SU1527204A1 - Binder composition - Google Patents

Abstract

This invention relates to mineral compounds in liquid glass slides and can be used in the manufacture of building parts and structures. The purpose of the invention is to lengthen the setting time and increase acid resistance. In general includes, wt.%: High-modulus water glass with M _with = 2.8-3.2 4-8

potassium bifluoride 1-2

nepheline sludge else. The beginning of the setting in the waiting 35-58 min, the end of 48-72 min, acid resistance 0.82-0.98. 1 tab.

Description

This invention relates to mineral compounds in liquid glass slides and can be used in the manufacture of building parts and structures.

The purpose of the invention is to lengthen the setting time and increase acid resistance.

In the manufacture of a nepheline slurry, the slurry is pre-dried and ground to a specific surface of 320 m / kg. Then the slurry is mixed with quartz sand in a ratio of 1: 3 and shuttered with a solution of high modulus water glass with potassium bifluoride, taken in a given ratio.

Samples are formed from the resulting mixture by vibrating.

After one day, the forms were dismantled, some of the samples were tested for strength, the rest were placed in water and tested at certain times.

The introduction of potassium bifluoride into the system significantly enhances the pH of the medium, which creates conditions for the long-lasting hydration process with the formation of CaF and potassium calcium hydrofluorosilicate KCa4. the initial period of hydration, this process lasts a long time and causes the creation of an ordered defect-free structure of the product, providing it with a high final strength.

The use of a high modulus liquid glass solution in combination with potassium bifluoride leads to the formation of a large amount of silica gel, which gradually crystallizes and strengthens the structural bonds of the hydration products and, in addition, significantly increases the resistance of the product.

In the manufacture of a binder, nepheline sludge of the following chemical composition was used, wt.%, 0 AljO, 5.1; , 3.9; CaO 58.0; MgO 1,2; 2.5; ppt - the rest.

The compositions of the substance and the results of the test properties are shown in the table.

with s

(L

The determination of the acid concreteness of the samples was carried out on the sample beams cm after their steaming. Part of them were placed in one percent solutions of acetic or hydrochloric acid, the second part — control samples — were placed in tap water. In these media, the samples were kept for 1 month, after which they made a strength test. The ratio of the strength of the samples in solutions of acids to the strength of the samples in water was the coefficient of resistance.

In parallel, a test was carried out on a nepheline sludge and liquid glass sustenance according to a known method.

From the test results, it follows that the proposed binder is characterized by a long-term curing, high indicators of ultimate strength.

extended setting time and increased acid resistance.

Claims (1)

Invention Formula Consisting of nepheline sludge, water glass and mineral additive, characterized in that, in order to lengthen the setting time and increase acid resistance, it contains high modulus water glass with Mjj 2.8-3.2, and as a mineral additive - potassium bifluoride in the following ratio, wt.%: High-modulus water glass with HC 2.5-3.2 (calculated on the dry matter) 4-8 Potassium bifluoride 1-2 Nepheline sludge Else The compositions by a known method. Liquid glass in terms of.