SU1689369A1 - Method of preparing binder for concrete mix - Google Patents

Abstract

/ cobweb 01 was worn to the production of building materials, and in particular to methods of preparing hushugo for an oeton mixture used in the manufacture of monolithic and pre-cast concrete and reinforced concrete products and structures. The aim of the invention is to increase the effective effect of the concrete mix on its uniformity and strength The method consists in processing the water solution cv of the plasticizer by mixing it with the adsorbent in a ratio of 1- (1 6} over a dry powder container when mixing the treated soup parts of the fixer with portland cement bopolitano BYODOT, with VM | YUchs t Mdu f, G, a. UU- - C. l 11-50 U l -unos 2 (; 73 .g / 4soo5en superp-pspfikyu1) (by i am 2–30 G, the agility is concreted. The composition is dp P5 cm. The coefficient of strength gration is cucTap / intT 8 12 compressive strength from “Tet / ht D in p: st 23 days to 55 MPa 4 melts

Description

The invention relates to the building materials industry, in particular to the holdings for concrete bolds used in the manufacture of monolithic and precast concrete and reinforced concrete products and structures.

The aim of the invention is to increase the plasticizing effect of the concrete mix, its homogeneity and the strength of the concrete.

For the implementation of the method, Portland cement with an activity of 38 MPa and fly ash from electrostatic precipitators are used, its density is 2.2 g / cm2, specific surface area is 450. .550 m / kg, lime absorption activity from ragworks 53 mg CaO. Fly ash is also used as a liquid adsorbent.

Another glue and a uniform distribution in the fuel cell. Another adsorbent can be fine-grained waste and asbestos from cement production. Asbestos-cement waste is a lumpy bulk material with a bulk density of 50 ..300 kg / m, which is easily crushable. Asbestos cement waste consists of hydrates of three calcium and two-calcium silicates, calcium aluminates and asbestos hair. The chemical compositions of the adsorbents are given in table 1

The additive is prepared by mixing the finely dispersed adsorbent with 30 to 40% liquid plasticizer C-3 brought to

ABOUT

with y

CJ

oh oh

homogeneous state, then dried at 30 ... 50 ° C.

The composition of the additive is given in table 2.

The resulting additive is mixed with the components in the slurry and mixed together.

Pre-mixing of fine fly ash or asbestos-cement waste with liquid

superplasticizer C-3 followed by drying the mixture and joint grinding of the components creates a high effect of lowering the surface energy due to chemisorption of molecules C-3 on the adsorbent grains, which ensures intensive formation of new surfaces during grinding, increases the homogeneity of the substance and creates a high plasticizing effect when used in a slurry in mortar and concrete mix.

The final mix is carried out in a ball, jet or jet mill,

To determine the compressive strength and bending, a mortar mixture is prepared in a mixture of sand in a ratio of 1–3 with a taper of 107–110 mm. From the resulting mixture, beams are formed in the size of 4x4x16 cm, vibrate and stored in air-humidity conditions at 25 ± 2 ° C. Construction and technical properties of the recipient are determined according to GOST 310.1-81..1310.4-81.

The resulting eolocomous quads with additive are fast-hardening.

(the beginning of the setting is 1-10 ... 1-30 h-min, the end of 3-5 h), withstand the uniformity of the volume change.

The compositions in the field and the main construction and technical properties are given in table 3.

Comparative data of homogeneity (coefficient of variation) on the strength and mobility of the mixture when, 4 proposed and known in the sheer are given in table 4.

Claims (1)

Claims A method for preparing a concrete mixture in a concrete mixture, comprising treating an aqueous solution of a superplasticizer with a finely ground mineral adsorbent from the group: fly ash, asbestos-cement waste and mixing it with portland cement, characterized in that, in order to increase the plasticizing effect of the concrete mix, homogeneity and strength of concrete; an aqueous solution of a superplasticizer is treated by mixing it with an adsorbent in the ratio of 1- (1.6) on a dry basis, dried, and when mixed, processing This superplasticizer with Portland entrant additionally introduces fly ash, and the binder includes, in wt.%: Portland Cement 20-50 Fly ash 20-78 Specified processed superplasticizer2-30 Table 1 WITH . Table 2 Note. The composition of the prototype used a 2% aqueous solution of C-4 in the amount of 1% by weight of ash. The proposed formulations 132but 135 "C 13218 135-MO 133tio 136ti2 Prototype 120 + 20 124124 TableA