CN105060836A - High-ground-temperature tunnel heat insulation lining concrete and preparation method thereof - Google Patents
High-ground-temperature tunnel heat insulation lining concrete and preparation method thereof Download PDFInfo
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- CN105060836A CN105060836A CN201510520397.1A CN201510520397A CN105060836A CN 105060836 A CN105060836 A CN 105060836A CN 201510520397 A CN201510520397 A CN 201510520397A CN 105060836 A CN105060836 A CN 105060836A
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Abstract
The invention belongs to the technical field of civil engineering materials, and particularly relates to high-ground-temperature tunnel heat insulation lining concrete. The concrete of 1 m<3> includes, by mass, 300 kg to 380 kg of cement, 850 kg to 1,000 kg of coarse aggregate, 450 kg to 550 kg of sand, 200 kg to 220 kg of water glass, 8 kg to 12 kg of glass beads, 50 kg to 150 kg of second-grade fly ash, 40 kg to 80 kg of steel fibers, 3 kg to 5 kg of acrylamide and 2 kg to 3 kg of polycarboxylic acid high-performance water reducing agents. According to the high-ground-temperature tunnel heat insulation lining concrete, surrounding rock supporting and heat insulation are combined, the difficulty of tunnel construction is reduced, good heat insulation performance is achieved in the high-ground-temperature environment, meanwhile, strength cannot be lowered, the hardened concrete is higher in strength, the strength requirement of the lining concrete can be met, and the mechanical property of the concrete at high ground temperature is improved. Meanwhile, the concrete has good water and cracking preventing performance.
Description
Technical field
The invention belongs to civil engineering material neck technology territory, be specifically related to a kind of High-geotemperature tunnel heat shield liner building concrete and preparation method thereof.
Background technology
At present, along with the construction of highway in China and railway, a lot of engineering will be passed through mountain area and be built deep-lying long tunnels engineering, and these engineerings are inevitably by high temperature height thermally section.For ensureing the operation in tunnel, High-geotemperature location, bring huge challenge to the construction in High-geotemperature location.
In high temperature height thermally section, the initial temperature of country rock is very high, the highlyest can, up to 100 DEG C, liner structure concrete is in high temperature high thermal environment.In high temperature environments, concrete initial stage hydration rate improves greatly, and the hydration heat in concrete has little time to leave, in advance, early strength is higher, and hydrated product thing changes mutually for initial set and final setting time, concrete later strength reduces, and does not reach the requirement of strength of liner structure.In addition, due to hot environment, the surfaces externally and internally of lining concrete produces temperature head, and produce temperature additional stress, make concrete cracking, concrete weather resistance reduces greatly.In height geothermally section, frequently have high temperature fissure water and flow out, erosion action is produced to concrete, further the impact concrete life-span.
For solving the problem that above-mentioned High-geotemperature produces, some scholars start with from concrete structure, add one layer of heat preservation thermofin in the early stage between supporting and liner structure, thus reach heat insulation object, ensure the concrete intensity of secondary lining.Tunnel lining bilayer structure concrete under a kind of underground heat eating condition disclosed in the patent No. 201220214957.2, its construction is carried out in two steps, first construction heat-insulating layer, then constructing structure layer, and operational procedure is slightly aobvious complicated; The anti-heat release liner structure of High-geotemperature speed disclosed in the patent No. 201110148520.3, lagging material is sprayed in preliminary bracing, thermofin and the heat insulation composite bed of guarded drainage is also provided with in the early stage between supporting and secondary lining, although this structure has good anti-exothermal effect, constructing operation too complex.
Summary of the invention
For above-mentioned technical problem, the invention provides a kind of concrete, reach heat insulation, simple High-geotemperature tunnel heat shield liner building concrete of constructing.Concrete technical scheme is:
High-geotemperature tunnel heat shield liner building concrete, 1m
3contained raw materials quality is: cement 300 ~ 380kg, coarse aggregate 850 ~ 1000kg, sand 450 ~ 550kg, water glass 200 ~ 220kg, glass bead 8 ~ 12kg, II grade of flyash 50 ~ 150kg, steel fiber 40 ~ 80kg, the third solidifying 3 ~ 5kg, high performance water reducing agent of polyocarboxy acid 2 ~ 3kg.
Described cement is ordinary Portland cement, and model is PO42.5.
Described coarse aggregate is the rubble of continuous grading, and particle diameter is 5 ~ 31.5mm.
Described glass bead is expanded and vitrified small ball, and specification is 80 ~ 120kg/m
3, size is 1mm ~ 3mm, and thermal conductivity is 0.048 ~ 0.070/W/ (mK).Glass bead compensate for by many defects and deficiency in Conventional insulation, and the product later stage does not produce hollowing cracking, and fire resistance is good, and intensity is high, can make up concrete preferably and reduce in High-geotemperature Under Concrete intensity.
Described flyash adopts II grade of flyash, gelling material can be made by Substitute For Partial ordinary Portland cement, improve the workability of concrete mix, reduce concrete contraction and cracking, reduce the hydration heat in concrete pouring, the later strength of compensating concrete well.
The incorporation of steel fiber and concrete strength grade need make change according to requiring stressed difference in engineering.
Described water glass is water glass (Na
2onSiO
2) the aqueous solution, as binding agent, improve concrete intensity, simultaneously the thermotolerance of water glass is better.
Described third is solidifying as water-proof and anti-corrosive material, effectively can prevent and treat High-geotemperature location GEOTHERMAL WATER to the erosion of lining concrete, ensure that concrete weather resistance.
Water-cement ratio is reduced with II level flyash excessive replacement and high efficiency water reducing agent dual mixing technology, thus low strong, the large fluidised form of balance two lining water-proof concrete and the contradiction of impermeability.
The preparation method of above-mentioned heat insulating concrete, comprises the following steps:
(1) prepare starting material, and check all raw-material quality;
(2) cement, sand, II grade of flyash, glass bead, third solidifying, high performance water reducing agent of polyocarboxy acid are mixed forced mixer and stir, at the uniform velocity stir 1.5min with suitable speed, add water glass while stirring and stir.
(3) coarse aggregate and steel fiber are mixed in stirrer, at the uniform velocity stir 2min with suitable speed;
(4) by obtained concreting in lifts, building is highly 40cm, and maintenance under suitable conditions.
High-geotemperature tunnel provided by the invention heat shield liner building concrete, surrounding rock supporting with heat insulationly to combine, decrease the difficulty of constructing tunnel, under High-geotemperature environment, have good heat-proof quality, intensity can not reduce simultaneously, and the concrete strength after sclerosis is higher, the requirement of strength of lining concrete can be reached, improve the mechanical property under concrete High-geotemperature condition; This concrete has good waterproof, crack resistence performance simultaneously.
Embodiment
Below in conjunction with embodiment and comparative example, the specific embodiment of the present invention is illustrated.
Embodiment 1
High-geotemperature tunnel heat shield liner building concrete, 1m
3contained raw materials quality is as follows:
Cement 345kg, coarse aggregate 910kg, sand 478kg, water glass 200kg, glass bead 10kg, II grade of flyash 100kg, steel fiber 80kg, the third solidifying 4kg, high performance water reducing agent of polyocarboxy acid 3kg.
The preparation method of above-mentioned heat resistance concrete, comprises the following steps:
(1) prepare starting material, and check all raw-material quality;
(2) cement, sand, II grade of flyash, glass bead, third solidifying, high performance water reducing agent of polyocarboxy acid are mixed forced mixer and stir, at the uniform velocity stir 1.5min with suitable speed, add water glass while stirring and stir.
(3) coarse aggregate and steel fiber are mixed in stirrer, at the uniform velocity stir 2min;
(4) by obtained concreting in lifts, building is highly 40cm, and maintenance.
After concrete pouring 28d, recording its ultimate compression strength is 37.8MPa, and leakless, waterproof effect is better.
To obtained concrete, one is placed on High-geotemperature geothermal environment, and analog temperature is respectively 30 DEG C, 40 DEG C, 50 DEG C, 60 DEG C, 80 DEG C, simultaneously with GEOTHERMAL WATER, tests its effect of heat insulation, ultimate compression strength, cracking situation, waterproof effect.
Test result is: (1) effect of heat insulation: the temperature variation of concrete opposite side is little, and along with analog temperature raises, the temperature of opposite side is in rising trend, but the slope risen is too little.(2) ultimate compression strength: through compression experiment test, concrete intensity is respectively 37.3MPa, 36.6MPa, 35.8MPa, 34.7MPa, 33.1MPa, can meet concrete ultimate compression strength requirement.(3) ftracture situation: the essentially no cracking of concrete.(4) waterproof effect: through observing, the anhydrous intrusion in concrete inside.
Embodiment 2
High-geotemperature tunnel heat shield liner building concrete, 1m
3contained raw materials quality is as follows:
Cement 300kg, coarse aggregate 1000kg, sand 450kg, water glass 220kg, glass bead 8kg, II grade of flyash 50kg, steel fiber 40kg, the third solidifying 5kg, high performance water reducing agent of polyocarboxy acid 2kg.
The preparation method of above-mentioned heat resistance concrete, comprises the following steps:
(1) prepare starting material, and check all raw-material quality;
(2) cement, sand, II grade of flyash, glass bead, third solidifying, high performance water reducing agent of polyocarboxy acid are mixed forced mixer and stir, at the uniform velocity stir 1.5min with suitable speed, add water glass while stirring and stir.
(3) coarse aggregate and steel fiber are mixed in stirrer, at the uniform velocity stir 2min;
(4) by obtained concreting in lifts, building is highly 40cm, and maintenance.
Embodiment 3
High-geotemperature tunnel heat shield liner building concrete, 1m
3contained raw materials quality is as follows:
Cement 380kg, coarse aggregate 850kg, sand 550kg, water glass 210kg, glass bead 12kg, II grade of flyash 150kg, steel fiber 60kg, the third solidifying 3kg, high performance water reducing agent of polyocarboxy acid 2.5kg.
The preparation method of above-mentioned heat resistance concrete, comprises the following steps:
(1) prepare starting material, and check all raw-material quality;
(2) cement, sand, II grade of flyash, glass bead, third solidifying, high performance water reducing agent of polyocarboxy acid are mixed forced mixer and stir, at the uniform velocity stir 1.5min with suitable speed, add water glass while stirring and stir.
(3) coarse aggregate and steel fiber are mixed in stirrer, at the uniform velocity stir 2min;
(4) by obtained concreting in lifts, building is highly 40cm, and maintenance.
Comparative example 1
A kind of C30 High-geotemperature tunnel heat shield liner building concrete, 1m
3contained raw materials quality is as follows:
Cement 345kg, coarse aggregate 910kg, sand 478kg, water 100kg, water glass 100kg, glass bead 10kg, II grade of flyash 100kg, steel fiber 80kg, the third solidifying 4kg, high performance water reducing agent of polyocarboxy acid 3kg.
After concrete pouring 28d, recording its ultimate compression strength is 29.3MPa.Contrast with embodiment 1, when dry glass, concrete strength declines to a great extent, and is difficult to meet concrete requirement of strength design.
Comparative example 2
A kind of C30 High-geotemperature tunnel heat shield liner building concrete, 1m
3contained raw materials quality is as follows:
Cement 345kg, coarse aggregate 912kg, sand 480kg, water glass 200kg, glass bead 10kg, II grade of flyash 100kg, steel fiber 20kg, the third solidifying 4kg, high performance water reducing agent of polyocarboxy acid 3kg.
After concrete pouring 28d, recording its ultimate compression strength is 35.9MPa, and leakless, waterproof effect is better.Compared with embodiment 1, steel fiber reduces, and concrete strength reduces.When concrete being placed in the High-geotemperature environment described in embodiment 1, concrete side starts crack.
Comparative example 3
A kind of C30 High-geotemperature tunnel heat shield liner building concrete, 1m
3contained raw materials quality is as follows:
Cement 345kg, coarse aggregate 910kg, sand 478kg, water glass 200kg, glass bead 10kg, II grade of flyash 100kg, steel fiber 80kg, high performance water reducing agent of polyocarboxy acid 3kg.
After concrete pouring 28d, recording its ultimate compression strength is 38.0MPa, leakless.Concrete is placed in the High-geotemperature environment described in embodiment 1, inside concrete significantly has water to infiltrate, and is reduced by the concrete strength of water erosion side.
Compared with comparative example, the heat insulating concrete obtained by embodiment has the performance of lagging material and general lining concrete concurrently, good heat-insulation effect, intensity is high, but also there is cracking resistance, water resistance, constructing operation is convenient, can be widely applied in the Tunnel Second Lining concrete of High-geotemperature geothermal area.
Claims (4)
1. High-geotemperature tunnel heat shield liner building concrete, is characterized in that, 1m
3contained raw materials quality is: cement 300 ~ 380kg, coarse aggregate 850 ~ 1000kg, sand 450 ~ 550kg, water glass 200 ~ 220kg, glass bead 8 ~ 12kg, II grade of flyash 50 ~ 150kg, steel fiber 40 ~ 80kg, the third solidifying 3 ~ 5kg, high performance water reducing agent of polyocarboxy acid 2 ~ 3kg.
2. High-geotemperature tunnel according to claim 1 heat shield liner building concrete, is characterized in that, coarse aggregate is continuous grading rubble, and particle diameter is 5 ~ 31.5mm.
3. High-geotemperature tunnel according to claim 1 heat shield liner building concrete, is characterized in that, described glass bead is expanded and vitrified small ball, and specification is 80 ~ 120kg/m
3, size is 1mm ~ 3mm, and thermal conductivity is 0.048 ~ 0.070/W/ (mK).
4. High-geotemperature tunnel according to claim 1 heat shield liner building concrete, it is characterized in that, preparation method comprises the following steps:
(1) prepare starting material, and check all raw-material quality;
(2) cement, sand, II grade of flyash, glass bead, third solidifying, high performance water reducing agent of polyocarboxy acid are mixed forced mixer and stir, add water glass while stirring and stir;
(3) coarse aggregate and steel fiber are mixed in stirrer and at the uniform velocity stir obtained concrete;
(4) by obtained concreting in lifts, building is highly 40cm, and maintenance.
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|---|---|---|---|
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| CN201510520397.1A CN105060836B (en) | 2015-08-21 | 2015-08-21 | Heat-insulated lining concrete in High-geotemperature tunnel and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110485377A (en) * | 2019-07-16 | 2019-11-22 | 中电建十一局工程有限公司 | A kind of light section canal lining construction method |
| CN110510954A (en) * | 2019-09-20 | 2019-11-29 | 长安大学 | High-strength sprayed concrete for high-ground-temperature tunnel 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 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102199024A (en) * | 2011-04-29 | 2011-09-28 | 济南高新区工业废弃物利用研发中心 | Dry-mixed masonry mortar for industrial dust |
| CN102261133A (en) * | 2011-04-28 | 2011-11-30 | 济南大学 | Glass micro bead/fly ash composite exterior wall insulating board |
| CN103771785A (en) * | 2014-01-23 | 2014-05-07 | 太原理工大学 | Thermal-insulation steel fiber concrete and application and preparation method thereof |
-
2015
- 2015-08-21 CN CN201510520397.1A patent/CN105060836B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102261133A (en) * | 2011-04-28 | 2011-11-30 | 济南大学 | Glass micro bead/fly ash composite exterior wall insulating board |
| CN102199024A (en) * | 2011-04-29 | 2011-09-28 | 济南高新区工业废弃物利用研发中心 | Dry-mixed masonry mortar for industrial dust |
| CN103771785A (en) * | 2014-01-23 | 2014-05-07 | 太原理工大学 | Thermal-insulation steel fiber concrete and application and preparation method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110485377A (en) * | 2019-07-16 | 2019-11-22 | 中电建十一局工程有限公司 | A kind of light section canal lining construction method |
| CN110510954A (en) * | 2019-09-20 | 2019-11-29 | 长安大学 | High-strength sprayed concrete for high-ground-temperature tunnel and preparation method thereof |
| CN110510954B (en) * | 2019-09-20 | 2020-11-27 | 长安大学 | High-strength sprayed concrete for high-ground-temperature tunnel 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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Inventor after: Chen Guoqing Inventor after: Liu Hui Inventor after: Liu Ding Inventor after: Zhao Cong Inventor after: Li Tianbin Inventor before: Chen Guoqing Inventor before: Liu Hui Inventor before: Zhao Cong Inventor before: Li Tianbin |
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