SU1479437A1 - Method of producing lightweight material - Google Patents

Abstract

The invention relates to the production of building materials, in particular to materials based on organic aggregate - arbolita, and can be used in the production of building structures for residential and industrial buildings. In order to increase the compressive strength in the early stages of hardening, wood filler is treated with gel containing liquid glass, calcium chloride and copper sulfate in a ratio (1: 0.25: 0.5) - (1: 0.5: 1.0), then it is treated with high calcium ash and then mixed with cement. Arbolit has a density of 750-800 kg / m ³

heat transfer coefficient 0.25 W / mx K

water absorption in 24 hours 11%

flexural strength (MPa) after 3 days 0.8-1.0 and after 28 days 1.3-1.5

compressive strength (MPa) after 1 day 1.28-1.31, after 28 days 2.61-2.90. 1 tab.

Description

i

The invention relates to the production of building materials, in particular, to materials based on organic aggregate - arbolita and can be used in the production of building structures for residential and industrial buildings.

The purpose of the invention is to increase the compressive strength in the early stages of hardening.

Ash of brown coal has the following chemical composition, wt0%: SiO 30 - 40; A1eOe 9-11; Fp2039-14; CaO 28-31; MgO 5-8; S03 2-4; CaOc &3,5-6,4; pn, p, 0.9-2.3., Quality factor - not less than 1.2, Setting time: start no later than 30 minutes, end no later than 60 minutes. The bulk density is 1200 kg / m3, the modulus of basicity is 0.88. The granulometric composition of the ash is given in Table 1;

The manufacture of wood concrete is carried out as follows.

Wood shredder with a temperature of 25 ° C is fed to the mixer, then a gel consisting of liquid glass, an aqueous solution of copper sulfate and calcium chloride in a ratio of 1: 0.25: 0.5-1: 0.5: 1.0, and stirred ъ for 2-3 minutes In this case, an active colloidal film is formed on the surface of the wood particles, and

4 1

SO Ј CO 1

the presence of copper sulfate contributes to the intensive oxidation of water-soluble wood substances (their neutralization) “Then high-calcium ash is fed into the mixer and mixing is continued for 6–8 minutes.

As a result of fast-flowing hydration processes and the penetration of hydration products into the pores and capillaries of wood, a stable structural shell is formed on the surface of the wood particles. This is due to the chemisorption capacity of ash and wood, and the presence in the ash of a significant amount of silicon oxide contributes to an increase in the polycondensation phase and the formation of polymeric silicon-oxygen compounds. In addition, the absence of ash in the composition (or presence in insignificant amounts) of C9H and., Which are subject to the greatest negative effect of extractive substances, since they have the highest selective ability to adsorb hydrophilic substances, accelerates the hardening of arbolit

After the ashes are injected, the cement, the remaining part of the water is injected and the mixture is stirred until the desired mobility is obtained for 2-3 minutes. Products are molded from the resulting mixture, which are then cured by aging in natural conditions or in heat treatment chambers at t 40 -

In the early stages of hardening, the strength of arbolite is achieved due to the oxidation of water-soluble wood substances with copper ions included in the gel, which enhances the oxidation effect. bonds, and further - the rapid increase in the strength of the main mineral binder - cement, on the hardening of which the retarding effect wood extractives are excluded;

II p and me 1. Wood mixers are fed at the forced mixing mixer at 25 g., Then a gel consisting of sodium liquid glass module 3, copper sulfate and calcium chloride in a ratio of 1: 0.5: 0.25, and 70% water and stirred for 2 -3 min. R the resulting mixture is introduced into fly ash and stirred for 6-8 minutes until the wood particles are uniformly coated. Next, cement is added to the mixture.

and the remaining 30% of the water was mixed and stirred for another 2-3 minutes. Samples of size I0 x 10 x 10 cm are formed from the mixture obtained and cured in a chamber at 40 ° C for 24 hours.

5Example2. The mixer is fed wood chips at 25 ° C, the above gel with a ratio of 1.0: 1.0: 0.5 at a temperature of 25 ° C and 70% water.

o mixture for 3 min. Ash is introduced into the mixture and mixed for 6-8 minutes. Samples of 10x10x10 cm are formed from the mixture obtained. Test results and properties of wood concrete

5 are presented in table 2.

Studies of the effect of gel on arbolite were carried out on the following composition, kg: cement MESOO 250; fly ash Q 250; crushed 236; liquid glass 7.5; calcium chloride 1.9 - 3.6; copper sulfate 3.75 - 7.5; water 270,

Physicomechanical indicators of wood concrete:

Density, kg / m750-800

Coefficient

thermal conductivity

with humidity

16% W / m Q0.25

Q Water absorption

in 24 hours,% 11

Tensile strength

with bending, MPa: after 3 dt0,8-1,0

through 28 sut1,3-1,5

five

Claims (1)

Invention Formula A method for the manufacture of arbolite, which includes treating wood filler with gel containing liquid glass and calcium chloride, mixing with cement and hardening, characterized in that, in order to increase compressive strength in the early stages of hardening, wood filler is treated with gel containing liquid glass ratio calcium chloride and copper sulfide tl 1: 0.25: 0.5 - I: 0.5: 1.0, and the perrd mixed with cement, it is treated with high-grade ash. Table 1 table 2