CN114230262A - Ultrahigh-performance concrete bridge deck and production process thereof - Google Patents
Ultrahigh-performance concrete bridge deck and production process thereof Download PDFInfo
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- CN114230262A CN114230262A CN202111656489.4A CN202111656489A CN114230262A CN 114230262 A CN114230262 A CN 114230262A CN 202111656489 A CN202111656489 A CN 202111656489A CN 114230262 A CN114230262 A CN 114230262A
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- 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
-
- 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/02—Selection of the hardening environment
- C04B40/024—Steam hardening, e.g. in an autoclave
- C04B40/0245—Steam hardening, e.g. in an autoclave including a pre-curing step not involving a steam or autoclave 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
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00293—Materials impermeable to liquids
-
- 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 discloses an ultra-high performance concrete bridge deck and a production process thereof, and the components and the weight ratio are 100 plus or minus 5 parts of cement, 31 plus or minus 3 parts of silica fume, 38 plus or minus 4 parts of fly ash, 169 plus or minus 6 parts of quartz sand, 25 plus or minus 7 parts of steel fiber, 2 plus or minus 1 part of admixture and 29 plus or minus 3 parts of water. The production process comprises the following steps of 1) stirring: stirring by adopting a speed-adjustable forced stirrer to form slurry; 2) molding: pouring the slurry from one side of the mold, standing and solidifying the slurry to form an ultra-high performance concrete blank after pouring, and removing the ultra-high performance concrete blank from the mold after solidification and molding; 3) and (5) maintenance: and curing the ultra-high performance concrete blank according to requirements. The invention has the advantages of high strength, high elastic modulus, high anti-permeability performance and capability of ensuring the safety and stability of track traveling.
Description
Technical Field
The invention belongs to the field of bridge deck track slabs for paving high-speed rails, and particularly relates to an ultrahigh-performance concrete bridge deck and a production process thereof.
Background
Along with the development of economy, China has become the first country of Asian railway mileage, and along with the increase of mileage, the requirement for railway construction is improved. As an important load-bearing member in a railway system, a concrete track slab has become a most widely used concrete member with the largest number of uses. The concrete track slab is safe and reliable, and is the premise of the driving safety and stability of the track. Compared with the rail plate arranged elsewhere, the concrete bridge deck needs to have high strength, high elastic modulus and high impermeability, and the existing concrete rail plate is difficult to meet the requirements.
Disclosure of Invention
The invention aims to solve the technical problem of providing an ultra-high performance concrete bridge deck slab which has high strength, high elastic modulus and high impermeability, thereby fully meeting the paving requirement of the bridge deck slab and ensuring the safety and the stability of track traveling.
In order to solve the technical problem, the components and the weight ratio of the ultra-high performance concrete bridge deck provided by the invention are 100 +/-5 parts of cement, 31 +/-3 parts of silica fume, 38 +/-4 parts of fly ash, 169 +/-6 parts of quartz sand, 25 +/-7 parts of steel fiber, 2 +/-1 part of additive and 29 +/-3 parts of water.
The cement mortar comprises, by weight, 100 +/-2 parts of cement, 31 +/-2 parts of silica fume, 38 +/-1 part of fly ash, 169 +/-2 parts of quartz sand, 25 +/-2 parts of steel fiber, 2 +/-1 part of additive and 29 +/-1 part of water.
The cement mortar comprises, by weight, 100 parts of cement, 31 parts of silica fume, 38 parts of fly ash, 169 parts of quartz sand, 25 parts of steel fiber, 2 parts of an additive and 29 parts of water.
The additive adopts a polycarboxylic acid water reducing agent.
Another technical problem to be solved by the present invention is to provide a process for producing an ultra-high performance concrete bridge deck, which comprises the following steps:
1) stirring: stirring by adopting a speed-adjustable forced stirrer, firstly putting cement, silica fume, fly ash and quartz sand into the stirrer according to a set mass ratio, and stirring for 2-5 min; adding water and an additive in a set mass ratio, and quickly stirring for 3-8min until the water and the additive are fully dispersed and uniformly mixed; then slowly stirring, simultaneously uniformly adding the steel fibers with a set mass ratio, slowly stirring for 2-5min after all the steel fibers are added, and preferably controlling the total stirring time to be 8-15 min to form slurry;
2) molding: pouring the slurry from one side of the mold, tapping the side mold of the mold by using a rubber hammer to remove air bubbles after one-time pouring is finished, standing and solidifying the slurry to form an ultra-high performance concrete blank, and removing the ultra-high performance concrete blank from the mold after solidification and molding;
3) and (5) maintenance: curing the ultra-high performance concrete blank according to the following requirements:
a) after the ultrahigh-performance concrete blank is formed, a plastic film is immediately covered on the surface of the ultrahigh-performance concrete blank to avoid water loss;
b) curing the ultra-high performance concrete blank by adopting steam curing or normal temperature curing; and forming the ultra-high performance concrete bridge deck after the maintenance is finished.
The steel fiber is formed by cutting a steel wire with the tensile strength not less than 2600Mpa, the diameter of the steel fiber is 0.2 +/-10% mm, and the length of the steel fiber is 10-15 mm.
In the step 3), steam curing: standing for 24-30h after pouring, and demoulding; and (3) performing steam curing on the demolded product, putting the ultra-high performance concrete blank into a steam curing room, heating the ultra-high performance concrete blank to 90 +/-1 ℃ at a speed of not more than 15 ℃/h in the steam curing room, keeping the temperature for 45-52h, and then cooling the ultra-high performance concrete blank to 20 +/-5 ℃ at a speed of not more than 15 ℃/h.
And 3), curing at normal temperature: standing for 28-36h after pouring, and demoulding; and (3) curing the demolded product at normal temperature, putting the ultra-high performance concrete blank into a normal temperature curing room or a curing pool, curing for 3-8d, wherein the temperature in the normal temperature curing room is 20 +/-5 ℃, the relative humidity is not lower than 95%, and a non-flowing calcium hydroxide saturated solution is placed in the curing pool, and the temperature of the solution is 20 +/-5 ℃.
After the components and the process are adopted, materials such as silica fume, fly ash and the like are arranged, so that the primarily formed slurry forms a cementing material with high viscosity, sufficient suspension supporting force is ensured, the arranged steel fibers ensure that the track slab has high compressive strength and breaking strength and can be uniformly dispersed in the bridge deck slab, and the whole bridge deck slab has high elastic modulus and high impermeability.
In conclusion, the invention has the advantages of high strength, high elastic modulus, high anti-permeability performance and capability of ensuring the safety and stability of track traveling.
Detailed Description
The invention provides an ultra-high performance concrete bridge deck, which comprises the following components, by weight, 100 +/-5 parts of cement, 31 +/-3 parts of silica fume, 38 +/-4 parts of fly ash, 169 +/-6 parts of quartz sand, 25 +/-7 parts of steel fibers, 2 +/-1 parts of additives and 29 +/-3 parts of water, wherein the steel fibers are formed by cutting steel wires with the tensile strength of not less than 2600Mpa, the diameter of the steel fibers is 0.2 +/-10% mm, and the length of the steel fibers is 10-15 mm.
The invention also provides a production process of the ultra-high performance concrete bridge deck, which comprises the following steps: 1) stirring: stirring by adopting a speed-adjustable forced stirrer, firstly putting cement, silica fume, fly ash and quartz sand into the stirrer according to a set mass ratio, and stirring for 2-5 min; adding water and an additive in a set mass ratio, and quickly stirring for 3-8min until the water and the additive are fully dispersed and uniformly mixed; then slowly stirring, simultaneously uniformly adding the steel fibers with a set mass ratio, slowly stirring for 2-5min after all the steel fibers are added, and preferably controlling the total stirring time to be 8-15 min to form slurry; 2) molding: pouring the slurry from one side of the mold, tapping the side mold of the mold by using a rubber hammer to remove air bubbles after one-time pouring is finished, standing and solidifying the slurry to form an ultra-high performance concrete blank, and removing the ultra-high performance concrete blank from the mold after solidification and molding; 3) and (5) maintenance: curing the ultra-high performance concrete blank according to the following requirements: a) after the ultrahigh-performance concrete blank is formed, a plastic film is immediately covered on the surface of the ultrahigh-performance concrete blank to avoid water loss; b) curing the ultra-high performance concrete blank by adopting steam curing or normal temperature curing; and forming the ultra-high performance concrete bridge deck after the maintenance is finished. In the step 3), steam curing: standing for 24-30h after pouring, and demoulding; and (3) performing steam curing on the demolded product, putting the ultra-high performance concrete blank into a steam curing room, heating the ultra-high performance concrete blank to 90 +/-1 ℃ at a speed of not more than 15 ℃/h in the steam curing room, keeping the temperature for 45-52h, and then cooling the ultra-high performance concrete blank to 20 +/-5 ℃ at a speed of not more than 15 ℃/h. And 3), curing at normal temperature: standing for 28-36h after pouring, and demoulding; and (3) curing the demolded product at normal temperature, putting the ultra-high performance concrete blank into a normal temperature curing room or a curing pool, curing for 3-8d, wherein the temperature in the normal temperature curing room is 20 +/-5 ℃, the relative humidity is not lower than 95%, and a non-flowing calcium hydroxide saturated solution is placed in the curing pool, and the temperature of the solution is 20 +/-5 ℃.
To describe the present invention in detail, the structure of the embodiment will now be described.
Example 1
Producing an ultra-high performance concrete deck slab, 1) stirring: stirring by adopting a speed-adjustable forced stirrer, firstly putting cement, silica fume, fly ash and quartz sand into the stirrer according to a set mass ratio, and stirring for 5min, wherein the set mass ratio of the cement, the silica fume, the fly ash and the quartz sand is 95 parts of cement, 28 parts of silica fume, 24 parts of fly ash and 175 parts of quartz sand; adding 3 parts of additive and 32 parts of additive in a set mass ratio, and quickly stirring for 3min until the materials are fully dispersed and uniformly mixed; then stirring at a low speed, simultaneously uniformly adding 32 parts of steel fibers, and stirring at a low speed for 5min after all the steel fibers are added to form slurry; 2) molding: pouring the slurry from one side of the mold, tapping the side mold of the mold by using a rubber hammer to remove air bubbles after one-time pouring is finished, standing and solidifying the slurry to form an ultra-high performance concrete blank, and removing the ultra-high performance concrete blank from the mold after solidification and molding; 3) and (5) maintenance: curing the ultra-high performance concrete blank according to the following requirements: after the ultra-high performance concrete blank is formed, a plastic film is immediately covered on the surface of the ultra-high performance concrete blank to avoid water loss, and the ultra-high performance concrete blank is cured by steam: standing for 24h after pouring, and then demolding; and (3) performing steam curing on the demolded product, putting the ultra-high performance concrete blank into a steam curing room, heating the ultra-high performance concrete blank to 90 +/-1 ℃ at a speed of not more than 15 ℃/h in the steam curing room, keeping the temperature for 52h, and then cooling the ultra-high performance concrete blank to 20 +/-5 ℃ at a speed of not more than 15 ℃/h.
The comparative experimental data of the performance of the produced ultra-high performance concrete bridge deck and the concrete track slab in the prior art are as follows:
| performance index | Ultra-high performance concrete bridge deck | C60 track slab concrete |
| Compressive strength after steam curing | ≥150MPa | / |
| Modulus of elasticity | ≥40GPa | ≥36.5GPa |
| Flexural strength | ≥20MPa | ≥5MPa |
| Tensile strength | ≥8MPa | / |
| Impermeability property | Dcl≤20×10-14m2/s | / |
| Shrinkage rate | ≤600×10-6 | ≤400×10-6 |
Example 2
Producing another ultra-high performance concrete deck slab, 1) stirring: stirring by adopting a speed-adjustable forced stirrer, firstly putting cement, silica fume, fly ash and quartz sand into the stirrer according to a set mass ratio, and stirring for 2min, wherein the set mass ratio of the cement, the silica fume, the fly ash and the quartz sand is 105 parts of cement, 34 parts of silica fume, 42 parts of fly ash and 169 parts of quartz sand; adding water and an additive in a set mass ratio, wherein 1 part of the additive and 26 parts of the water are quickly stirred for 2min until the materials are fully dispersed and uniformly mixed; then stirring at a low speed, simultaneously uniformly adding 32 parts of steel fibers, and stirring at a low speed for 5min after all the steel fibers are added to form slurry; 2) molding: pouring the slurry from one side of the mold, tapping the side mold of the mold by using a rubber hammer to remove air bubbles after one-time pouring is finished, standing and solidifying the slurry to form an ultra-high performance concrete blank, and removing the ultra-high performance concrete blank from the mold after solidification and molding; 3) and (5) maintenance: curing the ultra-high performance concrete blank according to the following requirements: and (3) normal temperature maintenance: standing for 36h after pouring, and demolding; and (3) curing the demolded product at normal temperature, putting the ultra-high performance concrete blank into a normal temperature curing room or a curing pool, curing for 8 days, wherein the temperature in the normal temperature curing room is 20 +/-5 ℃, the relative humidity is not lower than 95%, and a non-flowing calcium hydroxide saturated solution is placed in the curing pool, and the solution temperature is 20 +/-5 ℃.
The comparative experimental data of the performance of the produced ultra-high performance concrete bridge deck and the concrete track slab in the prior art are as follows:
| performance index | Ultra-high performance concrete bridge deck | C60 track slab concrete |
| Compressive strength after normal temperature curing | ≥130MPa | ≥60MPa |
| Modulus of elasticity | ≥40GPa | ≥36.5GPa |
| Flexural strength | ≥20MPa | ≥5MPa |
| Tensile strength | ≥8MPa | / |
| Impermeability property | Dcl≤20×10-14m2/s | / |
| Shrinkage rate | ≤600×10-6 | ≤400×10-6 |
Example 3
Producing another ultra-high performance concrete deck slab, 1) stirring: stirring by adopting a speed-adjustable forced stirrer, firstly putting cement, silica fume, fly ash and quartz sand into the stirrer according to a set mass ratio, and stirring for 2min, wherein the set mass ratio of the cement, the silica fume, the fly ash and the quartz sand is 100 parts of cement, 31 parts of silica fume, 38 parts of fly ash and 169 parts of quartz sand; adding water and an additive in a set mass ratio, wherein the additive accounts for 2 parts and the water accounts for 29 parts, and quickly stirring for 2min until the materials are fully dispersed and uniformly mixed; then slowly stirring, simultaneously uniformly adding 25 parts of steel fibers, and slowly stirring for 5min after all the steel fibers are added; 2) molding: pouring the slurry from one side of the mold, tapping the side mold of the mold by using a rubber hammer to remove air bubbles after one-time pouring is finished, standing and solidifying the slurry to form an ultra-high performance concrete blank, and removing the ultra-high performance concrete blank from the mold after solidification and molding; 3) and (5) maintenance: curing the ultra-high performance concrete blank according to the following requirements: after the ultra-high performance concrete blank is formed, a plastic film is immediately covered on the surface of the ultra-high performance concrete blank to avoid water loss, and the ultra-high performance concrete blank is cured by steam: standing for 30h after pouring, and then demolding; and (3) performing steam curing on the demolded product, putting the ultra-high performance concrete blank into a steam curing room, heating the ultra-high performance concrete blank to 90 +/-1 ℃ at a speed of not more than 15 ℃/h in the steam curing room, keeping the temperature for 45h, cooling the ultra-high performance concrete blank to 20 +/-5 ℃ at a speed of not more than 15 ℃/h, and then preparing the ultra-high performance concrete bridge deck, wherein the performance index of the ultra-high performance concrete bridge deck completely meets the requirement.
The present invention is not limited to the above-described embodiments, and it is obvious to those skilled in the art that equivalent changes in the specific structure and the replacement of parts based on the present invention are within the protection scope of the present invention.
Claims (9)
1. The utility model provides an ultra high performance concrete decking which characterized by: the cement mortar comprises, by weight, 100 +/-5 parts of cement, 31 +/-3 parts of silica fume, 38 +/-4 parts of fly ash, 169 +/-6 parts of quartz sand, 25 +/-7 parts of steel fibers, 2 +/-1 part of an additive and 29 +/-3 parts of water.
2. The ultra-high performance concrete deck slab of claim 1, wherein: the cement mortar comprises, by weight, 100 +/-2 parts of cement, 31 +/-2 parts of silica fume, 38 +/-1 part of fly ash, 169 +/-2 parts of quartz sand, 25 +/-2 parts of steel fiber, 2 +/-1 part of additive and 29 +/-1 part of water.
3. The ultra-high performance concrete deck slab of claim 1, wherein: the cement mortar comprises, by weight, 100 parts of cement, 31 parts of silica fume, 38 parts of fly ash, 169 parts of quartz sand, 25 parts of steel fiber, 2 parts of an additive and 29 parts of water.
4. The ultra-high performance concrete bridge deck of any one of claims 1-3, wherein: the additive adopts a polycarboxylic acid water reducing agent.
5. The ultra-high performance concrete deck slab of claim 4, wherein: the steel fiber is formed by cutting a steel wire with the tensile strength not less than 2600Mpa, the diameter of the steel fiber is 0.2 +/-10% mm, and the length of the steel fiber is 10-15 mm.
6. A production process of an ultra-high performance concrete bridge deck slab is characterized by comprising the following steps:
1) stirring: stirring by adopting a speed-adjustable forced stirrer, firstly putting cement, silica fume, fly ash and quartz sand into the stirrer according to a set mass ratio, and stirring for 2-5 min; adding water and an additive in a set mass ratio, and quickly stirring for 3-8min until the water and the additive are fully dispersed and uniformly mixed; then slowly stirring, simultaneously uniformly adding the steel fibers with a set mass ratio, slowly stirring for 2-5min after all the steel fibers are added, and preferably controlling the total stirring time to be 8-15 min to form slurry;
2) molding: pouring the slurry from one side of the mold, tapping the side mold of the mold by using a rubber hammer to remove air bubbles after one-time pouring is finished, standing and solidifying the slurry to form an ultra-high performance concrete blank, and removing the ultra-high performance concrete blank from the mold after solidification and molding;
3) and (5) maintenance: curing the ultra-high performance concrete blank according to the following requirements:
a) after the ultrahigh-performance concrete blank is formed, a plastic film is immediately covered on the surface of the ultrahigh-performance concrete blank to avoid water loss;
b) curing the ultra-high performance concrete blank by adopting steam curing or normal temperature curing; and forming the ultra-high performance concrete bridge deck after the maintenance is finished.
7. The process for producing an ultra-high performance concrete deck slab as claimed in claim 6, wherein: the steel fiber is formed by cutting a steel wire with the tensile strength not less than 2600Mpa, the diameter of the steel fiber is 0.2 +/-10% mm, and the length of the steel fiber is 10-15 mm.
8. The process for producing an ultra-high performance concrete deck slab as claimed in claim 6, wherein: in the step 3), steam curing: standing for 24-30h after pouring, and demoulding; and (3) performing steam curing on the demolded product, putting the ultra-high performance concrete blank into a steam curing room, heating the ultra-high performance concrete blank to 90 +/-1 ℃ at a speed of not more than 15 ℃/h in the steam curing room, keeping the temperature for 45-52h, and then cooling the ultra-high performance concrete blank to 20 +/-5 ℃ at a speed of not more than 15 ℃/h.
9. The process for producing an ultra-high performance concrete deck slab as claimed in claim 6, wherein: and 3), curing at normal temperature: standing for 28-36h after pouring, and demoulding; and (3) curing the demolded product at normal temperature, putting the ultra-high performance concrete blank into a normal temperature curing room or a curing pool, curing for 3-8d, wherein the temperature in the normal temperature curing room is 20 +/-5 ℃, the relative humidity is not lower than 95%, and a non-flowing calcium hydroxide saturated solution is placed in the curing pool, and the temperature of the solution is 20 +/-5 ℃.
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| CN202111656489.4A CN114230262A (en) | 2021-12-31 | 2021-12-31 | Ultrahigh-performance concrete bridge deck and production process thereof |
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| CN114890746A (en) * | 2022-05-17 | 2022-08-12 | 成都城投城建科技有限公司 | Steel-STC light combined structure bridge deck pavement material, bridge deck and steam-curing-free construction process 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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Application publication date: 20220325 |