SU1615167A1 - Method of producing concrete mix - Google Patents

Abstract

The invention relates to the building materials industry and can be used in the preparation of concrete mix. The purpose of the invention is to increase the strength of concrete. In a high-speed mixer with a speed of 6.0-9.0 m / s, sand with cement is activated first for 10-25 seconds, then 15-30% of water by weight of cement is introduced and activation continues for 35-50 seconds, after which the resulting mixture served with the rest of the water in a low-speed mixer, where it is mixed with coarse aggregate. 1 tab.

Description

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with

The invention relates to the building materials industry and can be used in the preparation of concrete mixtures.

The aim of the invention is to increase the strength of concrete.

Example. For the preparation of the concrete mix, the slag Portland cement M 400 is used as a concrete mixture, and the fine aggregate is sand with a modulus of micron size. 1.53, coarse aggregate - granite crushed stone fraction 5 - 20 mm.

A concrete mixture is selected from the above materials, the mobility of which is OK 1-5 cm, when prepared according to known technology after 28 days of natural hardening, the strength of concrete is 20 MPa. The consumption of material for the preparation of 1 m of concrete is C: P: N: C 280: 618: 1293: 192 kg.

All the baking and cement required for kneading are fed to a high-speed mixer, where they are jointly treated for 10-25 ° С. Processing of dry components provides for the amorphization of the surface of the fine aggregate and the destruction of the hydrated film of cement with simultaneous additional grinding of the latter. After dry treatment, a part of water is supplied to the high-speed mixer, in an amount of 15–30% by weight of cement and treated for another 35–50 s, the alkalinity of the medium increases due to the presence of cement, and the solubility of the amorphized fine aggregate surface increases dramatically.

01

05

H

which interact with

Calcium hydroxide calcium rim CACOH, which is present in cement, forms calcium hydroxyl silicates. The resulting mixture, with the remainder of the water required for the kneading, is then fed to a concrete mixer pre-loaded with coarse aggregate, which is further stirred by the dM until a homogenous mix is obtained. The entire activation process is pro-, proceeds at a speed of 6.0-9.0 m / s.

The test results are shown in the table.

15

F

The formula of the invention. A method for preparing a concrete mix, which includes the activation of mixing water, sand and cement in a high-speed mixer, followed by mixing the resulting activated mixture with coarse aggregate in a low-speed mixer, so that, in order to increase the strength of concrete, in a high-speed mixer At a speed of .9.0 m / s, sand is first activated with cement for 10-25 seconds, then 15-30% of water by weight of cement is added and activation continues for 35-50 seconds, after which the mixture is fed with the rest of the water in a low-velocity mixture single piece.

Claims (1)

The formula of the invention A method of preparing a concrete mixture, including 5 a growth mixer of sand and cement with mixing the resulting mixture with coarse aggregate in a low-speed mixer, which requires that, in order to increase the strength of concrete, in the high-speed mixer, sand is first activated at a speed of 6.0 .9.0 m / s with cement for 10 to 25 s, then 15 enter 15-30% of water by weight of the cement and continue activation for 35-50 s, after which the resulting mixture is fed with the rest of the water to a low-speed mixer. Experience Stage number Activation speed The content of activated components W / c number 2 by weight of cement water X of the total Activation time Concrete compressive strength, MPa The increase in concrete strength, X Comrade X Sand Cement m / s rpm Dry With water 1 7.6 145.2 25 100 0.2 20 33.3 15-20 45-40 21.8 9 2 7.6 145.2 fifty 100 0.2 20 33.3 15-20 45-40 22.4 12 3 1 7.6 145.2 75 100 0.2 20 33.3 15-20 45-40 27.8 39 4 7.6 145.2 100 100 0.2 20 33.3 15-20 4 5-40 31.8. 59 5 7.6 145.2 100 100 0.05 5 8.3 15-20 4 5-40 21.7 8.5 6 7.6 145.2 100 100 oh 1 . 10 16.7 15-20. 45-40 26,4 32 7.6 145.2 100 100 0.15 fifteen 25 15-20 45-40 sz, 1 ‘65 ( 8 2 7.6 145.2 100 100 0.20 20 33.3 15-20 45-40 33.1 65 ' 9 7.6 145.2 100 100 0.25 25 41.7 15-20 45-40 32.6 63 ; 10 7.6 145.2 100 100 0.30 thirty fifty 15-20 35-40 30.3 53 1 7.6 145.2 100 100 0.35 35 58.3 15-20 45-40 24.6 23 I 12. 7.6 145.2 100 100 0.67 67 TOO 15-20 45-40 21,2 6 ΐ 13 5, 97.5 100  100 0.2 20 33.3 15-20 45-40 23,4 17 ' 14 6.0 114.6 100 100 0.2 20 33.3 15-20 45-40 28.6 43 i 15 3 ⁷ 6 > 45.2 100 100 0.2. 20 33.3 15-20 4 5-40 33.1 65 : 16 9.0 172 • 100 100 0.2 20 33.3 15-20 45-40 29.4 47 ί 17 10.3 196.8 100 100 0.2 20 33.3 15-20 45-40 22.7 thirteen ί IB. 13.1 250.3 100 100 0.2 20 33.3 15-20 45-40 18, B 6 19 7.6 145.2. 100 · 100 0.2 20 33.3 0 60 21.6 8 20 7.6 145.2 100 100 0.2 20 33.3 5 65 23.8 19 21 7.6 145.2 100 100 0.2 20 33.3 10 fifty 28.3 41 22 7.6 145.2 100 100 0.2 20 33.3 fifteen 45 331 65 23 7.6 145.2 100 100 0.2 20 33.3 20 40 30.5 52 24 7.6 145.2 100 100 0.2 20 33.3 25 35 29.6 48 25 4 7.6 145.2 100 100 0.2 20 33.3 thirty thirty 28.8 44 26 7.6 145.2 100 100 0.2 20 33.3 35 25 28.6 43 27 7.6 145.2 too 100 0.2 20 33.3 40 20 22.6 thirteen 28 7.6 145.2 - 100 100 0.2 20 33.3 10 60 28,4 41 29th 7.6 145.2 100 100 0.2 20 33.3 20 60 29.5 68 thirty 7.6 145.2 100 100 0.2 20 33.3 thirty 60 24.6 23 31 11.9 520 25 too 0.67 100 67 45/50 22.4 12 32 5 11.9 520 fifty 100 0.67 100 67 - 45/50 24.6 23 33 11.9 520 75 too . 0.67 too 67 - 45/50 25.3 26