CN115368091A - Early-strength ultrahigh-performance cement-based material for rapid reinforcement of flexural member and preparation method thereof - Google Patents
Early-strength ultrahigh-performance cement-based material for rapid reinforcement of flexural member and preparation method thereof Download PDFInfo
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- CN115368091A CN115368091A CN202211188056.5A CN202211188056A CN115368091A CN 115368091 A CN115368091 A CN 115368091A CN 202211188056 A CN202211188056 A CN 202211188056A CN 115368091 A CN115368091 A CN 115368091A
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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
- C04B28/06—Aluminous cements
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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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
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
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- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Working Measures On Existing Buildindgs (AREA)
Abstract
The invention relates to an early-strength ultrahigh-performance cement-based material for quickly reinforcing a flexural member and a preparation method thereof, wherein the cement-based material comprises the following raw material components in parts by weight: 500-1000 parts of cementing material, 1000-2000 parts of aggregate, 10-60 parts of reinforcing fiber, 10-35 parts of latex powder, 1-3 parts of cellulose ether, 2-5 parts of water reducing agent and 150-300 parts of water. Compared with the prior art, the sulphoaluminate cement used in the invention has the excellent characteristics of rapid hardening, early strength and high strength, good freezing resistance, good corrosion resistance and impermeability and controllable shrinkage compensation, solves the problems of insufficient early strength, poor toughness, easy secondary cracking and peeling and the like of the common repairing and reinforcing cement-based material, and has inherent remarkable popularization significance and application prospect on the maintenance of the existing flexural member.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to an early-strength ultrahigh-performance cement-based material for quickly reinforcing a bent member and a preparation method thereof.
Background
The flexural member is one of the most widely used members in the reinforced concrete structure, and a typical example is a bridge structure in the transportation field. At present, the number of bridges in China is close to million, the number of bridges still rises every year, and the number of dangerous bridges is also explosively increased. It is foreseeable that with the continuous increase of corresponding traffic loads and the continuous increase of natural disasters, a large number of bent members such as bridge engineering and the like need to be maintained and reinforced after two or thirty years.
At present, the main repairing and reinforcing technologies for the in-service damaged bent member include: (1) The reinforcing method of externally pasting carbon fiber cloth or externally wrapping steel affects the appearance and is not easy to be secondarily decorated. (2) The steel bar embedding method can greatly improve the toughness (the ultimate strain of the concrete reaches about 7 percent), but has high cost and needs a large amount of space in the operation process. Therefore, in order to effectively prolong the service life of the damaged and bent member, the most convenient and effective method is to carry out in-situ repair and reinforcement on the damaged and bent member. Cement-based materials are often used as repair materials due to their low cost and good compatibility with old substrates. However, in essence, the cement-based material is a brittle material, and the tensile strength of the cement-based material is only about 1/10 of the compressive strength. With the increase of service life, the concrete structure is very easy to crack, leak and corrode the reinforcing steel bar and the like seriously under the coupling action of various vehicle loads and corrosion environments, which brings huge loss to national economy, and a cement-based material integrating early strength and high performance is urgently needed to be sought.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide an early-strength ultrahigh-performance cement-based material for quickly reinforcing a bent member and a preparation method thereof.
The sulphoaluminate cement as a kind of quick-hardening early-strength cement has lower calcination temperature than common Portland cement and has good environmental benefit. And the strength of the composite material is mainly derived from a symbiotic staggered network of needle-shaped ettringite crystals, and the mechanical interlocking effect of the network can better dissipate energy under the action of external force and shows better toughness. In addition, the sulphoaluminate cement can generate stronger adhesive strength and larger anti-stripping shear stress with the fiber, and is more suitable for repairing and reinforcing the damaged and bent member in service.
The purpose of the invention can be realized by the following technical scheme:
one of the technical schemes of the invention is as follows: the early-strength ultrahigh-performance cement-based material for quickly reinforcing the flexural member is composed of the following raw material components in parts by weight:
further, the cementing material is selected from any one or combination of sulphoaluminate cement, portland cement or mineral powder.
It is further preferred that the cementitious material is a combination of sulphoaluminate cement, portland cement and mineral powder.
Further, the aggregate is selected from any one of quartz sand, machine-made sand or iron tailings sand or a combination thereof.
Further, the aggregate is composed of a mixture of particles having particle diameters in the range of 0.125mm to 0.212mm (including 0.125mm and 0.212 mm), 0.212mm to 0.425mm (including 0.425mm but not including 0.212 mm), 0.425mm to 0.85mm (including 0.85mm but not including 0.425 mm) and 0.85mm to 2mm (including 2mm but not including 0.85 mm), respectively, and the mass ratio of the aggregate particles having particle diameters in the range of 0.125mm to 0.212mm,0.212mm to 0.425mm,0.425mm to 0.85mm and 0.85mm to 2mm is 1. And the grading curve of the aggregate is a second area.
Further, the reinforcing fibers are selected from PVA fibers or basalt fibers or a combination of PVA fibers and basalt fibers;
when the reinforcing fiber is selected from PVA fibers, the amount of the PVA fibers is 10 to 20 parts;
when the reinforced fiber is selected from basalt fiber, the using amount of the basalt fiber is 20-40 parts;
when the reinforced fiber is selected from the combination of PVA fiber and basalt fiber, the dosage of the PVA fiber is 10 to 20 parts, and the dosage of the basalt fiber is 20 to 40 parts;
further, the PVA fiber is coated with an oiling agent on the surface, and the oiling agent accounts for 12% of the mass of the PVA fiber.
More preferably, the oil agent is oxidized polyethylene.
Further, the latex powder is an acetic acid-vinyl acetate copolymer, the volume weight is 550g/L, and the pH value is 8.
Further, the cellulose ether has a viscosity of 400pa.s and a residual moisture of less than 1%.
Further, the water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate is more than 35%.
The second technical scheme of the invention is as follows: the preparation method of the early-strength ultrahigh-performance cement-based material for quickly reinforcing the flexural member is provided, and comprises the following steps:
(1) Preparing raw materials;
(2) Adding a water reducing agent into water in advance, and fully and uniformly mixing to prepare a water reducing agent solution;
(3) Mixing the other raw materials except the reinforced fibers, adding the mixture into the water reducing agent solution obtained in the step (2), and stirring to obtain a mixed solution;
(4) Slowly adding the twisted and dispersed reinforced fibers into the mixed liquid obtained in the step (3), and stirring to obtain mortar;
(5) And (5) pouring the mortar obtained in the step (4) into a mould, and vibrating to obtain a target product.
Further, the stirring condition in the step (3) is 40 plus or minus 5rpm for 2min, and the stirring condition in the step (4) is 285 plus or minus 10rpm for 2min.
Further preferably, the mold in the step (4) is a steel mold.
The third technical scheme of the invention is as follows: the application of the early-strength ultrahigh-performance cement-based material for quickly reinforcing the flexural member is provided, and the early-strength ultrahigh-performance cement-based material for quickly reinforcing the flexural member is used as a repairing and reinforcing material for a damaged flexural member.
Compared with the prior art, the invention has the following beneficial effects:
(1) The sulphoaluminate cement used by the invention has the excellent characteristics of quick hardening, early strength and high strength, good freezing resistance, good corrosion resistance and impermeability and controllable shrinkage compensation, can well meet the construction requirements of repairing and reinforcing flexural members such as bridges, and has better volume compatibility and chemical compatibility with the old flexural members which belong to cement-based materials. The problems of insufficient early strength, poor toughness, easy secondary cracking and peeling and the like of the common repairing and reinforcing cement-based material are solved, and the method has obvious popularization significance and application prospect for the maintenance of the existing bent member.
(2) Compared with the traditional Portland cement, the sulphoaluminate cement used in the invention has a more compact microstructure after being hydrated, is beneficial to the fiber to play a bridging role, and has better toughness of the composite material. In addition, the calcination temperature of the sulphoaluminate cement is about 1250 ℃, which is 150 to 200 ℃ lower than that of the portland cement clinker, and the sulphoaluminate cement has the advantages of low calcination temperature, easy grinding and low carbon emission.
(3) The particle size distribution of the aggregate sand used in the invention accords with the secondary grading, and the workability and mechanical property of mortar (or concrete) can be effectively improved.
(4) The PVA fiber and the basalt fiber in the invention can greatly improve the strength and the toughness of the cement-based material, and especially can play a role in synergy among the fibers after the two fibers are mixed. In addition, considering that the bending-resistant members such as bridges are mostly of water structures, the PVA fibers and the basalt fibers are not easy to corrode by harmful ions, can maintain the performance of the members for a long time, and are lower in cost.
(5) According to the invention, the solid waste material iron tailing sand is used as the admixture, so that the green energy-saving and efficient resource recycling is effectively realized.
Drawings
FIG. 1 is a flow chart of the operation of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
In the following examples and comparative examples, unless otherwise specified, all the starting materials or treatment techniques are indicated to be conventional commercial starting materials or conventional treatment techniques in the art.
The following examples and comparative examples were prepared according to the preparation method as shown in FIG. 1. The method comprises the following steps:
(1) Preparing raw materials;
(2) Adding a water reducing agent into water in advance, and fully and uniformly mixing to obtain a water reducing agent solution;
(3) Mixing the other raw materials except the reinforced fibers, adding the mixture into the water reducing agent solution obtained in the step (2), and stirring at low speed of 40 +/-5 rpm for 2min to obtain a mixed solution;
(4) Slowly adding the twisted and dispersed reinforced fibers into the mixed solution obtained in the step (3), and stirring at a high speed of 285 +/-10 rpm for 2min to obtain mortar;
(5) And (4) pouring the mortar obtained in the step (4) into a mould, and vibrating to obtain a target product.
And finally, carrying out performance detection on the target product.
The above embodiments will be described in more detail with reference to specific examples.
Example 1:
the embodiment provides an early-strength ultrahigh-performance cement-based material for quickly reinforcing a bent member, which comprises the following raw material components in parts by weight: 350 parts of sulphoaluminate cement, 100 parts of Portland cement, 50 parts of mineral powder, 1000 parts of quartz sand, 20 parts of PVA fiber, 10 parts of latex powder, 1 part of cellulose ether, 4 parts of water reducing agent and 150 parts of water.
Example 2:
the embodiment provides an early-strength ultrahigh-performance cement-based material for quickly reinforcing a bent member, which comprises the following raw material components in parts by weight: 350 parts of sulphoaluminate cement, 50 parts of portland cement, 100 parts of mineral powder, 500 parts of quartz sand, 500 parts of machine-made sand, 20 parts of PVA (polyvinyl alcohol) fibers, 20 parts of latex powder, 1 part of cellulose ether, 4 parts of a water reducing agent and 150 parts of water.
Example 3:
the embodiment provides an early-strength ultrahigh-performance cement-based material for quickly reinforcing a bent member, which comprises the following raw material components in parts by weight: 350 parts of sulphoaluminate cement, 100 parts of Portland cement, 50 parts of mineral powder, 500 parts of quartz sand, 300 parts of machine-made sand, 200 parts of iron tailing sand, 40 parts of basalt fiber, 10 parts of latex powder, 1 part of cellulose ether, 2 parts of a water reducing agent and 150 parts of water.
Example 4:
the embodiment provides an early-strength ultrahigh-performance cement-based material for quickly reinforcing a bent member, which comprises the following raw material components in parts by weight: 350 parts of sulphoaluminate cement, 100 parts of Portland cement, 50 parts of mineral powder, 500 parts of quartz sand, 300 parts of machine-made sand, 200 parts of iron tailing sand, 10 parts of PVA fiber, 20 parts of basalt fiber, 20 parts of latex powder, 1 part of cellulose ether, 3 parts of a water reducing agent and 150 parts of water.
Example 5:
the embodiment provides a flexural member is consolidated fast and is used super high performance cement-based material of early strength, includes the following parts by weight of raw materials component: 1000 parts of a cementing material, 2000 parts of aggregate, 10 parts of PVA fiber, 20 parts of basalt fiber, 35 parts of latex powder, 3 parts of cellulose ether, 5 parts of a water reducing agent and 300 parts of water.
Comparative example 1:
the difference from example 1 is that: no sulphoaluminate cement is doped.
Comparative example 2:
the difference from example 4 is that: no PVA fibers were incorporated.
Comparative example 3:
the difference from example 4 is that: basalt fiber is not doped.
The main performance indexes of the above examples and comparative examples are shown in table 1:
TABLE 1 Main Properties of Cement-based materials
As can be seen from the table 1, the setting time of the embodiment of the invention is between 26 and 35min, and the requirement of quick repair is met; the rupture strength is between 5.6MPa and 6.1MPa after 4 hours; the 3d rupture strength is between 8.0MPa and 8.6MPa, and the early strength and the high strength are achieved; the drying shrinkage rate of 28d is between 0.05 and 0.09 percent, and the product has good volume stability; 3d tensile strain is between 3.5% and 5.1%, and the product has good toughness; low diffusion coefficient of chlorine ion resistance and good durability. Compared with the single-factor change comparison example, the examples have better performance indexes, and show the importance of the mixing of the sulphoaluminate cement and the fibers to the invention.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. The early-strength ultrahigh-performance cement-based material for quickly reinforcing the flexural member is characterized by comprising the following raw material components in parts by weight:
2. the early strength ultra-high performance cement-based material for rapidly reinforcing the bent member according to claim 1, wherein the cementing material is selected from any one or a combination of sulphoaluminate cement, portland cement or mineral powder.
3. The early strength ultra-high performance cement-based material for rapid reinforcement of flexural members of claim 1, wherein the aggregate is selected from any one or a combination of quartz sand, machine-made sand or iron tailings sand;
the aggregate is formed by mixing particles with the particle diameters of 0.125-0.212 mm, 0.212-0.425 mm, 0.425-0.85 mm and 0.85-2 mm respectively, wherein the mass ratio of the aggregate particles with the particle diameters of 0.125-0.212mm, 0.212mm-0.425mm, 0.425mm-0.85 mm and 0.85-2 mm is 1.
4. The early strength ultra-high performance cement-based material for rapid reinforcement of flexural members of claim 1, wherein the reinforcing fibers are selected from PVA fibers or basalt fibers or a combination of PVA fibers and basalt fibers;
when the reinforcing fiber is selected from PVA fibers, the amount of the PVA fibers is 10 to 20 parts;
when the reinforced fiber is selected from basalt fiber, the using amount of the basalt fiber is 20-40 parts;
when the reinforced fiber is selected from the combination of PVA fiber and basalt fiber, the dosage of the PVA fiber is 10 to 20 parts, and the dosage of the basalt fiber is 20 to 40 parts;
the PVA fiber is coated with an oiling agent on the surface, and the oiling agent accounts for 12% of the mass of the PVA fiber.
5. The early strength ultra-high performance cement-based material for rapidly reinforcing a bent member according to claim 1, wherein the latex powder is a vinyl acetate-vinyl acetate copolymer.
6. The early strength ultra high performance cement-based material for the rapid reinforcement of flexural members of claim 1, wherein the cellulose ether has a viscosity of 400pa.s and a residual moisture of less than 1%.
7. The early strength ultra-high performance cement-based material for rapidly reinforcing a bent member according to claim 1, wherein the water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate is more than 35%.
8. A method for preparing an early-strength ultrahigh-performance cement-based material for rapidly reinforcing a bent member according to any one of claims 1 to 7, comprising the steps of:
(1) Preparing raw materials;
(2) Adding a water reducing agent into water in advance, and uniformly mixing to obtain a water reducing agent solution;
(3) Mixing the other raw materials except the reinforced fibers, adding the mixture into the water reducing agent solution obtained in the step (2), and stirring to obtain a mixed solution;
(4) Twisting and dispersing the reinforced fibers, slowly adding the reinforced fibers into the mixed solution obtained in the step (3), and stirring to obtain mortar;
(5) And (5) pouring the mortar obtained in the step (4) into a mould, and vibrating to obtain the early-strength ultrahigh-performance cement-based material.
9. The method for preparing the early-strength ultrahigh-performance cement-based material for rapidly reinforcing the bent member according to claim 8, wherein the stirring conditions in the step (3) are as follows: stirring at 40 + -5 rpm for 2min, and stirring in step (4) at 285 + -10 rpm for 2min.
10. The use of an early strength ultrahigh performance cement-based material for the rapid reinforcement of flexural members according to any one of claims 1 to 7, wherein the early strength ultrahigh performance cement-based material is used as a repairing and reinforcing material for damaged flexural members.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008050213A (en) * | 2006-08-25 | 2008-03-06 | Denki Kagaku Kogyo Kk | Material for repairing cross section and method for repairing cross section |
| CN101935201A (en) * | 2009-06-30 | 2011-01-05 | 中冶建筑研究总院有限公司 | Single-component high-performance mortar for repairing and reinforcing concrete |
| CN103304205A (en) * | 2013-07-04 | 2013-09-18 | 重庆久圣成防水材料有限公司 | Capillary crystalline patch plaster |
| CN108947419A (en) * | 2018-07-17 | 2018-12-07 | 广东复特新型材料科技有限公司 | A kind of dedicated mending mortar of structure and preparation method |
| CN110330273A (en) * | 2019-05-31 | 2019-10-15 | 中国铁路总公司 | Fibre reinforced concrete raw material, fibre reinforced concrete and its preparation method and application |
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- 2022-09-28 CN CN202211188056.5A patent/CN115368091B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008050213A (en) * | 2006-08-25 | 2008-03-06 | Denki Kagaku Kogyo Kk | Material for repairing cross section and method for repairing cross section |
| CN101935201A (en) * | 2009-06-30 | 2011-01-05 | 中冶建筑研究总院有限公司 | Single-component high-performance mortar for repairing and reinforcing concrete |
| CN103304205A (en) * | 2013-07-04 | 2013-09-18 | 重庆久圣成防水材料有限公司 | Capillary crystalline patch plaster |
| CN108947419A (en) * | 2018-07-17 | 2018-12-07 | 广东复特新型材料科技有限公司 | A kind of dedicated mending mortar of structure and preparation method |
| CN110330273A (en) * | 2019-05-31 | 2019-10-15 | 中国铁路总公司 | Fibre reinforced concrete raw material, fibre reinforced concrete and its preparation method and application |
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