SU678036A1 - Concrete mix - Google Patents

Description

(54) CONCRETE MIXTURE

-, lg

invention (ethnically related to concrete mixtures that harden at low temperatures.

, Lime concrete mix, including cement, fine aggregate, coarse aggregate, additive- and water l.

The disadvantage of it is low strength. . ,, ,:::,: In addition, a concrete mixture is known that includes in weight%: cement-19, sand-27, crushed stone-44.4, water-7.6, and sodium nitrate -2, 2.

This mixture is the most highly qualified 6 by the proposed invention. Its disadvantage is low strength and frost resistance, as well as high cost of concrete. The purpose of the present invention is to increase strength at low temperatures and frost resistance, as well as reduce the cost of concrete.

This is achieved by the fact that a concrete mix, including cement, sand, crushed stone, nitrate, containing an additive

yu, contains as an additive waste engineering production with the following ratio of components in wt.%:

Cement9.25-22.66

Sand 15,52-32,97

Crushed stone42,25-61,54

Additive4.24-12.01

Water.the rest

In this case, the waste of machine building production includes in wt.%:

Sodium nitrate 12-17

Sodium Nitrite 0.5-1.0

Ammonium nitrate 0.1-0.3

Hydrate of sodium oxide O, 05-O, 1 Vodoostalnoe

 Waste engineering production is a waste solution of the electrochemical processing of aluminum alloys with sodium nitrate. The specific gravity of the solution is 1.06-1.12 g / cm. The waste is introduced into the concrete mixture in an amount of 2-8% by weight of cement, calculated on the dry matter. The minimum temperature of hardening, the concrete mix is -D ° C.

Four concrete mixes were prepared from Portland cement grade 40О, MOSCOW sand and limestone

rubble An additive of sodium nitrate was added to the first one, and the remaining three - waste of engineering production with different quantitative content, its constituent components. Siege:

Sodium nitrate

Waste - sodium nitrate - 15% sodium nitrite - 0.75% ammonium nitrate 0.2% sodium hydroxide - O, 08% water 83.97%

Ochghod - sodium nitrate - 12%

sodium nitrite - 0.5%

. -. - - ,; .

ammonium nitrate - O, 1% sodium hydroxide - O, O5% .- 87.35%

Waste - sodium nitrate - 17%

.

sodium nitrite - 1.0%

ammonium nitrate - 0.3% sodium hydroxide - OD% water - 81.96%

From tab. 1 shows that the increase in strength at negative temperature with the introduction of waste occurs much more intensively, the frost resistance of concrete -5 is 2-2.5 times greater than that of concrete with the addition of sodium nitrate.

In addition, concrete mixes of three compositions were prepared with a distinction of a standard cone of mixtures of 8-10 cm. The grade strength of concrete is 31 MPa. Samples were made from the resulting mixtures that harden at a temperature of –4 s. These samples were then tested for strength at 7.28 and 60 day old, as well as for frost resistance at 60 day old.

The test results are presented in table. one.

Table 1

23

75 79

250

76 80

24

240

quantitative content of the input shield in the mixture of components. Obrazhy were made of these mixtures and also tested for strength and frost resistance.

The test results are shown in Table. 2

2. Cement - 15.50 sand - 23.26 rubble - 53.14

6

Table 2.

270

81

77