SU1618739A1 - Initial composition for producing asbestos-concrete articles - Google Patents

Description

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(21) 4450937/33

(22) 06.28.88

(46) 07.01.91. Bul P 1

(71) Mordovia State University. N.P. Ogareva

(72) V.I. "Solomatov, V." D. Cherkasov, V.P. Seliv, B0G. Sharov, V.A. Rusakov, V.I. Trokhin and G.I. Chernov (53) 676.618 (088.8) (56) USSR author's certificate No. 707116, are. From 04 To 28/02, 1978.

USSR Author's Certificate No. 1260350, class From 04 To 28/00, 1984.

(54) RAW MATERIALS FOR MANUFACTURING ASBESTOCEMENT PRODUCTS (57) The invention relates to construction materials, namely, compositions for the manufacture of flat and embossed small sheets. In order to increase strength and reduce water absorption, the raw mix for the manufacture of asbestos-cement products contains, in wt%: portland cement 63-70.4; wet asbestos cement waste 25.3-34.5; distillation residues produced by ethyl celloslose 2.5-4.3, Lsbest cement products with a density of 1600 - 1605 kg / m3 have a flexural strength of 14.35-12.43 MPa, water absorption 13-11%. 2 tab.

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The invention relates to building materials, namely, compositions for the manufacture of flat and embossed compact sheets,

The purpose of the invention is to increase the strength and reduce water absorption.

Used wet asbestos cement wastes are deposited on the sediments of asbestos-cement mass deposited in the lower parts of the h. Recuperators and contain 16-21% chrysotile asbestos (calculated on the dry matter), as well as unhydrogenated residues of clinker materials; , C2S,, and fine-dispersed CaC03, Ca (OH) 2. The chemical composition of wet asbestos cement waste,%: CaO 45; SiOz 15; F203 6; MgO 4; A1g03 2; S03 2.5; R02 11.5; ppt 14.

The initial moisture content of asbestos-cement waste is 90%. The specific surface area of wet asbestos-cement waste after drying to a moisture content of 6% (degree of fluffing) is 400-600 m2 / g,

As the physico-chemical characteristics of the plasticizer, bottoms production of ethyl cellosolve. The following indicators are accepted: d is the substance density at 20 ° С relative to the density of water at 4 ° С, n is the refractive index of the substance at 20 ° С.

Distillate production of ethyl cellosolve is a dark-brown liquid, having the following physiotherapy, 2O

Co-chemical characteristics: d. 1.05-1.08; 1.457-1.458, viscosity 87-89 10 e Pa “s. Chemical

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The composition of the bottoms is as follows, wt%: (1) - C2H5-0-0 C2H4-OH traces; (Ii) C2HG-0-C3H4-0-C2H4-OH 34-43; (Hi) - CzVIs - 0-C2H1.-0-C2ll4-0-C2H4.- OH 45-49; (IV) -.СгНг-0-Сг1Ц ..- 0-С2Н «гO-СгН4-0-С2Н, к-ОН 9-12; (V) cn5-o-cgn4-o-CЈH4-o-cgn4-o-cgnf0-CgN4-OH 3-5.

In the raw mix, use the product: t with the following indicators:

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and 1.06; rij, 1.458, viscosity 88-1CTJ Pa-s, I traces, II 382, III 48%, IV 10%, V 4%.

Example. Portland cement is added to wet asbestos cement waste, dried to a moisture content of 6%, fluffed and sieved to a particle size of 2.5 mm. The mass is mixed, then moistened to 16–20% and a cube is introduced, as is the residual production of ethyl cellosolve. After thorough mixing, the mass is molded by pressing under a pressure of 20 MPa.

In order to shorten the duration of the preliminary stage of hardening asbestos-cement products, a heat and moisture treatment is applied in a steam chamber. The chamber is kept at a temperature of 60Ј3 ° C and the OT is the air humidity of 85- ± 5%. The duration of heat and moisture treatment of the product is 4 hours.

Wet asbestos-cement wastes, like low-grade asbestos, are practically not used in the production of asbestos-cement products and are thrown into dumps, land plots are clogged. By semi-dry molding, flat or raised small-sized asbestos-cement sheets (tiles) can be obtained from raw mixtures based on dried moist asbestos-cement wastes. With this method of production, a high pressing pressure is required, in addition, the product

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have insufficient strength. Therefore, the composition of the raw material mixture contains distillation residues from ethyl cellosolve production, which plasticize the mixture. At the same time, the pressing pressure decreases by about 50 kg / cm2.

The bottoms produced by the production of ethylcellulose have an effect on increasing the strength of asbestos-cement products, have a better water-holding capacity than methylcellulose, which ensures good conditions for the hardening of asbestos-cement products with low humidity, and is also capable of combining with cement components in hydroxyl groups As a result, a polymer cement is formed, which increases the strength of the products.

Table 1 shows the compositions of the proposed and known raw material mixtures, Table 2 shows the physical and technical characteristics of the products.

Claims (1)

Invention Formula Raw mix for the manufacture of asbestos-cement products, including Portland cement, wet asbestos-cement waste and plasticizer, which means that with a chain of increasing strength and reducing water absorption, as a plasticizer it contains bottoms produced by ethyl cellosolve in the following ratio of components, wt.% : Portlandcement63, 0-70.4 Wet asbestos-cement waste25.3-34.5 Vat residues produced by ethyl- cellozolve 2.5-4.3 Table 1