CN112047696B - Tunnel cable trench RPC cover plate and preparation method thereof - Google Patents
Tunnel cable trench RPC cover plate and preparation method thereof Download PDFInfo
- Publication number
- CN112047696B CN112047696B CN202010970583.6A CN202010970583A CN112047696B CN 112047696 B CN112047696 B CN 112047696B CN 202010970583 A CN202010970583 A CN 202010970583A CN 112047696 B CN112047696 B CN 112047696B
- Authority
- CN
- China
- Prior art keywords
- cover plate
- parts
- cable trench
- tunnel cable
- steel fiber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
- C04B14/48—Metal
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention provides an RPC cover plate for a tunnel cable trench and a preparation method thereof, wherein the cover plate comprises the following components in parts by weight: 200 parts of 100-containing cement, 200 parts of 150-containing mineral powder, 120 parts of 100-containing fly ash, 2-26 parts of quartz sand, 1-3 parts of modified steel fiber, 0.2-0.8 part of water reducing agent, 0.3-0.5 part of flame retardant, 0.1-0.4 part of penetrating crystallizing agent, 0.5-1 part of modified rubber particle and 200 parts of 120-containing water; the specific mixing amount of the modified steel fiber is designed according to the breaking strength, so that the strength of the concrete is obviously improved, a test piece is broken without scattering, and the extensibility is good, so that the thin and short steel fiber improves the bending strength of the concrete, and the high brittleness of common concrete is effectively overcome; the invention can effectively reduce the dead weight of the structure cover plate and improve the characteristics of durability, fire resistance, high strength, high toughness and the like of the structure cover plate.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to an RPC cover plate for a tunnel cable trench and a preparation method of the RPC cover plate.
Background
The active powder concrete plate is composed of high-strength cement and a blending material, can be widely applied to cable duct cover plates, steel structures, stair pedals and the like in constructional engineering, and is the key point in the field of engineering materials. The application of the active powder concrete in the engineering structure can solve the defects of insufficient tensile strength, large brittleness, poor volume stability and the like of the existing high-strength and high-performance concrete, and can also solve the problems of high investment, easy corrosion and the like of a steel structure. The existing tunnel cable trench RPC cover plate is low in strength, poor in stability and durability, cracks are prone to appearing on the surface, and the requirement on impermeability is strict, so that the use of the cable trench RPC cover plate is limited.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an RPC cover plate for a tunnel cable trench and a preparation method thereof.
In order to achieve the above purpose, the solution of the invention is as follows:
the tunnel cable trench RPC cover plate comprises the following raw material components in parts by weight:
100 portions of cement and 200 portions of cement,
150 portions by weight of 200 portions of mineral powder,
100 portions of fly ash and 120 portions of fly ash,
2-26 parts of quartz sand,
1-3 parts of modified steel fiber,
0.2 to 0.8 portion of water reducing agent,
0.3 to 0.5 portion of flame retardant,
0.1 to 0.4 portion of osmotic crystallizing agent,
0.5-1 part of modified rubber particles;
water 120-.
As a preferred embodiment of the present invention, the cement is ordinary portland cement.
As a preferred embodiment of the invention, the specific surface area of the ore powder is 350-2/kg。
As a preferred embodiment of the invention, the fly ash has a particle size of 20-30 μm and a silica content of 85-90%.
As a preferred embodiment of the present invention, the silica sand has an average particle diameter of 300-400 μm and a bulk density of 1-20 mesh of 1.5-1.7g/cm3。
As a preferred embodiment of the present invention, the modified steel fiber is a polytetrafluoroethylene modified steel fiber, and the specific modification method is as follows: 1-2 parts by weight: 3-5:100 of carbon fiber, steel fiber and polytetrafluoroethylene are uniformly mixed in a high-speed mixer, then are sintered for 10-30 minutes in a muffle furnace at the temperature of 120-200 ℃, and are crushed into particles with the diameter of 0.15-0.2mm and the length of 3-12mm after being cooled.
As a preferred embodiment of the invention, the water reducing agent is polycarboxylic acid type high performance water reducing agent powder with the bulk density of 300-400kg/m3The water reducing rate is more than or equal to 30 percent.
As a preferred embodiment of the invention, the flame retardant is a phosphorus-containing three-phase composite intumescent flame retardant, specifically an ammonium polyphosphate/pentaerythritol/zinc borate system, and the weight ratio is 3:1:1-4:2: 1.
As a preferred embodiment of the present invention, the osmotic crystallization agent is sodium carbonate or sodium silicate.
As a preferred embodiment of the invention, the modified rubber particles are regenerated rubber particles made from waste tires, and the particle size is 5-80 meshes.
As a preferred embodiment of the invention, the preparation method of the RPC cover plate of the tunnel cable trench comprises the following steps:
(1) adding cement, mineral powder, fly ash, quartz sand, modified steel fiber, a flame retardant, modified rubber particles and a permeable crystallization agent into a stirrer for mixing, adding a water reducing agent and water, and uniformly stirring to obtain concrete slurry;
(2) injecting the concrete slurry into a mold, standing for 5-7h at room temperature, then placing into a curing room, introducing steam at the temperature of 20-22 ℃ and the relative humidity of more than 95%, raising the temperature at the speed of 10 ℃/h until the temperature reaches 35-45 ℃, taking out after curing for 20-30h, and cooling at room temperature;
(3) and after the mold of the test piece is removed, moving the test piece into a high-temperature curing chamber, slowly raising the temperature to 350 ℃ at a constant speed within 6 hours, curing at a constant temperature for 24 hours, and after the test piece is slowly cooled to the room temperature, performing standard curing for 30 days. The thickness of the cover plate is 25-40 mm.
Wherein in the step (1), the rotating speed of the stirrer is 255 +/-10 r/min, and the time is 15-20 min.
Due to the adoption of the scheme, the invention has the beneficial effects that:
firstly, the modified steel fiber is adopted, the steel fiber, the carbon fiber and the polytetrafluoroethylene are uniformly mixed in a high-speed mixer, and then the mixture is placed in a muffle furnace for sintering, so that the polytetrafluoroethylene can be coated on the steel fiber, the cohesiveness with aggregates such as cement, mineral powder, fly ash and the like is improved, when a product is prepared, the product strength is enhanced, meanwhile, cracks on the surface of the product are avoided, the strength of concrete is obviously improved, the test piece is guaranteed to crack but not scatter when damaged, the extensibility is good, therefore, the fine and short modified steel fiber improves the bending strength of the concrete, and the fine and short modified steel fiber is compounded with modified rubber particles, so that the high brittleness of common concrete is effectively overcome.
Secondly, when the stability of the fly ash is enhanced, a fluxing agent needs to be added, sodium carbonate is a good additive, and the sodium carbonate can ensure that the stability of the material is improved under the condition of reducing the melting temperature in the range of optional components. In addition, the fly ash is added, so that the viscosity of the concrete is reduced, the fluidity of the slurry is increased, and the concrete is more easily compacted.
And thirdly, carbonate ions released by the penetrating crystallizing agent react with calcium ions released by cement in a hydration process to generate calcium carbonate crystals, so that the aims of crack filling and pore filling are fulfilled, and the effects of water resistance and densification are realized.
Fourthly, the quartz sand has high hardness and excellent interface performance, is easy to collect and low in price, mainly has the function of aggregate in the active powder concrete, and improves the homogeneity of the concrete by multi-stage aggregate preparation; in addition, the reactive powder concrete has compact internal structure, few defects and light weight, can reduce the self weight of the structure and accords with the development direction of structural materials.
In a word, the invention can effectively reduce the dead weight of the structure cover plate and improve the characteristics of the structure cover plate such as durability, fire resistance, high strength, high toughness and the like.
Detailed Description
The invention provides an RPC cover plate for a tunnel cable trench and a preparation method thereof.
The present invention will be further described with reference to examples and comparative examples.
The composition of examples and comparative examples is shown in Table 1.
TABLE 1 weight part data of components in each example and comparative example
Specific parameters of each component in examples and comparative examples are shown in table 2. Wherein the modified steel fiber is a polytetrafluoroethylene modified steel fiber, and the specific modification method comprises the following steps: mixing the following components in parts by weight: 4: 100 carbon fibers, steel fibers and polytetrafluoroethylene are uniformly mixed in a high-speed mixer, then are sintered for 15 minutes in a muffle furnace at the temperature of 150 ℃, and are crushed into particles with the diameter of 0.15-0.2mm and the length of 3-12mm after being cooled; the water reducing agent is polycarboxylic acid high-performance water reducing agent powder; the flame retardant is a mixture of ammonium polyphosphate/pentaerythritol/zinc borate.
TABLE 2 specific parameters of the examples and comparative examples
The preparation method of the RPC cover plate of the tunnel cable trench in the embodiment comprises the following steps:
(1) adding cement, mineral powder, fly ash, quartz sand, modified steel fiber, a flame retardant, modified rubber particles and a permeable crystallization agent into a stirrer, mixing at the rotating speed of 255r/min for 15min, adding a water reducing agent and water, and uniformly stirring to obtain concrete slurry;
(2) injecting the concrete slurry into a mold, standing for 5h at room temperature, then placing into a curing room, introducing steam, raising the temperature at the speed of 10 ℃/h until the temperature reaches 35 ℃, curing for 20h, taking out, and cooling at room temperature;
(3) and after removing the mold, moving the test piece into a high-temperature curing chamber, slowly raising the temperature to 300 ℃ at a constant speed within 6 hours, curing at a constant temperature for 24 hours, and after slowly cooling to room temperature, performing standard curing for 30 days.
The whole production process in the preparation method is simple, and the production process can completely ensure the quality of the concrete cover plate product through standing, initial curing (curing with a mold), mold removal, final curing (demolding curing) and natural curing.
Comparative example 1
This comparative example was compared to example 2 without the addition of the modified steel fibers, and the remainder was the same as example 2.
Comparative example 2
This comparative example was compared with example 2, and the same as example 2 except that no modified rubber particles were added.
Comparative example 3
This comparative example was compared to example 2, with the addition of ordinary steel fibers, and the remainder was the same as example 2.
The tunnel cable trench RPC cover plates of the examples and comparative examples were subjected to the following performance tests, as shown in table 3.
TABLE 3 cover plate Performance data for the examples and comparative examples
As can be seen from Table 3, the tunnel cable trench RPC cover plate prepared by the method has excellent compressive strength, flexural strength and impermeability, meanwhile, the product meets the test requirements of cavities, honeycomb pitted surfaces, surface cracks and the like, and can meet the use requirements of the tunnel cable trench RPC cover plate, the modified steel fibers are not used in comparative example 1, the common steel fibers are used in comparative example 3, the surface cracks, the honeycomb pitted surfaces and the like of the product are not qualified, the compressive strength, the flexural strength and the impermeability are difficult to meet the requirements, and the honeycomb pitted surfaces are not qualified, and the compressive strength, the flexural strength and the impermeability are reduced to a certain extent when the modified rubber particles are not added in comparative example 2.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. It will be readily apparent to those skilled in the art that various modifications to these embodiments and the generic principles defined herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above-described embodiments. Those skilled in the art should appreciate that many modifications and variations are possible in light of the above teaching without departing from the scope of the invention.
Claims (8)
1. The utility model provides a tunnel cable trench RPC apron which characterized in that: the composite material comprises the following raw material components in parts by weight:
100 portions of cement and 200 portions of cement,
150 portions by weight of 200 portions of mineral powder,
100 portions of fly ash and 120 portions of fly ash,
2-26 parts of quartz sand,
1-3 parts of modified steel fiber,
0.2 to 0.8 portion of water reducing agent,
0.3 to 0.5 portion of flame retardant,
0.1 to 0.4 portion of osmotic crystallizing agent,
0.5 to 1 portion of modified rubber particles,
water 120-;
the modified steel fiber is a polytetrafluoroethylene modified steel fiber, and the specific modification method comprises the following steps: 1-2 parts by weight: 3-5, uniformly mixing 100 parts of carbon fiber, steel fiber and polytetrafluoroethylene in a high-speed mixer, sintering in a muffle furnace at the temperature of 120-200 ℃ for 10-30 minutes, cooling, and crushing into particles with the diameter of 0.15-0.2mm and the length of 3-12 mm;
the modified rubber particles are regenerated rubber particles prepared from waste tires, and the particle size is 5-80 meshes.
2. The RPC cover plate for a tunnel cable trench of claim 1, wherein: the cement is ordinary portland cement; the specific surface area of the mineral powder is 350-400m2/kg。
3. The RPC cover plate for a tunnel cable trench of claim 1, wherein: the particle size of the fly ash is 20-30 mu m, and the content of silicon dioxide is 85-90%; the average particle size of the quartz sand is 300-400 mu m, and the bulk density of 1-20 meshes is 1.5-1.7g/cm3。
4. The RPC cover plate for a tunnel cable trench of claim 1, wherein: the water reducing agent is polycarboxylic acid high-performance water reducing agent powder with the bulk density of 300-400kg/m3The water reducing rate is more than or equal to 30 percent.
5. The RPC cover plate for a tunnel cable trench of claim 1, wherein: the flame retardant is a phosphorus-containing three-phase composite intumescent flame retardant, specifically an ammonium polyphosphate/pentaerythritol/zinc borate system, and the weight ratio is 3:1:1-4:2: 1.
6. The RPC cover plate for a tunnel cable trench of claim 1, wherein: the penetrating crystallization agent is sodium carbonate or sodium silicate.
7. The method for preparing the RPC cover plate of the tunnel cable trench according to claim 1, wherein the RPC cover plate comprises the following steps: the method specifically comprises the following steps:
(1) adding cement, mineral powder, fly ash, quartz sand, modified steel fiber, a flame retardant, modified rubber particles and a permeable crystallization agent into a stirrer for mixing, adding a water reducing agent and water, and uniformly stirring to obtain concrete slurry;
(2) injecting the concrete slurry into a mold, standing for 5-7h at room temperature, then placing into a curing room, introducing steam at the temperature of 20-22 ℃ and the relative humidity of more than 95%, raising the temperature at the speed of 10 ℃/h until the temperature reaches 35-45 ℃, taking out after curing for 20-30h, and cooling at room temperature;
(3) and after the mold of the test piece is removed, moving the test piece into a high-temperature curing chamber, slowly raising the temperature to 350 ℃ at a constant speed within 6 hours, curing at a constant temperature for 24 hours, and after the test piece is slowly cooled to the room temperature, performing standard curing for 30 days.
8. The RPC cover plate for a tunnel cable trench of claim 7, wherein: in the step (1), the rotating speed of the stirrer is 255 +/-10 r/min, and the time is 15-20 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010970583.6A CN112047696B (en) | 2020-09-15 | 2020-09-15 | Tunnel cable trench RPC cover plate and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010970583.6A CN112047696B (en) | 2020-09-15 | 2020-09-15 | Tunnel cable trench RPC cover plate and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112047696A CN112047696A (en) | 2020-12-08 |
| CN112047696B true CN112047696B (en) | 2022-04-26 |
Family
ID=73604236
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010970583.6A Active CN112047696B (en) | 2020-09-15 | 2020-09-15 | Tunnel cable trench RPC cover plate and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112047696B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100869969B1 (en) * | 2007-07-06 | 2008-11-21 | (주)우암건설 | Manhole repair method |
| 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 |
| CN104355584A (en) * | 2014-10-24 | 2015-02-18 | 上海宝田新型建材有限公司 | Cementitious capillary crystalline waterproofing building material |
| CN105907001A (en) * | 2016-06-23 | 2016-08-31 | 安徽荣达阀门有限公司 | Activation-treated carbon fiber and steel fiber-modified polytetrafluoroethylene material and preparation method thereof |
| CN108585710A (en) * | 2018-05-11 | 2018-09-28 | 义乌工商职业技术学院 | A kind of construction material and preparation method thereof |
-
2020
- 2020-09-15 CN CN202010970583.6A patent/CN112047696B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100869969B1 (en) * | 2007-07-06 | 2008-11-21 | (주)우암건설 | Manhole repair method |
| 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 |
| CN104355584A (en) * | 2014-10-24 | 2015-02-18 | 上海宝田新型建材有限公司 | Cementitious capillary crystalline waterproofing building material |
| CN105907001A (en) * | 2016-06-23 | 2016-08-31 | 安徽荣达阀门有限公司 | Activation-treated carbon fiber and steel fiber-modified polytetrafluoroethylene material and preparation method thereof |
| CN108585710A (en) * | 2018-05-11 | 2018-09-28 | 义乌工商职业技术学院 | A kind of construction material and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112047696A (en) | 2020-12-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111056815B (en) | Slow-setting high-toughness magnesium phosphate cement road rapid repair material | |
| CN110790552B (en) | Waste brick regenerated ultrahigh-toughness mixture and preparation method and application thereof | |
| CN110922132A (en) | Light-weight ultrahigh-strength concrete and preparation method thereof | |
| CN112408829B (en) | Solid waste reclaimed sand and preparation method and application thereof | |
| CN115159944A (en) | Industrial solid waste soft clay curing agent and resource utilization method thereof | |
| CN111875405A (en) | Graphite tailing foam concrete and preparation method thereof | |
| CN111807769A (en) | Slag-based highway grouting material and preparation method thereof | |
| CN114890705A (en) | Micro silicon powder-based composite excitant for geopolymer grouting material and preparation method thereof | |
| CN115321890A (en) | Solid waste base binder for carbon dioxide sequestration, preparation method and carbon dioxide sequestration method thereof | |
| CN111333377A (en) | High-tensile-strength concrete and preparation method thereof | |
| CN108529925B (en) | Anti-cracking early strength agent for shield segment concrete and use method thereof | |
| CN112047696B (en) | Tunnel cable trench RPC cover plate and preparation method thereof | |
| CN114477873B (en) | Recycled aggregate self-compacting concrete and preparation method thereof | |
| CN111574143A (en) | Formula of low-shrinkage artificial inorganic stone and preparation method thereof | |
| CN108609988B (en) | Method for producing aerated concrete building block by using fluorite beneficiation waste residue-quartz tailings | |
| CN116621529A (en) | Carbonized foam concrete and preparation method and application thereof | |
| CN116161929A (en) | Recycled concrete and preparation method thereof | |
| CN112062514B (en) | Method for preparing 3D printing ink from waste 3D printing concrete | |
| CN116143484A (en) | Mine filling material based on coal gas slag, and preparation method and application thereof | |
| CN115093138B (en) | Additive suitable for silicothermic magnesium-smelting slag-based cementing material and application thereof | |
| CN115010455B (en) | High-performance full-solid waste concrete and preparation method thereof | |
| CN115849781B (en) | Geopolymer cementing material based on multiple solid wastes and preparation method thereof | |
| CN113636772B (en) | Steel slag-based heat-insulating filler and preparation method and application thereof | |
| CN117383903B (en) | High-toughness early-strength repair material with high solid waste doping amount, preparation method and application | |
| CN115583827B (en) | Plastic early-strength type synchronous grouting material for shield tunnel and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |