CN107935516B - Micro-expansion grouting material for grouting with mold at arch crown of tunnel lining - Google Patents
Micro-expansion grouting material for grouting with mold at arch crown of tunnel lining Download PDFInfo
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- CN107935516B CN107935516B CN201711142603.5A CN201711142603A CN107935516B CN 107935516 B CN107935516 B CN 107935516B CN 201711142603 A CN201711142603 A CN 201711142603A CN 107935516 B CN107935516 B CN 107935516B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00146—Sprayable or pumpable mixtures
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Lining And Supports For Tunnels (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a micro-expansion grouting material for grouting a tunnel lining vault with a mold, which mainly solves the problem that the existing grouting material generally has the quality defects of void, cracking and the like of the tunnel vault caused by easy shrinkage deformation, insufficient compatibility and bonding property. The micro-expansion grouting material is prepared by adding water into 750-800 parts of a gelling component, 900-1350 parts of composite graded quartz sand, 100-150 parts of a graphene oxide modified mineral admixture, 8-10 parts of a volume stability regulator and 2-3 parts of an enhanced water reducing agent, and mixing and stirring, wherein the water-material ratio is 0.16-0.19. The micro-expansion grouting material has better fluidity and pumpability, has good bonding performance with lining concrete, and has remarkable economic and social benefits in the capital construction industry.
Description
Technical Field
The invention relates to the technical field of concrete materials, in particular to a micro-expansion grouting material for grouting a tunnel lining vault with a mold.
Background
In the process of pouring tunnel arch lining concrete, the quality defects of insufficient thickness, void, cracking and the like of the arch top lining concrete are easily caused due to insufficient pumping pressure or premature pipe drawing and the like. In order to improve the lining quality of a railway tunnel and prevent the concrete of the tunnel vault from falling into blocks in the operation process, a tunnel vault with a mould grouting construction technology is successfully developed by a special command department of Tokyo Ji guest in Middle, a lining trolley is transformed by the technology, a certain number of grouting holes are arranged at the central line position of a template of the lining trolley along the longitudinal direction of the trolley, a fixing flange for grouting is installed, active powder concrete (RPC) grouting pipes are embedded, and grouting is timely carried out from the embedded grouting pipes after the concrete pouring is finished. The construction technology not only simplifies the traditional grouting process, but also obviously improves the grouting quality. However, in the tape-casting process, the backfill grouting material is required to have good compatibility with lining concrete, effective repairability (lining part with insufficient thickness) and good cohesiveness, and in addition, the backfill grouting material is also required to have certain permeability to the concrete due to the long pouring process and pouring time.
Therefore, the micro-expansion grouting material for grouting the arch crown of the tunnel lining with the mold is provided, the grouting material adopts filling mortar with various indexes superior to the performance of lining concrete, the bonding performance with the concrete is good, the fluidity is good, the pumpability and the micro-expansion performance are realized, the construction time is long, the bleeding and the contraction are avoided, the strength after the solidification is high, the filling effect can be realized, the defects of secondary lining concrete can be made up or repaired, particularly the construction joints are made up, and the integral bearing capacity of the lining concrete is improved.
Disclosure of Invention
The invention aims to solve the problem that the existing micro-expansion grouting material for grouting with a mold at the arch crown of a tunnel lining has the quality defects of void, cracking and the like at the arch crown of the tunnel caused by easy shrinkage deformation, insufficient compatibility and binding property, and provides the micro-expansion grouting material for grouting with the mold at the arch crown of the tunnel lining. The grouting material has good fluidity, pumpability and micro-expansibility, has good bonding performance with lining concrete, can be constructed for a long time, does not bleed or shrink, has a certain internal curing effect, can improve the humidity field inside the concrete, improve the moisture content inside the concrete, and effectively reduce the self-shrinkage of the concrete, thereby effectively controlling the generation of concrete shrinkage cracks. In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a micro-expansion grouting material for grouting a tunnel lining vault belt mold comprises the following components: gel component, composite graded quartz sand, graphene oxide modified mineral admixture, volume stability regulator, enhanced water reducer and water.
Further, the micro-expansion grouting material comprises the following components in parts by weight: 750-800 parts of a gelling component, 900-1350 parts of composite graded quartz sand, 100-150 parts of a graphene oxide modified mineral admixture, 8-10 parts of a volume stability regulator, 2-3 parts of an enhanced water reducing agent and 0.16-0.19 of a water-material ratio.
Further, the gelling component is prepared by mixing ordinary portland cement and sulphoaluminate cement according to a mass ratio of 19:1, then adding triethanolamine which is 0.05 percent of the total mass of the two cements, and grinding the mixture to a specific surface area of 400-500 m2Is calculated by/kg. Grinding allows the material to have good permeability and pourability.
Further, the composite graded quartz sand is formed by uniformly mixing quartz sand with the grain sizes of 40-70 meshes and 20-40 meshes according to the mass ratio of 8: 1.
Further, the graphene oxide modified mineral admixture is prepared by dispersing graphene oxide in water, adding silica fume and fly ash, stirring and drying. Wherein the dosage of the graphene oxide is 0.05 percent of the mass of the gel component, the total dosage of the silica fume and the fly ash is 13 percent of the mass of the gel component, and the mass ratio of the silica fume to the fly ash is 1: 2.
Furthermore, the fly ash is II-grade fly ash, and the density of the II-grade fly ash is 2.60-2.75 g/cm3The specific surface area is more than 3500cm2(ii)/g; the silica fume has an average particle size of 0.1-0.3 μm, a specific surface area of 20-28 m/g, and SiO2The content is about 90 percent.
Further, the volume stability regulator is formed by uniformly mixing a concrete expanding agent, red brick powder and super absorbent resin SAP according to the mass ratio of 6:3: 1. The maximum particle size of the red brick powder is about 0.85mm, and the water absorption multiplying power is 70-100 g/g; the particle size of the super absorbent resin SAP is 190-250 mu m, and the density is 0.70g/cm3. Wherein the red brick powder and super absorbent resin SAP are used as internal curing material, and can beThe humidity field in the concrete is improved, the moisture content in the concrete is improved, and therefore the generation of concrete shrinkage cracks is effectively controlled.
Further, the enhanced water reducing agent is formed by uniformly mixing a high-efficiency polycarboxylic acid water reducing agent and lithium carbonate according to the mass ratio of 5: 1.
Compared with the prior art, the invention has the following beneficial effects: (1) the problems that the existing micro-expansion grouting material for grouting the arch crown with the mold of the tunnel lining has the quality defects of void, cracking and the like caused by easy shrinkage deformation and insufficient compatibility and associativity are solved; (2) the prepared micro-expansion grouting material has good fluidity and pumpability, has good bonding capacity with lining concrete, long construction time, no bleeding and no shrinkage, has a certain internal curing effect, can improve the humidity field in the concrete, improve the moisture content in the concrete, and effectively reduce the self-shrinkage of the concrete, thereby effectively controlling the generation of concrete shrinkage cracks; (3) the compressive strength and the flexural strength of the combination body between the micro-expansion grouting material and the lining concrete provided by the invention are higher than those of the concrete, so that the filling effect can be achieved, and the defects of secondary lining concrete, especially construction joints, can be made up or repaired, thereby improving the overall bearing capacity of the lining concrete.
Detailed Description
In order to make those skilled in the art fully understand the technical solutions and advantages of the present invention, the following embodiments are further described.
The micro-expansion grouting material for grouting the arch crown with the mold of the tunnel lining is prepared by mixing the following raw materials in parts by weight: 750-800 parts of a gelling component, 900-1350 parts of composite graded quartz sand, 100-150 parts of a graphene oxide modified mineral admixture, 8-10 parts of a volume stability regulator, 2-3 parts of an enhanced water reducing agent and 0.16-0.19 of a water-material ratio. Wherein the gelling component is prepared by mixing 42.5-grade ordinary portland cement and 42.5-grade sulphoaluminate cement according to the mass ratio of 19:1, adding triethanolamine which is 0.05 percent of the total mass of the two cements, and grinding the mixture until the specific surface area is 400-500 m2Is calculated by/kg. The compound is usedThe combined-grade quartz sand is prepared by uniformly mixing quartz sand with the particle size of 40-70 meshes and 20-40 meshes according to the mass ratio of 8:1, wherein SiO in the quartz sand2The content of (A) is about 99%. The graphene oxide modified mineral admixture is prepared by ultrasonically dispersing graphene oxide accounting for 0.05 percent of the mass of a cementing material in water, adding a silica fume-fly ash mixture (the mass ratio of the silica fume to the fly ash is 1:2) accounting for 13 percent of the mass of the cementing material, and grinding, wherein the fly ash is II-grade fly ash, and the density of the fly ash is 2.60-2.75 g/cm3The specific surface area is more than 3500cm2(ii)/g; the silica fume has an average particle size of 0.1-0.3 μm, a specific surface area of 20-28 m/g, and SiO2The content is about 90 percent. The volume stability regulator is prepared by uniformly mixing a concrete expanding agent, red brick powder and super absorbent resin SAP according to the mass ratio of 6:3:1, wherein the red brick powder is ground to the maximum particle size of about 0.85mm, the water absorption rate is 70-100g/g, the super absorbent resin SAP has the particle size of 190-250 mu m and the density of 0.70g/cm3. The enhanced water reducing agent is prepared by uniformly mixing a powdery high-efficiency polycarboxylic acid water reducing agent and lithium carbonate according to the mass ratio of 5: 1.
Examples 1-5 formulations of the micro-expansive slip casting formulations are shown in table 1 below.
TABLE 1 formulation of the micro-expansive slip casting materials of examples 1-5
The preparation method of the micro-expansion grouting material in each example is as follows: weighing corresponding amounts of components according to the formula (weight parts) in the table, wherein a volume stability regulator, an enhanced water reducing agent and a hydration mark component A, and a gelling component, composite graded quartz sand and graphene oxide modified mineral admixture are combined to be a component B, gradually adding substances in the component B into the component A under a stirring state to form uniform slurry, and the slurry is the micro-expansion grouting material for tunnel lining vault belt mold grouting.
In order to fully understand the actual performance of the micro-expansive grouting material prepared by the embodiment of the invention, corresponding tests are carried out and compared with the standard reference value required by the basic performance of the micro-expansive grouting material. Inspecting the fluidity of the discharged machine and the retention value of the fluidity for 90min by referring to GB50448-2015 technical Specification for application of cement-based grouting materials, wherein the stirring mode is a low-speed stirring mode, and the stirring time is 3 min; and the 90min fluidity retention value is the fluidity value tested according to the requirements after the machine-out fluidity test is finished and the machine-out fluidity test is placed for 90min, and then the machine-out fluidity retention value is stirred at low speed for 1 min. The plastic expansion rate is tested according to the temporary technical conditions of the CRTS II slab ballastless track cement emulsified asphalt mortar of passenger special line railway, and the plastic expansion rate is measured for 3 hours. The compression strength and the rupture strength are tested according to GB/T17671-1999, the curing condition of the demoulded test piece is (20 +/-2) DEG C, the relative humidity is not less than 90 percent, and the test piece cannot be soaked in water or directly drenched with water. And when the strength of the test piece is tested under the same condition, the test piece is demoulded and then is coated by using a winding film. The 24h binding strength was tested according to GB/T50081. The test results are shown in table 2 below.
Table 2 table of performance test results of micro-expansive grouting materials in examples 1 to 5
The results in table 2 show that the micro-expansion grouting material for belt grouting of a tunnel lining vault provided by the embodiments of the present application has high machine-out fluidity and 90min fluidity, and has good fluidity and pumpability. The plastic expansion rate is 0.6-1.2%, and the micro-expansion property is certain. The compression strength and the rupture strength of 12h, 1d and 28d are all higher than the standard values. The adhesive has high bonding strength, has good bonding performance with lining concrete, can be constructed for a long time, does not bleed or shrink, has a certain internal curing effect, and solves the problem that the existing micro-expansion grouting material for grouting the arch crown of the tunnel lining with the mold has quality defects of void, cracking and the like due to easy shrinkage deformation, insufficient compatibility and bonding property.
Claims (4)
1. The micro-expansion grouting material for grouting the arch crown with the mold of the tunnel lining is characterized by comprising the following components in parts by weight: 750-800 parts of gel component and 900-1350 parts of composite graded quartz sand100-150 parts of graphene oxide modified mineral admixture, 8-10 parts of volume stability regulator and 2-3 parts of enhanced water reducer, and adding water after mixing to enable the weight ratio of water to material to be 0.16-0.19; the gel component is prepared by mixing ordinary portland cement and sulphoaluminate cement according to a mass ratio of 19:1, then adding triethanolamine which is 0.05 percent of the total mass of the two cements, and grinding the mixture to a specific surface area of 400-500 m2Is/kg; the graphene oxide modified mineral admixture is prepared by dispersing graphene oxide in water, adding silica fume and fly ash, stirring and drying, wherein the amount of the graphene oxide is 0.05% of the mass of the gel component, the total amount of the silica fume and the fly ash is 13% of the mass of the gel component, and the mass ratio of the silica fume to the fly ash is 1: 2; the volume stability regulator is formed by uniformly mixing a concrete expanding agent, red brick powder and super absorbent resin SAP according to the mass ratio of 6:3: 1; the enhanced water reducing agent is prepared by uniformly mixing a high-efficiency polycarboxylic acid water reducing agent and lithium carbonate according to the mass ratio of 5: 1.
2. A micro-expansive grout for grouting a tunnel lining vault belt mold according to claim 1, characterized in that: the composite graded quartz sand is prepared by uniformly mixing quartz sand with the particle size of 40-70 meshes and 20-40 meshes according to the mass ratio of 8: 1.
3. A micro-expansive grout for grouting a tunnel lining vault belt mold according to claim 1, characterized in that: the fly ash is II-grade fly ash, and the density of the fly ash is 2.60-2.75 g/cm3The specific surface area is more than 3500cm2/g。
4. A micro-expansive grout for grouting a tunnel lining vault belt mold according to claim 1, characterized in that: the maximum particle size of the red brick powder is 0.85mm, and the water absorption multiplying power of the red brick powder is 70-100 g/g; the particle size of the super absorbent resin SAP is 190-250 mu m, and the density is 0.70g/cm3。
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| CN108625878A (en) * | 2018-05-14 | 2018-10-09 | 北京铁科首钢轨道技术股份有限公司 | A kind of technique for solving the problems, such as tunnel-liner vault and coming to nothing |
| CN108558330B (en) * | 2018-05-22 | 2021-01-08 | 武汉源锦建材科技有限公司 | Micro-expansion grouting material for grouting with mold at arch crown of tunnel lining |
| CN109250987A (en) * | 2018-10-19 | 2019-01-22 | 郝鹏飞 | A kind of tunnel band is molded into pulp material |
| CN109503092A (en) * | 2018-12-24 | 2019-03-22 | 河南城建学院 | Early strong impervious, cement base grouting material of height containing graphene oxide and preparation method thereof |
| CN112047700B (en) * | 2020-09-14 | 2023-03-24 | 江西龙正科技发展有限公司 | Rapid maintenance reinforcing adhesive for roads and bridges and preparation method thereof |
| CN112321245A (en) * | 2020-11-02 | 2021-02-05 | 江苏绿和环境科技有限公司 | Formula of sleeve grouting material |
| CN112390595B (en) * | 2020-12-04 | 2022-04-01 | 武汉理工大学 | Red facing mortar based on wet-milled superfine red brick slurry |
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