RU2389699C1 - Binder - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to production of construction materials and can be used in making mortar. The binder contains portland cement and pearlite, mechanically activated with superplasticiser S-3 through joint wet grinding with ratio of solid substance to water equal to 1:(0.3-1) until attaining specific surface area not less than 20000 cm²/g and drying the obtained suspension, with ratio of superplasticiser S-3 to pearlite equal to (0.01-0.1):1.

EFFECT: increased strength and density of hardened cement paste, reduced water permeability and reduced water to cement ratio.

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Description

The invention relates to the production of building materials and can be used to obtain composite binders.

A dry cement mixture is known, including Portland cement, C-3 superplasticizer, a mineral additive in the form of volcanic rock, or tuff, or pumice, or perlite RU No. 2148041, MPK SZHV 7/13.

A disadvantage of the known dry cement mixture is a complex multicomponent composition, requiring additional technological operations in the process of its preparation.

The tasks to which the proposed solution is directed is to reduce the number of components of a knitting natural or man-made origin with a high level of quality indicators of concrete with its use.

The technical result is achieved in that the binder, including Portland cement and an additive containing perlite and C-3 superplasticizer, contains perlite mechanically activated by co-wet milling with C-3 superplasticizer to a specific surface of 20,000 cm ² / g and drying the resulting suspension, with the ratio of solid to water 1: (0.3-1) and the ratio of superplasticizer C-3 and perlite (0.01-0.1): 1.

The mechanical activation of a suspension of knitting perlite with C-3 superplasticizer in a vibrocentrifugal mill (centrifugal acceleration of bodies up to 100 g) contributes to an increase in the hydraulic activity of the mineral additive in comparison with its traditional state.

Example

Perlite with superplasticizer C-3 in a ratio of 0.01: 1 in the first stage is subjected to wet polishing with water at a ratio of solid to water of 1: 0.5 in centrifugal planetary or vibrocentrifugal mills for the purpose of mechanomechanical activation and ultradispersion (centrifugal acceleration of grinding media - up to 100 g). In a second step, the resulting highly concentrated suspension is dried in a spray dryer.

It turns out ultrafine, with a specific surface area of at least 20,000 cm ² / g, an organomineral additive, which is mixed with Portland cement for 10 minutes in an amount of 3 wt.% Of Portland cement. The resulting binder is used to obtain mortars and concrete.

The proposed binder has high quality indicators and allows you to get the following results:

- increase in the density and strength of cement stone (including in the early stages) by 30-40%; compressive strength at the age of 28 days is 95 MPa (according to GOST 10180-90);

- reduction of water resistance of cement stone (1.2 MPa according to GOST 12730.5-84);

- decrease in water-cement ratio.

Claims (1)

A binder containing Portland cement, perlite-containing additive and C-3 superplasticizer, characterized in that it contains perlite mechanically activated with C-3 superplasticizer by co-wet grinding with a ratio of solid to water of 1: (0.3-1) to specific a surface of at least 20,000 cm ² / g and drying the resulting suspension, with a ratio of superplasticizer C-3 and perlite (0.01-0.1): 1.