SU1618742A1 - Initial composition for making cellular concrete - Google Patents

Abstract

The invention relates to the building materials industry, in particular to the technology of autoclaved silicate materials. The purpose of the invention is to intensify the gassing and accelerate the growth of raw plastic strength. Raw mix for the manufacture of cellular concrete contains, in wt.%: As a living 20-25; ground quartz sand 40-45; aluminum powder 0.05-0.08; as an additive, it is a product of processing phosphate sludge from sludge with small liquor and caustic soda 1-3; water the rest. The swelling time of the mixture is reduced to 30–38 min, the holding time before cutting the tuber up to 105–153 min, and the compressive strength increases from 12–16%. 2 tab.

Description

The invention relates to the building materials industry, in particular to the technology of autoclaved silicate materials.

The purpose of the invention. Intensification of gaseous effluents and accelerating the growth of raw plastic strength.

The phosphate filtering sludge used as an additive in the raw mix is a by-product of phosphate production and contains in its composition, wt% Ca (NgPO) 2 14-15; NaH2P04. 18-20; R PO -2H20 9-10 (where R is Fe + Al) ;. NazSiFe tp- 12; CaS04 1-3; water is the rest. It is formed when soda is neutralized with dihydric phosphoric acid with soda, followed by sodium tripolyphosphate and fine sludge, which after flushing enters the dump

a-submill liquor is a by-product of the production of synthetic detergents and contains sodium salts of fatty and synthetic acids, sodium chloride, sodium sulfate, caustic soda, non-saponified and partially rich fatty and synthetic fatty acids of the two main fractions Cw 00

BW

and C- -C-26

Plastic. the strength of the chetobeton mixture is ensured by the presence in the composition of known accelerators — sodium hydroxide, sodium phosphates, and sodium chloride added in the final product; organic tumors obtained as a result of the interaction of synthetic fatty acids and their salts, sodium, intermediate tumors

YU

BUT

with phosphate salts contained in the sludge,

Based on the chemical composition of the phosphate filtration sludge and pit liquor, the sodium salt of synthetic fatty acids RCOONax xRCOOH (where R is hydrocarbon radicals) react with phosphate ions contained in the sludge to form calcium salts of synthetic fatty acids. and complex organic compounds. Free caustic soda can react with non-refined or partially saponified synthetic fatty acids to form their sodium salts and other intermediates.

Free synthetic fatty acids, which are in the composition of the wash liquor, intensify and intensify the kinetics of gas evolution, which ensures the homogeneity of the macro- and microstructure of the cells, and the presence in its composition of sodium chloride provides an additional increase in raw strength and final strength of cellular concrete with caustic soda, introduced into the composition of the additive, provides extraction of sodium phosphates from the sludge and creates in addition a neutral medium with the ratio of podmyl lye and filtration phosphate slag, equal to 1: 1.

The compositions of concrete mixes are given in table. one ,

An increase in the content of the additive in the mixture leads to its even greater effect, but it is not desirable that the process of gas evolution becomes unstable in time and its kinetics may destabilize. The surfactants contained in the composition of the podmyl lye 5 adsorbing cd on the surface of the particles in the tent and sand can interfere with the hydration of the cement grains.

For a certain optimum ratio of the components of the additive, formulations are prepared with a ratio of 1 submixed liquor to filtration phosphate slurry 0.75: 1, 1: 1 and 1: 0.75. The amount of caustic soda is added before it is formed in addition to pH 7-8.

Samples of silicate cellular concrete are made from Portland cement M400, lime-boiling ak

five

0

70% of ground quartz sand, PAP-1 aluminum powder

Mold samples - control, of known composition and of the proposed concrete mixture based on the specified additive in the amount of 1.2. and 3% by weight of dry ingredients.

Ground silica sand with a content of 810 g.90% and a specific surface area of S 2500 cm2 / g is used as a silica component. PAP-1 aluminum powder in the form of a 10% aqueous suspension serves as a gas forming agent.

The method of preparing the mixture is carried out according to the following sequence: water + dry sand + to the tinder (cement with lime) + additive After 2 minutes of mixing, a predetermined amount of 10% aqueous suspension of aluminum powder is fed and the mixture is stirred for another 1-2 minutes

Thermo-humid treatment of samples is carried out in an industrial autoclave, in the 3 + 8 + 4 h mode at a maximum vapor pressure of 1 MPa.

The test results of samples from the control, known and proposed formulations are given in table. 2o

As can be seen from table 2, when the ratio of phosphate filtration sludge to the podamylnoy liquor in addition 1: 1 in a concrete mix with the specified addition of 1-3% by weight of dry components, the time of expansion of the mixture is reduced from 50-54 to 30-38 min, the exposure time to cut the pinkback decreases from 170-176 to 105-153 min, the compressive strength increases by 12-16%.

Formula

goiter

five

five

Raw mix for the manufacture of cellular concrete, comprising a stinging, silica component, aluminum powder, an additive and water, characterized in that, in order to intensify the gas generation and accelerate the growth of the plastic strength of the raw material, it contains ground silica sand as the silica component, and the quality of the additive is the product of the processing of phosphate sludge filtration with the sludge and caustic soda in the following ratio of components,

five

20-25

40-45

1618742

0.05-0.08

1-3 Else

Components

Mortar: cement lime Silica component Pore-forming Additive Additive Water

45.0 42.5 40.0 40.0 39.5 39.0 45.0 42.5

0.080.065 0.05 0.080.07

-- - 13

Os-Ostal-Os-Os-Ostal-thal tal-. hoist

0.06 0.08 0.065

five

-one

OS-OC2 Rest

a little

The treatment product of filtration phosphate sludge under the smelt of caustic soda with a ratio of sludge to liquor 0.75: 1, 1: 1 and 1: 0.75 (three composition) /

0.75: 1 1: 1

1: 0.75 0.75: 1 1: 1

 1: 0.75 0.75: 1 1: 1 1: 0.75

Table 1

40.0

0.06 0.08 0.065 0.05

five

2 Ostal

a little

3 Os.

tal

Table 2

160

162

163

170

173

176

155

153

157

145

120

149

140

105

139

650

652

648

645

640

648

642

638

645

640

638

645

651

645

648

3.8

4.0

A, 2

4.55

4.6

4.8

5.0

5.1 4.9 5.1 5.3 5.0 5.3 5.6 5.5

Claims (1)

Claim The raw material mixture for the manufacture of cellular concrete, including a binder, silica component, aluminum powder, additive and water, characterized in that. with the aim of intensifying gas evolution and accelerating the increase in the plastic strength of the raw material, it contains ground silica sand as a silica component, and as an additive, the product of processing filtration phosphate sludge with soapy liquor and caustic soda in the following ratio of components, wt.%: 5 1618742 6 Astringent 20-25 Aluminum 0.05-0.08 Ground powder quartz Additive 1-3 sand 40-45 5 Water Rest Components Table 1 Content, wt. X, in the composition control famous proposed 'I ² I ³ _____I ’ Astringent: cement lime 12 8 ” 13 _x 5 9 ~ 15 ΐδ “ 14 _x 4 9? B 9.8 15 ϊθ “ 12 8 ~ “ 9 · 15 7o Silica - th component 45.0 42.5 40,0 40,0 39.5 39.0 45-, 0 42.5 40,0 Poroobraeo- vatel 0.08 0,065 0.05 0.08 0,07 0.06 0.08 0,065 0.05 Additive - ' - - 1 3 5 - - - Additive* - -. - - - - 1 2 3 Water Os- The rest is Os- Os- Os- Os- Os- Os- Os- tal new tal .tal tal tal tal tal tal new new new new other new new new The product of processing filtration phosphate sludge with soapstone liquor and caustic soda with a ratio of sludge to soapstone liquor of 0.75: 1, 1: 1 and 1: 0.75 (three compositions). Table 2 Soi Ratio Time Time you Average Strength tav phosphate sewing hold raft- with hedgehog sludge to mixture, min to cut nost Tii, MPa a soapbox humpbacks kg / m ³ lye min 1 45 2 44 3 44 4 fifty 5 52 6 54 7 0.75: 1 42 '7 1: 1 38 7 1: 0.75 38 8 0.75: 1 40 8 1: 1 34 8 '1: 0.75 39 9 0.75: 1 36 9 1: 1 thirty 9 1: 0.75 35 160 650 3.8 162 652 4.0 163 648 .4,2 170 645 4,55 173 640 4.6 176 648 4.8 155 642 5,0 153 638 5.1 157 645 4.9 145 640 5.1 120 638 5.3 149 645 5,0 140 651 5.3 105 645 5,6 139 648 5.5