CN105130337A - Cement-based engineering composite railway sidewalk cover board preparation process and product - Google Patents
Cement-based engineering composite railway sidewalk cover board preparation process and product Download PDFInfo
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- CN105130337A CN105130337A CN201510532172.8A CN201510532172A CN105130337A CN 105130337 A CN105130337 A CN 105130337A CN 201510532172 A CN201510532172 A CN 201510532172A CN 105130337 A CN105130337 A CN 105130337A
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Abstract
The invention discloses a cement-based engineering composite railway sidewalk cover board preparation process and a product, and the preparation process is used for preparing light-weight high-strength railway sidewalk cover boards. The raw materials comprise the following components in parts by weight: 100 parts of cement, 10-60 parts of coal ash, 5-20 parts of silica fume, 1.0-2.0 parts of water reducer, 1.0-2.0 parts of polyvinyl alcohol fiber, 0.1-0.5 parts of polyvinyl alcohol fiber and 20-50 parts of silica sand. The product is formed under the frequency of 3000 Hz and the amplitude of 1mm, steaming under 40 DEG C or submerging 7d for maitenance is carried out, and then ordinary maintenance is carried out to obtain the high-performance target product. According to the process, the obtained cover board has excellent property, the shock resistance, crack resistance and corrosion resistance are greatly improved, the 28d bending strength can reach more than or equal to 18 MPa, the 28d pressure resistance is more than or equal to 75 MPa, and 56d electric flux is less than or equal to 100 C. The the shock resistance, crack resistance and corrosion resistance of the cover board are greatly improved, and the cover board is light in weight and high in strength, convenient in installation and free of electric conduction or hand prick.
Description
Technical field
The present invention relates to building slab, especially relate to cement based engineered composite material railway walkway cover plate preparing technical field.
Background technology
In recent years, China Express Railway is fast-developing, on the basis of a large amount of high-speed railway circuits built up, still has a large amount of branch railway line, inter-city passenger rail, subway line planning at present and builds, being about to the new upsurge starting railway construction.When high-speed railway or Passenger dedicated railway Bridge employing monoblock type walkway baffle plate, because oscillatory load, wind-force and train parting carry comparatively large, make baffle dimensions large, conduct oneself with dignity heavier; Walkway cover plate will bear corresponding load as the moving passage of Passenger dedicated railway Bridge inspection trolley, need increase its cross-sectional height, and deadweight also will strengthen.Line for Passenger Transportation bridge floor facility is many, and the combination of various facility makes the secondary dead load that is laid on bridge floor heavier, causes the increase such as to creep of bridge.
If railway walkway baffle plate, cover plate adopt the RPC (ReactivePowderConcrete of high strength, high tensile, or cement based engineered composite material (EngineeringCement-basedComposites RPC), ECC), can greatly alleviate bridge floor secondary dead load, alleviate installation difficulty, and can ensure that in use component does not ftracture, globality is better, can meet use properties and the weather resistance of component well.China mainly uses RPC as the material of railway walkway baffle plate, cover plate at present, but in the use of RPC, exposes the shortcoming that they are a large amount of, and the ECC railway walkway baffle plate of development of new, cover plate are very necessary.
First be the conductivity issues of RPC.In specification " RPC (RPC) material railway walkway baffle plate, cover plate ", the folding strength>=18MPa of regulation RPC, for reaching this requirement, existing RPC mixes 80 ~ 120kg/m in proportioning
3steel fiber, steel fibers a large amount of so easily forms overlap joint wherein, final forms conductive network structure, when wherein steel fiber by dispersion and proportioning control bad time all the more so, there is this phenomenon at the scene at present, bring great potential safety hazard.
The problem of rustiness of steel fiber in addition.According to existing specification, get rusty for preventing the steel fiber in RPC, the steel fiber that RPC uses is required to be copper plated steel fiber, but because RPC adopts ultralow water cement ratio, it is caused to stir with shaping very difficult, need are long-time, high strength forced action type stirs more than ten minutes, the copper plate of steel fiber surface is easily caused to wear and tear, steel fiber is directly exposed in cement matrix the most at last, again due to walkway baffle plate and cover plate thinner, thickness is only 2.5 ~ 5.0cm, and therefore steel fiber is easily by corrosion, and normal naked eyes both can see the rusty stain of steel fiber at the scene.
Steel fiber is also had to prick the hand problem.Owing to mixing a large amount of steel fiber in RPC, the elongate steel fiber come out easily is pricked the hand, when no matter being RPC production, or during the installation of RPC, often can see that workman's hand is pricked hemorrhage, cause producing, installation effectiveness declines, and bring CR Critical human safety issues, owing to need lift plate etc. of uncapping during trouble shooting, therefore this also causes the trouble shooting of railway cable in the future etc. very inconvenient, the on-the-spot a large amount of complaints having received this kind of problem.
In addition, RPC, owing to adopting high-temperature steam curing, causes cement-hydrate fragility excessive, also has fragility too strong, the problem of brittle failure easily occurs; Because steel fiber density is 7.9g/m
3, cause RPC density excessive, monolithic cover plate is heavier, causes installation, maintenance, the larger problem of transhipment difficulty; Mix a large amount of steel fiber, and adopt 80 DEG C of vapor cures, cause material and the too high problem of production cost etc.
Cement based engineered composite material (EngineeringCement-basedComposites, ECC) be the new technology that development in recent years is got up, its objective is by being mixed with organic fiber in a large number to solve the brittleness problems of cement-based material, its mechanical property has the feature such as strain hardening, large ultimate strain, high impact-resistant toughness, high cracking resistance, it is high 10 ~ 100 times that the strain of its ultimate tensile can reach portland cement concrete.Effectively avoid the shortcomings of RPC, can be used for the cable trough of high-speed railway, cable trough cover boards, contact system column, wind and sound barrier, bridge floor railing, roadbed fence, CP III locating point etc.In China Express Railway fast development, and under the background of going abroad, there is higher propagation and employment and be worth.
Summary of the invention
In view of the above deficiency of prior art, the object of the invention is to obtain a kind of shock resistance, cracking resistance, resistance to corrosion greatly increase, and high-strength light, easy for installation, cement based engineered composite material railway walkway cover plate that is non-conductive, that do not prick the hand and preparation technology thereof, to meet the high-strength technical requirements of light weight that high-speed rail bridge section lays.
Object of the present invention is realized by following technique means
Cement based engineered composite material railway walkway cover plate preparation technology, for the preparation of light-high-strength railway walkway cover plate, it is characterized in that, shared by raw materials used each composition, weight part is: cement: 100 parts, flyash: 10 ~ 60 parts, silicon ash: 5 ~ 20 parts, water reducer: 1.0 ~ 2.0 parts, polyvinyl alcohol fiber: 1.0 ~ 2.0 parts, polyethylene fibre: 0.1 ~ 0.5 part, quartz sand: 20 ~ 50 parts;
Be 3000Hz in frequency, amplitude is 1mm condition compacted under, and at 40 DEG C steam or curing in water 7d, obtained high performance target product after then carrying out common maintenance.
The present invention also aims to obtain a kind of cement based engineered composite material railway walkway cover plate, adopt processing method as above to obtain, performance index are: 28 days folding strength 18.9MPa, 28 days ultimate compression strength 81.3MPa, 56d displacement flux 102 coulombs, shock resistance number of times 5190.
Adopt the obtained cover plate 28d folding strength of method of the present invention can reach >=18MPa, 28d ultimate compression strength >=75MPa, 56d displacement flux≤100C.Made baffle plate and cover plate have very excellent properties, and shock resistance, cracking resistance, resistance to corrosion greatly increase, and high-strength light, easy for installation, non-conductive, do not prick the hand.
Embodiment
Enforcement of the present invention of becoming a partner below is further described.But it is emphasized that embodiment is below exemplary, instead of in order to limit the scope of the invention and apply.
The present invention is raw materials used should meet some requirements: cement is alkali portland cement, and its 28d intensity should be greater than 42.5MPa, and its alkali content should be less than 0.6%, and chloride ion content should be less than 0.06%.Flyash is the thin ash that power plant collects from flue gas, and its quality is I grade.
Silicon ash is ferroalloy works in smelting duriron and industrial silicon, Pure Silicon Metal process, by a large amount of volatility SiO produced in electrothermal stove
2with the product of Si gas after oxidation, condensation, precipitation, its surface-area answers>=20000m
2/ kg, activity index answers>=95%.
Water reducer is poly carboxylic acid series water reducer, and its water-reducing rate answers >=25%.
Polyvinyl alcohol fiber is common engineering fiber, Fibre diameter 10 ~ 14 μm, tensile strength >=1200MPa, Young's modulus >=30GPa, length 4 ~ 12mm, elongation at break >=3.5%.
Polyethylene fibre is enhanced fiber, Fibre diameter 8 ~ 14 μm, tensile strength >=2000MPa, Young's modulus >=45GPa, length 4 ~ 12mm, elongation at break >=3.5%.
Quartz sand is the common quartz sand after quartzite fragmentation, and fineness is 100 ~ 200 orders, SiO
2content>=95%.
Embodiment.
Cement based engineered composite material (ECC) the railway walkway baffle plate of the present embodiment, the raw material composition of cover plate weight part:
Cement: 100 parts
Silicon ash: 20 parts
Flyash: 130 parts
Water reducer: 1 part
Polyvinyl alcohol fiber: 3 parts
Polyethylene fibre: 2 parts
Quartz sand: 100 parts.
Whipping procedure is: first reinforcing body material, stirs 1 minute, then adds water and liquid material, stirs 1 minute, finally adds fiber again, stirs 5 minutes; Then spend curing in water 7 days at 40 DEG C, then carry out normal curing 28 days.Obtaining ECC performance index is: 28 days folding strength 18.9MPa, 28 days ultimate compression strength 81.3MPa, 56d displacement fluxes 102 coulombs, shock resistance number of times 5190.
Above to describe with manufacturing object be that railway walkway cover plate launches, but the solution of the present invention is applied to other appurtenants on railway walkway, as railway walkway baffle plate should without substantial obstacle.
Claims (9)
1. a cement based engineered composite material railway walkway cover plate preparation technology, for the preparation of light-high-strength railway walkway cover plate, it is characterized in that, shared by raw materials used each composition, weight part is: cement: 100 parts, flyash: 10 ~ 60 parts, silicon ash: 5 ~ 20 parts, water reducer: 1.0 ~ 2.0 parts, polyvinyl alcohol fiber: 1.0 ~ 2.0 parts, polyethylene fibre: 0.1 ~ 0.5 part, quartz sand: 20 ~ 50 parts;
Be 3000Hz in frequency, amplitude is 1mm condition compacted under, and at 40 DEG C steam or curing in water 7d, obtained high performance target product after then carrying out common maintenance.
2. cement based engineered composite material railway walkway cover plate preparation technology according to claim 1, it is characterized in that, described cement is alkali portland cement, and its 28d intensity should be greater than 42.5MPa, its alkali content should be less than 0.6%, and chloride ion content should be less than 0.06%.
3. cement based engineered composite material railway walkway cover plate preparation technology according to claim 1, is characterized in that, described flyash is the thin ash that power plant collects from flue gas, and its quality is I grade.
4. cement based engineered composite material railway walkway cover plate preparation technology according to claim 1, is characterized in that, described silicon ash is ferroalloy works in smelting duriron and industrial silicon, Pure Silicon Metal process, by a large amount of volatility SiO produced in electrothermal stove
2with the product of Si gas after oxidation, condensation, precipitation, its surface-area answers>=20000m
2/ kg, activity index answers>=95%.
5. cement based engineered composite material railway walkway cover plate preparation technology according to claim 1, it is characterized in that, described water reducer is poly carboxylic acid series water reducer, and its water-reducing rate answers >=25%.
6. cement based engineered composite material railway walkway cover plate preparation technology according to claim 1, it is characterized in that, described polyvinyl alcohol fiber is common engineering fiber, Fibre diameter 10 ~ 14 μm, tensile strength >=1200MPa, Young's modulus >=30GPa, length 4 ~ 12mm, elongation at break >=3.5%.
7. cement based engineered composite material railway walkway cover plate preparation technology according to claim 1, it is characterized in that, described polyethylene fibre is enhanced fiber, Fibre diameter 8 ~ 14 μm, tensile strength >=2000MPa, Young's modulus >=45GPa, length 4 ~ 12mm, elongation at break >=3.5%.
8. cement based engineered composite material railway walkway cover plate preparation technology according to claim 1, is characterized in that, described quartz sand is the common quartz sand after quartzite fragmentation, and fineness is 100 ~ 200 orders, SiO
2content>=95%.
9. a cement based engineered composite material railway walkway cover plate, it is characterized in that, the processing method of claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8 is adopted to obtain, performance index are: 28 days folding strength 18.9MPa, 28 days ultimate compression strength 81.3MPa, 56d displacement flux 102 coulombs, shock resistance number of times 5190.
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| CN201510532172.8A CN105130337A (en) | 2015-08-26 | 2015-08-26 | Cement-based engineering composite railway sidewalk cover board preparation process and product |
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| CN201510532172.8A CN105130337A (en) | 2015-08-26 | 2015-08-26 | Cement-based engineering composite railway sidewalk cover board preparation process and product |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106800399A (en) * | 2017-03-17 | 2017-06-06 | 中铁第四勘察设计院集团有限公司 | Modified ECC concrete sound barrier panels of a kind of high-strength and high-ductility low viscosity and preparation method thereof |
| CN115594464A (en) * | 2022-10-26 | 2023-01-13 | 华润水泥技术研发有限公司（Cn） | High-strength inorganic quartz stone plate and preparation method thereof |
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| US20050066858A1 (en) * | 2003-09-30 | 2005-03-31 | The Regents Of The University Of Michigan | Sprayable, strain-hardening cementitious compositions |
| US20090075076A1 (en) * | 2007-09-13 | 2009-03-19 | The Regents Of The University Of Michigan | Impact resistant strain hardening brittle matrix composite for protective structures |
| CN101665342A (en) * | 2009-09-18 | 2010-03-10 | 徐世烺 | High-tenacity crack-control impervious fiber concrete |
| CN202039274U (en) * | 2011-04-22 | 2011-11-16 | 北京惠诚基业工程技术有限责任公司 | Sidewalk slab |
| CN102320789A (en) * | 2011-08-29 | 2012-01-18 | 四川西南交大铁路发展有限公司 | High-strength active powder concrete and preparation method |
| CN102910871A (en) * | 2012-11-04 | 2013-02-06 | 西安建筑科技大学 | High-ductility mortar |
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2015
- 2015-08-26 CN CN201510532172.8A patent/CN105130337A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050066858A1 (en) * | 2003-09-30 | 2005-03-31 | The Regents Of The University Of Michigan | Sprayable, strain-hardening cementitious compositions |
| US20090075076A1 (en) * | 2007-09-13 | 2009-03-19 | The Regents Of The University Of Michigan | Impact resistant strain hardening brittle matrix composite for protective structures |
| CN101665342A (en) * | 2009-09-18 | 2010-03-10 | 徐世烺 | High-tenacity crack-control impervious fiber concrete |
| CN202039274U (en) * | 2011-04-22 | 2011-11-16 | 北京惠诚基业工程技术有限责任公司 | Sidewalk slab |
| CN102320789A (en) * | 2011-08-29 | 2012-01-18 | 四川西南交大铁路发展有限公司 | High-strength active powder concrete and preparation method |
| CN102910871A (en) * | 2012-11-04 | 2013-02-06 | 西安建筑科技大学 | High-ductility mortar |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106800399A (en) * | 2017-03-17 | 2017-06-06 | 中铁第四勘察设计院集团有限公司 | Modified ECC concrete sound barrier panels of a kind of high-strength and high-ductility low viscosity and preparation method thereof |
| CN106800399B (en) * | 2017-03-17 | 2020-04-03 | 中铁第四勘察设计院集团有限公司 | High-strength high-toughness low-viscosity modified ECC concrete sound barrier board and preparation method thereof |
| CN115594464A (en) * | 2022-10-26 | 2023-01-13 | 华润水泥技术研发有限公司（Cn） | High-strength inorganic quartz stone plate and preparation method thereof |
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