CN102838323B - High-performance concrete gel material for tunnel and application thereof - Google Patents
High-performance concrete gel material for tunnel and application thereof Download PDFInfo
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- CN102838323B CN102838323B CN2012103502000A CN201210350200A CN102838323B CN 102838323 B CN102838323 B CN 102838323B CN 2012103502000 A CN2012103502000 A CN 2012103502000A CN 201210350200 A CN201210350200 A CN 201210350200A CN 102838323 B CN102838323 B CN 102838323B
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Abstract
The invention discloses a concrete gel material which comprises cement and silica solution. The invention further discloses a high-performance concrete for tunnel prepared through the concrete gel material provided by the invention. The high-performance concrete is suitable to be applied to injecting concrete, moulding concrete and others. Through the adoption of the concrete gel material or the high-performance concrete for the tunnel provided by the invention for injecting the concrete, the rebound ratio can be effectively reduced and even reduced to 4.1% to the minimum; and the concrete gel material or the high-performance concrete is good in working performance; the obtained concrete finished product is high in early strength, and good in freezing resistance; the waterproof performance and the wearable performance are improved; the quantity of used cement can be reduced; the carbon emission can be reduced; and good economic benefit and environment-friendly benefit are brought.
Description
Technical field
The present invention relates to a kind of concrete gel material, particularly the concrete gel material of high performance concrete for a kind of tunnel.
Background technology
After the nineties in 20th century, construction due to many large structures especially high-rise and Longspan Bridge, the Concrete Design grade improves, the Application of composite of heavy dose of high efficiency water reducing agent and mineral admixture, make the water cement ratio (water-cement ratio) can decrease, the mixture strength development that preparation is produced is rapid, has met engineering construction to concrete demand.In this period, a series of great variations have also occurred in the cement concrete technology, comprise that the tricalcium silicate (early strong mineral) in cement increases, grinding fineness strengthens, and activity is increased substantially; Transport and store the development of cement with the large packaging means of bulk transporter, the temperature while making cement enter concrete mixer obviously raises, and can reach 90-100 ℃ especially during the broiling summer; The increase of cement consumption in concrete, further aggravated the aquation temperature rise.The aquation temperature rise causes the concrete autogenous shrinkage to increase, because concrete autogenous contraction increases, especially early age strength of concrete and Young's modulus rapid development, the ability of creeping reduces very soon, the elasticity tensile stress that concrete early deformation is tied produce obviously increases, and can not get relaxing, just easily occur cracking under the drying shrinkage therefore caused, temperature shrinkage additive effect under extraneous load and envrionment conditions.Although the crack occurred in the time of many is still in 0.20mm, but thisly be considered to the crack harmless to structural bearing capacity, from the angle of weather resistance, extraneous rodent medium enters concrete passage just, causes a hidden trouble to the weather resistance of concrete structure.
In constructing tunnel and some other special concrete construction environment, need to carry out construction of shotcrete, when concrete is sprayed onto target location, acting in conjunction due to the power of gravity and elastic force or other effect, make concrete springback, the rebound degree of conventional concrete is in 15% left and right, even larger, has caused the waste of material and the deterioration of workmen's Working environment.How improving concrete weather resistance and reducing the rebound of shotcrete rate is the popular direction of tunnel with concrete gel material research always.
Summary of the invention
To the object of the invention is to that the existing concrete weather resistance is not enough, cement consumption is excessive, spray the high shortcoming of rebound degree in order overcoming, a kind of tunnel high performance concrete gelling material to be provided.
In order to realize the foregoing invention purpose, the technical solution used in the present invention is as follows: a kind of concrete gel material comprises cement and silicon sol;
Described silicon sol is the dispersion system of silica dioxide granule in water, and the silicon-dioxide after the silicon sol dehydration and the mass ratio of cement are 0.3～3:100.
Preferably, the mass ratio of the silicon-dioxide after described silicon sol dehydration and cement is 0.5～1:100.
Silicon sol can effectively reduce the rebound degree of sprayed concrete, concrete can be sprayed to rebound degree is minimum is down to 4.1%; And nanometer grade silica can obviously reduce the textural defect of cement slurry, improves microtexture, improve degree of compactness and the intensity of hardening of cement slurry.In silicon sol, with respect to concrete activeconstituents, be Silicon dioxide, hydrate, so limit silicon sol with the silicon-dioxide after the silicon sol dehydration.
Preferably, described concrete gel material also comprises nano-calcium carbonate, and the particle diameter of described nano-calcium carbonate is 1～60nm, and the silicon-dioxide after described nano-calcium carbonate, silicon sol dehydration and the mass ratio of cement are 0.3～3:0.3～3:100.
Nano-calcium carbonate, in the hydration process of grout, participates in hydration reaction, generates calcium aluminate of hydrated carbon, hinders or delay the conversion of ettringite AFt to AFm.The quantity that makes ettringite AFt in grout that adds of nano-calcium carbonate improves, and low-carbon type calcium aluminate of hydrated carbon 3CaOAl occurs
2o
3caCO
311H
2o, its structure is closely knit, can be beneficial to concrete impermeability and improve.Nano-calcium carbonate can also play lubrication, and its admixture is conducive to increase substantially the slot handling capacity of corresponding mix.Along with nano-calcium carbonate mixes, the C-S-H gel can form and bonding on nano-calcium carbonate surface, and ettringite also can be at the calcium carbonate Surface Creation, all can form to take the hedgehog structure that nano-calcium carbonate is core.Formation be take the nanometer breeze as network node, the how nano level C-S-H gel of bonding, and be bonded to three-dimensional net structure, concrete early strength can be improved, and physical and mechanical property and the weather resistance of hardening of cement slurry can be improved widely.
Preferably, the mass ratio of the silicon-dioxide after described nano-calcium carbonate, silicon sol dehydration and cement is 0.5～1:0.5～1:100.
Preferably, described nano-calcium carbonate is the paste nano-calcium carbonate.
The paste nano-calcium carbonate can be so that nano-calcium carbonate adds construction to be more prone to.
Preferably, described nano-calcium carbonate particle diameter is 15～40nm.
Preferably, described concrete gel material also comprises microballon, and the silicon-dioxide after described microballon, nano-calcium carbonate, silicon sol dehydration, the mass ratio of cement are: 4～25:0.3～3:0.3～3:75～95; Described microballon is ganoid vitreum, mainly comprises following mass percent component: silicon-dioxide 50～55%, aluminium sesquioxide 25～26%, ferric oxide 5～7%, calcium oxide 5～6%, median size 1.0～1.2 μ m, density 2.52g/cm
3, apparent density 0.8-1.0g/cm
3, spheroid ultimate compression strength>=800MPa, water content≤0.1%.
Adding of microballon can improve concrete serviceability, and can improve the concrete gel material activity, and hydrated product is finer and close, further improves concrete mechanical property and endurance quality.
Preferably, described concrete gel material also comprises flyash, and the silicon-dioxide after described microballon, flyash, nano-calcium carbonate, silicon sol dehydration, the mass ratio of cement are: 4～12:15～40:0.3～3:0.3～3:50～80.
Flyash can replacing partial cement, can reduce costs and reduce carbon emission, can effectively reduce hydration heat of concrete, and flyash is conducive to improve workability of concrete, and density further improves concrete weather resistance.
Further preferred, described flyash is the first level flour coal ash.
Further preferred, the silicon-dioxide after described microballon, flyash, nano-calcium carbonate, silicon sol dehydration, the mass ratio of cement are: 6～12:20～40:0.5～1:0.5～1:55～80.
Described silicon sol, nano-calcium carbonate, microballon, flyash are used in proportion simultaneously, can make and adopt concrete over-all properties prepared by concrete gel material provided by the invention to improve.
Described concrete gel material is applied to concrete.
Compared with prior art, beneficial effect of the present invention
Adopt concrete gel material provided by the invention, nano material can obviously reduce the textural defect of cement slurry, improves microtexture, improves degree of compactness and the intensity of hardening of cement slurry.Silicon sol can effectively reduce the rebound degree of sprayed concrete, it minimumly can be down to 4.1%; And nanometer grade silica can obviously reduce the textural defect of cement slurry, improves microtexture, improve degree of compactness and the intensity of hardening of cement slurry.Nano-calcium carbonate, in the hydration process of grout, participates in hydration reaction, generates calcium aluminate of hydrated carbon, hinders or delay the conversion of ettringite AFt to AFm.The quantity that makes ettringite AFt in grout that adds of nano-calcium carbonate improves, and low-carbon type calcium aluminate of hydrated carbon 3CaOAl2O3CaCO311H2O occurs, and its structure is closely knit, can be beneficial to concrete impermeability and improve.Nano-calcium carbonate can also play lubrication, and its admixture is conducive to increase substantially the slot handling capacity of corresponding mix.Along with nano-calcium carbonate mixes, the C-S-H gel can form and bonding on nano-calcium carbonate surface, and ettringite also can be at the calcium carbonate Surface Creation, all can form to take the hedgehog structure that nano-calcium carbonate is core.Formation be take the nanometer breeze as network node, the how nano level C-S-H gel of bonding, and be bonded to three-dimensional net structure, can improve widely physical and mechanical property and the weather resistance of hardening of cement slurry.
Adding of microballon can improve concrete serviceability, and the ultra-fine characteristics of microballon can improve the concrete gel material activity, and hydrated product is finer and close, further improves concrete mechanical property and endurance quality.
Flyash coordinates silicon sol and paste nano-calcium carbonate with microballon simultaneously, these two kinds of non-nano powder materials of silicon sol and paste nano-calcium carbonate are brought in the mixing concrete thing by mixing water, give full play to the nano material activity, can significantly improve concrete durability.Meanwhile, two kinds of active mineral admixtures of flyash and microballon partly replace cement, but the decrease cement consumption reduces carbon emission, has good economic benefit and environmental benefit.
Embodiment
Below in conjunction with test example and embodiment, the present invention is described in further detail.But this should be interpreted as to the scope of the above-mentioned theme of the present invention only limits to following experimental example, all technology realized based on content of the present invention all belong to scope of the present invention.
Silicon sol (or silicon sol and nano-calcium carbonate) is added to the concrete mixing water, stir, itself and cement, aggregate (or comprising microballon, flyash, cement, aggregate) mix is even, while mixing other admixture, should be according to state and the utilization requirement of admixture, formulate rational mixing step, determine simultaneously and churning time obtain the tunnel high performance concrete.Churning time and aggregate, water cement ratio (water-cement ratio) do not belong to technical scheme content of the present invention, and those skilled in the art can have no contrary opinion according to corresponding conditions and determine above-mentioned experiment condition.Following experimental example all adopts aforesaid method to make the tunnel high performance concrete; Comparative Examples only adopts cement to make concrete as concrete gel material.In embodiment, embodiment 1～3 adopts the silicon sol of solid content 40%, and embodiment 4～6 adopts 30% silicon sol.
Each experimental example concrete gel material formula of table 1
| Cement (kg) | Silicon sol (kg) | Nano-calcium carbonate (kg) | Microballon (kg) | Flyash (kg) | |
| Embodiment 1 | 100 | 1.5 | |||
| Embodiment 2 | 100 | 1.3 | 0.4 | ||
| Embodiment 3 | 100 | 7 | 0.6 | ||
| Embodiment 4 | 50 | 1 | 3 | 12 | 40 |
| Embodiment 5 | 60 | 2 | 1.6 | 8 | 30 |
| Embodiment 6 | 80 | 4 | 0.5 | 4 | 20 |
| Comparative Examples | 100 |
The concrete gel material obtained by above-mentioned experimental example formula is made sprayed concrete, in described sprayed concrete, the mass ratio of concrete gel material, aggregate, water is 18.5:75.5:6, and carrying out injection experiment, the ratio of springback capacity and injection total amount is rebound degree.The concrete gel material that durability experiment adopts above-mentioned experimental example formula to obtain is made form concrete, and in described form concrete, the mass ratio of concrete gel material, aggregate, water is 15:78.5:6.5.Carry out the endurance quality tests such as impervious, anti-carbonization, displacement flux, resisting erosion of sulfate, freeze thawing according to GB/T50082-2009 " normal concrete long-term behaviour and endurance quality experimental technique standard ".Obtain following result:
Each experimental example concrete performance parameter of table 2
Table 3 freezing and thawing test result
From above experimental data, can draw to draw a conclusion: adopt concrete gel material provided by the invention with respect to conventional concrete gel material, can make the rebound degree of sprayed concrete obviously reduce, and the form concrete anti-permeability performance obtained obviously improves, 56d displacement flux, carbonation depth obviously reduce, and coefficient against corrosion obviously improves; And the frozen process experiment result also shows that the concrete antifreezing performance that adopts concrete gel material provided by the invention to prepare improves.Show that the concrete durability that adopts concrete gel material provided by the invention to prepare improves.Obtain concrete gel material provided by the invention and be applicable to tunnel sprayed concrete and form concrete, and can reduce the experimental result that concrete springback and weather resistance are improved.
Claims (11)
1. a tunnel sprays to build and uses concrete gel material, it is characterized in that, described concrete gel material comprises cement and silicon sol; Described silicon sol is the dispersion system of silica dioxide granule in water, and the silicon-dioxide after the silicon sol dehydration and the mass ratio of cement are 0.3～3:100;
Described concrete gel material also comprises nano-calcium carbonate, and the particle diameter of described nano-calcium carbonate is 1～60nm, and the silicon-dioxide after described nano-calcium carbonate, silicon sol dehydration and the mass ratio of cement are 0.3～3:0.3～3:100.
2. concrete gel material as claimed in claim 1, it is characterized in that: the silicon-dioxide after described nano-calcium carbonate, silicon sol dehydration and the mass ratio of cement are 0.5～1:0.5～1:100.
3. concrete gel material as claimed in claim 1 or 2, is characterized in that, described nano-calcium carbonate is the paste nano-calcium carbonate.
4. concrete gel material as claimed in claim 1 or 2, is characterized in that, described nano-calcium carbonate particle diameter is 15～40nm.
5. concrete gel material as claimed in claim 3, is characterized in that, described nano-calcium carbonate particle diameter is 15～40nm.
6. concrete gel material as claimed in claim 1, it is characterized in that, described concrete gel material also comprises microballon, and the silicon-dioxide after described microballon, nano-calcium carbonate, silicon sol dehydration, the mass ratio of cement are: 4～25:0.3～3:0.3～3:75～95; Described microballon is ganoid vitreum, mainly comprises following mass percent component: silicon-dioxide 50～55%, aluminium sesquioxide 25～26%, ferric oxide 5～7%, calcium oxide 5～6%, median size 1.0～1.2 μ m, density 2.52g/cm
3, apparent density 0.8-1.0g/cm
3, spheroid ultimate compression strength>=800MPa, water content≤0.1%.
7. concrete gel material as claimed in claim 6, it is characterized in that, described gelling material also comprises flyash, and the silicon-dioxide after described microballon, flyash, nano-calcium carbonate, silicon sol dehydration, the mass ratio of cement are: 4～12:15～40:0.3～3:0.3～3:50～80.
8. concrete gel material as claimed in claim 7, is characterized in that, described flyash is the first level flour coal ash.
9. concrete gel material as claimed in claim 7, is characterized in that, the silicon-dioxide after described microballon, flyash, nano-calcium carbonate, silicon sol dehydration, the mass ratio of cement are: 6～12:20～40:0.5～1:0.5～1:55～80.
10. the concrete gel material that comprises cement and silicon sol sprays the application in building in tunnel; Described silicon sol is the dispersion system of silica dioxide granule in water, and the silicon-dioxide after the silicon sol dehydration and the mass ratio of cement are 0.3～3:100.
11. described concrete gel material as arbitrary as claim 1～9 sprays the application in building in tunnel.
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| CN106554181A (en) * | 2016-11-14 | 2017-04-05 | 绍兴职业技术学院 | A kind of high-strength shearing resistance crack-resistant dry-mixed mortar |
| CN107083977B (en) * | 2017-06-23 | 2019-05-14 | 中国矿业大学 | A kind of grouting strengthening method of the more granularities of argillaceous soft rock tunnel subregion |
| CN109206033B (en) * | 2017-06-29 | 2022-01-21 | 润泰精密材料股份有限公司 | Non-calcined cement composition, non-calcined concrete and method for producing the same |
| CN108439842B (en) * | 2018-05-29 | 2021-05-04 | 贵州师范大学 | 3D printing concrete compacting agent and cementing material |
| 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 |
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| CN114620966A (en) * | 2020-12-11 | 2022-06-14 | 河南蓝翎环科防水材料有限公司 | High-strength impervious concrete inorganic waterproof additive and production process thereof |
| CN114956744B (en) * | 2022-04-20 | 2023-06-06 | 长安大学 | Nano modified high-density sprayed concrete and construction method of water-rich tunnel using nano modified high-density sprayed concrete |
| CN115477529A (en) * | 2022-07-26 | 2022-12-16 | 保利长大工程有限公司 | Concrete based on granite powder and preparation method thereof |
| CN115677295B (en) * | 2022-11-09 | 2023-10-31 | 中铁第四勘察设计院集团有限公司 | Shotcrete for submarine tunnel and preparation method and application thereof |
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