SU783272A1 - Construction mix - Google Patents

Description

I

The invention relates to the production of building mixtures used for construction at negative air temperatures.

The known construction mixture, used for the production of monolithic concrete and reinforced concrete structures, hardening at negative temperatures, which contains portland cement, aggregates, water and antifreeze / additive. Calcium nitrite, calcium chloride nitrite, calcium nitrate with calcium chloride, etc. were used as additives. 1

The construction mixture used to make the Monolith is also known; at negative temperatures, which contains slag alkaline, aggregates and water 2.

 Domain granulated ground slag was used for the binder, and low modulus soluble glasses (alkaline silicates), a sodot mixture and caustic soda with a solution density of 1.1–1.3 g / cm were used to activate the slag.

The disadvantage of these building mixtures is their low strength at low temperatures.

The purpose of the invention is to increase the strength of the construction mixture at negative curing temperatures.

The goal is achieved by

10 that the spinning mixture, including slag & pulping, the filler And voow, additionally contains dimethyl sulfoxide in the following ratio of components, wt.%:

15

Slag alkaline to grubber 15-26 Zapolnitel64-77

Dimethylsulfoxide-O, 01-0, OZ

Water. Rest

20

Example 1, Experiment on compression according to GOST 10180-74 samples of building mixture of the following composition, wt.%:

783272

Slag alkaline to grit 15 Quartz sand,

with the modularity module MC -2,225

 carbonate.

, fractions, 5-20 mm39

Additive dimegulsul4yuksna0, 01

Water 20,99

At the same time test samples. prototype tax formulations.

Construction mixtures, tverzeyug at a negative temperature from –2O to - lasting 60 days 5 followed by hardening under standard conditions.

 Example 2. Compressive samples according to GOST 10180-74 are tested for constructional mixture samples of composition, wt.%: D

Slag alkaline to slanting26

Quartz sand with a modulus of particle size MIA- 2.231

Calcareous carbonate

fractions, 5-2О mm46 s

four

Additive dimethylsulfoxide, 03

Water2.97

At the same time test samples of the compositions of the prototype.

Building mixtures harden under the conditions specified in example 1.

Example 3. Testing for ezhatie according to GOST 10180-74 samples of the construction mixture on the slag alkaline in the next composition, wt.%:

Slag alkaline to live 20

Quartz sand with a modulus of particle size Mj (-2,228 Chirps, carbonate fractions, 5-20 mm - 43 Additive. Dimethyl sulfoxide 0.02 Water 8.98 At the same time, samples of similar compositions of the prototype are tested.

Solution mixtures harden under the conditions of example 1 ..

The results of testing the samples are given in the table.

 Upon the introduction of dimethyl sulfoxide in the amount of less than 0.01%, the hardening rate of the building mixtures at the specified negative temperature is similar to the hardening intensity without an additive.

With the introduction of dimethyl sulfoxide with a pain of 0.03%, the strength of construction mixtures decreases in the range of 10–15%. -50

Claims (2)

It is established that the addition of dimethyl sulfoxide in amounts of 0, 03% increases the strength of the mortar hardening at negative temperatures down to -50.55. Building mixture, including slag alkaline, aggregate and water, exe and, so that, with the aim of increasing strength at. negative hardening temperatures, she. additionally contains dimethyl sulfoxide in the following ratio of components, mass. %: Slag alkaline to a stranger 15-26 W & filler64-77 ; Dimethyl sulfoxide 0.01-0.03 Water Rest Sources of information taken into account during the examination 1. T. I. Rosenberg and others. Research of the processes of hardening of concrete with complex additives at a temperature below C. Second international symposium .. 5783272. eium on winter concreting. M., negative temperatures. Second time Stroiadat, 1975, vol. 1, p. 152-163. International Symposium on Winter Auto. 2. Glukhovsky V.D. and others. Hardening. M., stroiizdat, 1975, t. 1, concrete on slag alkaline in the living pr. 51-59.