - clay in the following ratio of components, wt.% Lime-sand in the ground46-58

Clay41,65-53,76

Aluminum powder 0.20-0.30 Plasticizer 0.04-0.05

and with a water-solid ratio B / T (mass-to-solid ratio) in the molding mixture 1.05-1.15.

A moderately plastic clay is used as a filler in accordance with the clay classification according to GOST 9169-75. The plasticity number Mp of moderately plastic clay is in the range of 7-15, and the content of particles with grains less than 10 microns

about

00

Yu

Ca

(

WITH

typically is 30-60% by weight. Replacing ground quartz sand with finely dispersed clay, which has an increased reactivity, favors the formation of cementing phases in a hardening mixture and the creation of a more perfect material structure. In addition, the use of readily dispersible clay eliminates the energy-intensive operation of grinding quartz sand. The introduction of a plasticizer into the raw material mixture reduces the water requirement of the molding mixture with clay filler, as well as reduces the time required for the swollen raw material to mature before autoclaving.

MLF lignosulfonate plasticizer (modified lignosulfonates) is an industrial plasticizer used to plasticize concrete mixes.

The method of obtaining the raw mix envisages the use of a 10 / () solution (as such, it is supplied by the manufacturer) of the plasticizer MLF. Since the composition of the raw mix shows the amount of dry components, the content of the plasticizer is given in terms of dry weight.

Plasticizer MLF is obtained from the liquid concentrate sulfite-yeast brew (SDB) brand CBJ. A concentrate with a dry matter content of 50% is pre-diluted with water and an adsorbent is added to the solution - Portland cement of mark 400. The ratio of the mass of the concentrate, calculated on the dry matter and cement, should be 1: 1. After 2 hours of stirring, the adsorbent is separated from the suspension. The resulting liquid product is an MLF plasticizer solution. The main indicators of this solution, wt.%: The dry matter content 10; ash content in dry matter 25-35.

Example 11,93 kg moderately plastic clay having the following chemical composition, wt.%: Si02 68.03; ABOZ and Tyu2 15,17; Rb20z 6.78; CaO 0.78: MDO 1.60; K2C 2.71 loss on ignition 4.39. plasticity number 10 and the content of particles with grains less than 10 µm in size 45%, are shaken in a concrete mixer with 27.5 dm of water, to which 0.1 dm 10% aqueous solution of MPF plasticizer based on modified lignosulfonates is added in advance. Then, 13.00 kg of lime-sand into the binder is added to the concrete mixer (activity is 50% CaO. The specific surface of the device is PSC-4 475 m / kg) and mixed for 3 pins. After that

a gasifier is introduced into the raw mix - 0.0625 kg of PAK-3 aluminum powder, re-mixed for 30 seconds and the sludge is poured into a mold with dimensions of 0.4 x 0.4 x 0.5

After swelling the mixture, the raw material is kept for 8 hours to mature, then the cap is removed and the form with the raw material is loaded into the autoclave. Heat and moisture treatment of the mixture is carried out at 175 ° C (8 these) according to

0 mode 2-8-2 hours

The average values of the obtained cellular heat insulating material: the compressive strength of 0.91 MPa, the bulk of the mass of 315,

5 specific thermal resistance of 16.2 mK / W.

The composition of the raw mix is given in Table 1. The quality indicators of cellular thermal insulation material are given in Table 2.

0As can be seen from t bl 1 and 2. 0.04-0.05%

the addition of a plasticizer contributes to a decrease in the water-solid ratio V / T, as well as to an increase in the specific thermal resistance of the heat insulating material; therefore, it is advisable to use plasticized raw materials (composition 3). Thermal insulation material made from a raw mix, in which the content of lime-sand in a thicker less than 45 wt.%, Is characterized by insufficient strength - 0.79 MPa. The use of mixtures containing more than 58 wt.% Of lime-sand in the shear is not economically feasible, since it leads to an overexpenditure of this expensive raw material without a noticeable improvement in the properties of the heat insulating material. The raw mix even with a smaller, in comparison with the prototype, amount of aluminum powder - 0.20 wt.% (Mixture 2 of composition 3) makes it possible to obtain a heat insulating material with a lower bulk density. The strength in a mixture of such a composition decreases from 0.89 to 0.91 MPa as compared with progoteme5. Such a small decrease in strength is within the limits of measurement error.

Construction and technical indicators of cellular thermal insulation material

0 obtained from mixtures of the composition (mixtures 2, 3 and 4, composition 3) are within the following limits:

Volume weight, kg / m3 315 326 Specific thermal resistance,

m K / W15.7-16.2

Compressive strength, MPa0.89: 0.9 °.

All of these indicators significantly exceed the requirements imposed on indicators

350

10.75 0.8

thermal insulation products made of cellular concretes of the highest quality category, namely:

Bulk weight, kg / m3,

no more

Specific thermal resistance, mK / W, not less

Compressive strength, MPa, not less

From a comparison with the known mixture of composition 1 (using ground quartz sand as a filler) it is clear that almost all the construction and technical indicators of the proposed mixture (composition 3, with clay as a filler) are better than those of the known raw mixture.

The use of the mixture for the manufacture of cellular heat insulating material allows to improve the construction technical characteristics of cellular heat insulating products, namely, to reduce the bulk weight of products to an average of 320 kg / m and increase their specific thermal resistance to 16 m K / W, as well as expand the raw material base production of heat-insulating autoclave cellular concrete for

0

five

0

five

through the use of moderately plastic clays, unsuitable for the production of building ceramics, and clay waste generated during the washing of sand and gravel.

Claims (1)

Invention Formula Raw mix for making cellular insulating material containing lime-sand sticking, filler and aluminum powder, characterized in that, in order to reduce bulk density and increase thermal conductivity of cellular thermal insulating material, the mixture additionally contains a plasticizer based on modified lignosulfone - TSE ab as a filler - clay with a c / eating ratio of components: Izzestkovo-sand in the living46-58  /.i na 41.65-53.76 Aluminum powder 0.2-0.3. The specified plasticizer0, 04-0.05 with a water-hard ratio of V / T in the molding mixture of 1.05-1.15. T. a-b l. and c l 1 ov 1 2 3 4 one 2 3 4 12 3 4 1 2 3 4 52 47.75 C, 25 The ratio of the mass of oxen and dry blend V / T 0.03 0.04 0.04 0.05 1.20 1.15 1.10 1.05 Table 2 Table3