SU1379277A1 - Concrete mix - Google Patents

Abstract

The invention relates to the production of building materials, in particular to the composition of concrete mixtures used in concreting in winter conditions. The purpose of the invention is to slow down the setting time, increase the mobility of the mixture and slow down its loss over time, as well as increase the strength of concrete during hardening under positive and negative temperatures. The concrete mix includes the use of lignosulfonate in the following ratio of components, wt.%: Portland cement 12.35-18.30; crushed stone 45.76-50.52; sand 25.21 - 28.53; potassium carbonate 0.99-2.20; sodium tetraborate 0.09-0.19; lignosulfonate 0.07-0.12; water the rest. Concrete has a compressive strength after 28 days at 20 ° C 46.0 MPa, at -25 ° C 27.5 MPa. 3 tab. with (L

Description

oo soy vj

The invention relates to building materials, in particular to the composition of concrete mixtures, use nEIX when concreting in winter conditions.

The purpose of the invention is to slow down the setting time, increase the base of the mixture and replace its loss over time, and increase the strength of concrete when hardening under positive and negative temperatures.

Concrete mix is prepared from Portland cement M-400, silica sand with 2.1 and crushed stone of granite fraction 10-20 mm. The components of the additive are stored separately and injected with shutter water into the concrete mix just prior to its preparation.

The resulting concrete samples are placed in a normal hardening chamber and in a chamber in which a constant negative temperature is maintained,

Data on the timing of the seizure and loss of mobility are presented in Table. one; The compositions of the concrete mix without additives, with known and proposed complex additives - in Table. 2;

the conditions for the hardening of the concrete mixture and the strength characteristics of the samples in Table 3,

Claims (1)

Invention Formula Concrete mixture containing Portland cement, crushed stone, sand, potassium carbonate, sodium tetraborate and water, characterized in that, in order to slow down the setting time, increase the mobility of the mixture and slow its loss in time, as well as increase the strength of concrete when hardening under conditions positive and negative LH temperatures, it additionally contains lignosulfonate in the following ratio, wt.%: Portland cement Rubble Sand Potassium carbonate Sodium tetraborate Lignosulfonate Water Table 12.35-18.30 46.76-50.52 25.21-28.53 0.99-2.20 0.09-0.19 0.07-0.12 Else 1 22-30 5-20 50-58 2-31 83-10 4-42 12.5051.13 28.87 15,0050,50 27,00 43 6O 129 table 2 7.50 7.50 3 (control: Continuation of table 2 Brac Ok see 12 12 Hardening temperature with 20 -15 -25 20 -15 -25 20 -15 -25 1 table 3 The strength of the samples, MPa, at the age, days one 25.6 21.8 12.9 31.5 26.3 15.8 38,8 31, 8 19.4 28 56 30.2 26,134,8 18,831,5 36.9 31,032.1 22,838,5 46.0 38,751,6 27,547,3