CN102795819A - Low-carbon high-performance tunnel shotcrete composite cementing material - Google Patents
Low-carbon high-performance tunnel shotcrete composite cementing material Download PDFInfo
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- CN102795819A CN102795819A CN2012103025035A CN201210302503A CN102795819A CN 102795819 A CN102795819 A CN 102795819A CN 2012103025035 A CN2012103025035 A CN 2012103025035A CN 201210302503 A CN201210302503 A CN 201210302503A CN 102795819 A CN102795819 A CN 102795819A
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Abstract
The invention discloses a low-carbon high-performance tunnel shotcrete composite cementing material. The low-carbon high-performance tunnel shotcrete composite cementing material is used for shotcreting construction of roads, railway tunnels and urban underground engineering. The low-carbon high-performance tunnel shotcrete composite cementing material comprises 40% of cement clinker, 25% of slag powder, 15% of coal ash, 8% of silicon ash and 12% of a mixed material. A preparation method of the low-carbon high-performance tunnel shotcrete composite cementing material comprises the following steps of preparing the above materials of which performances satisfy requirements, respectively grinding cement clinker, a mineral mixture and the mixed material into powder having different specific surface areas, and homogenizing the powder according to a formula ratio by a homogenizer to obtain a target product. Compared with the common portland cement, the low-carbon high-performance tunnel shotcrete composite cementing material has the advantages that a mineral mixture amount is greatly improved; cementing material components are changed; and performances are greatly improved. A clinker doping ratio is reduced and thus carbon emission is reduced; environmental protection is realized; and resources and energy are saved.
Description
Technical field
The present invention relates to the material of construction manufacturing, be specifically related to be used for highway, railway tunnel and city underground engineering sprayed concrete low-carbon (LC) high-performance composite gelled material technical field.
Background technology
Recent years; In the shotcrete technology; In order to adapt to different wall rock conditions and constructional method; Many novel shotcretes have appearred, like HS shotcrete, initial stage HS shotcrete, high rigidity shotcrete, fiber shotcrete, polyester shotcrete, low dust high-performance jet concrete or the like.This proves absolutely that the application of shotcrete more and more receives the attention of underground works circle, in many engineerings field, uses more and more widely, and it has become in tunnel and underground works and the geotechnical engineering supporting one of the most effective supporting means.
When carrying out the shotcrete technology; Also run into problem miscellaneous; Should possess what kind of performance like shotcrete, shotcrete is how to bring into play its support action, how further to improve the effect of shotcreting; How to guarantee the realization of its performance in the construction, and spray mixes endurance issues of doubting soil or the like.
Along with the continuous development of high-grade highway and high speed railway construction, the shared circuit proportion in tunnel is increasing, and Tunnel Engineering is different from other engineering, not easy-maintaining.This just requires tunnel structure to have enough weather resistance, and sprayed concrete is between country rock and two linings, and in a single day its weather resistance lost efficacy, and can't keep in repair.So the sprayed concrete performance should cause enough attention, because it directly contacts with underground water with country rock, be subject to corrosion and chemical erosion effect, therefore improving concrete degree of compactness is key point.At present, sprayed concrete still generally uses ordinary Portland cement, and composition is single, and quality is not high in addition, and a little less than poor, the anti-carbonization of concrete density, the corrosion resistance, weather resistance is not enough.Sprayed concrete is in time executed work behind tunnel excavation, so it is in early days with regard to bearing load, this just requires it to have enough early strengths, and this and form concrete have the difference of essence.
China's shotcrete is main to do spray still at present; The cement overwhelming majority adopts ordinary Portland cement, uses complex cement and mineral admixture situation few, and cost is high; Effect is undesirable; Need courageously many-sided the trial, in cement clinker, mix in a large amount of mineral admixtures, improve the over-all properties of sprayed concrete.
Summary of the invention
Shortcoming in view of prior art; The objective of the invention is to design a kind of low-carbon (LC) high-performance tunnel sprayed concrete plural gel material, make it to overcome the shortcoming of prior art, but both mixed the raising that mineral admixture obtains economy and the feature of environmental protection index larger amt; Hydration heat in the time of can reducing the concrete coagulation sclerosis again; Reduce concrete incipient crack, improve concrete flowing property, improve concrete degree of compactness and anti-carbonization, corrosion and chemical erosion ability.
The objective of the invention is to realize through following means.
A kind of low-carbon (LC) high-performance tunnel sprayed concrete plural gel material is used for highway, railway tunnel and city underground engineering construction of shotcrete, adopts following method to make,
Material proportion is: cement clinker 40%, slag powders 25%, flyash 15%, silicon ash 8%, blended material 12%; Each material has following performance requriements:
Cement clinker before grinding, its free calcium oxide＜1.0%, alkali content＜0.6%, 3d ultimate compression strength＞29MPa, 28d ultimate compression strength＞60MPa, the specific surface area>=500m behind grinding
2About/kg, 80 μ m tail over＜and 2.0%, 45 μ m tails over＜and 4.0%;
Flyash is selected the I level for use, sulfur trioxide content＜3.0%, calcium oxide content＜10%, CL
-Content＜0.02%, loss on ignition＜5%, 7d ultimate compression strength activity index＞80%, 28d ultimate compression strength activity index＞90%, the specific surface area>=650m behind grinding
2/ kg;
Slag micropowder reaches S105, quality coefficient K＞1.3, sulfur trioxide content＜4.0% wherein, CL
-Content＜0.06%, 7d ultimate compression strength activity index＞95%, 28d ultimate compression strength activity index＞105%, slag micropowder specific surface area＞500m
2/ kg;
Silicon ash loss on ignition＜4.0%, cl ions＜0.03%, silicon-dioxide＞90%, 28d activity index＞90%, specific surface area>=20000m
2/ kg;
After getting all the material ready, earlier with flyash in cement clinker and blended material grinding together, the mineral admixture and breeze respectively grinding become the powder body material of different specific surface areas, in homogenizer, each powder body material is carried out homogenizing and obtains title product by formula rate then.
The contriver adopts therapeuticcocktail of anti-retrovirals to prepare the concrete of a large amount of different ratios mineral admixtures; Then through concrete mechanics and endurance quality test; Obtain to be fit to tunnel sprayed concrete low-carbon (LC) high-performance plural gel material formula and technology under the erosion environment, select for tunnel structure system durability Design provides new material.
Compared with prior art, the invention has the beneficial effects as follows: not only the performance of cement did not reduce after the mineral admixture volume strengthened, and was significantly improved on the contrary, particularly controlled concrete incipient crack, reduction hydration heat, it is remarkable to improve the concrete density effect.The fineness index of each component can guarantee that high-performance plural gel material of the present invention has good microcosmic continuous grading, and each levigate material can be filled the space each other, thereby has significantly improved concrete compactness and weather resistance.Owing in the gelling material, improved the addition content of mineral admixture, reduced the ratio of grog in the gelling material, reduced the usage quantity and the output of grog; Not only help environmental protection, save energy has also realized effective utilization of industrial residue simultaneously; Recycling economy reduces carbon emission.
Embodiment
Below in conjunction with embodiment the present invention is further detailed.
Plural gel material of the present invention can reach the mechanical property requirements design of 2.5 grades of strength of cement class 4s.Below provide the specific embodiments and the performance index thereof of plural gel material, the material among all embodiment all is the technical grade material except that special declaration, and material concentration all adopts weight percent.
Embodiment
One, low-carbon (LC) high-performance tunnel sprayed concrete plural gel material design strength grade is 52.5MPa.Material proportion is: cement clinker 40%, slag powders 25%, flyash 15%, silicon ash 8%, blended material 12% (limestone powder 6%, gypsum 5%, the grand skill grinding aid 1% in Shandong).
The requirement of each component is:
Cement clinker before grinding, its free calcium oxide＜1.0%, alkali content＜0.6%, 3d ultimate compression strength＞29MPa, 28d ultimate compression strength＞60MPa, the specific surface area>=500m behind grinding
2About/kg, 80 μ m tail over＜and 2.0%, 45 μ m tails over＜and 4.0%;
Flyash is selected the I level for use, sulfur trioxide content＜3.0%, calcium oxide content＜10%, CL
-Content＜0.02%, loss on ignition＜5%, 7d ultimate compression strength activity index＞80%, 28d ultimate compression strength activity index＞90%, the specific surface area>=650m behind grinding
2/ kg;
Slag micropowder reaches S105, quality coefficient K＞1.3, sulfur trioxide content＜4.0% wherein, CL
-Content＜0.06%, 7d ultimate compression strength activity index＞95%, 28d ultimate compression strength activity index＞105%, slag micropowder specific surface area>=500m
2/ kg;
Silicon ash loss on ignition＜4.0%, cl ions＜0.03%, silicon-dioxide＞90%, 28d activity index＞90%, specific surface area>=20000m
2/ kg.
Two, process high-performance plural gel material through homogenizer by proportioning, its each item quality parameter is:
1, intensity and time of coagulation
2, physical performance index
3, chemical property index
| Chemical index | Natural manganese dioxide | Sulphur trioxide | Cl ions | Alkali content | Loss on ignition % |
| Content (%) | 4.5 | 2.3 | 0.02 | 0.42 | 3.0 |
4, grain composition
5, with the consistency of BASF SA160 type accelerating chemicals
| The accelerating chemicals volume | Presetting period | Final setting time |
| 5％ | 16’30＂ | 29′ |
| 6％ | 6'25＂ | 20'30＂ |
| 7％ | 4'03＂ | 13'20＂ |
| 8％ | 3′ | 10′ |
Making method is: with grog and blended material grinding together; Flyash, breeze be independent grinding respectively; Silicon ash directly utilizes, and utilizes homogenizer that various frit materials are carried out homogenizing according to above-mentioned formula rate then and prepares and produce＞the dedicated high performance plural gel material of 52.5MPa.
Effect in concrete
One, proportioning: choose and intend that to join the C35 sprayed concrete be subjects, concrete apparent density 2350kg/m
3, gelling material 450kg, water-cement ratio 0.41, sand coarse aggregate ratio 51%, high performance water reducing agent of polyocarboxy acid 0.8%, BASF SA160 type high-performance alkali-free quick-coagulant 7%; Proportioning is: cement: water: sand: stone=1: 0.41: 1.94: 1.87; Select for use normal silicate normal concrete and plural gel concrete to do simultaneous test; Spray regime is a wet shot, and various powder body material consumptions of gelling material and rebound degree see the following form.
| The proportioning type | Cement powder (kg) | Breeze (kg) | Flyash (kg) | Silicon ash (kg) | Rebound degree (%) |
| JZ | 450 | - | - | - | 14.2 |
| S25F15SA8 | 234 | 112.5 | 67.5 | 36 | 9.6 |
Two, test-results
1, mechanical property test
2, endurance quality test
Can see by above testing data:
1, plural gel material concrete early anti pressured intension is lower than normal concrete, but later strength is greater than normal concrete, and each, ultimate compression strength all met design requirement in the length of time, and plural gel material concrete 28d folding strength is slightly high than benchmark;
2, the various endurance quality indexs of plural gel material concrete all are higher than normal concrete, explain that the plural gel material can improve concrete degree of compactness, improves concrete weather resistance;
3, owing to contain viscosity adulterants such as limestone powder, breeze and silicon ash in the plural gel material, reduced the rebound degree of shotcrete, realized that material effectively utilizes;
4, take a broad view of the mechanics and the endurance quality of plural gel sprayed concrete, satisfying under the mechanical property prerequisite, improved concrete weather resistance, also reduced construction costs simultaneously.
Above-mentioned specific descriptions to preferred embodiment; Those of ordinary skill in the art will appreciate that; Embodiment described here is in order to help reader understanding's principle of the present invention, should to be understood that the protection domain of inventing is not limited to such special statement and embodiment.Every making according to foregoing description variously possible be equal to replacement or change, and all is considered to belong to the protection domain of claim of the present invention.
Claims (3)
1. a low-carbon (LC) high-performance tunnel sprayed concrete plural gel material is used for highway, railway tunnel and city underground engineering construction of shotcrete, it is characterized in that, adopts following method to make:
Material proportion is: cement clinker 40%, slag powders 25%, flyash 15%, silicon ash 8%, blended material 12%; Each material has following performance requriements:
Cement clinker before grinding, its free calcium oxide＜1.0%, alkali content＜0.6%, 3d ultimate compression strength＞29MPa, 28d ultimate compression strength＞60MPa, the specific surface area＞500m behind grinding
2About/kg, 80 μ m tail over＜and 2.0%, 45 μ m tails over＜and 4.0%;
Flyash is selected the I level for use, sulfur trioxide content＜3.0%, calcium oxide content＜10%, CL
-Content＜0.02%, loss on ignition＜5%, 7d ultimate compression strength activity index＞80%, 28d ultimate compression strength activity index＞90%, the specific surface area>=650m behind grinding
2/ kg;
Slag micropowder reaches S105, quality coefficient K＞1.3, sulfur trioxide content＜4.0% wherein, CL
-Content＜0.06%, 7d ultimate compression strength activity index＞95%, 28d ultimate compression strength activity index＞105%, slag micropowder specific surface area>=500m
2/ kg;
Silicon ash loss on ignition＜4.0%, cl ions＜0.03%, silicon-dioxide＞90%, 28d activity index＞90%, specific surface area>=20000m
2/ kg;
After getting all the material ready, earlier with flyash in cement clinker and blended material grinding together, the mineral admixture and breeze respectively grinding become the powder body material of different specific surface areas, in homogenizer, each powder body material is carried out homogenizing and obtains title product by formula rate then.
2. a kind of low-carbon (LC) high-performance tunnel sprayed concrete plural gel material according to claim 1 is characterized in that: said blended material employing, gypsum, grinding aid.
3. a kind of low-carbon (LC) high-performance tunnel sprayed concrete plural gel material according to claim 2 is characterized in that, said blended material adopts limestone powder 6%, gypsum 5%, grinding aid 1%.
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|---|---|---|---|
| CN2012103025035A CN102795819A (en) | 2012-08-23 | 2012-08-23 | Low-carbon high-performance tunnel shotcrete composite cementing material |
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|---|---|---|---|
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103204643A (en) * | 2013-04-25 | 2013-07-17 | 浙江天达环保股份有限公司 | Method for preparing cement by modified compound coal ash |
| CN103224364A (en) * | 2013-04-16 | 2013-07-31 | 西南交通大学 | Low carbon and high performance series concrete special for tunnel spraying |
| CN103224365A (en) * | 2013-04-16 | 2013-07-31 | 西南交通大学 | Low carbon and high performance series concrete special for tunnel linings |
| CN103708782A (en) * | 2013-12-21 | 2014-04-09 | 兖州煤业股份有限公司 | Concrete guniting material |
| CN106242410A (en) * | 2016-08-24 | 2016-12-21 | 北海金匠水泥制品有限责任公司 | A kind of high intensity cement for construction in sea brick |
| CN108298841A (en) * | 2018-03-08 | 2018-07-20 | 同济大学 | A kind of cement being exclusively used in the gunite concrete mixed with alkali-free liquid accelerator |
| CN109415258A (en) * | 2017-02-02 | 2019-03-01 | 住友大阪水泥股份有限公司 | The manufacturing method of concrete composition and concrete composition |
| CN111595751A (en) * | 2020-06-08 | 2020-08-28 | 中铁十二局集团有限公司 | Asphalt pavement water seepage coefficient sealing material and construction method thereof |
| CN112321181A (en) * | 2020-11-25 | 2021-02-05 | 中国葛洲坝集团水泥有限公司 | Immersed tube cement and concrete |
| CN113045233A (en) * | 2021-03-16 | 2021-06-29 | 黑龙江东瑞科技发展有限公司 | Non-autoclaved admixture and preparation method thereof |
| CN113429144A (en) * | 2021-07-21 | 2021-09-24 | 广西新途茂环保科技有限公司 | Encrypted silica fume composite admixture and application thereof in high-performance concrete |
| CN110627446B (en) * | 2019-10-18 | 2022-04-26 | 保利长大工程有限公司 | Economical and environment-friendly tunnel shotcrete and construction process |
| CN116023098A (en) * | 2022-12-31 | 2023-04-28 | 四川省川铁枕梁工程有限公司 | Low-carbon high-durability concrete |
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|---|---|---|---|---|
| CN102503194A (en) * | 2011-10-08 | 2012-06-20 | 丹东海工水泥有限公司 | Special composite cementitious material for high-grade concrete of bridge expansion joints and thin-shell structures |
-
2012
- 2012-08-23 CN CN2012103025035A patent/CN102795819A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102503194A (en) * | 2011-10-08 | 2012-06-20 | 丹东海工水泥有限公司 | Special composite cementitious material for high-grade concrete of bridge expansion joints and thin-shell structures |
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103224364A (en) * | 2013-04-16 | 2013-07-31 | 西南交通大学 | Low carbon and high performance series concrete special for tunnel spraying |
| CN103224365A (en) * | 2013-04-16 | 2013-07-31 | 西南交通大学 | Low carbon and high performance series concrete special for tunnel linings |
| CN103224365B (en) * | 2013-04-16 | 2015-04-22 | 西南交通大学 | Low carbon and high performance series concrete special for tunnel linings |
| CN103224364B (en) * | 2013-04-16 | 2016-05-11 | 西南交通大学 | Low-carbon (LC) high-performance tunnel sprays series special concrete |
| CN103204643B (en) * | 2013-04-25 | 2016-03-02 | 浙江天达环保股份有限公司 | The composite flyash of a kind of modification is used for method prepared by cement |
| CN103204643A (en) * | 2013-04-25 | 2013-07-17 | 浙江天达环保股份有限公司 | Method for preparing cement by modified compound coal ash |
| CN103708782A (en) * | 2013-12-21 | 2014-04-09 | 兖州煤业股份有限公司 | Concrete guniting material |
| CN106242410A (en) * | 2016-08-24 | 2016-12-21 | 北海金匠水泥制品有限责任公司 | A kind of high intensity cement for construction in sea brick |
| KR102255378B1 (en) | 2017-02-02 | 2021-05-25 | 스미토모 오사카 세멘토 가부시키가이샤 | Concrete composition for spray-and-paste concrete |
| CN109415258A (en) * | 2017-02-02 | 2019-03-01 | 住友大阪水泥股份有限公司 | The manufacturing method of concrete composition and concrete composition |
| KR20190113526A (en) * | 2017-02-02 | 2019-10-08 | 스미토모 오사카 세멘토 가부시키가이샤 | Concrete compositions and methods of making concrete compositions |
| CN108298841A (en) * | 2018-03-08 | 2018-07-20 | 同济大学 | A kind of cement being exclusively used in the gunite concrete mixed with alkali-free liquid accelerator |
| CN110627446B (en) * | 2019-10-18 | 2022-04-26 | 保利长大工程有限公司 | Economical and environment-friendly tunnel shotcrete and construction process |
| CN111595751A (en) * | 2020-06-08 | 2020-08-28 | 中铁十二局集团有限公司 | Asphalt pavement water seepage coefficient sealing material and construction method thereof |
| CN111595751B (en) * | 2020-06-08 | 2023-10-13 | 中铁十二局集团有限公司 | Asphalt pavement water seepage coefficient sealing material and construction method thereof |
| CN112321181A (en) * | 2020-11-25 | 2021-02-05 | 中国葛洲坝集团水泥有限公司 | Immersed tube cement and concrete |
| CN113045233A (en) * | 2021-03-16 | 2021-06-29 | 黑龙江东瑞科技发展有限公司 | Non-autoclaved admixture and preparation method thereof |
| CN113429144A (en) * | 2021-07-21 | 2021-09-24 | 广西新途茂环保科技有限公司 | Encrypted silica fume composite admixture and application thereof in high-performance concrete |
| CN116023098A (en) * | 2022-12-31 | 2023-04-28 | 四川省川铁枕梁工程有限公司 | Low-carbon high-durability concrete |
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Application publication date: 20121128 |