SU833718A1 - Method of producing concrete mix - Google Patents

Description

(54) METHOD FOR PREPARING A CONCRETE MIXTURE

The invention relates to the construction, in particular to methods for preparing a concrete mix, used, for example, in hydraulic engineering for the manufacture of products from high-mobile (cast) concrete. A known method of preparing a concrete mix consists in mixing cement, filler (sand, gravel), water, and plasticizing agents, which use sodium salts of salicylic acid-formaldehyde copolymer or the product with mol. weighing 1500, obtained by condensation of pre-sulfonated aromatic benzoid hydrocarbons containing three benzoid rings with formaldehyde 1. The main disadvantages of the concrete mixture obtained in this way are significant consumption of water, cement and low compressive strength (up to 300 kgf / cm) of the resulting concrete. Plasticizing agent provides a somewhat greater mobility of concrete mixes (sediment cone 6-8.5 cm), but does not provide for the production of cast concrete (sediment cone more than 23 cm). The closest in technical essence and the achieved result to the proposed is a method consisting in mixing cement, filler, water and an additive - a mixture of sulfite alcohol and sodium silicate 2. Part of this method is the low technological effectiveness of the resulting concrete mixtures. The purpose of the invention is to improve the technological properties of the concrete mix. The goal is achieved by the fact that in the method of preparing a concrete mixture, which includes moving cement, mineral filler, water and sulfite-alcohol stillage, into the previously prepared mixture of components, after mixing it injected in an amount of 0.05-0.15% by weight of cement powder the addition of a polymer of a formula or polymer of resorcinol of the formula ON where h is 8-15.

To confirm the achievement of the objective of the invention, a concrete mix is used, including weight parts:

Cement1

Sand 0.8 /

Gravel2,1

 Water 0.389.

A known additive is introduced into this mixture, containing sulfite-alcohol bard (PRS) and sodium silicate corresponding to the transfer of cement, mineral filler, water and sulfite-alcohol bard, characterized in that, in order to improve technological properties, into a previously prepared mixture of these components after mixing with water it is introduced in an amount of 0.05-0.15% by weight of cement a powdered polymerphenol additive of the formula

in quantities of 0.15 and 0.15% of the weight per gallant, and the proposed addition of PRS and polymerphenol (PF), as well as additive PRS and polymer resorcinol (PR), respectively, in quantities of 0.15, 0.05 and 0.15% by weight of cement.

The properties of the concrete mix without additives (1) as well as mixtures obtained by the known (2) and proposed (3-6) methods are listed in the table.

where h is 8-15.

Sources of information taken into account in the examination

1. USSR author's certificate number 404809, cl. From 04 To 25/02, 1971.

2. USSR author's certificate

No. 385939, cl. C 04 B 13/24, G970 (prototype).

Claims (1)

Claim A method of preparing a concrete mixture, including mixing cement, mineral filler, water and sulphite-alcohol stillage, characterized in that, in order to improve technological properties, they are added in the amount of 0.05-0.15 to a pre-prepared mixture of these components after mixing with water. % by weight of cement, a powdery polymer additive of the formula Γζ ^ οηΊ or polymerresorcinol g he lA '* 1¼ of the formula [Ч ^ ОН where h = 8-15.