SU1257165A1 - Plugging composition - Google Patents

Description

The invention relates to cement slurries designed to fill voids in saline rocks and waterproofing mine workings, to protect rock-salt deposits from destruction, to strengthen the pillars of mine workings, water suppression, preservation of buildings and structures, the base of which is easily soluble salt rocks, and can be used in geology, mining, hydraulic engineering, and construction.

The purpose of the invention is to increase the yield of stone, its adhesion to salt rock and compressive strength.

The physicomechanical parameters of the well there: x solutions are given in the table.

Liquid glass is an inorganic polymer that accelerates the hydration of cement, promotes the thickening of cement, but reduces its strength. It is known that in the composition with clay solutions, liquid glass contributes to liquefaction and increase in fluidity. However, as shown by the experiments, the use of liquid glass in the combination proposed by us with cement, clay, sodium chloride and water led to an improvement in the strength properties of the composition and an increase in the yield of stones (see table).

The choice of the boundary values of the components of the mixture is made according to three main criteria: the yield of stone, yield, as measured by spreading over the AzNII cone, and compressive strength.

The stone output from the cement slurry should be 99-100% to ensure the karst cavities and cracks are completely filled. A decrease in stone output (an increase in water separation) reduces the quality of waterproofing due to the loose contact of the solution with salt rock.

In the practice of pumping clay and cement mixtures with pumps, the lower yield strength is considered to be 12 cm. Reducing the spreading makes it difficult to inject the mixture.

The introduction of liquid glass above the proposed limit reduces the stone output (see table, composition No. 5), reducing its content reduces the compressive strength (composition No. 14).

With the introduction of cement less than 5.7% decreases the rate of hardening and compressive strength (composition No. 1), its content of more than 8.1% leads to an over-consumption of the glue without improving the strength properties (composition No. 7).

The content of sodium chloride and water in the range of 11.3-11.5 and 24.4 g of 24.6 wt.%, Respectively, provides a saturated salt solution. A decrease in the amount of sodium chloride will cause the salt rock to dissolve by contact with the cement slurry and worsen its adhesion to the salt mass. An increase in the content of sodium chloride is impractical, since at supersaturation excess salt will precipitate. The content in the solution of water within the specified limits provides him with sufficient fluidity, stone output and strength (compositions No. 2-6, 10-13 16, 21,

22) ..

When the clay content is below 54.9%, water separation increases, i.e. stone output decreases (composition no. 8), with a clay content of more than 57.3%, the solution becomes insufficiently fluid (composition no. 9).

The preparation of the proposed solution is carried out by mixing dry clay with a previously prepared saturated sodium chloride solution followed by the introduction of

into this mixture of dry cement and then liquid glass.

Dp of preparation of the solution can be used Portland cement not lower mark 400 and high modulus

(module 2.8-3.2) liquid glass with a density of 1.40-1.45 g / cm and local hydromica-kaolin clay with a plasticity number of 20-23. I.

To prepare 1 liter of the mixture, take 500 cm of a saturated solution.

sodium chloride (density 1.20 g / cm / then 1000 g of dry clay are added and mixed for 10 minutes, after which 100 g of cement are poured, and after 5 minutes of mixing, 25 cm of 1.45 density glass with a silicate module are added 3.1 The whole mixture is stirred for 5 minutes, the resulting solution with a ratio of components in wt.%: Cement 5.7, clay 57.2; water 24.5; sodium chloride 11.5 and liquid glass 1, I (composition No. 10) xa is characterized by a spread of 13.5 cm, vy312

House of stone 99%, at 7 days of age has a strength of adhesion to salt rock 1.3 kgf / cm and strength under uniaxial compression 3.4 kgf / cm.

Determination of the properties of the cement slurry was carried out according to generally accepted methods: flowability — by the spreading out with the AzNII cone, stone output — by the value of the precipitated solid phase of the solution poured into the measuring cylinder. D; 1 for determining the strength characteristics of the solution is poured into molds that are placed in the best grade sodium chloride solution. Samples harden at a temperature of 15 ± 1 ° C.

50

1654

Compressive strength is determined in samples-cubes with an edge of 2 cm, the adhesion force of the solution with salt rock - on samples of cylinders with a height and diameter of 3 cm, which are placed in a freshly prepared cement slurry.,

Similar characteristics are also determined for a known prototype solution (composition No. 23) prepared on the basis of hydromica-kaolinite clay with a plasticity number of 22 and portland cement of brand 400 and using soda ash as a structure 5.

Note. - limit contents of ingredients (in - top

and lower);

c is the average content of ingredients; beyond the content of ingredients.

Editor N. Slobod Nick

Compiled by L. Bestuzhev

Tehred MoHodan1-gch Proofreader A.T.

Order 4888/24 Circulation .548 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, ZHZZ, Raushsk kab, d.4 / 5

Production and printing company, Uzhgorod, Projecto st., 4

Table continuation

Claims (1)

TUMPING SOLUTION for waterproofing mines in salt formations, containing Portland cement, clay, water, sodium chloride and an additive, characterized in that, in order to increase the yield of stone> adhesion to salt formations and compressive strength, it contains as additives liquid glass, and as clay - hydromicaceous kaolinite with a plasticity number of 20-23, with the following ratio of components, wt.%: Portland cement 5.7-8.1 Hydrosica thai kaolinite with the number of pl 20- about 23 54.9-57.3 S Nat Chloride ri 11.3-11.5 V / Liquid glass 0.9-1.3 FROM Water Rest 1257165 2