CN113336504A - Micro-bulging UHPC for bridge reinforcement and preparation process thereof - Google Patents
Micro-bulging UHPC for bridge reinforcement and preparation process thereof Download PDFInfo
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- CN113336504A CN113336504A CN202110754158.8A CN202110754158A CN113336504A CN 113336504 A CN113336504 A CN 113336504A CN 202110754158 A CN202110754158 A CN 202110754158A CN 113336504 A CN113336504 A CN 113336504A
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- 239000011374 ultra-high-performance concrete Substances 0.000 title claims abstract description 41
- 238000002360 preparation method Methods 0.000 title claims abstract description 21
- 230000002787 reinforcement Effects 0.000 title claims abstract description 18
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 79
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 77
- 238000003756 stirring Methods 0.000 claims abstract description 74
- 239000006004 Quartz sand Substances 0.000 claims abstract description 48
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 47
- 239000000463 material Substances 0.000 claims abstract description 43
- 239000000843 powder Substances 0.000 claims abstract description 34
- 239000004568 cement Substances 0.000 claims abstract description 29
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 26
- 239000010881 fly ash Substances 0.000 claims abstract description 25
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 25
- 239000010453 quartz Substances 0.000 claims abstract description 22
- 239000002002 slurry Substances 0.000 claims abstract description 13
- 238000007790 scraping Methods 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 8
- 239000000203 mixture Substances 0.000 claims abstract description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 18
- 239000000835 fiber Substances 0.000 claims description 18
- 239000010959 steel Substances 0.000 claims description 18
- 206010016766 flatulence Diseases 0.000 claims description 15
- 239000002245 particle Substances 0.000 claims description 9
- 239000004576 sand Substances 0.000 claims description 9
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 4
- 102100038694 DNA-binding protein SMUBP-2 Human genes 0.000 claims description 4
- 101000665135 Homo sapiens DNA-binding protein SMUBP-2 Proteins 0.000 claims description 4
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 4
- 239000000654 additive Substances 0.000 claims description 4
- 230000000996 additive effect Effects 0.000 claims description 4
- 239000011575 calcium Substances 0.000 claims description 4
- 229910052791 calcium Inorganic materials 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 4
- 229920000570 polyether Polymers 0.000 claims description 4
- 239000011398 Portland cement Substances 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 3
- 239000011362 coarse particle Substances 0.000 claims description 3
- 239000010419 fine particle Substances 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 239000004567 concrete Substances 0.000 abstract description 6
- 230000008961 swelling Effects 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002522 swelling effect Effects 0.000 description 1
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
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a micro-bulging UHPC for bridge reinforcement and a preparation process thereof, wherein quartz sand and half of water consumption are poured into a stirrer, the water content of the quartz sand is adjusted, and the stirring is carried out for 2-5 min; then adding cement, fly ash, silica fume, an expanding agent and quartz powder, so that the cementing material is better attached to the surface of quartz sand to form a layer of cementing slurry shell, and the interfacial binding power of the aggregate and the cementing material is improved; continuously stirring for 3-5 min; then adding a water reducing agent, a shrinkage reducing agent and the other half water, stopping the machine after stirring for 4-6min, manually stirring, and scraping out powder materials attached to the wall and the blades of the stirrer. The reinforcement micro-bulging UHPC prepared by the method can reduce the concrete shrinkage, improve the uniformity and strength of a mixture and improve the structural durability, and in the preparation engineering, quartz sand and part of water are added into a stirrer in advance, and then a cementing material is added for stirring, so that cement is uniformly distributed on the surface of aggregate, and the strength and the working performance are improved.
Description
Technical Field
The invention relates to the technical field of ultra-high performance concrete, in particular to a micro-bulging UHPC for bridge reinforcement and a preparation process thereof.
Background
UHPC (ultra high performance concrete) is used as the most innovative cement-based material, has the properties of high strength, high toughness and good durability, and is widely applied to the engineering such as bridge reinforcement, the UHPC is prepared by the traditional method, the water-cement ratio is low, the slurry contains a large amount of cement, active mineral admixture and other components, and the coarse aggregate content is very low, so the UHPC can generate larger shrinkage during setting, hardening and service, the concrete is easy to crack, and the adverse effect on the structural safety is caused; the traditional preparation process still continues to use the forming process of common concrete, and no specific measures are taken on stirring machinery, feeding sequence and stirring time, so that the prepared UHPC often has the problems of segregation and uneven steel fiber distribution, and further has adverse effects on the strength and durability of the UHPC.
Disclosure of Invention
The invention aims to provide a UHPC (ultra high Performance polycarbonate) for bridge reinforcement and micro-bulging and a preparation process thereof, which are used for solving the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: a UHPC for bridge reinforcement micro-bulging and a preparation process thereof comprise the following steps:
the micro-tympanites type UHPC comprises the following components in parts by weight:
60-85 parts of cement
10-20 parts of fly ash
10-15 parts of silica fume
95-120 parts of quartz sand
0-30 parts of quartz powder
1.0-1.5 parts of water reducing agent
0.1 to 0.5 portion of shrinkage reducing agent
6.0 to 8.0 portions of expanding agent
16-20 parts of water
10-15 parts of end hook steel fiber;
(II) preparation:
A. firstly, pouring quartz sand and half of water into a stirrer, adjusting the water content of the quartz sand, and stirring for 2-5 min;
B. then adding cement, fly ash, silica fume, an expanding agent and quartz powder, so that the cementing material is better attached to the surface of quartz sand to form a layer of cementing slurry shell, and the interfacial binding power of the aggregate and the cementing material is improved; continuously stirring for 3-5 min;
C. and then adding a water reducing agent, a shrinkage reducing agent and the other half water, stirring for 4-6min, stopping the machine, manually stirring, scraping powder materials attached to the wall and the blades of the stirrer, starting the stirrer, stirring for 4-8min, slowly adding the hook steel fibers, and stirring for 8-10min to obtain the micro-tympanites UHPC.
Preferably, the preferable mixture ratio in the step one is as follows: 65 parts of cement, 20 parts of fly ash, 15 parts of silica fume, 100 parts of quartz sand, 20 parts of quartz powder, 1.5 parts of water reducing agent, 0.5 part of shrinkage reducing agent, 8.0 parts of expanding agent, 16 parts of water and 15 parts of hook steel fiber, wherein the sum of the cement, the fly ash and the silica fume is 100 parts.
Preferably, the cement in the first step is normal portland cement marked with 525 grade; the type of the fly ash is F class I grade.
Preferably, the type of the silica fume in the step one is S95; the quartz sand comprises three particle grades, namely coarse particle size sand (1.18-0.60 mm), medium particle size sand (0.60-0.30 mm) and fine particle size sand (0.30-0.15 mm), and the weight is as follows: 5: blending at a ratio of 2.
Preferably, in the first step, the quartz powder is 325 mesh grade, and the density is 2.640g/cm3And the average particle size is 50 mu m.
Preferably, the water reducing agent in the first step is a high-performance polycarboxylic acid water reducing agent, the solid content is 23.5%, and the water reducing rate is more than 30%.
Preferably, the shrinkage reducing agent in the first step is a polyether shrinkage reducing additive.
Preferably, the swelling agent in the first step is HCSA calcium sulphoaluminate swelling agent, and has the characteristics of large absolute wet expansion rate and good swelling effect, and the 7d limited swelling rate in water can reach 0.060%.
Compared with the prior art, the invention has the following beneficial effects:
1. the reinforcement micro-bulging UHPC prepared by the method can reduce the concrete shrinkage, improve the uniformity and strength of a mixture and improve the structural durability, and in the preparation engineering, quartz sand and part of water are added into a stirrer in advance, and then a cementing material is added for stirring, so that cement is uniformly distributed on the surface of aggregate, and the strength and the working performance are improved.
2. The method has the advantages that the large-mixing-amount inert materials (silica fume, fly ash and the like adopted by the method) replace gelled materials in the UHPC, the quartz sand and quartz powder with certain gradation are added to replace original coarse aggregates, the internal porosity is reduced, the excellent mechanical property and durability of the material are realized, meanwhile, a proper amount of shrinkage reducing agent and expanding agent are added, the shrinkage of the UHPC material is reduced, and meanwhile, the development of later strength is not influenced.
3. The HCSA calcium sulphoaluminate expanding agent is added into the mixture, a large amount of expansive crystalline hydrate is generated after water is mixed, the expansive crystalline hydrate is enabled to generate proper expansion, the generated expansion energy is converted into compressive stress under the restraint of reinforcing steel bars and adjacent positions, the compressive stress can offset the shrinkage tensile stress of concrete in hardening, so that cracks are reduced, the surface tension of water can be reduced from a microstructure in UHPC capillary holes by the shrinkage reducing agent of the polyether shrinkage reducing type additive, the shrinkage force in the water evaporation process is reduced, and the purpose of reducing the cracking of the concrete is achieved.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a technical scheme that:
a UHPC for bridge reinforcement micro-bulging and a preparation process thereof comprise the following steps:
the micro-tympanites type UHPC comprises the following components in parts by weight:
60-85 parts of cement
10-20 parts of fly ash
10-15 parts of silica fume
95-120 parts of quartz sand
0-30 parts of quartz powder
1.0-1.5 parts of water reducing agent
0.1 to 0.5 portion of shrinkage reducing agent
6.0 to 8.0 portions of expanding agent
16-20 parts of water
10-15 parts of end hook steel fiber;
(II) preparation:
A. firstly, pouring quartz sand and half of water into a stirrer, adjusting the water content of the quartz sand, and stirring for 2-5 min;
B. then adding cement, fly ash, silica fume, an expanding agent and quartz powder, so that the cementing material is better attached to the surface of quartz sand to form a layer of cementing slurry shell, and the interfacial binding power of the aggregate and the cementing material is improved; continuously stirring for 3-5 min;
C. and then adding a water reducing agent, a shrinkage reducing agent and the other half water, stirring for 4-6min, stopping the machine, manually stirring, scraping powder materials attached to the wall and the blades of the stirrer, starting the stirrer, stirring for 4-8min, slowly adding the hook steel fibers, and stirring for 8-10min to obtain the micro-tympanites UHPC.
The first embodiment is as follows:
firstly, pouring quartz sand and half of water into a stirrer, adjusting the water content of the quartz sand, and stirring for 2-5 min; then adding cement, fly ash, silica fume, an expanding agent and quartz powder, so that the cementing material is better attached to the surface of quartz sand to form a layer of cementing slurry shell, and the interfacial binding power of the aggregate and the cementing material is improved; continuously stirring for 3-5 min; and then adding a water reducing agent, a shrinkage reducing agent and the other half water, stirring for 4-6min, stopping the machine, manually stirring, scraping powder materials attached to the wall and the blades of the stirrer, starting the stirrer, stirring for 4-8min, slowly adding the hook steel fibers, and stirring for 8-10min to obtain the micro-tympanites UHPC.
Example two:
in the first embodiment, the following steps are added:
the preferable mixture ratio in the first step is as follows: 65 parts of cement, 20 parts of fly ash, 15 parts of silica fume, 100 parts of quartz sand, 20 parts of quartz powder, 1.5 parts of water reducing agent, 0.5 part of shrinkage reducing agent, 8.0 parts of expanding agent, 16 parts of water and 15 parts of hook steel fiber, wherein the sum of the cement, the fly ash and the silica fume is 100 parts.
Firstly, pouring quartz sand and half of water into a stirrer, adjusting the water content of the quartz sand, and stirring for 2-5 min; then adding cement, fly ash, silica fume, an expanding agent and quartz powder, so that the cementing material is better attached to the surface of quartz sand to form a layer of cementing slurry shell, and the interfacial binding power of the aggregate and the cementing material is improved; continuously stirring for 3-5 min; and then adding a water reducing agent, a shrinkage reducing agent and the other half water, stirring for 4-6min, stopping the machine, manually stirring, scraping powder materials attached to the wall and the blades of the stirrer, starting the stirrer, stirring for 4-8min, slowly adding the hook steel fibers, and stirring for 8-10min to obtain the micro-tympanites UHPC.
Example three:
in the second embodiment, the following steps are added:
in the first step, ordinary portland cement marked with 525 is adopted as cement; the type of the fly ash is F class I grade.
Firstly, pouring quartz sand and half of water into a stirrer, adjusting the water content of the quartz sand, and stirring for 2-5 min; then adding cement, fly ash, silica fume, an expanding agent and quartz powder, so that the cementing material is better attached to the surface of quartz sand to form a layer of cementing slurry shell, and the interfacial binding power of the aggregate and the cementing material is improved; continuously stirring for 3-5 min; and then adding a water reducing agent, a shrinkage reducing agent and the other half water, stirring for 4-6min, stopping the machine, manually stirring, scraping powder materials attached to the wall and the blades of the stirrer, starting the stirrer, stirring for 4-8min, slowly adding the hook steel fibers, and stirring for 8-10min to obtain the micro-tympanites UHPC.
Example four:
in the third embodiment, the following steps are added:
the type of the silica fume in the first step is S95; the quartz sand comprises three particle grades, namely coarse particle size sand (1.18-0.60 mm), medium particle size sand (0.60-0.30 mm) and fine particle size sand (0.30-0.15 mm), and the weight is as follows: 5: blending at a ratio of 2.
Firstly, pouring quartz sand and half of water into a stirrer, adjusting the water content of the quartz sand, and stirring for 2-5 min; then adding cement, fly ash, silica fume, an expanding agent and quartz powder, so that the cementing material is better attached to the surface of quartz sand to form a layer of cementing slurry shell, and the interfacial binding power of the aggregate and the cementing material is improved; continuously stirring for 3-5 min; and then adding a water reducing agent, a shrinkage reducing agent and the other half water, stirring for 4-6min, stopping the machine, manually stirring, scraping powder materials attached to the wall and the blades of the stirrer, starting the stirrer, stirring for 4-8min, slowly adding the hook steel fibers, and stirring for 8-10min to obtain the micro-tympanites UHPC.
Example five:
in the fourth example, the following steps were added:
in the first step, the quartz powder is 325 meshes and the density is 2.640g/cm3And the average particle size is 50 mu m.
Firstly, pouring quartz sand and half of water into a stirrer, adjusting the water content of the quartz sand, and stirring for 2-5 min; then adding cement, fly ash, silica fume, an expanding agent and quartz powder, so that the cementing material is better attached to the surface of quartz sand to form a layer of cementing slurry shell, and the interfacial binding power of the aggregate and the cementing material is improved; continuously stirring for 3-5 min; and then adding a water reducing agent, a shrinkage reducing agent and the other half water, stirring for 4-6min, stopping the machine, manually stirring, scraping powder materials attached to the wall and the blades of the stirrer, starting the stirrer, stirring for 4-8min, slowly adding the hook steel fibers, and stirring for 8-10min to obtain the micro-tympanites UHPC.
Example six:
in the fifth example, the following steps were added:
in the first step, the water reducing agent is a high-performance polycarboxylic acid water reducing agent, the solid content is 23.5%, and the water reducing rate is more than 30%.
Firstly, pouring quartz sand and half of water into a stirrer, adjusting the water content of the quartz sand, and stirring for 2-5 min; then adding cement, fly ash, silica fume, an expanding agent and quartz powder, so that the cementing material is better attached to the surface of quartz sand to form a layer of cementing slurry shell, and the interfacial binding power of the aggregate and the cementing material is improved; continuously stirring for 3-5 min; and then adding a water reducing agent, a shrinkage reducing agent and the other half water, stirring for 4-6min, stopping the machine, manually stirring, scraping powder materials attached to the wall and the blades of the stirrer, starting the stirrer, stirring for 4-8min, slowly adding the hook steel fibers, and stirring for 8-10min to obtain the micro-tympanites UHPC.
Example seven:
in example six, the following steps were added:
in the first step, the shrinkage reducing agent is a polyether shrinkage reducing additive.
Firstly, pouring quartz sand and half of water into a stirrer, adjusting the water content of the quartz sand, and stirring for 2-5 min; then adding cement, fly ash, silica fume, an expanding agent and quartz powder, so that the cementing material is better attached to the surface of quartz sand to form a layer of cementing slurry shell, and the interfacial binding power of the aggregate and the cementing material is improved; continuously stirring for 3-5 min; and then adding a water reducing agent, a shrinkage reducing agent and the other half water, stirring for 4-6min, stopping the machine, manually stirring, scraping powder materials attached to the wall and the blades of the stirrer, starting the stirrer, stirring for 4-8min, slowly adding the hook steel fibers, and stirring for 8-10min to obtain the micro-tympanites UHPC.
Example eight:
in example seven, the following steps were added:
the expanding agent in the first step is HCSA calcium sulphoaluminate expanding agent, and has the characteristics of large moisture-proof expansion rate and good expansion effect, and the 7d limited expansion rate in water can reach 0.060%.
Firstly, pouring quartz sand and half of water into a stirrer, adjusting the water content of the quartz sand, and stirring for 2-5 min; then adding cement, fly ash, silica fume, an expanding agent and quartz powder, so that the cementing material is better attached to the surface of quartz sand to form a layer of cementing slurry shell, and the interfacial binding power of the aggregate and the cementing material is improved; continuously stirring for 3-5 min; and then adding a water reducing agent, a shrinkage reducing agent and the other half water, stirring for 4-6min, stopping the machine, manually stirring, scraping powder materials attached to the wall and the blades of the stirrer, starting the stirrer, stirring for 4-8min, slowly adding the hook steel fibers, and stirring for 8-10min to obtain the micro-tympanites UHPC.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A UHPC for bridge reinforcement micro-tympanites and a preparation process thereof are characterized in that: the method comprises the following steps:
the micro-tympanites type UHPC comprises the following components in parts by weight:
60-85 parts of cement
10-20 parts of fly ash
10-15 parts of silica fume
95-120 parts of quartz sand
0-30 parts of quartz powder
1.0-1.5 parts of water reducing agent
0.1 to 0.5 portion of shrinkage reducing agent
6.0 to 8.0 portions of expanding agent
16-20 parts of water
10-15 parts of end hook steel fiber;
(II) preparation:
A. firstly, pouring quartz sand and half of water into a stirrer, adjusting the water content of the quartz sand, and stirring for 2-5 min;
B. then adding cement, fly ash, silica fume, an expanding agent and quartz powder, so that the cementing material is better attached to the surface of quartz sand to form a layer of cementing slurry shell, and the interfacial binding power of the aggregate and the cementing material is improved; continuously stirring for 3-5 min;
C. and then adding a water reducing agent, a shrinkage reducing agent and the other half water, stirring for 4-6min, stopping the machine, manually stirring, scraping powder materials attached to the wall and the blades of the stirrer, starting the stirrer, stirring for 4-8min, slowly adding the hook steel fibers, and stirring for 8-10min to obtain the micro-tympanites UHPC.
2. The UHPC for bridge reinforcement and micro-bulging and the preparation process thereof according to claim 1 are characterized in that: the preferable mixture ratio in the first step is as follows: 65 parts of cement, 20 parts of fly ash, 15 parts of silica fume, 100 parts of quartz sand, 20 parts of quartz powder, 1.5 parts of water reducing agent, 0.5 part of shrinkage reducing agent, 8.0 parts of expanding agent, 16 parts of water and 15 parts of hook steel fiber, wherein the sum of the cement, the fly ash and the silica fume is 100 parts.
3. The UHPC for bridge reinforcement and micro-bulging and the preparation process thereof according to claim 1 are characterized in that: the cement in the first step is normal portland cement marked with 525 grade; the type of the fly ash is F class I grade.
4. The UHPC for bridge reinforcement and micro-bulging and the preparation process thereof according to claim 1 are characterized in that: the type of the silica fume in the first step is S95; the quartz sand comprises three particle grades, namely coarse particle size sand (1.18-0.60 mm), medium particle size sand (0.60-0.30 mm) and fine particle size sand (0.30-0.15 mm), and the weight is as follows: 5: blending at a ratio of 2.
5. The UHPC for bridge reinforcement and micro-bulging and the preparation process thereof according to claim 1 are characterized in that: in the first step, the quartz powder is 325 meshes and the density is 2.640g/cm3And the average particle size is 50 mu m.
6. The UHPC for bridge reinforcement and micro-bulging and the preparation process thereof according to claim 1 are characterized in that: in the first step, the water reducing agent is a high-performance polycarboxylic acid water reducing agent, the solid content is 23.5%, and the water reducing rate is more than 30%.
7. The UHPC for bridge reinforcement and micro-bulging and the preparation process thereof according to claim 1 are characterized in that: in the first step, the shrinkage reducing agent is a polyether shrinkage reducing additive.
8. The UHPC for bridge reinforcement and micro-bulging and the preparation process thereof according to claim 1 are characterized in that: the expanding agent in the first step is HCSA calcium sulphoaluminate expanding agent, and has the characteristics of large moisture-proof expansion rate and good expansion effect, and the 7d limited expansion rate in water can reach 0.060%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110754158.8A CN113336504A (en) | 2021-07-05 | 2021-07-05 | Micro-bulging UHPC for bridge reinforcement and preparation process thereof |
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| CN202110754158.8A CN113336504A (en) | 2021-07-05 | 2021-07-05 | Micro-bulging UHPC for bridge reinforcement and preparation process thereof |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108929080A (en) * | 2017-05-24 | 2018-12-04 | 湖南大学 | A kind of micro expansion compensation shrinks ultra-high performance concrete and preparation method thereof |
| AU2021101949A4 (en) * | 2021-04-15 | 2021-06-03 | China Construction Ready Mixed Concrete Co.Ltd. | A Kind of Green High Performance Concrete |
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2021
- 2021-07-05 CN CN202110754158.8A patent/CN113336504A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108929080A (en) * | 2017-05-24 | 2018-12-04 | 湖南大学 | A kind of micro expansion compensation shrinks ultra-high performance concrete and preparation method thereof |
| AU2021101949A4 (en) * | 2021-04-15 | 2021-06-03 | China Construction Ready Mixed Concrete Co.Ltd. | A Kind of Green High Performance Concrete |
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