CN110510954A - High-strength sprayed concrete for high-ground-temperature tunnel and preparation method thereof - Google Patents
High-strength sprayed concrete for high-ground-temperature tunnel and preparation method thereof Download PDFInfo
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- CN110510954A CN110510954A CN201910892544.6A CN201910892544A CN110510954A CN 110510954 A CN110510954 A CN 110510954A CN 201910892544 A CN201910892544 A CN 201910892544A CN 110510954 A CN110510954 A CN 110510954A
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- 239000011378 shotcrete Substances 0.000 title claims abstract description 37
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 239000004567 concrete Substances 0.000 claims abstract description 94
- 239000000835 fiber Substances 0.000 claims abstract description 63
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000000843 powder Substances 0.000 claims abstract description 34
- 239000004568 cement Substances 0.000 claims abstract description 27
- 239000010881 fly ash Substances 0.000 claims abstract description 25
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 23
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 23
- 239000010959 steel Substances 0.000 claims abstract description 23
- 239000002893 slag Substances 0.000 claims abstract description 22
- 239000004576 sand Substances 0.000 claims abstract description 21
- 239000002994 raw material Substances 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims description 45
- 231100000241 scar Toxicity 0.000 claims description 43
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 34
- 238000002347 injection Methods 0.000 claims description 32
- 239000007924 injection Substances 0.000 claims description 32
- 239000004115 Sodium Silicate Substances 0.000 claims description 24
- 235000019795 sodium metasilicate Nutrition 0.000 claims description 24
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 24
- 239000011521 glass Substances 0.000 claims description 21
- 239000011324 bead Substances 0.000 claims description 19
- 238000005498 polishing Methods 0.000 claims description 10
- 235000019353 potassium silicate Nutrition 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 8
- 238000012545 processing Methods 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 7
- 230000015271 coagulation Effects 0.000 claims description 6
- 238000005345 coagulation Methods 0.000 claims description 6
- 239000011398 Portland cement Substances 0.000 claims description 3
- 239000003292 glue Substances 0.000 claims description 3
- 238000007781 pre-processing Methods 0.000 claims description 2
- 238000003980 solgel method Methods 0.000 claims description 2
- 238000005336 cracking Methods 0.000 abstract description 8
- 238000004090 dissolution Methods 0.000 abstract description 5
- 239000003795 chemical substances by application Substances 0.000 abstract description 3
- 238000002844 melting Methods 0.000 abstract description 3
- 230000008018 melting Effects 0.000 abstract description 3
- 239000011148 porous material Substances 0.000 abstract 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 26
- 229920002451 polyvinyl alcohol Polymers 0.000 description 26
- 230000000052 comparative effect Effects 0.000 description 9
- 238000012423 maintenance Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 4
- 238000003776 cleavage reaction Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 239000011435 rock Substances 0.000 description 4
- 230000007017 scission Effects 0.000 description 4
- 239000002689 soil Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 241000218691 Cupressaceae Species 0.000 description 1
- MKYBYDHXWVHEJW-UHFFFAOYSA-N N-[1-oxo-1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propan-2-yl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(C(C)NC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 MKYBYDHXWVHEJW-UHFFFAOYSA-N 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000003487 anti-permeability effect Effects 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000007676 flexural strength test Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 229920005646 polycarboxylate Polymers 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000005945 translocation Effects 0.000 description 1
- 239000010920 waste tyre Substances 0.000 description 1
Classifications
-
- 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
- C04B28/04—Portland cements
-
- 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
- C04B2111/00155—Sprayable, i.e. concrete-like, materials able to be shaped by spraying instead of by casting, e.g. gunite
-
- 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
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/76—Use at unusual temperatures, e.g. sub-zero
- C04B2111/763—High temperatures
-
- 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
- C04B2201/10—Mortars, concrete or artificial stone characterised by specific physical values for the viscosity
-
- 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
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a high-strength sprayed concrete for a high-ground-temperature tunnel and a preparation method thereof, wherein the concrete comprises the following raw material components: cement, fly ash, slag powder, sand, coarse aggregate, vitrified micro bubbles, PVA fibers, steel fibers, modified rubber, a water reducing agent, an accelerating agent and water. According to the invention, the low-melting-point water-soluble PVA fiber is adopted, so that after the concrete reaches the fiber melting point, the fiber is melted to form a pore passage, which is convenient for the dissipation of water vapor in the concrete at high temperature, the steam pressure in the concrete is reduced, and the burst risk is reduced; meanwhile, the dissolution of the water-soluble PVA fiber greatly enhances the internal cohesive force of the concrete and avoids the cracking of a cementing surface. Through the mutual matching of the raw materials, the prepared concrete has the characteristics of low heat conductivity coefficient, good impermeability, high interface bonding strength and small later strength loss, the later strength of the sprayed concrete is greatly improved, and the cracking problem of the high-ground-temperature concrete is solved.
Description
Technical field
The invention belongs to technical field of concrete more particularly to a kind of High-geotemperature tunnel high-strength shotcrete and its systems
Preparation Method.
Background technique
After High-geotemperature tunnel excavation, due to excavating scar temperature height (up to 80 DEG C or more), the coagulation local product after gunite concrete
Rationality matter and failure mode change, and often result in that late strength of concrete is low, and rebound degree is high, and intensity distribution is uneven, concrete
The diseases such as cracking.
Due to the migration of High-geotemperature concrete coagulation process hydrone, keep inside concrete compactness uneven, in difference
Normal stress is presented near cement plane and cement plane the problem of concrete cracking at a temperature of.And it is then along cement plane cracking
One of the most common type concrete destruction.
Summary of the invention
To solve the above-mentioned problems, the purpose of the present invention is to propose to a kind of High-geotemperature tunnel high-strength shotcrete and its
Preparation method.Gained concrete has thermal coefficient low, and anti-permeability performance is good, and interface binding intensity is high, and later strength is lost small
Feature, the later strength after substantially increasing concrete ejection solve the problem of Cracking of High-geotemperature concrete.
In order to achieve the above object, the present invention is resolved using following technical scheme.
A kind of High-geotemperature tunnel high-strength shotcrete includes following raw material components: cementitious material, sand, coarse aggregate, glass
Change microballon, polyvinyl alcohol (PVA) fiber, steel fibre, modified rubber, water-reducing agent, accelerator and water；Wherein, the cementitious material
For cement, flyash and slag powders.
Further, the dosage of the raw material are as follows: 1m3Contained material quality is respectively as follows: 450~500kg of cementitious material, sand
600~650kg, 460~490kg of coarse aggregate, 100~120kg of glass bead, 1~2kg of PVA fiber, 35~40kg of steel fibre,
28~32kg of modified rubber, water-reducing agent quality are the 0.8% of cementitious material, accelerator quality is cementitious material 5%, water and glue
The mass ratio of gel material is 0.45；Wherein, in the cementitious material each raw material quality accounting are as follows: cement 70%, flyash
15%, slag powders 15%.
Further, the coarse aggregate is rubble.
Further, the partial size of the glass bead is 1~2mm.
Further, 70~80 DEG C of the fusing point of the PVA fiber.
Further, the diameter of the steel fibre be 0.8~1.0mm, length be 45~50mm, tensile strength >=
600MPa。
Further, the cement is ordinary portland cement, and the flyash is I grades of flyash, the slag powders
Specific surface area is 450m2/kg。
Further, the modified rubber is obtained to be modified by sol-gel method to rubber powder using sodium metasilicate；
The mass ratio of the sodium metasilicate and rubber powder is (0.06~0.08): 1.
Further, the partial size of the rubber powder is 80~100 mesh.
Further, the water-reducing agent is polycarboxylic acid water reducing agent.
Further, the accelerator is liquid accelerator.
(2) preparation method of a kind of High-geotemperature tunnel high-strength shotcrete, comprising the following steps:
Step 1, sodium metasilicate is added in warm water and is sufficiently dissolved, obtain sodium metasilicate colloidal sol；It is molten that sodium metasilicate is added in rubber powder again
In glue, be stirred 2h, stand 2h to get；
Step 2, cement, slag powders, flyash, sand, coarse aggregate, glass bead, water-reducing agent and water are stirred mixing,
Obtain base-material；Modified rubber, steel fibre and PVA fiber are added in base-material again, strong stirring to material is uniformly mixed, and obtains concrete
First product；
Step 3, after pre-processing to scar, concrete first product is sprayed into pretreated scar by injection pipe,
Concrete first product is mixed to form High-geotemperature tunnel high-strength shotcrete in injection pipe exit and accelerator, and in scar
Concrete support is formed then to conserve using waterglass.
Further, in step 1, the temperature of the warm water is 40~50 DEG C.
Further, in step 3, the pretreatment are as follows: firstly, polishing scar, clean, to increase scar friction
Power；Wet processing of sprinkling water is carried out to the scar after polishing again.
Further, in step 3, the amount of injection of the accelerator account for the concrete first product the amount of injection 1.8~
2.2%.
Compared with prior art, the invention has the benefit that
(1) present invention uses low melting point WATER-SOLUBLE PVA FIBER, so that fiber melts in concrete after reaching fiber melt
Change, forms duct scattering and disappearing convenient for Concrete At High Temperature internal steam, internal vapor pressure of concrete power is reduced, to drop significantly
Low explosion risk；The dissolution of WATER-SOLUBLE PVA FIBER simultaneously, greatly strengthens the inside cohesive strength of concrete, avoids cementing
The cracking in face.
(2) present invention is adulterated using the geminal fibers of PVA fiber and steel fibre, enhances concrete strength in low temperature, in height
Wen Shi, with the dissolution of PVA fiber, Stainless-steel fibre plays a major role, and the PVA dissolved provides bridging for steel fibre and makees
With can play the role of Anticrack, greatly enhance the later strength of concrete.
(3) present invention is formed using modified rubber with glass bead double-doped heat-insulated, keeps the inorganic non-metallic in concrete former
The crystal array entanglement of material destroys heat flow channel, to substantially reduce thermal conductivity.And rubber constituent of the invention and non-straight
Incorporation is connect, but is added by sodium metasilicate is modified, can be very good the modified rubber of sodium metasilicate in conjunction with concrete,
Solve the problems, such as that rubber mixes unevenness away from big bring with concrete difference in specific gravity, so as to avoid rubber type of material addition to mixed
The influence of solidifying soil later strength.
(4) present invention in PVA fiber and modified rubber addition, make concrete when heated water translocation reduce, alleviation
The high temperature obscission of concrete, and coagulation aquation is uniform, later strength loss late reduces.
(5) in High-geotemperature tunnel due to hot environment moisture loss quickly, curing condition is undesirable, conserves in order to prevent
Moisture loss in journey, the present invention are conserved using waterglass, and the calcium hydroxide reaction that waterglass and hydrated cementitious generate generates
Gel of calcium silicate, moisture loss when preventing maintenance.
Specific embodiment
The embodiment of the present invention and effect are described in further detail below.
A kind of High-geotemperature tunnel high-strength shotcrete, raw material specifically: cement is that Lantian of Xi'an Yao cypress cement is limited
P.042.5 grade ordinary portland cement, accelerator are Henan Xi Jian building material Co., Ltd XJ-SN type liquid rapid hardening for company
Agent, water-reducing agent are that Henan Xi Jian building material Co., Ltd wash rice builds -06 type polycarboxylate water-reducer, and flyash is I grades of flyash, mine
The density of ground-slag is 2.88g/m3, 7d vivacity 95%, 28d vivacity 107%, specific surface area 450m2/kg；Sand is river
Sand, fineness modulus 2.7；Steel fibre uses undaform ripple type, specification: diameter 0.95mm, length 50mm, and tensile strength >=
600MPa；PVA fiber is water-soluble explosion-proof PVA fiber；The partial size of glass bead is 1mm, bulk density 100kg/m3；Rubber powder
Granularity is 80 mesh, bulk density 350kg/m3.
Embodiment 1
A kind of preparation method of High-geotemperature tunnel high-strength shotcrete, raw material proportioning are as follows:
1m3Contained material quality is respectively as follows: cement 350kg, flyash 75kg, slag powders 75kg, rubble 483kg, sand
650kg, water 225kg, glass bead 100kg, PVA fiber 1kg, steel fibre 40kg, modified rubber 31.5kg, water-reducing agent 4kg, speed
Solidifying agent 25kg.
Preparation method follows the steps below to implement:
Step 1,6kg sodium metasilicate is added in the warm water that 50L temperature is 40 DEG C and is sufficiently dissolved, obtain sodium metasilicate colloidal sol；Again will
94kg rubber powder is added in sodium metasilicate colloidal sol, is stirred 2h, stands 2h to get modified rubber；
Step 2, cement, slag powders, flyash, sand, coarse aggregate, glass bead, water-reducing agent and water are stirred mixing,
Obtain base-material；Modified rubber, steel fibre, PVA fiber are added in base-material again, strong stirring to material is uniformly mixed, and obtains concrete
First product；
Step 3, it polishes scar, cleans, to increase scar frictional force；Again the scar after polishing sprinkle water wet
Profit processing；Concrete first product is sprayed into pretreated scar by injection pipe, concrete first product is in injection pipe exit
It is mixed to form High-geotemperature tunnel high-strength shotcrete with accelerator, and forms concrete support in scar, then, using water
Glass maintenance；Wherein, the amount of injection of accelerator accounts for the 2% of the concrete first product the amount of injection.
Embodiment 2
A kind of preparation method of High-geotemperature tunnel high-strength shotcrete, raw material proportioning are as follows:
1m3Contained material quality be respectively as follows: cement 315kg, flyash 67.5kg, slag powders 67.5kg, rubble 480kg,
Sand 630kg, water 202.5kg, glass bead 100kg, PVA fiber 1kg, steel fibre 35kg, modified rubber 30kg, water-reducing agent
3.6kg, accelerator 22.5kg.
Preparation method follows the steps below to implement:
Step 1,6kg sodium metasilicate is added in the warm water that 50L temperature is 40 DEG C and is sufficiently dissolved, obtain sodium metasilicate colloidal sol；Again will
94kg rubber powder is added in sodium metasilicate colloidal sol, is stirred 2h, stands 2h to get modified rubber；
Step 2, cement, slag powders, flyash, sand, coarse aggregate, glass bead, water-reducing agent and water are stirred mixing,
Obtain base-material；Modified rubber, steel fibre and PVA fiber are added in base-material again, strong stirring to material is uniformly mixed, and obtains concrete
First product；
Step 3, it polishes scar, cleans, to increase scar frictional force；Again the scar after polishing sprinkle water wet
Profit processing；Concrete first product is sprayed into pretreated scar by injection pipe, concrete first product is in injection pipe exit
It is mixed to form High-geotemperature tunnel high-strength shotcrete with accelerator, and forms concrete support in scar, then, using water
Glass maintenance；Wherein, the amount of injection of accelerator accounts for the 2% of the concrete first product the amount of injection.
Comparative example 1
A kind of preparation method of gunite concrete, raw material proportioning are as follows:
1m3Contained material quality is respectively as follows: cement 350kg, flyash 75kg, slag powders 75kg, rubble 483kg, sand
650kg, water 225kg, glass bead 100kg, PVA fiber 1kg, steel fibre 40kg, water-reducing agent 4kg, accelerator 25kg.
Preparation method follows the steps below to implement:
Step 1, cement, slag powders, flyash, sand, coarse aggregate, glass bead, water-reducing agent and water are stirred mixing,
Obtain base-material；Steel fibre and PVA fiber are added in base-material again, strong stirring to material is uniformly mixed, and obtains concrete first product；
Step 2, it polishes scar, cleans, to increase scar frictional force；Again the scar after polishing sprinkle water wet
Profit processing；Concrete first product is sprayed into pretreated scar by injection pipe, concrete first product is in injection pipe exit
It is mixed to form High-geotemperature tunnel high-strength shotcrete with accelerator, and forms concrete support in scar, then, using water
Glass maintenance；Wherein, the amount of injection of accelerator accounts for the 2% of the concrete first product the amount of injection.
Comparative example 2
A kind of preparation method of gunite concrete, raw material proportioning are as follows:
1m3Contained material quality is respectively as follows: cement 350kg, flyash 75kg, slag powders 75kg, rubble 483kg, sand
650kg, water 225kg, glass bead 100kg, modified rubber 31.5kg, water-reducing agent 4kg, accelerator 25kg.
Preparation method follows the steps below to implement:
Step 1,6kg sodium metasilicate is added in the warm water that 50L temperature is 40 DEG C and is sufficiently dissolved, obtain sodium metasilicate colloidal sol；Again will
94kg rubber powder is added in sodium metasilicate colloidal sol, is stirred 2h, stands 2h to get modified rubber；
Step 2, cement, slag powders, flyash, sand, coarse aggregate, glass bead, water-reducing agent and water are stirred mixing,
Obtain base-material；Modified rubber is added in base-material again, strong stirring to material is uniformly mixed, and obtains concrete first product；
Step 3, it polishes scar, cleans, to increase scar frictional force；Again the scar after polishing sprinkle water wet
Profit processing；Concrete first product is sprayed into pretreated scar by injection pipe, concrete first product is in injection pipe exit
It is mixed to form High-geotemperature tunnel high-strength shotcrete with accelerator, and forms concrete support in scar, then, using water
Glass maintenance；Wherein, the amount of injection of accelerator accounts for the 2% of the concrete first product the amount of injection.
Comparative example 3
1m3Contained material quality is respectively as follows: cement 350kg, flyash 75kg, slag powders 75kg, rubble 483kg, sand
650kg, water 225kg, glass bead 100kg, steel fibre 40kg, modified rubber 31.5kg, water-reducing agent 4kg, accelerator 25kg.
Preparation method follows the steps below to implement:
Step 1,6kg sodium metasilicate is added in the warm water that 50L temperature is 40 DEG C and is sufficiently dissolved, obtain sodium metasilicate colloidal sol；Again will
94kg rubber powder is added in sodium metasilicate colloidal sol, is stirred 2h, stands 2h to get modified rubber；
Step 2, cement, slag powders, flyash, sand, coarse aggregate, glass bead, water-reducing agent and water are stirred mixing,
Obtain base-material；Modified rubber and steel fibre are added in base-material again, strong stirring to material is uniformly mixed, and obtains concrete first product；
Step 3, it polishes scar, cleans, to increase scar frictional force；Again the scar after polishing sprinkle water wet
Profit processing；Concrete first product is sprayed into pretreated scar by injection pipe, concrete first product is in injection pipe exit
It is mixed to form High-geotemperature tunnel high-strength shotcrete with accelerator, and forms concrete support in scar, then, using water
Glass maintenance；Wherein, the amount of injection of accelerator accounts for the 2% of the concrete first product the amount of injection.
Comparative example 4
1m3Contained material quality is respectively as follows: cement 350kg, flyash 75kg, slag powders 75kg, rubble 483kg, sand
650kg, water 225kg, glass bead 100kg, water-reducing agent 4kg, accelerator 25kg.
Preparation method follows the steps below to implement:
Step 1, cement, slag powders, flyash, sand, coarse aggregate, glass bead, water-reducing agent and water are stirred mixing,
Obtain concrete first product；
Step 2, it polishes scar, cleans, to increase scar frictional force；Again the scar after polishing sprinkle water wet
Profit processing；Concrete first product is sprayed into pretreated scar by injection pipe, concrete first product is in injection pipe exit
It is mixed to form High-geotemperature tunnel high-strength shotcrete with accelerator, and forms concrete support in scar, then, using water
Glass maintenance；Wherein, the amount of injection of accelerator accounts for the 2% of the concrete first product the amount of injection.
The concrete support maintenance that embodiment 1 and comparative example 1-4 are sprayed for 24 hours, the concrete sampling of 7 days and 28 days, and
Compression strength, cleavage strength, flexural strength, thermal coefficient and country rock are carried out to the concrete of each curing time respectively and split drawing
Adhesion strength test, wherein compression strength, cleavage strength, flexural strength test process are " common according to GB-T 50081-2002
Mechanical performance of concrete experimental method standard " it executes；Splitting with country rock draws adhesion strength to carry out using direct drawing method, i.e., using drawing
Power device directly carries out drawing to the rock sample for being injected with concrete drilled through.The above test respectively controls specimen temperature 20
DEG C and 80 DEG C at carry out, specimen temperature be 20 DEG C when test result is as follows shown in table 1, the thermal coefficient unit in table 1 be W/
(m.K)。
Mechanical property and heating conduction test result when 1 specimen temperature of table is 20 DEG C
As it can be seen from table 1 the method for the present invention is minimum compared with the thermal coefficient of other comparative examples, illustrate modified rubber of the present invention
Addition can substantially improve the heat-proof quality of concrete.Compression strength of the invention, compared with comparative example 4 as can be seen that steel
Fiber, cleavage strength, flexural strength, is split with crag and adhesion strength is drawn to be above other comparisons at the slave compression strength of PVA fiber
Example, illustrates that concrete comprehensive performance prepared by the present invention is best, the mechanical property of concrete can be greatly improved, especially to coagulation
Later strength (intensity that 28d is) improvement of soil is significant.Compare comparative example 3 and 1 result of embodiment can be seen that the present invention
The addition of middle PVA fiber improves the cleavage strength and adhesion strength of concrete, illustrates that it can increase the cohesive strength of concrete.
Test result is as follows shown in table 2 when specimen temperature is 80 DEG C, and the thermal coefficient unit in table 2 is W/ (m.K).
Mechanical property and heating conduction test result when 2 specimen temperature of table is 80 DEG C
From table 2 it can be seen that the cement plane of only present invention gained concrete does not crack and mixes under 80 DEG C of high-temperature conditions
Solidifying soil is internal not to occur micro-crack or crack yet, illustrates that the cohesive strength of product of the present invention is best, and compared with comparative example 4, this hair
Bright product significantly improves inside concrete cohesive strength and the adhesion strength with country rock.
In summary, room temperature comprehensive mechanical property of the present invention is good, and especially later strength is preferable.And in the case of a high temperature,
Gunite concrete of the invention uses low melting point WATER-SOLUBLE PVA FIBER, so that fiber melts in concrete after reaching fiber melt
Change, forms duct scattering and disappearing convenient for Concrete At High Temperature internal steam, internal vapor pressure of concrete power is reduced, to drop significantly
Low explosion risk；The dissolution of WATER-SOLUBLE PVA FIBER simultaneously, greatly strengthens the inside cohesive strength of concrete, avoids cementing
The cracking in face.The present invention is adulterated using the geminal fibers of PVA fiber and steel fibre, enhances concrete strength in low temperature, in high temperature
When, with the dissolution of PVA fiber, Stainless-steel fibre plays a major role, and the PVA dissolved provides bridge linking effect for steel fibre,
It can play the role of Anticrack, greatly enhance the later strength of concrete.
The interface binding intensity of the present invention and concrete is high, effectively controls the rebound degree of gunite concrete, reduces coagulation
The waste of soil.In short, gunite concrete of the invention, workability, durability, crack resistance, later strength can reach 20-85
The design objective requirement of DEG C heat evil gunite concrete, provides effective way using gunite concrete for the harmful tunnel scene of heat.
Rubber powder in the present invention can be made with waste tire rubber, realize waste utilization, the feature of environmental protection is good.The present invention
In method unless otherwise specified be conventional method, raw material be it is commercially available.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by those familiar with the art, all answers
It is included within the scope of the present invention.Therefore, protection scope of the present invention should be with the scope of protection of the claims
It is quasi-.
Claims (10)
1. a kind of High-geotemperature tunnel high-strength shotcrete, which is characterized in that include following raw material components: cementitious material, sand,
Coarse aggregate, glass bead, PVA fiber, steel fibre, modified rubber, water-reducing agent, accelerator and water；Wherein, the cementitious material is
Cement, flyash and slag powders.
2. High-geotemperature tunnel according to claim 1 high-strength shotcrete, which is characterized in that the dosage of the raw material
Are as follows: 1m3Contained material quality is respectively as follows: 450~500kg of cementitious material, 600~650kg of sand, 460~490kg of coarse aggregate, glass
Changing 100~120kg of microballon, 1~2kg of PVA fiber, 35~40kg of steel fibre, 28~32kg of modified rubber, water-reducing agent quality is glue
Gel material 0.8%, 5% that accelerator quality is cementitious material, the mass ratio of water and cementitious material is 0.45；Wherein, described
The quality accounting of each raw material in cementitious material are as follows: cement 70%, flyash 15%, slag powders 15%.
3. High-geotemperature tunnel according to claim 1 high-strength shotcrete, which is characterized in that the modified rubber is
By sol-gel method rubber powder is modified using sodium metasilicate obtained；The mass ratio of the sodium metasilicate and rubber powder is
(0.06~0.08): 1.
4. High-geotemperature tunnel according to claim 1 high-strength shotcrete, which is characterized in that the cement is common
Portland cement, the flyash are I grades of flyash, and the specific surface area of the slag powders is 450m2/kg。
5. High-geotemperature tunnel according to claim 1 high-strength shotcrete, which is characterized in that the PVA fiber
70~80 DEG C of fusing point.
6. High-geotemperature tunnel according to claim 1 high-strength shotcrete, which is characterized in that the steel fibre it is straight
Diameter is 0.8~1.0mm, and length is 45~50mm, tensile strength >=600MPa.
7. a kind of preparation method of High-geotemperature tunnel high-strength shotcrete, which comprises the following steps:
Step 1, sodium metasilicate is added in warm water and is sufficiently dissolved, obtain sodium metasilicate colloidal sol；Rubber powder is added in sodium metasilicate colloidal sol again,
Be stirred 2h, stand 2h to get；
Step 2, cement, slag powders, flyash, sand, coarse aggregate, glass bead, water-reducing agent and water are stirred mixing, obtain base
Material；Modified rubber, steel fibre and PVA fiber are added in base-material again, strong stirring to material is uniformly mixed, at the beginning of obtaining concrete
Product；
Step 3, after pre-processing to scar, concrete first product is sprayed into pretreated scar, coagulation by injection pipe
Native first product is mixed to form High-geotemperature tunnel high-strength shotcrete in injection pipe exit and accelerator, and is formed in scar
Concrete support is then conserved using waterglass.
8. the preparation method of High-geotemperature tunnel according to claim 7 high-strength shotcrete, which is characterized in that step
In 1, the temperature of the warm water is 40~50 DEG C.
9. the preparation method of High-geotemperature tunnel according to claim 7 high-strength shotcrete, which is characterized in that step
In 3, the pretreatment are as follows: firstly, polishing scar, clean, to increase scar frictional force；Again to the scar after polishing into
The wet processing of row watering.
10. the preparation method of High-geotemperature tunnel according to claim 7 high-strength shotcrete, which is characterized in that step
In rapid 3, the amount of injection of the accelerator accounts for the 1.8~2.2% of the concrete first product the amount of injection.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110981345A (en) * | 2019-12-17 | 2020-04-10 | 广东省水利水电第三工程局有限公司 | Sprayed concrete and construction method thereof |
| CN111205045A (en) * | 2020-01-13 | 2020-05-29 | 西南交通大学 | Special sprayed concrete material for tunnel high-ground-temperature dry-heat environment |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102674882A (en) * | 2012-06-01 | 2012-09-19 | 白国全 | Self-temperature-control phase change heat storage energy-saving material |
| CN105060836A (en) * | 2015-08-21 | 2015-11-18 | 成都理工大学 | High-ground-temperature tunnel heat insulation lining concrete and preparation method thereof |
| CN105272012A (en) * | 2015-11-02 | 2016-01-27 | 成都理工大学 | Concrete for high-ground stress and high-ground temperature tunnel excavation primary support |
| CN105367026A (en) * | 2015-12-10 | 2016-03-02 | 张进 | High strength concrete and preparation method thereof |
| CN107721317A (en) * | 2017-11-15 | 2018-02-23 | 东南大学 | Basalt and polyvinyl alcohol mix fiber concrete and preparation method |
| KR101923493B1 (en) * | 2018-05-18 | 2018-11-29 | 씨엘엠테크(주) | Mortar Composition with air-entraining agent for Concrete Repair and Concrete Repair Method Using the same |
-
2019
- 2019-09-20 CN CN201910892544.6A patent/CN110510954B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102674882A (en) * | 2012-06-01 | 2012-09-19 | 白国全 | Self-temperature-control phase change heat storage energy-saving material |
| CN105060836A (en) * | 2015-08-21 | 2015-11-18 | 成都理工大学 | High-ground-temperature tunnel heat insulation lining concrete and preparation method thereof |
| CN105272012A (en) * | 2015-11-02 | 2016-01-27 | 成都理工大学 | Concrete for high-ground stress and high-ground temperature tunnel excavation primary support |
| CN105367026A (en) * | 2015-12-10 | 2016-03-02 | 张进 | High strength concrete and preparation method thereof |
| CN107721317A (en) * | 2017-11-15 | 2018-02-23 | 东南大学 | Basalt and polyvinyl alcohol mix fiber concrete and preparation method |
| KR101923493B1 (en) * | 2018-05-18 | 2018-11-29 | 씨엘엠테크(주) | Mortar Composition with air-entraining agent for Concrete Repair and Concrete Repair Method Using the same |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110981345A (en) * | 2019-12-17 | 2020-04-10 | 广东省水利水电第三工程局有限公司 | Sprayed concrete and construction method thereof |
| CN111205045A (en) * | 2020-01-13 | 2020-05-29 | 西南交通大学 | Special sprayed concrete material for tunnel high-ground-temperature dry-heat environment |
| CN111205045B (en) * | 2020-01-13 | 2021-03-09 | 西南交通大学 | Special sprayed concrete material for tunnel high-ground-temperature dry-heat environment |
| CN111606611A (en) * | 2020-06-11 | 2020-09-01 | 陕西拉发纪新材料科技有限公司 | Inorganic high-strength corrosion-resistant spraying material for coal mine tunnel and coating construction process thereof |
| CN113149555A (en) * | 2021-04-21 | 2021-07-23 | 河南省宜居建材科技有限公司 | Sprayed concrete for roadway |
| CN114263479A (en) * | 2021-12-27 | 2022-04-01 | 中国建筑土木建设有限公司 | Device and method for controlling rebound rate of tunnel shotcrete |
| CN114573285A (en) * | 2022-02-22 | 2022-06-03 | 兴宁市龙江建材实业有限公司 | Preparation method of polymer cement mortar with high crack resistance |
| CN116102301A (en) * | 2023-02-07 | 2023-05-12 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Heat-insulating high-toughness carbonic acid tunnel slag geopolymer shotcrete and preparation method thereof |
| CN116102301B (en) * | 2023-02-07 | 2024-05-28 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Heat-insulating high-toughness carbonic acid tunnel slag geopolymer shotcrete and preparation method thereof |
| CN116177958A (en) * | 2023-02-23 | 2023-05-30 | 上海兆捷实业发展有限公司 | Anti-cracking concrete and preparation method thereof |
| CN116283145A (en) * | 2023-03-14 | 2023-06-23 | 西南交通大学 | High-strength and high-toughness heat-insulation functional sprayed concrete for high-temperature hot water tunnel |
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