Sealing mixture for waterproofing and concreting tunnel linings

FIELD: construction.

SUBSTANCE: invention can be used namely for ensuring tightness of joints in reinforced concrete tunnel blocks routed in conditions of non-aggressive ground water, as well as for performing waterproofing. Mixture for waterproofing and concreting tunnel linings includes portland cement without any additions with activity of not less than 25.0 MPa in 1 day, expanding sulfoaluminate component- mixture CaO:Al2O3:SO3 at molar ratio (3.1-3.5):(0.9-1.2):(2.2-2.6), fine cellulose fibre with fibres 0.03-1.0 mm long, copolymer of vinyl acetate and vinyl versatate, tartaric acid or its soluble salts and quartz sand with particle size of 0.1-2.5 mm, at the following component ratio, wt %: the above portland cement 45-50, mixture CaO:Al2O3:SO3 2.5-3.5, tartaric acid or its soluble salts 0.010-0.025, copolymer 0.2-0.5, cellulose fibre 0.1-0.2, quartz sand - the rest.

EFFECT: simplifying and reducing the process durability, increasing initial strength of concreting material obtained from mixture, increasing thixotropy of mixture and preventing it from being slipped from ceiling and vertical surfaces, improving its sanitary characteristics.

7 ex, 1 tbl

 

The invention relates to the injection of dry mixtures and can be used, in particular, to provide sealing of joints in concrete blocks, tunnels, laid out in the conditions of aggressive groundwater, as well as for waterproofing.

Known dry sealing material used, in particular, for waterproofing and concreting of the tunnel lining, representing the cement gipsoglinozemistyy expanding HOST-74.

This material contains blast-furnace slags, which are a waste of metallurgical production with uncertain properties, and therefore the physico-chemical properties of cement on HOST-74 is unstable; the strength of the cement insufficient; because of the high content of SO3(up to 17 wt.%) the durability of the material is insufficient; in addition, the cement on HOST-74 allocates sulfide mixing, which is unacceptable when working in a confined space of the tunnel.

Known sealing mixture, which can be used for concreting and waterproofing oil and gas wells and tunnel lining. The mix contains Portland cement clinker, slag, solfataras and aluminum-containing components; aluminum-containing component mixture contains white sludge formed at the stage of deep obestsenivaya alumina the solutions in the production of alumina sintering of high-silicon aluminum-containing ores, in the following ratio, wt.%:

The white slurry of alumina production4,0-8,0
Solfataras component (%of SO3)2,0-5,0
The slag component10,0-15,0
Portland cement clinkerRest

SU1435764.

The disadvantage of this mixture is the low mechanical strength from the material, as well as long term cure.

Known sealing mixture for waterproofing, tunnel lining, which can also be used for concreting; mix contains Portland cement, which extends sulfoaluminate component in the form of gipsoglinozemistyy cement in combination with aluminous cement and fine fibers in the form of asbestos in the ratio of components, wt.%:

Gipsoglinozemistyy cement27-30
Portland27-30
Asbestos9,5-10
Pensamiento 30-36

SU 300436.

This mixture is the closest technical solution with respect to the claimed invention in terms of total essential features and adopted as a prototype.

The disadvantages of the prototype are as follows:

- too short hardening period (the beginning of the setting 4-10 min), which causes the need for mixing small portions of the mixture, which should be used for a very short period of time. Due to the fast setting material is deposited to fill the space in several stages using additional equipment - stamping hammer; above complicates and increases the duration of the technological process;

- aluminous and gipsoglinozemistyy cement included in the composition of the mixture, characterized by the instability of the chemical composition and properties, because they are the product of grinding of alumina slag formed as metallurgical wastes that result causes a low level of strength as compression and adhesion;

- mortar does not have sufficient thixotropy, which causes her slipping from the ceiling and vertical surfaces;

- the presence of asbestos sharply worsens sanitary-higienica the Kie characteristics of the mixture.

The present invention is to simplify and reduce the duration of the technological process in the implementation of waterproofing and concreting of the tunnel lining, increase the initial strength obtained from a mixture of manalicious material, increase the thixotropy of mortar and thereby preventing its slipping from the ceiling and vertical surfaces, as well as the improvement of sanitary and hygienic characteristics.

According to the invention the mixture for waterproofing and concreting of the tunnel lining comprising Portland cement, expanding sulfoaluminate component and fine fiber further comprises a copolymer of vinyl acetate and vinylbenzoate, tartaric acid or its soluble salts and silica sand with a particle size of 0.1 to 2.5 mm, at the same time as expanding sulfoaluminate component, a mixture of Cao: Al2About3: SO3when the molar ratio(3,1-3,5):(0,9-1,2):(2,2-2,6), as the Portland cement used in the Portland cement without additives with activity at least 25,0 MPa after 1 day, as a fine pulp fibers using fiber size fiber of 0.03-1.0 mm, in the following ratio, wt.%:

45-50
the Portland cement without additives
the mixture of Cao:Al2O3:SO3when the molar
the ratio(3,1-3,5):(0,9-1,2):(2,2-2,6)2,5-3,5
tartaric acid or its soluble salts0,010-0,025
the copolymer of vinyl acetate and vinylbenzoate0,2-0,5
cellulose fiber0,1-0,2
quartz sandrest

The applicant has not identified the sources containing information about technical solutions, identical to the present invention, which allows to make a conclusion about its compliance with the criterion of "novelty".

Portland cement is the basis of the mixture; Portland cement without additives (in the specific example - PC 500 UP to according to GOST 10178-85) provides a fast curing, hardening, which do not provide Portland cement with additives (mineral), because the content of the active clinker in them is significantly lower. Furthermore, the activity of Portland cement without additives must be at least 25,0 MPa after 1 day, because otherwise the strength of the hardened material in the early stages insufficient for the implementation of such important works as the waterproofing and the concreting of the tunnel lining; the material may fall out of the resealable seam, which is unacceptable. When the content of Portland cement without additives less than 45 wt.% reduced strength in the initial period, and when the content of this component is more than 50 wt.% increase setting time of the mixture and also decreases the strength of the solution.

The mixture of Cao:A12O3:SO3an expanding component that provides reliable retention of the solution in the sealing cracks and improves the crack resistance. The molar ratio of Cao:Al2About3SO3within these limits(3,1-3,5):(0,9-1,2):(2,2-2,6) provides education phase ettringite by the reaction: Cao·Al2About3+3CaO·SO2·0,5H2O+2CaO·H2O+28.5H2O→CaO·Al2About3·3CaO·3SO3·N2O.

Education phase ettringite in the initial period of hydration of the mixture provides the shortening of the setting time, high compressive strength, the desired amount of expansion. These properties are not sufficiently expressed in the content of Cao:Al2About3:SO3in a mixture of less than 2.5 wt.%, and when the content of this component more than 3.5 wt.% is too much expansion solution, which can lead to deformation or even destruction of the sealed design.

The presence of the claimed mixture of tartaric acid or its soluble salts (tartratami) 0,010-0025 wt.% allows you to provide the required setting time - 10-30 minutes At the content of this component is less than 0,010% by weight of the setting time is less than 10 min, which is too low for the process to work with the mixture, and when the content of it more of 0.025 wt.% setting time more than 30 min, which can lead to slipping of the mortar mixture in the sealed seam.

The use of a copolymer of vinyl acetate with virilisation in the amount of 0.2-0.5 wt.% provides the giving of the injection mortar the plasticity required for free fill joints without additional mechanical seal, increasing the strength of adhesion of the mortar mixtures with a basis; is provided to prevent slipping of mortar with vertical and ceiling surfaces; when the content of this component in the amount of less than 0.2 wt.% not provide the required mobility of the injection mortar and a sufficient amount of coupling with the base; the increase in the content of a copolymer of vinyl acetate with virilisation > 0.5 wt.% extends the setting time of mortar, slows down the kinetics of the curing solution.

Use as a fibrous component cellulose fiber provides ecological purity of the mixture. The feature of the structure of cellulose fibers, which are tubes, hollow inside, in addition provides high thixotropy mortar with whom thou - the increased mobility at the time of application of the load due to the release of free water from the fiber and the subsequent reduction of mobility after removing the load, which prevents slipping of mortar with vertical and ceiling surfaces. When the content of the cellulose fibers is less than 0.1 wt.% these few properties are manifested, and when the amount is more than 0.2 wt.% significantly increases the water requirement of the mix, resulting in the deterioration of its main characteristics. Quartz sand is a placeholder, increases crack resistance, participates in the regulation of the kinetics of phase formation.

Thus, the implementation of the distinguishing features of the claimed invention provides the above important new properties object.

The applicant has not found any sources of information containing data about the impact of an alleged distinguishing signs on achieved as a result of their implementation of the technical result. This, according to the applicant demonstrates compliance with this technical solution, the criterion of "inventive step".

The table shows the properties of the solutions prepared from the stated mixtures with various proportions of the starting components.

The following example shows a solution of a mixture that has the highest property (example 3 in the table).

In a mixture of the spruce was introduced 475 kg of Portland cement without additives PC 500 TO the activity of more than 25,0 MPa, 28 kg of a mixture of Cao:Al2About3:SO3when the molar ratio 3,36:1,02:2,40, 0.2 kg of tartaric acid, 3 kg of a copolymer of vinyl acetate and vinylbenzoate, 1 kg of cellulose fibres; the components were mixed for 3 minutes. Then the mixer was introduced filler is quartz sand (0.1 to 2.5 mm), the mixture was additionally mixed for 3 minutes. The zatvoreniem dry injecting a mixture of water was carried out at the place of use. In the mixer poured the required amount of water - (a/T=0,15) 150 l per 1 ton of the mixture, then covered the dry mix mortar mixture was mixed for 2 minutes, and was then ready for use.

Solution examples 1, 2, 4, 5, 6, 7 and according to the prototype prepared similarly.

Thanks to the possibility of regulating setting time and increase it up to 10-30 minutes is the possibility of laying mortar mixture in the sealed seam in one step without the use of additional equipment - stamping hammer that allows you to simplify and reduce the duration of the technological process of sealing seam; increased initial strength (1 day) obtained from a mixture of solid manalicious material; increasing the thixotropy of mortar and prevents the slide from the ceiling and vertical surfaces.

The components of the dry injecting the mixture produced by the industry, widely available. Technology of preparation and application of dry injection mixture is implemented using standard equipment. This determines whether the claimed invention, the criterion of "industrial applicability".

The mixture for waterproofing and concreting of the tunnel lining comprising Portland cement, expanding sulfoaluminate component and fine fiber, characterized in that it further contains a copolymer of vinyl acetate and vinylbenzoate, tartaric acid or its soluble salts and silica sand with a particle size of 0.1 to 2.5 mm, at the same time as expanding sulfoaluminate component, a mixture of Cao:Al2O3:SO3when the molar ratio(3,1-3,5):(0,9-1,2):(2,2-2,6), as the Portland cement used in the Portland cement without additives with activity at least 25,0 MPa after 1 day, as a fine pulp fibers using fiber size fiber of 0.03-1.0 mm in the following ratio, wt.%:

the Portland cement without additives45-50
the mixture of Cao:Al2O3:SO3when the molar
the ratio(3,1-3,5):(0,9-12):(2,2-2,6) 2,5-3,5
tartaric acid or its soluble salts0,010-0,025
the copolymer of vinyl acetate and vinylbenzoate0,2-0,5
cellulose fiber0,1-0,2
quartz sandrest



 

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