CS257131B1 - Modified self-hardening suspension - Google Patents

Abstract

The purpose of the solution is to modify the composition of the self-hardening suspensions used so far in order to improve technological and technical properties. The self-hardening suspension of the composition according to the solution has an extended setting time of up to 120 h, the hardened mass has increased strength under simple pressure even in an environment with a relative humidity of 00 to 100% and a reduced filtration coefficient by approximately 2 orders of magnitude. A higher effect is achieved by adding a bitumen suspension miscible with water to the self-hardening suspension.

Description

257131

BACKGROUND OF THE INVENTION The present invention relates to a modified self-hardening suspension having a longer cure time of 72 hours, with improved strength and deformation properties and reduced permeability therefrom. The modified self-hardening suspension can be used in the construction industry, especially for the production of thin-walled, underground sealing walls.

Self-hardening suspensions have so far been produced by mechanically activating clay, hydraulic masses, stabilizing and plasticizing-retarding additives in water. Plasticizing the mixture and retarding the initial solidification to 72 hours is achieved by addition of polyphenolic or lignosulfonate-based reagents, optionally in combination. The mixture has cured after curing! filtration at limits k = 5.109 - 1 .. 10 "11 m. s “1.

A disadvantage of the cured mass prepared from the self-curing suspensions produced so far is the decrease in strength after prolonged, intermittent storage in an environment with a relative humidity of 90 to 100%.

By improving the properties of the self-curing suspension and the hardening of the composition according to the invention, the addition of the resin suspension in the amount of 5 to 25p. % by volume, with a dry matter content of 30 to 80% by weight. The bitumen suspension may contain a latex in an amount of up to 15% by weight of the suspension. The bitumen suspension must be water-miscible.

The self-curing suspension of the present invention eliminates the drawbacks of the self-curing suspensions so far produced by extending the solidification start to 72-120 hours and reducing the filtration coefficient of mass to hardening to k = 1.10 "10-1.10" 13 ms-1 depending on množstvahmot.

The pressure-free strength is 5 to 25% higher compared to self-curing suspensions made with the same amounts of hydraulic bits without bitumen. A further preferred cured self-curing suspension of the composition according to the invention is the long-term increase in strength with the time of the samples stored in the environment with varying 90-100 pounds. relative humidity.

The higher effect is achieved according to the invention by adding a water-soluble bitumen suspension to the self-curing suspension. Examples of the composition of the modified self-curing suspension per m < 3 > according to the invention with limiting amounts of bitumen suspension: Example II. Example I. Water 849 1 570.0 1 Activated bentonite 70 kg 52.0 kg Plastic-retardant additive 3.2 kg 5.4 kg Hydraulic material 225 kg 430.0 kg Bitumen suspension containing 4% by weight of styrene-butadiene-new latex the suspension comprises 60 wt. dry matter 50 1 250 1 Examples of self-curing suspension pressure-free composition and filtration coefficient after treatment without bitumen suspension and with bitumen curing: new suspension compared to strength in Example III. Example IV. water 620.0 1 670.0 1 activated bentonite 52.7 kg 52.7 1 hydraulic mass 430.0 kg 430.0 kg cortane 5.4 kg 5.4 kg bitumen suspension with 4 wt. of styrene-butadiene latex, the suspension contains 60 wt. dry matter 0.01 150.01

Claims (2)

I 5 6 Cured mass of self-curing composition suspensions according to Examples III. and IV. has the following characteristics: 257131 suspension III. suspension IV. - pressure-free strength after 3 months of hardening 2.40 MPa - compressive strength after 12 months of hardening 3.45 MPa 2.75 MPa4.10 MPa Composition suspension according to Example III. in an environment with 90% relative humidity, the drop in simple pressure strength was 12 months to 1.70 MPa. Steady filtration coefficient of cured suspension of composition III. is k - 1.2.10 ~ 9m. s' 1 and formulation suspension IV. is k = 3.3 .. 10-12 m. s1. The invention can be used, in particular, for thin-walled underground sealing walls produced without soil removal and without pressure injection, by progressive punching and extraction of hollow casings with simultaneous filling with a modified self-curing suspension. In the production of thin-walled subsoil walls, the specific properties of the modified self-curing suspension and the mass after curing are applied. P R E D Μ E T Modified self-curing suspension comprising water, clay, hydraulic masses, stabilizing and plasticizing-retarding additives, characterized in that it comprises a bitumen suspension in an amount of 5 to 25% by weight of the fine weight with a dry matter content of 30 to 80% by weight. . 2. A modified self-hardening suspension according to claim 1, wherein the bitumen suspension contains up to 15% by weight of styrene-butadiene latex, while mixing with water.