Alkali-activated tunnel lining repair material based on alkali-salt synergy and preparation method thereof

Abstract

The application belongs to the field of repairing mortar, and provides an alkali-activated tunnel lining repairing material based on alkali-salt synergy and a preparation method thereof, which is composed of the following components in parts by mass: 80-90 parts of slag, 5-12 parts of alkali-salt synergistic activator, 5-8 parts of expanding agent, 10-20 parts of ultra-fine admixture, 2-5 parts of setting time regulator, 8-12 parts of organic polymer, and 200-360 parts of sand. The tunnel lining repairing material has the advantages of high mechanical strength, low volume shrinkage, high bonding strength, low preparation cost, simple preparation method, etc., and can realize efficient repair of tunnel lining diseases.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of repair mortar, and particularly relates to an alkali-activated tunnel lining repair material based on alkali-salt synergy and a preparation method thereof. BACKGROUND

[0002] The information disclosed in this Background section is for the purpose of increasing the understanding of the background of the application without admitting that such information forms any part of prior art.

[0003] Tunnel engineering is a crucial link in the construction of traffic facilities. Due to the complex terrain in many areas and the immaturity of early tunnel construction technology, traffic tunnels often have diseases such as lining cracking, surface damage and water leakage during the operation period. Lining diseases will lead to the decline of the stability and bearing capacity of the lining structure, which poses a great threat to the normal operation of the tunnel. During the process of repairing the tunnel structure, methods such as local chiseling and reinforcing, chiseling and embedding, and direct daubing can be used, and mortar materials are used for repair. Therefore, the excellent performance of the repair material is an important guarantee for the repair effect.

[0004] At present, tunnel lining repair materials can be divided into inorganic, organic and composite materials according to their composition. The inorganic repair material is mainly cement-based material, which has the disadvantages of large shrinkage, low bonding strength, poor material impermeability and high material production energy consumption. The organic material has poor compatibility with the concrete base material and is high in cost, which is not conducive to large-scale promotion. The composite repair material combines the advantages of organic and inorganic materials, but at present, the composite repair material is mainly based on polymer modified cement, which is high in construction cost.

[0005] Alkali-activated cementitious materials have potential application prospects in the field of tunnel lining repair due to their high mechanical strength and good durability. However, alkali-activated slag cement has poor volume stability, which makes it difficult to meet the requirements of repair materials. In addition, tunnel lining diseases are complex and diverse, and existing repair materials are difficult to meet the performance requirements of tunnel lining. Therefore, it is urgent to develop new repair materials with high strength, low shrinkage, high adhesion and low cost.

[0006] Some studies have used CaSO4-Na2SiO3 (calcium sulfate-sodium silicate), Na2CO3-Na2SiO3 (sodium carbonate-sodium silicate) and Na2SO4-Na2SiO3 (sodium sulfate-sodium silicate) three kinds of composite activators to improve the volume stability of slag cementitious materials, but the compressive strength and volume stability of the repair materials prepared by the above methods still need to be improved. SUMMARY

[0007] To solve the above problems, the application provides an alkali-activated tunnel lining repair material based on alkali-salt synergy and a preparation method thereof. The alkali-salt composite activation, water-glue-sand regulation, sand grading design, and ultra-fine admixture are used to improve the volume stability of the alkali-activated slag repair mortar. In addition, the organic polymer is used to improve the bonding strength of the alkali-activated slag repair mortar. The alkali-activated tunnel lining repair material has high mechanical strength, small volume shrinkage, high bonding strength, good water resistance, and low cost.

[0008] To achieve the above-mentioned purposes, the application adopts the following technical solutions.

[0009] In a first aspect, the application provides an alkali-activated tunnel lining repair material based on alkali-salt synergy, which is composed of the following raw materials by weight: 80-90 parts of slag, 5-12 parts of alkali-salt synergistic activator, 5-8 parts of expanding agent, 10-20 parts of ultra-fine admixture, 2-5 parts of setting time regulator, 8-12 parts of organic polymer, and 200-360 parts of sand.

[0010] The alkali-salt synergistic activator is composed of the following raw materials by weight: 10-15 parts of sodium silicate, 20-30 parts of sodium sulfate, 5-10 parts of sodium carbonate, 12-20 parts of calcium sulfate, 10-20 parts of sodium aluminate, 1-8 parts of aluminum sulfate, and 2-5 parts of calcium chloride.

[0011] The organic polymer is composed of polyvinyl alcohol and calcium polyacrylate, and the ratio of the two is 1:1-3:1.

[0012] The application researches and finds that, compared with a single alkali-salt (CaSO4-Na2SiO3, Na2CO3-Na2SiO3, Na2SO4-Na2SiO3) complex, the synergy of multiple salt components and alkali components can better improve the compressive strength and volume stability of the repair material. The research finds that there is a synergistic effect between sulfates and chlorides, which can better improve the activation effect and thus improve the mechanical strength and volume stability of the repair material. In addition, the addition of sodium aluminate and aluminum sulfate can provide aluminum components, thereby increasing the amount of hydration products (hydrated calcium sulfoaluminate, etc.), and improving the compressive strength and volume stability.

[0013] It should be further pointed out that, compared with other aluminum salts, the aluminate ion in sodium aluminate can participate in the hydration reaction of the repair material, increase the amount of hydration products, and thus improve the mechanical strength of the repair material. In addition, the sodium ion in sodium aluminate can also activate the raw materials of the repair material, but its activation effect is weaker than that of sodium silicate, which can prevent the reaction from being too fast, and thus obtain better volume stability.

[0014] The aluminum ion in aluminum sulfate can participate in hydration reaction, increase the amount of hydration product, and further improve the mechanical strength, and increase the content of sulfate radical, the sulfate ion has excitation effect on the raw materials of the repairing material, but the excitation effect is weaker than that of sodium silicate, and the sulfate ion can also prevent the reaction from being too fast, and further obtain better volume stability.

[0015] The application selects polyvinyl alcohol and polyacrylic acid calcium to regulate the bonding strength of the alkali-activated tunnel lining repairing material through early compatibility research, and improves the flexural strength and bonding strength of the repairing material through in-situ re-polymerization reaction of the two in the alkali-activated tunnel lining repairing material.

[0016] Preferably, the slag is slag after drying and grinding, and the specific surface area is 400-800 m 2 / kg, and the moisture content is <1%. More preferably, the slag is a by-product of ironmaking in the steel industry.

[0017] The expansion agent is a kind of chemical additive added in cement, which expands when the cement is hardened, and plays a role of compensating shrinkage and filling the gap between the cement. In order to further reduce the volume shrinkage rate of the repairing material, the composition and amount of the expansion agent are researched, and preferably, the expansion agent is composed of the following raw materials in parts by weight: magnesium oxide 10-18 parts, calcium oxide 15-25 parts, and aluminum powder 4-9 parts. Magnesium oxide and calcium oxide can generate calcium hydroxide and magnesium hydroxide with expansion property when they come into contact with water, and both of them can participate in the hydration reaction process of the alkali-activated slag, and can reduce the volume shrinkage rate of the stone body. In addition, the incorporation of aluminum powder can not only have expansion properties, but also participate in the hydration reaction of the alkali-activated slag, and form a synergistic effect with the hydration product, thereby further reducing the shrinkage rate of the stone body.

[0018] In order to better improve the mechanical strength, durability and volume stability of the repairing material, the composition and amount of the ultra-fine admixture are also researched, and preferably, the ultra-fine admixture is composed of the following raw materials in parts by weight: ultra-fine calcium carbonate 10-20 parts, ultra-fine quartz 15-30 parts, ultra-fine fly ash 8-12 parts, ultra-fine red mud 5-10 parts, and ultra-fine cement 10-20 parts. The ultra-fine admixture has a micro-aggregate filling effect, which can improve the density of the stone body, and further improve the mechanical strength, durability and volume stability of the repairing material. In addition, the calcareous component and siliceous-aluminous component in the ultra-fine admixture can participate in the hydration reaction of the alkali-activated slag, and can further generate more hydration products, thereby improving the volume stability and mechanical strength. The ultra-fine cement in the ultra-fine admixture has alkalinity, and can have a certain alkali-activation effect.

[0019] Preferably, the specific surface area of each component of the ultra-fine admixture is >1200 m 2 / kg.

[0020] In order to better regulate the setting time of the repairing material, the composition and the amount of the setting time regulator are researched in the application, preferably, the setting time regulator is composed of the following raw materials in parts by weight: sodium carboxymethylcellulose 5-10 parts, calcium tartrate 2-6 parts, sodium pyrophosphate 8-15 parts, and disodium ethylenediaminetetraacetate 10-15 parts; the dynamic regulation of the setting time of the alkali-activated tunnel lining repairing material can be realized, in addition, the calcium component and the sodium component in the setting time regulator can participate in the hydration process of the alkali-activated slag, thereby delaying the setting time while ensuring that the mechanical strength of the repairing mortar does not decrease.

[0021] Preferably, the fineness modulus of the sand is 2.0-3.0.

[0022] In the second aspect of the application, a preparation method of the alkali-salt synergistic alkali-activated tunnel lining repairing material is provided, comprising:

[0023] The slag is dried to a water content <1%, and then ground to a specific surface area of 400-800 m 2 / kg;

[0024] The ground slag is mixed with the alkali-salt synergistic activator, the expansive agent, the ultra-fine admixture, the setting time regulator and the organic polymer to obtain the alkali-activated slag cementitious material.

[0025] The alkali-activated slag cementitious material is mixed with the sand to obtain the alkali-salt synergistic alkali-activated tunnel lining repairing material.

[0026] Preferably, the mixing mode is mechanical stirring.

[0027] Advantages of the application

[0028] (1) The alkali-salt synergistic activation concept is proposed in the application, and the alkali-salt synergistic activator is prepared from sodium silicate, sodium sulfate, sodium carbonate, calcium sulfate, sodium aluminate, aluminum sulfate and calcium chloride. Through the synergistic effect of various components, the mechanical strength of the alkali-activated slag can be improved, and the volume shrinkage rate of the alkali-activated slag can be significantly reduced, and the volume stability of the repairing material can be improved.

[0029] (2) The expansive agent is composed of magnesium oxide, calcium oxide and aluminum powder in the application, and the magnesium oxide and the calcium oxide can generate the expansive calcium hydroxide and magnesium hydroxide when meeting water, and the two can participate in the hydration reaction process of the alkali-activated slag, thereby reducing the volume shrinkage rate of the stone body. In addition, the incorporation of the aluminum powder can not only have the expansion property, but also participate in the hydration reaction of the alkali-activated slag, and form the synergistic effect with the hydration products, thereby further reducing the shrinkage rate of the stone body.

[0030] (3) The superfine calcium carbonate, superfine quartz, superfine fly ash, superfine red mud and superfine cement are used to form the superfine admixture, the superfine admixture has the micro aggregate filling effect, the compactness of the stone body can be improved, and then the mechanical strength, durability and volume stability of the repairing material are improved; in addition, the calcareous component and the siliceous and aluminous component in the superfine admixture can participate in the hydration reaction of the alkali-activated slag, and more hydration products can be further generated, so that the volume stability and the mechanical strength are improved, and the superfine cement in the superfine admixture has alkalinity, and can play a certain alkali-activation effect.

[0031] (4) The sodium carboxymethyl cellulose, calcium tartrate, sodium pyrophosphate and disodium ethylenediaminetetraacetate are used to form the setting time regulator, the setting time of the alkali-activated tunnel lining repairing material can be dynamically regulated, in addition, the calcareous component and the sodium component in the setting time regulator can participate in the hydration process of the alkali-activated slag, so that the setting time is delayed, and the mechanical strength of the repairing mortar is not reduced.

[0032] (5) The polyvinyl alcohol and calcium polyacrylate are used to form the organic polymer component. Through the early compatibility research, the polyvinyl alcohol and calcium polyacrylate are selected to regulate the bonding strength of the alkali-activated tunnel lining repairing material, and through the in-situ re-polymerization reaction of the two in the alkali-activated tunnel lining repairing material, the flexural strength and the bonding strength of the repairing material are improved.

[0033] (6) The fineness modulus of the traditional standard sand is adjusted, the closest packing of the alkali-activated tunnel lining repairing material is realized, the porosity of the mortar is reduced to the maximum extent, and the mechanical strength and the volume stability of the alkali-activated tunnel lining repairing material are synergistically improved. BRIEF DESCRIPTION OF DRAWINGS

[0034] The drawings accompanying the specification of this application form a part of the application and serve to further illustrate the application, the exemplary embodiments of which are described herein and explained with reference thereto.

[0035] Figure 1 It is the microstructure diagram of example 8; A is a scanning electron microscope diagram, B is an energy spectrum diagram, and numbers 1, 2, 3, 4 and 5 in A correspond to pt-1, pt-2, pt-3, pt-4 and pt-5 in B respectively.

[0036] Figure 2 It is the microstructure diagram of comparative example 1; A is a scanning electron microscope diagram, B is an energy spectrum diagram, and numbers 1, 2, 3, 4 and 5 in A correspond to pt-1, pt-2, pt-3, pt-4 and pt-5 in B respectively. DETAILED DESCRIPTION

[0037] It should be noted that the following detailed description is exemplary in nature and is intended to provide further description of the application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The materials and reagents used in the present application can be purchased through conventional routes, and are used according to conventional methods in the art, unless otherwise specified. Similarly, the test methods used in the present application are also performed according to conventional methods in the art, or the general methods or standards in the industry, unless otherwise specified. In addition, any method and material similar or equivalent to those described can be applied to the methods of the present application. The preferred methods and materials described herein are only exemplary.

[0039] In order to improve the compressive strength and volume stability of the repair material, the present application provides an alkali-activated tunnel lining repair material based on alkali-salt synergy, which is composed of the following raw materials by weight: 80-90 parts of slag, 5-12 parts of alkali-salt synergistic activator, 5-8 parts of expansive agent, 10-20 parts of ultra-fine admixture, 2-5 parts of setting time regulator, 8-12 parts of organic polymer, and 200-360 parts of sand.

[0040] The alkali-salt synergistic activator is composed of the following raw materials by weight: 10-15 parts of sodium silicate, 20-30 parts of sodium sulfate, 5-10 parts of sodium carbonate, 12-20 parts of calcium sulfate, 10-20 parts of sodium aluminate, 1-8 parts of aluminum sulfate, and 2-5 parts of calcium chloride.

[0041] Preferably, the slag is a slag after drying and grinding, with a specific surface area of 400-800 m 2 / kg and a water content of <1%. More preferably, the slag is a byproduct of ironmaking in the steel industry.

[0042] The expansive agent is a chemical additive added to cement, which expands in volume when the cement hardens, compensating for shrinkage and fully filling the gaps between the cement. In order to further reduce the volume shrinkage rate of the repair material, the composition and amount of the expansive agent are studied in the present application. Preferably, the expansive agent is composed of the following raw materials by weight: 10-18 parts of magnesium oxide, 15-25 parts of calcium oxide, and 4-9 parts of aluminum powder. Magnesium oxide and calcium oxide can generate calcium hydroxide and magnesium hydroxide when they come into contact with water, which can participate in the hydration reaction of alkali-activated slag, thereby reducing the volume shrinkage rate of the stone body. In addition, the addition of aluminum powder not only has the property of expansion, but also can participate in the hydration reaction of alkali-activated slag and form a synergistic effect with the hydration products, thereby further reducing the shrinkage rate of the stone body.

[0043] In order to improve the mechanical strength, durability and volume stability of the repair material, the composition and amount of the superfine admixture are also studied, preferably, the superfine admixture is composed of the following raw materials in parts by weight: 10-20 parts of superfine calcium carbonate, 15-30 parts of superfine quartz, 8-12 parts of superfine fly ash, 5-10 parts of superfine red mud, 10-20 parts of superfine cement; the superfine admixture has a micro-aggregate filling effect, which can improve the compactness of the stone body, and further improve the mechanical strength, durability and volume stability of the repair material; in addition, the calcareous component and siliceous component in the superfine admixture can participate in the hydration reaction of alkali-activated slag, and more hydration products can be further generated to improve the volume stability and mechanical strength, and the superfine cement in the superfine admixture has alkalinity, which can play a certain alkali-activation effect.

[0044] Preferably, the specific surface area of each component of the superfine admixture is > 1200 m 2 / kg.

[0045] In order to better control the setting time of the repair material, the composition and amount of the setting time regulator are studied, preferably, the setting time regulator is composed of the following raw materials in parts by weight: 5-10 parts of sodium carboxymethyl cellulose, 2-6 parts of calcium tartrate, 8-15 parts of sodium pyrophosphate, 10-15 parts of disodium ethylenediaminetetraacetate; the setting time of the alkali-activated slag repair mortar can be dynamically regulated, in addition, the calcareous component and sodium component in the setting time regulator can participate in the hydration process of the alkali-activated slag, thereby delaying the setting time while ensuring that the mechanical strength of the repair mortar does not decrease.

[0046] In order to better improve the flexural strength and bonding strength of the repair material, the combination and amount of the organic polymer are studied, preferably, the organic polymer is composed of polyvinyl alcohol and calcium polyacrylate, and the ratio of the two is 1:1-3:1. Through the preliminary compatibility study, polyvinyl alcohol and calcium polyacrylate are selected for the bonding strength regulation of the alkali-activated slag mortar repair material, and through the original polymerization reaction of the two in the alkali-activated slag repair material, the flexural strength and bonding strength of the repair material are improved.

[0047] Preferably, the fineness modulus of the sand is 2.0-3.0.

[0048] The application also provides a preparation method of the alkali-salt synergistic alkali-activated tunnel lining repair material.

[0049] The slag is dried to a water content <1%, and then ground to a specific surface area of 400-800 m 2 / kg;

[0050] The ground slag is mixed with an alkali-salt synergistic activator, an expansive agent, a superfine admixture, a setting time regulator and an organic polymer to obtain the alkali-activated slag cementitious material.

[0051] The alkali-activated slag cementitious material is mixed with sand to obtain the alkali-activated tunnel lining repair material based on alkali-salt synergy.

[0052] Preferably, the mixing is performed by mechanical stirring.

[0053] The application will be further described in detail below with reference to specific examples, which are intended to explain but not limit the application.

[0054] In the examples and comparative examples of the application, the proportions of the raw materials are all by weight.

[0055] Example 1

[0056] 1. Sodium silicate 10 parts, sodium sulfate 20 parts, sodium carbonate 5 parts, calcium sulfate 12 parts, sodium aluminate 10 parts, aluminum sulfate 1 part and calcium chloride 2 parts are mixed uniformly to prepare an alkali-salt synergistic activator for standby.

[0057] 2. Magnesium oxide 10 parts, calcium oxide 15 parts and aluminum powder 4 parts are mixed thoroughly to prepare an expansive agent for standby.

[0058] 3. Superfine calcium carbonate 10 parts, superfine quartz 15 parts, superfine fly ash 8 parts, superfine red mud 5 parts and superfine cement 10 parts are mixed thoroughly to prepare a superfine admixture for standby.

[0059] 4. Sodium carboxymethyl cellulose 5 parts, calcium tartrate 2 parts, sodium pyrophosphate 8 parts and disodium ethylenediaminetetraacetate 10 parts are mixed thoroughly to prepare a setting time regulator for standby.

[0060] 5. Polyvinyl alcohol and calcium polyacrylate are prepared in a 1:1 ratio to prepare an organic polymer for standby.

[0061] 6. Slag 80 parts, alkali-salt synergistic activator 5 parts, expansive agent 5 parts, superfine admixture 10 parts, setting time regulator 2 parts and organic polymer 8 parts are mixed thoroughly to prepare an alkali-activated slag-based cementitious material for standby.

[0062] 7. The alkali-activated slag-based cementitious material is mixed with 200 parts of sand with a fineness modulus of 2.0 to obtain the alkali-activated tunnel lining repair material based on alkali-salt synergy.

[0063] Example 2

[0064] 1. Sodium silicate 15 parts, sodium sulfate 30 parts, sodium carbonate 10 parts, calcium sulfate 20 parts, sodium aluminate 20 parts, aluminum sulfate 8 parts and calcium chloride 5 parts are mixed uniformly to prepare an alkali-salt synergistic activator for standby.

[0065] 2. Mix magnesium oxide 18 parts, calcium oxide 25 parts, aluminum powder 9 parts thoroughly to prepare an expanding agent, ready for use.

[0066] 3. Mix ultra-fine calcium carbonate 20 parts, ultra-fine quartz 30 parts, ultra-fine fly ash 12 parts, ultra-fine red mud 10 parts, and ultra-fine cement 20 parts thoroughly to prepare an ultra-fine admixture, ready for use.

[0067] 4. Mix sodium carboxymethyl cellulose 10 parts, calcium tartrate 6 parts, sodium pyrophosphate 15 parts, and disodium ethylenediaminetetraacetate 15 parts thoroughly to prepare a setting time regulator, ready for use.

[0068] 5. Prepare an organic polymer by mixing polyvinyl alcohol and calcium polyacrylate at a ratio of 1:1, ready for use.

[0069] 6. Mix slag 80 parts, alkali-salt synergistic activator 12 parts, expanding agent 8 parts, ultra-fine admixture 20 parts, setting time regulator 5 parts, and organic polymer 12 parts thoroughly to prepare an alkali-activated slag-based cementitious material, ready for use.

[0070] 7. Mix the alkali-activated slag-based cementitious material with 200 parts of sand with a fineness modulus of 3.0 to obtain an alkali-activated tunnel lining repair material based on alkali-salt synergy.

[0071] Example 3

[0072] 1. Mix sodium silicate 10 parts, sodium sulfate 30 parts, sodium carbonate 5 parts, calcium sulfate 20 parts, sodium aluminate 10 parts, aluminum sulfate 8 parts, and calcium chloride 2 parts uniformly to prepare an alkali-salt synergistic activator, ready for use.

[0073] 2. Mix magnesium oxide 10 parts, calcium oxide 25 parts, and aluminum powder 4 parts thoroughly to prepare an expanding agent, ready for use.

[0074] 3. Mix ultra-fine calcium carbonate 10 parts, ultra-fine quartz 30 parts, ultra-fine fly ash 8 parts, ultra-fine red mud 10 parts, and ultra-fine cement 10 parts thoroughly to prepare an ultra-fine admixture, ready for use.

[0075] 4. Mix sodium carboxymethyl cellulose 5 parts, calcium tartrate 2 parts, sodium pyrophosphate 8 parts, and disodium ethylenediaminetetraacetate 15 parts thoroughly to prepare a setting time regulator, ready for use.

[0076] 5. Prepare an organic polymer by mixing polyvinyl alcohol and calcium polyacrylate at a ratio of 1:1, ready for use.

[0077] 6. Mix slag 80 parts, alkali-salt synergistic activator 5 parts, expanding agent 8 parts, ultra-fine admixture 20 parts, setting time regulator 5 parts, and organic polymer 12 parts thoroughly to prepare an alkali-activated slag-based cementitious material, ready for use.

[0078] 7. The alkali-activated slag-based cementitious material is mixed with 360 parts of sand with a fineness modulus of 2.0, to obtain the alkali-activated tunnel lining repair material based on alkali-salt synergy.

[0079] Example 4

[0080] 1. Sodium silicate 15 parts, sodium sulfate 20 parts, sodium carbonate 10 parts, calcium sulfate 12 parts, sodium aluminate 20 parts, aluminum sulfate 1 part, calcium chloride 5 parts are uniformly mixed to prepare an alkali-salt synergistic activator for standby.

[0081] 2. Magnesium oxide 18 parts, calcium oxide 15 parts, aluminum powder 9 parts are mixed to prepare an expanding agent for standby.

[0082] 3. Superfine calcium carbonate 20 parts, superfine quartz 15 parts, superfine fly ash 12 parts, superfine red mud 5 parts, superfine cement 20 parts are mixed to prepare a superfine admixture for standby.

[0083] 4. Sodium carboxymethyl cellulose 5 parts, calcium tartrate 2 parts, sodium pyrophosphate 15 parts, ethylenediaminetetraacetic acid disodium 15 parts are mixed to prepare a setting time regulator for standby.

[0084] 5. Polyvinyl alcohol and calcium polyacrylate are prepared in a ratio of 1:1 to prepare an organic polymer for standby.

[0085] 6. Mix 80 parts of slag, 5 parts of alkali-salt synergistic activator, 5 parts of expanding agent, 20 parts of superfine admixture, 5 parts of setting time regulator, and 12 parts of organic polymer to prepare an alkali-activated slag-based cementitious material for standby.

[0086] 7. The alkali-activated slag-based cementitious material is mixed with 360 parts of sand with a fineness modulus of 3.0, to obtain the alkali-activated tunnel lining repair material based on alkali-salt synergy.

[0087] Example 5

[0088] 1. Sodium silicate 15 parts, sodium sulfate 20 parts, sodium carbonate 10 parts, calcium sulfate 12 parts, sodium aluminate 20 parts, aluminum sulfate 1 part, calcium chloride 5 parts are uniformly mixed to prepare an alkali-salt synergistic activator for standby.

[0089] 2. Magnesium oxide 10 parts, calcium oxide 15 parts, aluminum powder 4 parts are mixed to prepare an expanding agent for standby.

[0090] 3. Superfine calcium carbonate 10 parts, superfine quartz 30 parts, superfine fly ash 8 parts, superfine red mud 10 parts, superfine cement 10 parts are mixed to prepare a superfine admixture for standby.

[0091] 4. Sodium carboxymethylcellulose 5 parts, calcium tartrate 6 parts, sodium pyrophosphate 15 parts, disodium ethylenediaminetetraacetate 15 parts are mixed thoroughly to prepare a setting time regulator, ready for use.

[0092] 5. Organic polymer is prepared by mixing polyvinyl alcohol and calcium polyacrylate at a ratio of 3:1, ready for use.

[0093] 6. Alkali-activated slag-based cementitious material is prepared by thoroughly mixing slag 80 parts, alkali-salt synergistic activator 5 parts, expansive agent 5 parts, superfine admixture 10 parts, setting time regulator 5 parts, and organic polymer 12 parts.

[0094] 7. The alkali-activated slag-based cementitious material is thoroughly mixed with 360 parts of sand with a fineness modulus of 3.0 to obtain an alkali-activated tunnel lining repair material based on alkali-salt synergy.

[0095] Example 6

[0096] 1. Alkali-salt synergistic activator is prepared by uniformly mixing sodium silicate 15 parts, sodium sulfate 20 parts, sodium carbonate 10 parts, calcium sulfate 12 parts, sodium aluminate 20 parts, aluminum sulfate 1 part, and calcium chloride 5 parts, ready for use.

[0097] 2. Expansive agent is prepared by thoroughly mixing magnesium oxide 10 parts, calcium oxide 15 parts, and aluminum powder 4 parts, ready for use.

[0098] 3. Superfine admixture is prepared by thoroughly mixing superfine calcium carbonate 10 parts, superfine quartz 15 parts, superfine fly ash 12 parts, superfine red mud 10 parts, and superfine cement 20 parts, ready for use.

[0099] 4. Setting time regulator is prepared by thoroughly mixing sodium carboxymethylcellulose 5 parts, calcium tartrate 6 parts, sodium pyrophosphate 8 parts, and disodium ethylenediaminetetraacetate 15 parts, ready for use.

[0100] 5. Organic polymer is prepared by mixing polyvinyl alcohol and calcium polyacrylate at a ratio of 3:1, ready for use.

[0101] 6. Alkali-activated slag-based cementitious material is prepared by thoroughly mixing slag 90 parts, alkali-salt synergistic activator 12 parts, expansive agent 8 parts, superfine admixture 20 parts, setting time regulator 5 parts, and organic polymer 12 parts.

[0102] 7. The alkali-activated slag-based cementitious material is thoroughly mixed with 360 parts of sand with a fineness modulus of 3.0 to obtain an alkali-activated tunnel lining repair material based on alkali-salt synergy.

[0103] Example 7

[0104] 1. Mix sodium silicate 15 parts, sodium sulfate 20 parts, sodium carbonate 10 parts, calcium sulfate 12 parts, sodium aluminate 20 parts, aluminum sulfate 1 part, calcium chloride 5 parts uniformly to prepare an alkali-salt synergistic activator for standby.

[0105] 2. Mix magnesium oxide 10 parts, calcium oxide 15 parts, aluminum powder 4 parts thoroughly to prepare an expanding agent for standby.

[0106] 3. Mix superfine calcium carbonate 20 parts, superfine quartz 30 parts, superfine fly ash 8 parts, superfine red mud 5 parts, superfine cement 10 parts thoroughly to prepare a superfine admixture for standby.

[0107] 4. Mix sodium carboxymethyl cellulose 10 parts, calcium tartrate 2 parts, sodium pyrophosphate 15 parts, disodium ethylenediaminetetraacetate 10 parts thoroughly to prepare a setting time regulator for standby.

[0108] 5. Prepare an organic polymer by mixing polyvinyl alcohol and calcium polyacrylate at a ratio of 3:1 for standby.

[0109] 6. Mix slag 90 parts, alkali-salt synergistic activator 12 parts, expanding agent 8 parts, superfine admixture 20 parts, setting time regulator 5 parts, organic polymer 12 parts thoroughly to prepare an alkali-activated slag-based cementitious material for standby.

[0110] 7. Mix the alkali-activated slag-based cementitious material with 360 parts of sand with a fineness modulus of 3.0 to obtain an alkali-activated tunnel lining repair material based on alkali-salt synergy.

[0111] Example 8

[0112] 1. Mix sodium silicate 15 parts, sodium sulfate 20 parts, sodium carbonate 10 parts, calcium sulfate 12 parts, sodium aluminate 20 parts, aluminum sulfate 1 part, calcium chloride 5 parts uniformly to prepare an alkali-salt synergistic activator for standby.

[0113] 2. Mix magnesium oxide 10 parts, calcium oxide 15 parts, aluminum powder 4 parts thoroughly to prepare an expanding agent for standby.

[0114] 3. Mix superfine calcium carbonate 10 parts, superfine quartz 30 parts, superfine fly ash 12 parts, superfine red mud 5 parts, superfine cement 10 parts thoroughly to prepare a superfine admixture for standby.

[0115] 4. Mix sodium carboxymethyl cellulose 10 parts, calcium tartrate 6 parts, sodium pyrophosphate 15 parts, disodium ethylenediaminetetraacetate 10 parts thoroughly to prepare a setting time regulator for standby.

[0116] 5. Prepare an organic polymer by mixing polyvinyl alcohol and calcium polyacrylate at a ratio of 3:1 for standby.

[0117] 6. Take 90 parts of slag, 12 parts of alkali-salt synergistic activator, 5 parts of expansive agent, 10 parts of superfine admixture, 2 parts of setting time regulator, and 8 parts of organic polymer, mix thoroughly to prepare alkali-activated slag-based cementitious material, ready for use.

[0118] 7. Mix the alkali-activated slag-based cementitious material with 360 parts of sand with fineness modulus of 3.0 to obtain alkali-activated tunnel lining repair material based on alkali-salt synergy.

[0119] Comparative Example 1

[0120] 1. Take 15 parts of sodium silicate as alkali activator, ready for use.

[0121] 2. Mix 10 parts of magnesium oxide, 15 parts of calcium oxide, and 4 parts of aluminum powder thoroughly to prepare expansive agent, ready for use.

[0122] 3. Mix 10 parts of superfine calcium carbonate, 30 parts of superfine quartz, 12 parts of superfine fly ash, 5 parts of superfine red mud, and 10 parts of superfine cement thoroughly to prepare superfine admixture, ready for use.

[0123] 4. Mix 10 parts of sodium carboxymethyl cellulose, 6 parts of calcium tartrate, 15 parts of sodium pyrophosphate, and 10 parts of disodium ethylenediaminetetraacetate thoroughly to prepare setting time regulator, ready for use.

[0124] 5. Prepare organic polymer by mixing polyvinyl alcohol and calcium polyacrylate at a ratio of 3:1, ready for use.

[0125] 6. Take 90 parts of slag, 12 parts of alkali-salt synergistic activator, 5 parts of expansive agent, 10 parts of superfine admixture, 2 parts of setting time regulator, and 8 parts of organic polymer, mix thoroughly to prepare alkali-activated slag-based cementitious material, ready for use.

[0126] 7. Mix the alkali-activated slag-based cementitious material with 360 parts of sand with fineness modulus of 3.0 to obtain alkali-activated tunnel lining repair material based on alkali-salt synergy.

[0127] Prepare the slurry with water-cement ratio of 0.5, and test the compressive strength, flexural strength, bonding strength, and volume stability after 7 days of standard curing.

[0128] Comparative Example 2

[0129] The difference between Example 8 and Comparative Example 2 is that calcium chloride is not added to the alkali-salt synergistic activator. The preparation method includes:

[0130] 1. Mix 15 parts of sodium silicate, 25 parts of sodium sulfate, 10 parts of sodium carbonate, 12 parts of calcium sulfate, 20 parts of sodium aluminate, and 1 part of aluminum sulfate uniformly to prepare alkali-salt synergistic activator, ready for use.

[0131] 2. Magnesium oxide 10 parts, calcium oxide 15 parts, aluminum powder 4 parts are mixed thoroughly to prepare an expanding agent, ready for use.

[0132] 3. Superfine calcium carbonate 10 parts, superfine quartz 30 parts, superfine fly ash 12 parts, superfine red mud 5 parts, superfine cement 10 parts are mixed thoroughly to prepare a superfine admixture, ready for use.

[0133] 4. Sodium carboxymethyl cellulose 10 parts, calcium tartrate 6 parts, sodium pyrophosphate 15 parts, disodium ethylenediaminetetraacetate 10 parts are mixed thoroughly to prepare a setting time regulator, ready for use.

[0134] 5. Polyvinyl alcohol and calcium polyacrylate are prepared in a ratio of 3:1 to form an organic polymer, ready for use.

[0135] 6. Slag 90 parts, alkali-salt synergistic activator 12 parts, expanding agent 5 parts, superfine admixture 10 parts, setting time regulator 2 parts, organic polymer 8 parts are mixed thoroughly to prepare an alkali-activated slag-based cementitious material, ready for use.

[0136] 7. The alkali-activated slag-based cementitious material is mixed with 360 parts of sand with a fineness modulus of 3.0 to obtain an alkali-activated tunnel lining repair material based on alkali-salt synergy.

[0137] Comparative Example 3

[0138] The difference from Example 8 is that sodium sulfate is not added to the alkali-salt synergistic activator. The preparation method includes:

[0139] 1. Sodium silicate 15 parts, sodium carbonate 10 parts, sodium aluminate 20 parts, aluminum chloride 1 part, calcium chloride 37 parts are mixed uniformly to prepare an alkali-salt synergistic activator, ready for use.

[0140] 2. Magnesium oxide 10 parts, calcium oxide 15 parts, aluminum powder 4 parts are mixed thoroughly to prepare an expanding agent, ready for use.

[0141] 3. Superfine calcium carbonate 10 parts, superfine quartz 30 parts, superfine fly ash 12 parts, superfine red mud 5 parts, superfine cement 10 parts are mixed thoroughly to prepare a superfine admixture, ready for use.

[0142] 4. Sodium carboxymethyl cellulose 10 parts, calcium tartrate 6 parts, sodium pyrophosphate 15 parts, disodium ethylenediaminetetraacetate 10 parts are mixed thoroughly to prepare a setting time regulator, ready for use.

[0143] 5. Polyvinyl alcohol and calcium polyacrylate are prepared in a ratio of 3:1 to form an organic polymer, ready for use.

[0144] 6. Take 90 parts of slag, 12 parts of alkali-salt synergistic activator, 5 parts of expansive agent, 10 parts of superfine admixture, 2 parts of setting time regulator, and 8 parts of organic polymer, mix thoroughly to prepare alkali-activated slag-based cementitious material, ready for use.

[0145] 7. Mix the alkali-activated slag-based cementitious material with 360 parts of sand with fineness modulus of 3.0 to obtain alkali-activated tunnel lining repair material based on alkali-salt synergy.

[0146] Comparative Example 4

[0147] The difference from Example 8 is that sodium aluminate is not added to the alkali-salt synergistic activator. The preparation method includes:

[0148] 1. Mix 15 parts of sodium silicate, 25 parts of sodium sulfate, 10 parts of sodium carbonate, 12 parts of calcium sulfate, and 21 parts of aluminum sulfate uniformly to prepare alkali-salt synergistic activator, ready for use.

[0149] 2. Mix 10 parts of magnesium oxide, 15 parts of calcium oxide, and 4 parts of aluminum powder thoroughly to prepare expansive agent, ready for use.

[0150] 3. Mix 10 parts of superfine calcium carbonate, 30 parts of superfine quartz, 12 parts of superfine fly ash, 5 parts of superfine red mud, and 10 parts of superfine cement thoroughly to prepare superfine admixture, ready for use.

[0151] 4. Mix 10 parts of sodium carboxymethyl cellulose, 6 parts of calcium tartrate, 15 parts of sodium pyrophosphate, and 10 parts of disodium ethylenediaminetetraacetate thoroughly to prepare setting time regulator, ready for use.

[0152] 5. Prepare organic polymer by mixing polyvinyl alcohol and calcium polyacrylate at a ratio of 3:1, ready for use.

[0153] 6. Take 90 parts of slag, 12 parts of alkali-salt synergistic activator, 5 parts of expansive agent, 10 parts of superfine admixture, 2 parts of setting time regulator, and 8 parts of organic polymer, mix thoroughly to prepare alkali-activated slag-based cementitious material, ready for use.

[0154] 7. Mix the alkali-activated slag-based cementitious material with 360 parts of sand with fineness modulus of 3.0 to obtain alkali-activated tunnel lining repair material based on alkali-salt synergy.

[0155] Comparative Example 5

[0156] The difference from Example 8 is that aluminum sulfate is not added to the alkali-salt synergistic activator. The preparation method includes:

[0157] 1. Mix 15 parts of sodium silicate, 25 parts of sodium sulfate, 10 parts of sodium carbonate, 12 parts of calcium sulfate, and 21 parts of sodium aluminate uniformly to prepare alkali-salt synergistic activator, ready for use.

[0158] 2. Magnesium oxide 10 parts, calcium oxide 15 parts, aluminum powder 4 parts are mixed thoroughly to prepare an expanding agent for standby.

[0159] 3. Superfine calcium carbonate 10 parts, superfine quartz 30 parts, superfine fly ash 12 parts, superfine red mud 5 parts, superfine cement 10 parts are mixed thoroughly to prepare a superfine admixture for standby.

[0160] 4. Sodium carboxymethylcellulose 10 parts, calcium tartrate 6 parts, sodium pyrophosphate 15 parts, ethylenediaminetetraacetic acid disodium 10 parts are mixed thoroughly to prepare a setting time regulator for standby.

[0161] 5. Polyvinyl alcohol and calcium polyacrylate are prepared into an organic polymer at a ratio of 3:1 for standby.

[0162] 6. Slag 90 parts, alkali-salt synergistic activator 12 parts, expanding agent 5 parts, superfine admixture 10 parts, setting time regulator 2 parts, organic polymer 8 parts are mixed thoroughly to prepare an alkali-activated slag-based cementitious material for standby.

[0163] 7. The alkali-activated slag-based cementitious material is mixed with 360 parts of sand with a fineness modulus of 3.0 to obtain an alkali-activated tunnel lining repair material based on alkali-salt synergy.

[0164] As shown in Table 1, the alkali-activated tunnel lining repair material based on alkali-salt synergy prepared by the present application has better mechanical strength and volume stability, which can meet the use requirements of tunnel lining repair.

[0165] As shown in Table 1, the alkali-activated tunnel lining repair material based on alkali-salt synergy prepared by the present application has better mechanical strength and volume stability, which can meet the use requirements of tunnel lining repair. Figure 1 、 Figure 2 As shown in Table 1, the alkali-activated tunnel lining repair material based on alkali-salt synergy prepared by the present application has better mechanical strength and volume stability, which can meet the use requirements of tunnel lining repair.

[0166] As shown in Table 1, the alkali-activated tunnel lining repair material based on alkali-salt synergy prepared by the present application has better mechanical strength and volume stability, which can meet the use requirements of tunnel lining repair.

[0167] As shown in Table 1, the alkali-activated tunnel lining repair material based on alkali-salt synergy prepared by the present application has better mechanical strength and volume stability, which can meet the use requirements of tunnel lining repair.

[0168] Table 1 Test results of performance parameters of repair materials

[0169]

[0170] The above merely provides the preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the principles and technical scope of the present application shall fall into the scope of the present application.

Claims

1. A base-activated tunnel lining repair material based on alkali-salt synergy, characterized in that, The alkali-salt synergistic activator is composed of the following raw materials in parts by weight: sodium silicate 10-15 parts, sodium sulfate 20-30 parts, sodium carbonate 5-10 parts, calcium sulfate 12-20 parts, sodium aluminate 10-20 parts, aluminum sulfate 1-8 parts, and calcium chloride 2-5 parts; The organic polymer is composed of polyvinyl alcohol and calcium polyacrylate, and the ratio of the two is 1:1-3:

1. The sand has a fineness modulus of 2.0-3.

0. The expansive agent is composed of the following raw materials in parts by weight: magnesium oxide 10-18 parts, calcium oxide 15-25 parts, and aluminum powder 4-9 parts.

2. The alkali-salt synergy based alkali activated tunnelling lining repair material according to claim 1, characterized in that, The slag is a slag after drying and grinding, and has a specific surface area of 400-800 m 2 / kg and a water content of <1%.

3. The alkali-salt synergy based alkali activated tunnelling lining repair material according to claim 1, wherein The super-fine admixture is composed of the following raw materials in parts by weight: super-fine calcium carbonate 10-20 parts, super-fine quartz 15-30 parts, super-fine fly ash 8-12 parts, super-fine red mud 5-10 parts, and super-fine cement 10-20 parts.

4. The alkali-salt synergy based alkali activated tunnelling lining repair material according to claim 1, characterized in that, The setting time regulator is composed of the following raw materials in parts by weight: sodium carboxymethyl cellulose 5-10 parts, calcium tartrate 2-6 parts, sodium pyrophosphate 8-15 parts, and disodium ethylenediaminetetraacetate 10-15 parts.

5. The alkali-salt synergy based alkali activated tunnelling lining repair material according to claim 4, characterized in that, The superfine admixture has a specific surface area of each component > 1200 m 2 / kg.

6. The alkali-salt synergy based alkali activated tunnelling lining repair material according to claim 1, characterized in that, The method comprises the following steps:

7. A method of producing the alkali-activated tunnel lining patching material based on alkali-salt synergy according to any one of claims 1 to 6, characterized in that, The ground slag is mixed with the alkali-salt synergistic activator, the expansive agent, the super-fine admixture, the setting time regulator, and the organic polymer to obtain the alkali-activated slag cementitious material. The slag is dried to a moisture content of <1% and then ground to a specific surface area of 400-800 m 2 / kg; The alkali-activated slag cementitious material is mixed with the sand to obtain the product. The mixing is performed by mechanical stirring.

8. The method of producing an alkali-activated tunnel lining patching material based on alkali-salt synergy according to claim 7, characterized in that, ​

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