CN103449786B - Cement-based composite material for steel box girder bridge deck, as well as preparation and pavement thereof - Google Patents
Cement-based composite material for steel box girder bridge deck, as well as preparation and pavement thereof Download PDFInfo
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- CN103449786B CN103449786B CN201310419625.7A CN201310419625A CN103449786B CN 103449786 B CN103449786 B CN 103449786B CN 201310419625 A CN201310419625 A CN 201310419625A CN 103449786 B CN103449786 B CN 103449786B
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Abstract
The invention relates to a cement-based composite material for pavement of a steel box girder bridge deck, as well as a preparation method and a pavement method thereof. The invention aims at providing a lightweight and high-toughness cement-based composite material which is suitable for pavement of larger-span steel box girder bridge decks, and the cement-based composite material comprises the following components in parts by weight: 849-881 parts of cement, 339-425 parts of quartz sand, 215-273 parts of pottery sand, 100-226 parts of fly ash, 30-56 parts of silica fume, 275-295 parts of water, 10-13 parts of water reducing agent, 40-80 parts of steel fiber, 6.5-13 parts of organic fiber and 20-30 parts of epoxy resin. Through material optimization, the durability of a bridge deck paving layer is improved, the overall dead weight is reduced, the cost of a project is simultaneously saved, and the cement-based composite material is suitable for pavement of the larger-span steel box girder bridge decks.
Description
Technical field
The invention belongs to Materials Science and Engineering field, be specifically related to a kind of steel box girder bridge face cement-base composite material and preparation method thereof and method for paving.
Background technology
Because steel box girder bridge has from heavy and light, saves the significant advantages such as steel, easily prefabricate and install, be widely used in domestic and abroad bridge, municipal engineering construction.The steel box girder bridge floor paving scheme of welding shear key+reinforcing mat+concrete+water-proof tack coat+surface layer SMA after adopting steel plate to lay rustproof layer is only applicable to the bridge of about 200m, significantly limit the construction innovation of Chinese large-sized bridge.
Traditional scheme is used for comparatively large span steel box beam bridge floor and there is following problem: 1) under the dual function of traffic loading repeatedly and high/low temperature load, cement concrete easily produces fatigue cracking, cause moisture to immerse aggravation steel bar corrosion wherein, reduce bridge work-ing life; 2) because normal concrete deadweight is comparatively large, the problems such as mechanical property and weather resistance are not good, greatly limit span of bridge lifts; 3) due to main girder body concrete comparatively pave-load layer first complete, its concrete with after water pave-load layer concrete to there is larger work poor for the length of time, make first pouring concrete from rear pouring concrete because shrinkage value different generation shearing stress is poor, additional stress is caused to structure, concrete toughness is had higher requirement.This shows, the current design to bridge pavement material does not meet actual bridge building cause completely across footpath demand for development, needs badly and is optimized bridge material of paving course.
At present, proposing new pavement structure and on the basis of Portland cement sill, develop light-weight aggregate, preferably admixture etc. is the technical way solving this difficult problem.But adopt common light aggregate concrete to there is the problem of intensity and weather resistance aspect deficiency, fatigue cracking phenomenon is of common occurrence, light aggregate concrete is in Construction Vibration process simultaneously, the density of light-weight aggregate, fine aggregate, unhydrated cement granules and cement slurry is different, floating easily appears in the mineral admixture such as light-weight aggregate and flyash, cause material of paving course to produce demixing phenomenon, affect its wear resistance and work-ing life.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of lightweight, high tenacity cement-base composite material and preparation method thereof that are applicable to compared with large-span steel box girder bridge floor paving are provided, pass through optimization of material, improve the weather resistance of bridge deck pavement and reduce overall deadweight, save construction costs simultaneously, be suitable for comparatively large-span steel box girder bridge floor paving.
For achieving the above object, the technical solution used in the present invention is as follows:
A kind of steel box girder bridge face cement-base composite material, the proportioning of each component is counted by weight:
Cement 849 ~ 881,
Quartz sand 339 ~ 425,
Pottery sand 215 ~ 273,
Flyash 100 ~ 226,
Silicon ash 30 ~ 56,
Water 275 ~ 295,
Water reducer 10 ~ 13,
Steel fiber 40 ~ 80,
Organic fibre 6.5 ~ 13,
Epoxy resin composition 20 ~ 30,
Described epoxy resin composition is the mixture of the epoxy resin that adds when preparing of cement-base composite material and solidifying agent thereof; Described organic fibre is polyvinyl alcohol fiber (PVA).
By such scheme, described cement selection PO52.5 silicate cement.
By such scheme, the fineness modulus of described pottery sand is 3.1 ~ 3.7, tap density 800-900kg/m
3, water-intake rate 10-15%; The fineness modulus 1.0 ~ 1.5 of described quartz sand.
By such scheme, described epoxy resin is bisphenol A epoxide resin or non-ion aqueous epoxy resin, epoxy equivalent (weight) 195 ± 5; Described solidifying agent is polynary amine curing agent, active hydrogen equivalent weight 400 ± 5.
By such scheme, described flyash is II level flyash or I level flyash; Described silicon ash median size is at 0.1 ~ 0.3 μm, and specific surface area is: 20 ~ 28m
2/ g.
By such scheme, described water reducer is naphthalene water reducer or polycarboxylate water-reducer.
By such scheme, described steel fiber is the carbon element cold-drawn wire cut-out type of multi-anchor fixed point, and length is 25 ~ 35mm.
By such scheme, described polyvinyl alcohol fiber length 11 ~ 13mm, density 1.3g/cm
3.
By such scheme, the preparation method of described cement-base composite material, comprises the following steps:
1) epoxy resin and solidifying agent thereof are mixed, obtain epoxy resin ingredient for subsequent use; Pottery sand is soaked in water, makes it fully absorb water saturated, take out and dry in the air to saturated dry surface;
2) after cement, quartz sand, pottery sand, flyash, silicon ash are fed intake, add water and water reducer, be uniformly mixed, add the epoxy resin ingredient mixed again, be uniformly mixed, finally add polyvinyl alcohol fiber, being stirred to fiber can equally distributed state.
By such scheme, the method for paving of described cement-base composite material, comprises the following steps:
1) in advance one deck interface adhesive is sprayed to steel box girder bridge beam slab.
2) utilize concrete tank that the lightweight high tenacity cement-base composite material prepared is transported to working-yard, directly pour into and install in the road groove of side form, manually make up a deficiency.
3) vibrate with shock club immediately after having paved, it is 6 ~ 8cm that material thickness controls, and strikes off, mechanical troweling, last covered with plastic film.
The invention has the beneficial effects as follows:
1) in Portland cement sill, the quartz sand of 0.15mm is not more than as matrix using cement, mineral admixture and median size, by organic random distribution staple fibre of Micromechanical Design and enhancing, the toughening element such as clad steel fiber can produce " bridging " effect, play power consumption, cushion and the effect being connected each fragment, great raising resistance to compression, folding strength, improve toughness of material and limit crack propagation, control critical eigenvalue width.Can form steady state cracking in tension process, when stretching strain ability is more than 1%, fracture width wherein can be stabilized in about 60 μm, and along with the raising of stretching strain ability, fracture width does not change, and the number of microfracture constantly increases.
2) add mineral admixture owing to replacing fine aggregate by light haydite part simultaneously, under the prerequisite ensureing Compressive Strength of Cement-based Materials and serviceability, also there is vesicular structure and can alleviate bridge deadweight, damping noise reduction.
3) organic polymer is added, improve material interface character greatly, Afm crystal and the polymkeric substance nethike embrane of hydrated product C-S-H gel and needle-like are interweaved, form cross one another dual-network structure, make whole mortar become finer and close, have obvious lifting to folding strength, weather resistance.
4) features such as the excellent and sustainability of this material tool high tenacity, high-bearing capacity, high-durability, serviceability is strong, have good energy-dissipating and shock-absorbing characteristic, constructability simultaneously, cost-saving.Its 28d ultimate compression strength >80MPa; 28d folding strength >10MPa; Unit weight < 2050kg/m
3; Fatigue lifetime >200 ten thousand times; Fracture toughness property index η 30>25; 28d shrinking percentage <8 × 10-4.In addition, the present invention is not only improving the excellent effect in the use properties of concrete road surface, and can reduce construction costs, has good economic benefit, is therefore specially adapted to steel box girder bridge floor paving.
Embodiment
Content of the present invention is illustrated further below in conjunction with embodiment, but not as limiting the scope of the invention.
Embodiment 1
Batching (counting by weight): PO52.5 silicate cement 881, quartz sand (fineness modulus 1.0) 425, (fineness modulus is 3.7, tap density 900kg/m to pottery sand
3, water-intake rate 15%) and 273, I level flyash 100, (at 0.3 μm, specific surface area is 28m to particle diameter to silicon ash
2/ g) 30, water 275, naphthalene water reducer 10, steel fiber (length is 35mm) 80, polyvinyl alcohol fiber (13mm, density 1.3g/cm
3) 13, the mixture 20 of bisphenol A epoxide resin (epoxy equivalent (weight) 195 ± 5) and polyamine curing agent (active hydrogen equivalent weight 400 ± 5).The specific surface area testing standard of silicon ash adopts GB/T19587-2004.
Take each starting material in proportion, sand of first making pottery soaks 10h, makes it fully absorb water saturated; Epoxy resin and solidifying agent thereof are mixed in proportion, are uniformly mixed; Take out the pottery sand soaked adds in agitator kettle under the state that saturation plane is dry, (need record the water-intake rate of pottery sand used in advance, and deduct in external adding water); Again quartz sand and powder are added in agitator kettle, dry mixing 2min, then steel fiber is added slowly, dry mixing 2min, then in whipping process, add water and high efficiency water reducing agent, stir 3min, then add the epoxy resin ingredient stirring 3min mixed, finally in whipping process, slowly add organic fibre to guarantee that fiber can be uniformly distributed, stir 5min; The termination of churning time is not agglomerating with fiber slurry, lump for basis for estimation, to ensure the abundant dispersion of fiber, i.e. and obtained lightweight high tenacity cement-base composite material.
(2) the mating formation of lightweight high tenacity cement-base composite material
1) before construction by all need equipment enter armed state in advance one deck interface adhesive is sprayed to bridge beam slab.
2) utilize concrete tank that the lightweight high tenacity cement-base composite material prepared is transported to working-yard, directly pour into and install in the road groove of side form, manually make up a deficiency evenly, as found that there is segregation phenomenon, application spade turns.
3) vibrate with shock club immediately after having paved, after vibrating gauge control be 6cm, then carry out striking off, the operation such as mechanical troweling, last covered with plastic film, evaporate to suppress the moisture on its surface, reach minimizing and even eliminate plastic cracking, improve visual appearance, improve the object of endurance quality.
The performance test of cement-base composite material prepared by the present embodiment, records according to " highway engineering cement and cement concrete testing regulation " (JTG E30-2005): 28d ultimate compression strength 91MPa; 28d folding strength 14MPa; Unit weight actual measurement 2030kg/m
3; Fatigue lifetime 2,130,000 times; Fracture toughness property index η 30=31,28d shrinking percentage is 7.2 × 10
-4.
Embodiment 2
Batching (counting by weight): PO52.5 silicate cement 849, quartz sand (fineness modulus 1.5) 339, (fineness modulus is 3.1, tap density 800kg/m to pottery sand
3, water-intake rate 10%) and 215, II level flyash 226, (at 0.1 μm, specific surface area is particle diameter silicon ash: 20m
2/ g) 56, water 295, polycarboxylate water-reducer 13, steel fiber (length is 25mm) 40, polyvinyl alcohol fiber (11mm, density 1.3g/cm
3) 13, the mixture 30 of non-ion aqueous epoxy resin (epoxy equivalent (weight) 195 ± 5) and polyamine curing agent (active hydrogen equivalent weight 400 ± 5).
Preparation method is with embodiment 1.
Mating formation of lightweight high tenacity cement-base composite material:
1) before construction by all need equipment enter armed state in advance one deck interface adhesive is sprayed to bridge beam slab.
2) utilize concrete tank that the lightweight high tenacity cement-base composite material prepared is transported to working-yard, directly pour into and install in the road groove of side form, manually make up a deficiency evenly, as found that there is segregation phenomenon, application spade turns.
3) vibrate with shock club immediately after having paved, after vibrating gauge control be 8cm, then carry out striking off, the operation such as mechanical troweling, last covered with plastic film, evaporate to suppress the moisture on its surface, reach minimizing and even eliminate plastic cracking, improve visual appearance, improve the object of endurance quality.
The performance test of main raw prepared by the present embodiment, records according to " highway engineering cement and cement concrete testing regulation " (JTGE30-2005): 28d ultimate compression strength 83MPa; 28d folding strength 11MPa; Actual measurement unit weight 1950kg/m
3; Fatigue lifetime 2,090,000 times; Fracture toughness property index η 30=27,28d shrinking percentage is 5.8 × 10
-4.
Embodiment 3
Batching (counting by weight): PO52.5 silicate cement 860, quartz sand (fineness modulus 1.5) 380, (fineness modulus is 3.5, tap density 850kg/m to pottery sand
3, water-intake rate 12%) and 245, II level flyash 150, (at 0.2 μm, specific surface area is particle diameter silicon ash: 25m
2/ g) 40, water 280, polycarboxylate water-reducer 10, steel fiber (length is 30mm) 50, polyvinyl alcohol fiber (12mm, density 1.3g/cm
3) 13, the mixture 25 of bisphenol A epoxide resin (epoxy equivalent (weight) 195 ± 5) and polyamine curing agent (active hydrogen equivalent weight 400 ± 5).
Preparation method is with embodiment 1.
Method for paving is with embodiment 2.
The performance test of main raw prepared by the present embodiment, records according to " highway engineering cement and cement concrete testing regulation " (JTGE30-2005): 28d ultimate compression strength 85MPa; 28d folding strength 12MPa; Actual measurement unit weight 2000kg/m
3; Fatigue lifetime 2,210,000 times; Fracture toughness property index η 30=29; 28d shrinking percentage is 6.4 × 10
-4.
Claims (7)
1. a steel box girder bridge face cement-base composite material, is characterized in that the proportioning of each component is counted by weight:
Cement 849 ~ 881,
Quartz sand 339 ~ 425,
Pottery sand 215 ~ 273,
Flyash 100 ~ 226,
Silicon ash 30 ~ 56,
Water 275 ~ 295,
Water reducer 10 ~ 13,
Steel fiber 40 ~ 80,
Organic fibre 6.5 ~ 13,
Epoxy resin composition 20 ~ 30,
Wherein, described epoxy resin composition is the mixture of the epoxy resin that adds when preparing of cement-base composite material and solidifying agent thereof, epoxy resin selects bisphenol A epoxide resin or non-ion aqueous epoxy resin, epoxy equivalent (weight) 195 ± 5, solidifying agent is polynary amine curing agent, active hydrogen equivalent weight 400 ± 5; Described organic fibre is polyvinyl alcohol fiber; The fineness modulus of described pottery sand is 3.1 ~ 3.7, tap density 800-900kg/m
3, water-intake rate 10-15%; The fineness modulus 1.0 ~ 1.5 of described quartz sand;
Described steel box girder bridge face cement-base composite material is adopted and is prepared with the following method:
1) epoxy resin and solidifying agent thereof are mixed, obtain epoxy resin ingredient for subsequent use; Pottery sand is soaked in water, makes it fully absorb water saturated, take out and dry in the air to saturated dry surface;
2) after cement, quartz sand, pottery sand, flyash, silicon ash are fed intake, add water and water reducer, be uniformly mixed, add the epoxy resin ingredient mixed again, be uniformly mixed, finally add polyvinyl alcohol fiber, being stirred to fiber can equally distributed state.
2. cement-base composite material as claimed in claim 1, is characterized in that cement selection PO 52.5 silicate cement in component.
3. cement-base composite material as claimed in claim 1, is characterized in that described flyash is II level flyash or I level flyash; Described silicon ash median size is at 0.1 ~ 0.3 μm, and specific surface area is: 20 ~ 28m
2/ g.
4. cement-base composite material as claimed in claim 1, is characterized in that described water reducer is naphthalene water reducer or polycarboxylate water-reducer.
5. cement-base composite material as claimed in claim 1, it is characterized in that described steel fiber is the carbon element cold-drawn wire cut-out type of multi-anchor fixed point, length is 25 ~ 35mm.
6. cement-base composite material as claimed in claim 1, is characterized in that described polyvinyl alcohol fiber length 11 ~ 13mm, density 1.3g/cm
3.
7. the method for paving of the cement-base composite material described in any one of claim 1 to 6, is characterized in that comprising the following steps:
1) in advance one deck interface adhesive is sprayed to steel box girder bridge beam slab;
2) utilize concrete tank that the lightweight high tenacity cement-base composite material prepared is transported to working-yard, directly pour into and install in the road groove of side form, manually make up a deficiency;
3) vibrate with shock club immediately after having paved, it is 6 ~ 8cm that material thickness controls, and strikes off, mechanical troweling, last covered with plastic film.
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| CN111549648B (en) * | 2020-04-10 | 2022-04-08 | 哈尔滨工业大学 | High-toughness combined beam and construction method thereof |
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| CN113200728A (en) * | 2021-06-25 | 2021-08-03 | 洛阳理工学院 | High-strength and high-durability cement-based premix material and preparation method thereof |
| CN113831086B (en) * | 2021-10-10 | 2022-11-08 | 斯博锐精细化学品(广东)有限公司 | Ultrahigh-toughness concrete and preparation method thereof |
| CN115572110A (en) * | 2022-10-08 | 2023-01-06 | 新特新材料集团(河南)股份有限公司 | Bridge deck waterproof paving premix |
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