RU1799859C - Binder - Google Patents

Abstract

Essence: containing thickening, wt.%: Portland cement clinker 55-75, carbonate-barium tails 15-25, zinc slag 10-20. The cement is prepared by joint grinding of these components to a specific surface of 300-320 m2 kg, the coefficient of corrosion resistance in 3% of MgS04 is 1.13. 2 tab.

Description

The invention relates to the production of cementitious materials based on Portland cement and can be used in the building materials industry to produce high-strength and sulfate-resistant cement.

The purpose of the invention is to increase the sulfate resistance and simplify the technology while maintaining strength in the binder.

This goal is achieved in that in the cement, including Portland cement clinker, carbonate-barium tails, additionally contains zinc slag in the following ratio of components, wt.%: Portland cement clinker55-75 Barium carbonate tails 15-25 Zinc slag 10-20 V the following materials are used as raw materials

1. Portland cement clinker of Chimkent cement plant with the following mineralogical composition, wt.%: SzZ60-62 C2S 18-18

SzA5-6 6-8 The rest 10-11 2. Carbon-barium tails having the following chemical composition, wt.%: SI02 10.4-12 CaO 24-26 Re20z 1.5-3.5 0.4-1, 5 MdO 12.5-14 NaaO 3-5 5Sm 4.5-5.5 VaO 10-13 Barium carbonate tails are a finely ground technical product with a specific surface area of 230-290 m / kg, the annual yield of which is 1.2- 1.5 million tons

3. Zinc slag having the following chemical composition, wt.%: Si0227-35 CaO 17-19 4-6 FezOs 21-25 MdO 6.6-10.8 R20 0.8-1.2 pp 8.2-10.3 This slag, as a result of quenching, has mainly glassy trout

with

VI

you

mu with a predominant amount of melelite composition. Ferrous iron is contained in the glass phase.

The mineralogical composition of zinc production slag: glass phase - 50-62%, / - quartz 15-18%, hematite and magnetite - 7-11%, calcite 4-7%, okermanite 3-6%, unburned carbon up to 6%. The content of non-ferrous metals: Pb 0.03-0.05%, Zn 0.15-0.42%.

Of these components, three compositions are prepared in weight, wt.%:

. II III Portland cement clinker 75.0 65.0 55.0 Barium carbonate tails 15.0 20.0 25.0 Zinc slag 10.0 15.0 20.0

They are prepared by joint grinding of Portland cement clinker, carbonate-barium tails and zinc slag to a specific surface area of 300-320 m2 / kg.

Astringent activity was determined after 28 days of normal hardening. The manufacture, storage and testing of samples is carried out in accordance with GOST 310.4-4-81 g,

When determining the sulfate resistance of binder, the samples are formed with a size of 1x1x3 cm. Cement and sand are taken in the ratio 1: 3.5 by weight for their manufacture. After 28 days. of normal hardening, the samples are placed in a 3% solution of MDSM; they are incubated for 12 months in a sulfate medium. The sulfate resistance coefficient is determined by the following formula

TO

Re

0

5

0

5

0

5

where Rszh is the compressive strength of samples subjected to sulfate aggression for 12 months, MPa,

 - compressive strength of samples at an equivalent age, MPa.

The test results are shown in table 1, and the physico-mechanical properties of the known (prototype) cement are shown in table 2.

As follows from Tables 1 and 2, the cementitious strength according to the invention is not less than the known strength, but has high sulfate resistance. The carbonate-barium tails and slag of zinc production described are introduced during grinding of cement clinker and ground to a fineness of cement (300-320 m2 / kg), which eliminates the need for an additional grinding unit and energy consumption for burning to a specific surface of 500 m / kg as in the known method (prototype).

Claims (1)

The claims The thickener, including Portland cement clinker, barium carbonate tails, characterized in that, in order to increase sulfate resistance and simplify the technology while maintaining strength, it additionally contains zinc slag containing 50-60% glass phase in the following ratio of components, wt. %: Portland cement clinker55-75 Barium carbonate tails15-25 Specified ass of zinc production 10-20 Table 17998596 Table 2 Properties of the known (prototype) in burning