SU1571019A1 - Construction mortar - Google Patents

Abstract

The invention relates to the building materials industry and can be used in the manufacture of gypsum products. The purpose of the invention is to reduce the setting time of the solution. The mortar includes the following components, wt%: gypsum cementing β — calcium sulfate hemihydrate 100

high molecular weight lignosulfonates 0.2-0.7

water 34-60. The mortar has a setting time, min: start 6.30-10.0

end of 7.30-11.30

strength after 2 h, MPa: when compressed 5.1-8.8

at a bend 2,5-4,4. 2 tab.

Description

The invention relates to the building materials industry and may. to be used in the production of hypogean products.

The purpose of the invention is to reduce the setting time of the solution.

Example. For the preparation of mortar, the following raw materials are used: gypsum sticking to - / e - G-5BP calcium sulfate hemihydrate (GOST 125-79), high molecular weight lignosulfonates produced by Solikamsk Pulp and Paper Mill (10%

solution).

The physicochemical properties of high-molecular lignosulfonates are given below:

Density, kg / m 1,084

Molecule

mass5000-20000

Mass fraction of dry matter in still with TV, Mass fraction of ash to mass of dry substances, Mass fraction of reducing substances to mass of dry substances,%

21.9

9.4

CD vj

0,69

WITH

Mass fraction of the main substance (LST),% 5.9 PH4.15 Into the mixer, pour a metered amount of water8, an additive of high molecular weight lignosulfonatosis, and mix. Then, the gypsum plaster is poured into the resulting solution and stirred for 0.5 min. From cooked

the solution is molded samples. The size of cm, which is tested according to GOST 2 3789-79.

The compositions of the mortar HV, its main physical and mechanical properties are shown in the table.

As follows from the above data, the mortar has shorter setting times and high mechanical strength. For the invention

qi, water and a plasticizing agent, characterized in that, in order to shorten the setting time, as a plasticizing agent, it contains high molecular weight lignosulfonates in the following ratio of components, wt.

Gypsum Sulphate Suspension / 5-Hemihydrate

calcium 100

High molecular weight

Claims (1)

Claim Mortar, including binder - p, calcium sulfate hemi-hydrate I which consists in the fact that, reducing the time grasping as a plasticizing one, it contains high molecular weight data more and more 100 tsiya, water and a plasticizing additive, and for the purpose, he additives lignosulfonates in the following ratio of components, wt.h Gypsum binder / 5-calcium sulfate hemihydrate! High molecular weight lignosulfonates Water 0.2-4), 7 34-60 ~ ί ---- Experience Solution composition wt.h Water The plasticity of the solution, cm The strength of the samples after 2 hours of hardening, MPa Setting time, min Gypsum binder Plasticizing additive Start the end on compression when bending 1 100 - 43 12 7.1 3,5 6.30 7.30 2 100 0.1 40 12 7.6 3.8 6.30 7.30 3 100 0.2 36 12 8.8 4-, 4 6.30 7.30 4 100 0.3 35 12 9.2 4,5 7.00 7.30 5 100 0.5 34 12 9.0 4,5 7.00 7.30 6 100 0.7 34 12 7.9 4.0 7.00 9.30 7 100 1,0 34 12 7.0 3,5 10.00 11.30 8 (on carried t 100 0.1 SDB 40 12 7.6 3,5 10.30 12.00 ny) 9 (from - west- 100 0.3 SDB 37 12 8.0 4.0 13.30 16.00 ny) 10 100 fifty 18 5.1 2.6 8.00 9.30 eleven 100 0.1 47 18 5.7. 2,8 8.00 9.30 12 100 0.2 45 18 6.3 3.2 8.00 9.30 thirteen 100 0.3 44 18 6.9 3,5 8.00 9.30 14 100 0.5 43 18 7.2 3.6 8.00 10.00 fifteen 100 0.7 42 18 7.0 3,5 9.30 11.30 16 100 1,0 42 1-8 5,6 2.9 1 1, 00 13.00 17 (Javest- 100 0.1 SDB 47 18 5.8 2.9 1 1, 30 13.30 ny) 18 (known 100 0.3 SDB 45 18 6.0 3.0 15.00 18.00 ny) 19 100 60 25 4, -3 2.2 10.00 11.30 20 100 oh g ' 58 25 4,5 2.2 10.0 11, 30 21 100 0.3 56 25 5.1 2,5 10.00 11.30 22 100 0.5 54 25 5,6. 2,8 10.00 11, 30 23 100 0.7 53 25 5.5 2.7 10.30 12.00 24 100 1,0 53 25 5,0 2,5 12.00 14.00 25 (invest 100 0.1 SDB 58 25 4,5 2.2 13.00 15.00 ny) 26 (known 100 0.3 SDB 56 25 4.9 2,4 16.00 20.00 ny)