CN109608140A - A kind of tunnel injection environmentally friendly cement concrete and its preparation and application - Google Patents
A kind of tunnel injection environmentally friendly cement concrete and its preparation and application Download PDFInfo
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- CN109608140A CN109608140A CN201910062377.2A CN201910062377A CN109608140A CN 109608140 A CN109608140 A CN 109608140A CN 201910062377 A CN201910062377 A CN 201910062377A CN 109608140 A CN109608140 A CN 109608140A
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- environmentally friendly
- friendly cement
- concrete
- tunnel
- cement concrete
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Classifications
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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
- C04B28/04—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
- 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
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention belongs to concrete material fields, and in particular to a kind of tunnel injection environmentally friendly cement concrete and its preparation and application.Tunnel of the invention sprays environmentally friendly cement concrete, is mainly made of the raw material of following mass ratio: environmentally friendly cement: sand: stone: PTB lotion: accelerator: water=6.72~7.92:6.68~7.32:13.36~14.64:0~0.44:0.20~0.29:1.44~1.76.Environmentally friendly cement is by Na2SO4, ordinary portland cement, slag and flyash composition, mass ratio Na2SO4: ordinary portland cement: slag: flyash=0.12~0.24:1.00:3.84~4.64:1.76~2.04.Tunnel injection environmentally friendly cement concrete of the invention has many advantages, such as that Workable, setting time are short, early strength is high, fire line is good, durability is good, toughness is high, the at low cost and feature of environmental protection is strong, has preferable market application prospect.
Description
Technical field
The invention belongs to concrete material fields, and in particular to a kind of tunnel injection environmentally friendly cement concrete and its preparation and
Application method.
Background technique
Gunite concrete can be sprayed at using Spray Gun Of The Pressure by tunnel liner etc..Gunite concrete has construction is simple fast
Prompt, the advantages that early strength is high, self compacting ability is good, with relatively broad in the limited engineering of Tunnel Engineering and execution conditions.
But that there are workabilities is poor, setting time is long, bad adhesion, brittleness for ordinary crossing jeting cement concrete used at present
The disadvantages of high and later period is also easy to produce cracking, has seriously affected the application of tunnel jeting cement concrete.
Currently, the domestic multiple patents in relation to gunite concrete applied, 108129095 A patent of CN disclose one
Kind gunite concrete, the invention is mainly using 2.4 basalt fibre of addition and 121 silicon ash system in common gunite concrete
At to improve its cleavage strength and adhesive strength, higher cost, adhesion strength improves smaller.The present invention uses environmentally friendly cement
(there is certain active slag and/or the resulting cementitious material of flyash using neutral sodium-salt or alkali-activator excitation) coagulation
Soil is added PTB lotion and mixes, and adhesion strength significantly improves, and cost is relatively low, and largely using solid waste coal ash and
Slag replaces cement, and environment protecting is obvious.108546025 A patent of CN disclose a kind of high tenacity gunite concrete and its
Production method, the invention is mainly attapulgite modified using addition and nano-rubber powder improves its toughness, needs by complexity
The processes such as dispersion, water-bath and purification obtain attapulgite modified.Invention operation is extremely complex, at high cost, is unfavorable for industrialization.
The present invention, which only needs PTB lotion is first incorporated into environmentally friendly cement concrete, to stir evenly, and can be prepared by Workable, setting time
Short, early strength is high and the tunnel of high tenacity sprays environmentally friendly cement concrete, cost can be greatly reduced, and easy to operate, industry
Change has a extensive future.The country's only patent of invention using PTB lotion, i.e. 101691290 B patent of CN disclose PTB and add
Gas concrete block masonry and decorative mortar and its application method.But the patent only builds PTB emulsion applications in air entrained concrete
Block is built with decorative mortar, mainly utilizes its waterproof and caking property.The present invention utilizes the water reducing ability of PTB lotion and flexibility etc.
Characteristic improves its sprayable property and durability by PTB emulsion applications in tunnel injection environmentally friendly cement concrete.
Summary of the invention
For defect present in above-mentioned background technique and problem, the present invention provides a kind of tunnel injection environmentally friendly cement is mixed
Solidifying soil and its preparation and application.
To achieve the above object, the present invention adopts the following technical scheme:
Tunnel injection environmentally friendly cement concrete is made of environmentally friendly cement, sand, stone, PTB lotion, accelerator and water, each group sub-prime
Measure ratio are as follows: environmentally friendly cement: sand: stone: PTB lotion: accelerator: water=6.72~7.92:6.68~7.32:13.36~14.64:0
~0.44:0.20~0.29:1.44~1.76.
Environmentally friendly cement is by Na2SO4, ordinary portland cement, slag and flyash composition, mass ratio Na2SO4: it is common
Portland cement: slag: flyash=0.12~0.24:1.00:3.84~4.64:1.76~2.04.
Further, the Na2SO4To analyze pure (AR) anhydrous sodium sulfate.
Further, the ordinary portland cement includes P.O 32.5 and P.O 42.5.
Further, the slag is S95 grades of ground granulated blast furnace slags.
Further, the flyash is II grades of flyash of power plant's solid waste.
Further, the PTB lotion is ethylene-vinyl chloride-vinyl acetate product, white emulsion shape.Its physical property
Index is viscosity: 80~120 mPa.s, solid content: 52 ± 1wt%, specific gravity: 1.1, pH value: 7~9.PTB lotion has fabulous
Waterproofness, workability and flexibility.
Further, the accelerator is the inorganic salts additive that concrete can be made to condense hardening rapidly, particular type
It number include I type of Red Star, 7 II type of Red Star, 782 type of Red Star, any one in 8604 type of Red Star.
Further, dominant mechanism are as follows:
(1) since the activity of flyash and slag is lower, aquation is slow, used in match ratio a small amount of ordinary portland cement for
Tunnel gunite concrete provides early strength, the Ca (OH) then generated by hydrated reaction of cement2And Na2SO4Exciting agent reaction life
Come the lower flyash of stimulating activity and slag at a large amount of NaOH.With increasing for system NaOH, alkalinity enhancing, this makes flyash
Depolymerization and polycondensation are generated with Si-O the and Al-O tetrahedron inside slag, so that is dissolved out inside flyash and slag has chemistry
Active Si matter ingredient and Ca (OH)2And water fast reaction generates the hydrated calcium silicate (C-S-H) with gelatification, is tunnel
The growth of road gunite concrete later strength provides safeguard.
(2) PTB lotion has water-reducing effect, so that tunnel gunite concrete possesses preferable flowing in course of injection
Property.PTB lotion has fabulous caking property, waterproofness and flexibility.When PTB lotion is incorporated into tunnel injection environmentally friendly cement coagulation
When in soil, tunnel sprays environmentally friendly cement concrete hydrating reaction consumption water, generates the hydrated products such as C-S-H, makes tunnel sparge ring
Being retained cement concrete has certain mechanical property.In hydration process, in the case of concrete pore moisture is reduced, PTB lotion
In tunnel, injection environmentally friendly cement inside concrete forms polymer mesh space structure, and which suppress tunnel injection environmentally friendly cement is mixed
The development of the solidifying internal microcrack of soil makes environmentally friendly cement concrete have preferable flexibility and mechanical property (adhesion strength and anti-
Compressive Strength etc.) and durability.
(3) environmentally friendly cement concrete has many advantages, such as that early strength is high, setting time is short.Accelerator is in concrete ejection
Incorporation can make concrete condense hardening rapidly, hence it is evident that shorten its setting time, avoid generating and falling off after spraying.By environmentally friendly cement and
Both accelerators combine, and can reduce accelerator dosage, save material cost, improve construction efficiency, guarantee construction quality.
Further, preparation process are as follows:
(1) it measures: measuring each composition material respectively according to the above ratio；
(2) sand, stone, flyash, slag and ordinary portland cement mix siccative: are poured into dry mixing 2~3 minutes in blender；
(3) additional agent solution is prepared: by Na2SO4, PTB lotion and accelerator be dissolved in water, stir 2~3 minutes；
Further, application method: being transported to scene with additional agent solution for the good siccative of premixing and spray, additional agent solution
It must be added in spraying machine feeding.
Compared with existing tunnel sprays environmentally friendly cement concrete technology, the invention has the following advantages that
(1) PTB lotion has water-reducing effect, and has fabulous caking property and outstanding flexibility, is a kind of organic binder,
It generates intensity in dehydration；Environmentally friendly cement is a kind of inorganic binder, needs to consume water when generating intensity.It will be inorganic and have
Machine binder combines, and learns from other's strong points to offset one's weaknesses, and makes to be added to PTB lotion tunnel injection environmentally friendly cement concrete with work well
Property, toughness, intensity and durability.
(2) since the hydrated product of environmentally friendly cement is mainly based on C-S-H, Ca (OH) 2 contents are seldom, therefore tunnel sprays
Environmentally friendly cement concrete has preferable fire resistance.Due to environmentally friendly cement adhesive property with higher, and PTB lotion can be with
The larger caking property for improving concrete, therefore injection environmentally friendly cement concrete springback rate in tunnel is low, with tunnel basal plane adhesion strength
Height, it is not easily to fall off under various shock conditions.
(3) environmentally friendly cement early strength is high, setting time is short.On the other hand, accelerator is mixed in gunite concrete,
Setting time can be shortened.The feature that environmentally friendly cement setting time is short is made full use of, can be subtracted in the case where meeting jetting performance
The dosage of few accelerator.In addition, environmentally friendly cement largely consumes solid waste coal ash and slag, not only environmental benefit is obvious,
And the cost of tunnel gunite concrete can be reduced.
(4) it often will appear leakage phenomenon in tunnel, PTB lotion has fabulous waterproofness, PTB lotion is incorporated into tunnel
Road sprays in environmentally friendly cement concrete, can make it have higher waterproof performance.
Specific embodiment
The present invention is to provide a kind of tunnel injection environmentally friendly cement concrete and its preparation and application.Tunnel injection
Environmentally friendly cement concrete is made of environmentally friendly cement, sand, stone, PTB lotion, accelerator and water, each component mass ratio are as follows: environment-protective water
Mud: sand: stone: PTB lotion: accelerator: water=6.72~7.92:6.68~7.32:13.36~14.64:0~0.44:0.20~
0.29:1.44~1.76.Environmentally friendly cement is by Na2SO4, ordinary portland cement, slag and flyash composition, mass ratio is
Na2SO4: ordinary portland cement: slag: flyash=0.12~0.24:1.00:3.84~4.64:1.76~2.04.
Spray environmentally friendly cement concrete, preparation process in tunnel of the present invention are as follows:
(1) it measures: measuring each composition material respectively according to the above ratio；
(2) sand, stone, flyash, slag and ordinary portland cement mix siccative: are poured into dry mixing 2~3 minutes in blender；
(3) additional agent solution is prepared: by Na2SO4, PTB lotion and accelerator be dissolved in water, stir 2~3 minutes；
Spray environmentally friendly cement concrete, application method are as follows: be transported to the good siccative of premixing with additional agent solution in tunnel of the present invention
Scene is sprayed, and additional agent solution must be added in spraying machine feeding.
Embodiment 1
Tunnel of the invention sprays environmentally friendly cement concrete, is mainly made of the raw material of following mass ratio: environmentally friendly cement: sand: stone:
PTB lotion: I type accelerator of Red Star: water=6.72:6.68:13.36:0:0.20:1.44.Wherein environmentally friendly cement is by Na2SO4, it is common
Portland cement, slag and flyash composition, mass ratio Na2SO4: ordinary portland cement: slag: flyash=0.12:
1.00:3.84:1.76.
The specific steps of injection environmentally friendly cement preparation method of concrete in tunnel of the present invention are as follows:
(1) it measures: measuring each composition material respectively according to the above ratio；
(2) sand, stone, flyash, slag and ordinary portland cement mix siccative: are poured into dry mixing 2~3 minutes in blender；
(3) additional agent solution is prepared: by Na2SO4, PTB lotion and I type accelerator of Red Star be dissolved in water, stir 2~3 minutes；
Tunnel of the present invention injection environmentally friendly cement concrete ejection work: by the good siccative of premixing and additional agent solution be transported to scene into
Row injection, additional agent solution must be added in spraying machine feeding.
The adhesion strength of initial set and final setting time, tunnel environment-friendly concrete to environmentally friendly cement net slurry, compression strength and anti-
Folding intensity is measured, presetting period 3min, the final setting time 11min of net slurry；The adhesion strength of tunnel environment-friendly concrete is
1.5MPa, compression strength 45.8MPa, flexural strength 5.5MPa.Meet " rock soil anchor and concrete spraying support engineering technology rule
Model " (GB 50086-2015) requirement.
Embodiment 2
Tunnel of the invention sprays environmentally friendly cement concrete, is mainly made of the raw material of following mass ratio: environmentally friendly cement: sand: stone:
PTB lotion: 782 type accelerator of Red Star: water=7.32:7.02:14.11:0.40:0.25:1.61.Environmentally friendly cement is by Na2SO4, it is general
Logical portland cement, slag and flyash composition, mass ratio Na2SO4: ordinary portland cement: slag: flyash=
0.18:1.00:4.24:1.90.
The specific steps of injection environmentally friendly cement preparation method of concrete in tunnel of the present invention are as follows:
(1) it measures: measuring each composition material respectively according to the above ratio；
(2) sand, stone, flyash, slag and ordinary portland cement mix siccative: are poured into dry mixing 2~3 minutes in blender；
(3) additional agent solution is prepared: by Na2SO4, PTB lotion and 782 type accelerator of Red Star be dissolved in water, stir 2~3 points
Clock；
Tunnel of the present invention injection environmentally friendly cement concrete ejection work: by the good siccative of premixing and additional agent solution be transported to scene into
Row injection, additional agent solution must be added in spraying machine feeding.
The adhesion strength of initial set and final setting time, tunnel environment-friendly concrete to environmentally friendly cement net slurry, compression strength and anti-
Folding intensity is measured, presetting period 3min, the final setting time 9min of net slurry；The adhesion strength of tunnel environment-friendly concrete is
1.8MPa, compression strength 44.7MPa, flexural strength 6.3MPa.Meet " rock soil anchor and concrete spraying support engineering technology rule
Model " (GB 50086-2015) requirement.
Embodiment 3
Tunnel of the invention sprays environmentally friendly cement concrete, is mainly made of the raw material of following mass ratio: environmentally friendly cement: sand: stone:
PTB lotion: 8604 type accelerator of Red Star: water=7.92:7.32:14.64:0.44:0.29:1.76.Environmentally friendly cement is by Na2SO4, it is general
Logical portland cement, slag and flyash composition, mass ratio Na2SO4: ordinary portland cement: slag: flyash=
0.24:1.00:4.64:2.04.
The specific steps of injection environmentally friendly cement preparation method of concrete in tunnel of the present invention are as follows:
(1) it measures: measuring each composition material respectively according to the above ratio；
(2) sand, stone, flyash, slag and ordinary portland cement mix siccative: are poured into dry mixing 2~3 minutes in blender；
(3) additional agent solution is prepared: by Na2SO4, PTB lotion and 8604 type accelerator of Red Star be dissolved in water, stir 2~3 points
Clock；
Tunnel of the present invention injection environmentally friendly cement concrete ejection work: by the good siccative of premixing and additional agent solution be transported to scene into
Row injection, additional agent solution must be added in spraying machine feeding.
The adhesion strength of initial set and final setting time, tunnel environment-friendly concrete to environmentally friendly cement net slurry, compression strength and anti-
Folding intensity is measured, presetting period 2min, the final setting time 6min of net slurry；The adhesion strength of tunnel environment-friendly concrete is
2.0MPa, compression strength 43.1MPa, flexural strength 6.6MPa.Meet " rock soil anchor and concrete spraying support engineering technology rule
Model " (GB 50086-2015) requirement.
The above, only presently preferred embodiments of the present invention, but scope of protection of the present invention is not limited thereto, it is any ripe
Know those skilled in the art in the technical scope disclosed by the present invention, it is all done according to scope of the present invention patent it is equal
Deng variation and modification, it is all covered by the present invention.
Claims (10)
1. a kind of tunnel sprays environmentally friendly cement concrete, it is characterised in that: spray environmentally friendly cement concrete by environment-protective water in the tunnel
Mud, sand, stone, PTB lotion, accelerator and water composition, each component mass ratio are as follows: environmentally friendly cement: sand: stone: PTB lotion: accelerator:
Water=6.72~7.92:6.68~7.32:13.36~14.64:0~0.44:0.20~0.29:1.44~1.76.
2. tunnel according to claim 1 sprays environmentally friendly cement concrete, it is characterised in that: the environmentally friendly cement be by
Na2SO4, ordinary portland cement, slag and flyash composition, mass ratio Na2SO4: ordinary portland cement: slag: powder
Coal ash=0.12~0.24:1.00:3.84~4.64:1.76~2.04.
3. tunnel according to claim 2 sprays environmentally friendly cement concrete, it is characterised in that: the Na2SO4For analysis
Pure AR anhydrous sodium sulfate.
4. tunnel according to claim 2 sprays environmentally friendly cement concrete, it is characterised in that: the normal silicate water
Mud drum includes P.O 32.5 and P.O 42.5.
5. tunnel according to claim 2 sprays environmentally friendly cement concrete, it is characterised in that: the slag is S95 grades
Ground granulated blast furnace slag.
6. tunnel according to claim 2 sprays environmentally friendly cement concrete, it is characterised in that: the flyash is power plant
II grades of flyash of solid waste.
7. tunnel according to claim 1 sprays environmentally friendly cement concrete, it is characterised in that: the PTB lotion is second
Alkene-vinyl chloride-ethylene ester product, white emulsion shape；Its physical performance index is viscosity: 80~120 mPa.s, solid content:
52 ± 1wt%, specific gravity: 1.1, pH value: 7~9.
8. tunnel according to claim 1 sprays environmentally friendly cement concrete, it is characterised in that: the accelerator is that can make
Concrete condenses rapidly the inorganic salts additive of hardening, and concrete model includes I type of Red Star, 7 II type of Red Star, 782 type of Red Star, red
Any one in 8604 type of star.
9. a kind of prepare the method such as tunnel according to claim 1-8 injection environmentally friendly cement concrete, spy
Sign is: specific steps are as follows:
(1) it measures: measuring each composition material respectively according to the above ratio；
(2) sand, stone, flyash, slag and ordinary portland cement mix siccative: are poured into dry mixing 2~3 minutes in blender；
(3) additional agent solution is prepared: by Na2SO4, PTB lotion and accelerator be dissolved in water, stir 2~3 minutes.
10. the application method of -8 any tunnel injection environmentally friendly cement concrete according to claim 1, it is characterised in that:
The good siccative of premixing is transported to scene with additional agent solution to spray, additional agent solution must be added in spraying machine feeding.
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Cited By (3)
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| CN110698164A (en) * | 2019-09-16 | 2020-01-17 | 福州市宇心建材科技有限公司 | Concrete layer repairing material for steel-concrete composite beam and preparation method thereof |
| CN112047666A (en) * | 2020-09-03 | 2020-12-08 | 中国核工业中原建设有限公司 | Alkali-activated blast furnace ferronickel slag sprayed concrete |
| CN115746599A (en) * | 2022-12-21 | 2023-03-07 | 山西潞安晋安矿业工程有限责任公司 | Bi-component inorganic thin spraying material for coal mine |
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| 吕官记: ""防水透气型加气混凝上砌块界而剂的研究"", 《中国优秀硕士学位论文全文数据库 工程科技II辑》 * |
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| CN110698164A (en) * | 2019-09-16 | 2020-01-17 | 福州市宇心建材科技有限公司 | Concrete layer repairing material for steel-concrete composite beam and preparation method thereof |
| CN112047666A (en) * | 2020-09-03 | 2020-12-08 | 中国核工业中原建设有限公司 | Alkali-activated blast furnace ferronickel slag sprayed concrete |
| CN112047666B (en) * | 2020-09-03 | 2021-10-29 | 中国核工业中原建设有限公司 | Alkali-activated blast furnace ferronickel slag sprayed concrete |
| CN115746599A (en) * | 2022-12-21 | 2023-03-07 | 山西潞安晋安矿业工程有限责任公司 | Bi-component inorganic thin spraying material for coal mine |
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Application publication date: 20190412 |