CN103224364A - Low carbon and high performance series concrete special for tunnel spraying - Google Patents
Low carbon and high performance series concrete special for tunnel spraying Download PDFInfo
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- CN103224364A CN103224364A CN2013101317283A CN201310131728A CN103224364A CN 103224364 A CN103224364 A CN 103224364A CN 2013101317283 A CN2013101317283 A CN 2013101317283A CN 201310131728 A CN201310131728 A CN 201310131728A CN 103224364 A CN103224364 A CN 103224364A
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Abstract
The invention provides a low carbon and high performance series concrete special for tunnel spraying. The concrete is prepared by mixing different mineral admixtures of different mixing amounts and adopting a low water-binder ratio, a high efficiency water reducer and an alkali-free setting accelerator. The prepared concrete has the properties of high density, good workability and durability, and can satisfy the requirements of different surrounding rock grades for the early strength of sprayed concrete. In the invention, sprayed concrete density is determined according to an environmental comprehensive level, and then a gelling material formula is selected according to a density index. Designers and constructors can select different gelling material formulas and concrete proportions according to different environmental levels and surrounding rock levels. With the characteristics of low hydration heat, high density, good workability, etc., the concrete material also has the efficacy of reducing environmental pollution, improving work environment, reducing the rebound rate, saving engineering cost and the like. Thus, the energy can be saved, carbon emission and environmental pollution are reduced, and engineering cost is substantially saved.
Description
Technical field
The present invention relates to material of construction, is a kind of sprayed concrete material that is exclusively used in varying environment integrated level, other tunnel preliminary bracing structure of country rock level specifically.
Background technology
At present, the most composite linings that adopt of mountain tunnel structure, the minority tunnel structure adopts the structure formation of single shell lining, no matter tunnel structure adopts composite lining or single shell lining, is main supporting means with sprayed concrete all.Behind the tunnel excavation, to the country rock sprayed concrete, its objective is and in " the shortest " time, to restrain the lax or distortion of country rock with " the fastest " speed.Make sprayed concrete performance support action, require it in " short period of time ", to reach certain intensity, the early strength of Here it is sprayed concrete.Simultaneously, shotcrete should have good clinging power, so that closely connected stressed jointly with country rock, also requires its rebound degree little, guarantees that quality of concrete also reduces cost as much as possible.
Countries in the world exist aspect sprayed concrete prescription and construction technology than big difference, since complex process and when country rock is not stablized as yet, performing, the difficult quality guarantee of shotcrete, and there are major safety risks in tunnel structure.Adopt sprayed concrete to start late in China's tunnel structure, so it is bigger with Japan and some developed country's gaps of Europe aspect spray technology and concrete formulation, the tunnel construction of shotcrete adopts dried pressure spray process in most cases, and dust is big, resilience is many, proportioning is restive; In most cases using has the alkali accelerating chemicals, bigger to workman's skin damage, and concrete corrosion under groundwater effect is serious; The gelling material adopts single P.O52.5 silicate cement and cement consumption big, and folk prescription concrete cement consumption surpasses 500kg, both uneconomical also not environmental protection.For this reason, be necessary to study a kind of novel injection concrete material, this material can satisfy both save energy, low-carbon environment-friendly, can improve the working environment of workers again, can also improve concrete performance.
Summary of the invention
The object of the present invention is to provide the high performance jetting concrete of a series of different mixture ratio and gelling material formula, can adapt to varying environment type and country rock rank, reduce engineering cost, prolong tunnel structure work-ing life.This concrete material generally has characteristics such as hydration heat is low, degree of compactness is high, good workability, also has the environmental pollution of minimizing, improves Working environment, reduces effects such as rebound degree and saving engineering cost.
Low-carbon (LC) high performance jetting concrete material of the present invention is achieved in that the degree of compactness of determining sprayed concrete according to the environment comprehensive grade, selects the gelling material formula for use by the degree of compactness index again; Determine the strength grade of sprayed concrete according to the country rock rank, select concrete mix for use by strength grade again.Concrete material adopts the forced mixer mix in the tunnel, wet spraying process sprays.
According to the environment hazard rating that effect causes to tunnel structure, be A, B, C, D, E Pyatyi with the environment comprehensive grade classification, wherein E level environment is the poorest, A level environment is best.The degree of compactness grade of tunnel environment integrated level and sprayed concrete and the relation of degree of compactness index see Table 1, and the strength grade of country rock rank and sprayed concrete and the relation of intensity index see Table 2.
The relation of table 1 environment comprehensive grade and sprayed concrete degree of compactness index
The relation of table 2 country rock rank and sprayed concrete strength index
Low-carbon (LC) high-performance tunnel sprays special-purpose series concrete, determines that according to different environment comprehensive grades and country rock rank the tunnel sprays the prescription of high performance concrete, and adopts following step to obtain:
(1) determines tunnel lining concrete design variable index according to tunnel environment integrated level and country rock rank, different degree of compactness indexs are determined to mix mineral admixture kind and volume in the lining concrete gelling material, the gelling material adopts dispensing station pattern or mixing station mode of manufacture, each powder body material carries out the physics homogenizing in proportion, and described middle plural gel material determines that according to different degree of compactness indexs sprayed concrete gelling material formula sees table 3 for details:
The corresponding sprayed concrete gelling of the different degree of compactness indexs of table 3 material formula
Table 3 is by sprayed concrete displacement flux value test result, determines the corresponding sprayed concrete gelling of different degree of compactness indexs material formula.
The requirement of each powder body material of gelling material is in the table: cement: 42.5 grades of ordinary Portland cements, specific surface area＞500kg/m
2Flyash: I level flyash, specific surface area 750kg/m
2About; Breeze: S105 level breeze, specific surface area 〉=500kg/m
2Silicon ash specific surface area 〉=20000kg/m
2Limestone powder specific surface area 〉=600kg/m
2
(2) adopting (1) gained sprayed concrete gelling material according to the varying strength index is main raw material, adds to join to obtain the series of targets concrete after coarse-fine aggregate mixes, and its proportioning sees table 4 for details:
The corresponding sprayed concrete proportioning of table 4 varying strength degree index
Table 4 is by the compressive strength of sprayed concrete test result, determines the proportioning of the corresponding sprayed concrete of varying strength index.
Concrete mix is chosen and must be considered following fundamental principle in the table:
(1) proportioning only is applicable to wet spraying process in the table, and when the tunnel is in gelling material use quantity capping under the freeze thawing environment, water-cement ratio takes off limit;
(2) proportioning must be used water-reducing rate 〉=25% high efficiency water reducing agent and alkali-free quick-coagulant in the employing table, guarantees that simultaneously water reducer and accelerating chemicals and gelling material have good consistency;
(3) be under the freeze thawing environment and underground water is grown when the tunnel, if sprayed concrete should be selected bleed type water reducer for use when adopting the plural gel material.
Concrete adopts the requirement of aggregate to be:
(1) coarse aggregate is selected 5～15mm peastone for use, crush index≤8%, pin, platy shaped particle total content≤4%, silt content≤0.5%, tight clearance rate≤40%;
(2) fine aggregate is selected thick river sand in the fineness modulus 2.7～3.2, silt content≤2.0%, clod content≤0.5% for use.
The performance index of the fineness index of above gelling material formula and each powder body material and concrete mix parameter and coarse-fine aggregate, admixture can guarantee that high performance jetting concrete of the present invention has good mechanical performance, closely knit performance and endurance quality, also can adapt, satisfy the work-ing life of tunnel structure with tunnel environmental rating of living in and country rock rank.
Compared with prior art, the invention has the beneficial effects as follows: concrete adopts and to mix concrete serviceability behind the mineral admixture, closely knit performance and mechanical property in low water binder ratio, high efficiency water reducing agent and alkali-free quick-coagulant and the gelling material and be significantly improved, remarkable to reducing concrete springback, reduction hydration heat and energy conservation and consumption reduction effects, make it to be applied to both can improve structure durability in the tunnel structure, can improve workman's operating environment, reduction operation intensity again, also helping environmental protection, reduce cost, is a technology of benefiting the nation and the people.
Embodiment
Low-carbon (LC) high-performance of the present invention tunnel sprayed concrete can reach C20, C25, C30, C35, C40 strength grade respectively, satisfies to be in tunnel structure requirement in work-ing life under varying environment type and the different surrounding rock level conditions.Below provide specific embodiments.
1, the plural gel material can be realized by dispensing station pattern or mixing station pattern, specific practice is earlier with the fineness of difference grindings such as cement, flyash, breeze and limestone powder in the plural gel material to regulation, make finished product, determine gelling material component according to the tunnel structure performance requirement then, prepare in design gelling material formula ratio, generate high-quality plural gel material.
Concerning the high performance concrete of component complexity, the composite gelled material that concrete is required is put into dispensing station or mixing station production, with separately separately the powder body material of grinding carry out pre-homogenizing, just can guarantee not increase existing concrete churning time and improve concrete uniformity greatly, help guaranteeing construction quality and endurance quality.
2, concrete stirs and easily adopts cement to wrap up in sand substep paddling process, and concrete implementation step is earlier gelling material, sand and 1/3 water consumption for preparing to be dropped into stirrer premixing 30s; Then high efficiency water reducing agent is joined in the residue water consumption and mix thoroughly, it is dropped in the stirrer with whole coarse aggregates stir 90s.
A large amount of evidences, it is remarkable that sprayed concrete adopts cement to wrap up in sand substep paddling process effect, and the every performance of concrete all is significantly increased, and illustrates that this stirring technique can fully excite the activity of mineral admixture, particularly the later stage activity improves concrete mechanics and endurance quality.
3, concrete performs and should adopt wet spraying process, requires the slump of sprayed concrete to reach about 18cm, during injection accelerating chemicals is added from nozzle, the volume of strict control accelerating chemicals.
Facts have proved that shotcrete performs the employing wet-spray technique, greatly improve operating environment, reduce the resilience inventory, concrete mix is controlled easily, concrete stable performance, and good uniformity has improved concrete jet quality.
Claims (3)
1. low-carbon (LC) high-performance tunnel sprays special-purpose series concrete, determines that according to different environment comprehensive grades and country rock rank the tunnel sprays the high performance concrete prescription, and adopts following step to obtain:
(1) determines that according to tunnel environment integrated level and country rock rank the different degree of compactness indexs of tunnel lining concrete design variable index determine lining concrete gelling material formula, the gelling material adopts the dispensing station mode of manufacture, each powder body material carries out the physics homogenizing in proportion, described gelling material formula determines that according to different degree of compactness indexs sprayed concrete gelling material formula sees following table for details:
(2) adopting (1) gained sprayed concrete plural gel material according to the varying strength index is main raw material, adds to join to obtain the series of targets concrete after coarse-fine aggregate mixes, and the sprayed concrete proportioning sees following table for details:
。
2. low-carbon (LC) high-performance according to claim 1 tunnel sprays special-purpose series concrete, it is characterized in that: the requirement of each powder body material of gelling material is: cement: 42.5 grades of ordinary Portland cements, specific surface area＞500kg/m
2Flyash: I level flyash, specific surface area 750kg/m
2About; Breeze: S105 level breeze, specific surface area 〉=500kg/m
2Silicon ash specific surface area 〉=20000kg/m
2Limestone powder specific surface area 〉=600kg/m
2
3. low-carbon (LC) high-performance according to claim 1 tunnel sprays special-purpose series concrete, it is characterized in that: described aggregate can be coarse aggregate and fine aggregate, and: (1) coarse aggregate is selected 5～15mm peastone for use, crush index≤8%, pin, platy shaped particle total content≤4%, silt content≤0.5%, tight clearance rate≤40%; (2) fine aggregate is selected thick river sand in the fineness modulus 2.7～3.2, silt content≤2.0%, clod content≤0.5% for use.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310131728.3A CN103224364B (en) | 2013-04-16 | 2013-04-16 | Low-carbon (LC) high-performance tunnel sprays series special concrete |
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| CN201310131728.3A CN103224364B (en) | 2013-04-16 | 2013-04-16 | Low-carbon (LC) high-performance tunnel sprays series special concrete |
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| CN103224364A true CN103224364A (en) | 2013-07-31 |
| CN103224364B CN103224364B (en) | 2016-05-11 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105541222A (en) * | 2015-12-23 | 2016-05-04 | 大同煤矿集团有限责任公司 | High strength environment friendly sprayed concrete |
| CN109162732A (en) * | 2018-08-21 | 2019-01-08 | 华东建工集团有限公司 | A kind of shotcrete construction method |
| CN109437706A (en) * | 2018-12-27 | 2019-03-08 | 中交公局第三工程有限公司 | A kind of gunite concrete and its preparation method and application |
| CN110627446A (en) * | 2019-10-18 | 2019-12-31 | 保利长大工程有限公司 | Economical and environment-friendly tunnel shotcrete and construction process |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102795819A (en) * | 2012-08-23 | 2012-11-28 | 西南交通大学 | Low-carbon high-performance tunnel shotcrete composite cementing material |
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2013
- 2013-04-16 CN CN201310131728.3A patent/CN103224364B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102795819A (en) * | 2012-08-23 | 2012-11-28 | 西南交通大学 | Low-carbon high-performance tunnel shotcrete composite cementing material |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105541222A (en) * | 2015-12-23 | 2016-05-04 | 大同煤矿集团有限责任公司 | High strength environment friendly sprayed concrete |
| CN109162732A (en) * | 2018-08-21 | 2019-01-08 | 华东建工集团有限公司 | A kind of shotcrete construction method |
| CN109437706A (en) * | 2018-12-27 | 2019-03-08 | 中交公局第三工程有限公司 | A kind of gunite concrete and its preparation method and application |
| CN110627446A (en) * | 2019-10-18 | 2019-12-31 | 保利长大工程有限公司 | Economical and environment-friendly tunnel shotcrete and construction process |
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| CN103224364B (en) | 2016-05-11 |
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