SU823337A1 - Concrete mix - Google Patents

Description

The invention relates to hydraulic engineering, irrigation and road construction and can be used for the manufacture of precast concrete, which is subject to the required tensile strength. The known concrete mixture, incl. Cement, water, and a filler of a smooth form (flat or needle-like) 11 However, the use of a filler of this shape makes it difficult to compact the concrete of the NOW mixture, and the tensile strength decreases. Closest to the proposed technical substance and the achieved result is concrete mix 2 including, by weight.h .: Cement175-275 Sulfoaluminate 21.5-29.1 calcium 0.790-1.06 Lignosulphate 0.09-0.12 Methylcellulose Siliconate nat0 , 000035, Chlorine mag0, 056-0.076 A disadvantage of the known concrete mix is the low compressive strength of the obtained products. The purpose of the invention is to increase the tensile strength of the products obtained. The goal is achieved by the fact that a concrete mixture, including cement, aggregate, water, lignosulfonate and methylcellulose, contains sand and gravel as a filler, forms a sulphite-yeast mash as lignosulfonate, and methylcellulose as a 1% aqueous solution viscosity 75-80 spz. in the following ratio of components, parts by weight: Cement205-275 SandG50-698 Grain of grains1370-1407 Sulphite yeast: wa frost 0.14-0.4 Methylcellulose 0.7-0.2 Water 125-135 Quantitative content of grains of earthen form this is regulated because their presence noticeably reduces the mechanical properties due to the blinding effect (accumulation of a part of water on the lower surface of the aggregate during vibration). Rationally chosen sulphite-yeast ratio

 And methylcellulose of a given viscosity (of a specific molecular weight, since the viscosity of a 1% solution is a characteristic of it) makes it possible to eliminate this phenomenon,

Example. Concrete mix maintains: APD-300 brand cement medium sand (mod size 2.65), gravel size up to 40 mm (with averaged geometric parameters of grains of grains: length - 22 mm, width - 12.6 mm, thickness - 6.40 mm), water-soluble cellulose ether (methylcellulose) produced by the Vladimirsky pilot plant

. a scientific research institute of synthetic resins with a viscosity of a 1% aqueous solution of 153 s and a solubility in water of 99.7%; a sulphite yeast brew according to OST-81-79-74-74.

The method of preparing the concrete mix is in the usual mixing of the components. The plasticizer is added with the mixing water. The pre-water soluble cellulose ether is dissolved in water and filtered through a fabric filter.

In tab. 1 shows the compositions of the proposed concrete mix, Table 2 shows their characteristics.

Table

24.7

3.8 25D 3.6

more than 200 30-35

6V 7-8 more than 200 25-30

Claims (2)

Claim A concrete mixture comprising cement, aggregate, water, lignosulfonate and methyl cellulose, distinguishing c. I mean that, in order to increase the tensile strength of the products obtained, it contains sand and flaky gravel as a filler, sulfite-yeast mash as lignosulphonate, and methyl cellulose in the form of a 1% aqueous solution of mastic mash methyl cellulose Water Sources with a viscosity of 75-80 cps in the following ratio of components, parts by weight: Cement 205-275 Sand 650-698 Flaky gravel 1370-1407 Sulphite-jitter 0.14-0.4 0.7-0.2 • 125-135 information taken into account during the examination 1. Trushko IM and others. The structure and strength of road cement concrete. Kharkov, 1965, p. 11-17. 2. US Patent No. 3663287, cl. From 04 to 11/08, published. 1972. VNIIIPI Order 1993/28 Circulation 660 Subscription Branch of PPP Patent, Uzhgorod, Project 4,