SU1240747A1 - Raw construction mixture - Google Patents

Description

one

Invention: relates to the composition of building mixtures and can be used in the production of artificial stones or slabs with a lower thermal conductivity.

The purpose of the invention is to reduce the stiffness of the molding material prepared from the mixture, increasing the fire resistance, frost resistance and heat resistance of products.

Raw construction mix contains the following components, wt.%:

Portland cement

Shredded wood waste

Chloride

calcium

Ash TPP Tripolyphosphate sodium 0,01-0,10, Water Else

Portland cement 24, 00-32.00 is used in the raw construction mix

12.00-13.50

0.50-2.50 30.00-35.00

Itlnog appointment GOST 10178-76,

TPP ash, which meets the requirements of GOST 25592-83, and sodium tripolyphosphate, GOST 13493-77 E. The mixture may contain sawdust or shavings with a particle size up to 10 mm as shredded wood waste.

The TPP ash in the above number prevents the aggregation of Portland cement particles during the preparation of the molding sand mixture, and also contributes to an even distribution of Portland cement in the bulk of the mass, which results in covering the surface of the crushed wood waste from the inorganic part (a mixture of Portland cement and TPP ash) that gives the finished product m high fire resistance. In addition, the use of TPP in the ash mixture leads to significant savings in Portland cement. The use of TPP ash in a mixture in an amount of less than 30.00 wt,% does not provide sufficient covering of the surface of shredded wood waste with an inorganic part, as a result of which a significant increase in fire resistance, frost resistance and heat resistance of products is not achieved. Use in a mixture of ash TPP in an amount of more than 35.00 wt.

2407472

leads to a significant reduction in the strength characteristics of products.

Sodium tripolyphosphate, injected with mixing water into mortar

5 in the process of its preparation, activates the surface of the crushed wood waste, revealing the closed surface pores of the latter, resulting in the smallest particles of Portland cement and TPP ash penetrating into the surface layer of wood waste and in the material of the products cohesion increases significantly, i.e. surface adhesion strength increases

 5 with each other particles of shredded wood waste. In addition, sodium tripolyphosphate improves the uniformity of pacni; :; dividing the inorganic components

20 of the proposed mixture (of portland cement and TPP ash), which contributes to the increase in ukrE) of the surface roughness of shredded wood waste, and therefore contributes to

25 fire resistance, frost resistance and heat resistance of products. The use of sodium tripolyphosphate in the proposed amount of less than 0.01 wt.% Does not provide a substantial activation of the wood waste surface, and therefore the material material’s cohesion is not achieved, and the products have relatively low strength characteristics, fire resistance, frost resistance and heat resistance. In addition, the use in the proposed mixture of sodium tripolyphosphate in an amount of less than 0.01 wt.% Does not lead to a substantial reduction in the rigidity of the molding material prepared from the mixture. The use of sodium tripolyphosphate in an amount of more than O, 10 wt.% Is impractical because it does not lead to any further improvement in the physicomechanical parameters of the proposed raw mix and the products obtained from it, but only leads to their appreciation.

35

45

50 Chloride portions in the raw mix in the specified amount not only plays the role of an antiseptic, but also helps to accelerate the hardening of the molded from the mixture of products, increasing their fire resistance and heat resistance by introducing it with the water. The use of calcium chloride in the amount of less than 0.50 wt.% Does not lead to a significant increase in fire resistance, frost resistance and heat resistance of products.

Raw building mixture is prepared as follows.

The estimated amount of Portland cement is first mixed with a calculated amount of TPP ash for 2 minutes and then with a calculated amount of shredded dry wood waste for 1.5 minutes. The calculated amounts of calcium chloride and sodium tripolyphosphate are pre-dissolved in the mixing water, which is introduced into the prepared dry mixture of ingredients.

The preparation of the proposed raw material mixture (molding material) is carried out in the SB-93 forced mixing unit at a speed of 80 rpm. Molding

13.50

The total amount of water that is mixed in includes water present in the ash of the hydroelectric power plant's thermal removal.

The samples were carried out on a vibropress, first with a dynamic effect of 50 g / cm for 10 s, and then with a static pressing of 250 g / cm for 10 s. Hardening of products and their drying is carried out in natural conditions (normal hardening). . The duration of normal hardening is determined by the achievement of concrete in samples of 70% resistivity. The regime of heat and moisture treatment of products from the proposed raw material mixture 2 + 3. + (isothermal aging at 90-95 ° C),

Table 1 shows the compositions of the known and proposed building mix raw materials.

In tab. 2 shows the physico-mechanical properties of the molding material

and samples made from it.

(, t and s l and c a 1

13.00 13.00 13.00 13.00

Editor I. Segl Nick

Compiled by N.P. eknna Tehred O.Sopko

Order 3451/19 Circulation 640 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, Projecto st., 4,

Table 2

Proofreader V. But ha

Claims (1)

RAW MATERIAL CONSTRUCTION MIXTURE, including Portland cement, chopped wood waste, calcium chloride and water, characterized in that, in order to reduce the stiffness of the prepared mixture of molding material, increase fire resistance, frost resistance and heat resistance of products, it additionally contains ash TPP and sodium tripolyphosphate in the following ratio of components, wt.%: 'Portland- cement Crushed 24.00-32.00 woody waste Chloride 12.00-13.50 calcium 0.50-2.50 Ash TPP. Tripolyphos 30.00-35.00 sodium fata 0.01-0.10 Water Rest > 1 1240747>