SU914533A1 - Concrete mix - Google Patents

Description

The invention relates to construction materials, in particular, to the compositions of concrete mixtures used in aggressive environments of agricultural premises, in the construction of hydraulic structures, as well as in industrial, civil and road construction.

Known concrete mix [1], which as an additive contains, wt%:

ten

Bitumen

Caustic soda Sour tar Water

20-40

0.6-2.0

Wu

Rest

The concrete mixture, including Portland cement, sand, water and a complex additive, is closest to the invention according to the technical essence and the achieved result. As a complex additive, the concrete mix contains a 50% concentration emulsion of aluminum powder, sulfite-alcohol stillage, and bit15

20

2

ma in the amount of 5 ~ 6% by weight of portladcement in the following ratio of components of the additive, respectively, from 0.005: 0.1: 1 to 0.01: 0.1: 1 [2].

A disadvantage of the known concrete mixes is the high water absorption of concrete.

In addition, the effect of compacting the structure of concrete during gassing due to aluminum powder in the composition of the complex additive occurs only under conditions of heat and moisture treatment, and when hardening in natural conditions, the effect of a gassing additive is eliminated, while the presence of unreacted aluminum particles in the concrete body excludes the possibility of using such concrete aggressive environments, chemically active with respect to aluminum.

The purpose of the invention is the reduction of water absorption and increase the resistance of beta

on in aggressive environments nitroammo914533

Fosco pH 3.9 ^_ 4.7 superphosphate and pH 2.4-3.2.

The goal is achieved by the fact that concrete, a mixture comprising Portland cement, sand, bitumen and water, additionally contains sodium abietat in the following ratio of components, mash.%:

Portland cement 21.70-28.90

Sand 57.80-65.0

Bitumen 6.50-8.67

'Abietat sodium 0,10-0,13

Water Rest

The proposed concrete mix is prepared as follows.

Portland cement is mixed in a concrete mixer, for example a forced action, for 3 ~ 4 minutes and then bitumen emulsion is introduced with mixing water. When this is taken into account in the amount of mixing water, the amount of water contained in the asphalt

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Components The composition of the mixture Proposed Famous one 3 Portland cement 28.90 25.30 21.70 26.9 Sand 57.80 61, 40 65.00 53,88 Bitumen 8.67 7.58 6.50 1.35 Sodium abietta 0.13 0.12 0_, 10 - Water 4.50 5.60 6.70 17,728 PRS - - - 0.135 Aluminum powder - - - 0,007

15

emulsion. The mixture is stirred until a homogeneous mass.

The hardening of the molded products from the proposed concrete mix can be ensured both during heat and moisture treatment and under natural conditions.

Bitumen emulsion on the emulsifier sodium abietata prepared from low-melting bitumen in the following ratio of components, wt.%:

Bitumen 50 ^_ b0

Sodium Abietat 1.05 "1, 5

Water Rest

by feeding to the disperser dissolved in hot water (1 = b0 ~ 70 ° C) sodium abietata and bitumen melted at 120-140 ° C.

Examples of the quantitative composition of the proposed concrete mix and known are given in table. one.

Table 1

Comparative physico-mechanical prepared from the proposed and well-known indicators of concrete samples, with ⁴⁵ concrete mixes are given in Table. 2

five

914533

ί Table 2

Composition

Indicators proposed famous one 2 " 3 Water absorption,% 0.6 1.2 1.5 4.0 Concrete compressive strength expressed in% of the initial (Noah strength taken as 100% after 6 months of storage in aggressive environment · one nitroammofoski pH 3.9-4.7 107.0 108.4 109.8 102.1 superphosphate pH 2.4-3.2 105.0 106.9 108.7 101.4 water pH 8-10 Same after 12 months storage 109.0 110.0 .110,3 110.5 in a hostile environment nitroammofoski pH 3.9 "4.7 93.0 95.2 · 97.6 84.0 superphosphate pH 2.4-3.2 115.0 116,0 116,8 101, 2 water pH 8-10 110.0 109.4 108.9 h about l The same, after 24 months of storage in an aggressive environment nitroammofoski pH 3.9-4.7 92.0 94.9 97.2 81.3 superphosphate pH 2.4-3.2 118.0 119.4 120.2 104.4 water pH 8-10 The strength of concrete bending, expressed in% of the original after 6 months of storage in ag 112.7 113.8 114.3 109.2 ressive environment nitroammofoski pH 3.9 "4.7 109.0 107.7 106.9 101.3 superphosphate pH 2.4-3.2 100.0 100.0 100.0 99.4 water pH 8-10 The same, after 12 months in the environment .108.0 108.4 108.8 105.4 nitroammofoski pH 3.9 * 4.7 96.0 93.4 91.0 85.4 superphosphate pH 2.4-3.2 111.7 110.0 110.0 100.8 water pH 8-10 Same after 24 months in the environment 111.4 110.0. 109.2 105.9 nitroammofoski pH 3.9 "4.7 94.2 91.0 88.0 83.4 superphosphate pH 2.4-3.2 119.0 117.0 115.0 103.7 water pH θ-Yu 109.2 110.5 111.4 107.4

Ί. 914533 8

Thus, in environments with a pH of 3.9 ”4.7 for 24 months, the loss of compressive strength of concrete prepared from the proposed mixture is 2–6 times and for bending is 1.4–2.8 times less, ₅ than for concrete based on a known mixture.

In aggressive environments with a pH of 2.4-3.2 for 12 and 24 months, the compressive strength of concrete prepared from the proposed mixture is, respectively, 14% and 15%, and the flexural strength, respectively, is 12% and 16% higher compared to concrete on the basis of a known mixture. 15

The application of the proposed concrete mix allows you to get corrosion-resistant concrete with low water absorption.

Claims (1)

Claims lo Concrete mix, including port-, land cement, sand, bitumen and water, characterized in that, in order to reduce water absorption and increase the durability of concrete in aggressive media of a nitroammophone pH 3.9 ~ 4.7 and superphosphate pH 2.4-3.2, it additionally contains sodium abietat in the following ratio, wt.%: Portland cement Sand Bitumen Sodium Abietta Water 21, 70-28.90 57.80-65.00 6.50-8.67 0.10-0.13 Else