CN115368091B - 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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- CN115368091B CN115368091B CN202211188056.5A CN202211188056A CN115368091B CN 115368091 B CN115368091 B CN 115368091B CN 202211188056 A CN202211188056 A CN 202211188056A CN 115368091 B CN115368091 B CN 115368091B
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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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- 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)
- Working Measures On Existing Buildindgs (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to an early strength ultra-high performance cement-based material for rapid reinforcement of 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 reducer and 150-300 parts of water. Compared with the prior art, the sulphoaluminate cement used by the invention has the excellent characteristics of quick hardening, early strength, good freezing resistance, corrosion resistance, good impermeability and controllable shrinkage compensation, solves the problems of insufficient early strength, poor toughness, easiness in cracking and peeling again and the like of common repairing and reinforcing cement-based materials, and has obvious popularization significance and application prospect for the maintenance of the existing flexural members.
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 rapid reinforcement of a flexural member and a preparation method thereof.
Background
The flexural member is one of the most widely used members in reinforced concrete structures, and a typical example is a bridge structure in the field of transportation. The number of bridges in China is approaching millions at present, the number of bridges still rises each year, and the number of dangerous bridges also increases explosively. It is expected that, as the corresponding traffic load continues to increase and natural disasters continue to increase, a great number of flexural members such as bridge projects need to be maintained and reinforced after two and thirty years.
At present, the main repairing and reinforcing technology of the damaged flexural member in service comprises the following steps: (1) The external carbon fiber cloth or the external steel coating reinforcement method can influence the appearance and is not easy to decorate secondarily. (2) The method of embedding reinforcing steel bars can greatly improve toughness (make limit strain of concrete reach about 7%), but has higher cost and requires a large amount of space in the operation process. Therefore, to effectively prolong the service life of the damaged flexural member, the most convenient and effective method is to repair and reinforce the flexural member in situ. Cement-based materials are often used as repair materials due to their low cost and good compatibility with the old matrix. In essence, however, cement-based materials are brittle materials with a tensile strength of only about 1/10 of the compressive strength. Along with the increase of service life, the concrete structure is extremely easy to have serious problems of cracking, leakage, steel bar corrosion and the like under the coupling action of various vehicle loads and erosion environments, and huge loss is brought to national economy, so that a cement-based material with both early strength and high performance is required to be sought.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an early-strength ultrahigh-performance cement-based material for quickly reinforcing a flexural member and a preparation method thereof.
The sulphoaluminate cement is used as a kind of quick hardening early strength cement, has lower calcination temperature than common silicate cement, and has good environmental benefit. The strength of the fiber is derived from the 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 show better toughness. In addition, the sulphoaluminate cement can generate stronger bonding strength and larger stripping shearing stress resistance with the fiber, and is more suitable for repairing and reinforcing the damaged flexural member in service.
The aim of the invention can be achieved 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 comprises the following raw material components in parts by weight:
further, the cementing material is selected from any one of sulphoaluminate cement, silicate cement or mineral powder or a combination thereof.
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 or combination of quartz sand, machine-made sand or iron tailing sand.
Further, the aggregate is composed of particles having particle diameters in the ranges of 0.125mm to 0.212mm (including 0.125mm and 0.212 mm), 0.212mm to 0.425mm (including 0.425mm but excluding 0.212 mm), 0.425mm to 0.85mm (including 0.85mm but excluding 0.425 mm) and 0.85mm to 2mm (including 2mm but excluding 0.85 mm), respectively, and the mass ratio of the aggregate particles having particle diameters in the ranges of 0.125mm to 0.212mm,0.212mm to 0.425mm,0.425mm to 0.85mm and 0.85mm to 2mm is 1:2:3:4, respectively. The grading curve of the aggregate is two areas.
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 fiber, the PVA fiber is used in 10-20 parts;
when the reinforcing fiber is selected from basalt fiber, the dosage of the basalt fiber is 20-40 parts;
when the reinforcing fiber is selected from the combination of PVA fiber and basalt fiber, the PVA fiber is 10-20 parts, and the basalt fiber is 20-40 parts;
further, the PVA fiber is a PVA fiber with a surface coated with an oiling agent, and the oiling agent accounts for 12% of the mass of the PVA fiber.
Further preferably, the oil is oxidized polyethylene.
Further, the latex powder is acetic acid-vinyl acetate copolymer, the volume weight is 550g/L, and the pH 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 polycarboxylate 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 comprises the following steps:
(1) Preparing each raw material;
(2) Adding the water reducer into water in advance, and fully and uniformly mixing to obtain a water reducer solution;
(3) Mixing the rest raw materials except the reinforcing fibers, adding the mixture into the water reducing agent solution in the step (2), and stirring to obtain a mixed solution;
(4) Slowly adding the reinforcing fiber powder into the mixed solution in the step (3), and stirring to obtain mortar;
(5) Pouring the mortar in the step (4) into a mould, and vibrating to obtain a target product.
Further, the stirring condition in the step (3) is stirring at 40+ -5 rpm for 2min, and the stirring condition in the step (4) is stirring at 285+ -10 rpm for 2min.
It is further preferred that the mold in step (4) is a steel mold.
The third technical scheme of the invention: the application of the early-strength ultra-high-performance cement-based material for quickly reinforcing the flexural member is provided, and the early-strength ultra-high-performance cement-based material for quickly reinforcing the flexural member is used as a repair reinforcing material for the flexural member damaged in service.
Compared with the prior art, the invention has the following beneficial effects:
(1) The sulphoaluminate cement used in the invention has the excellent characteristics of quick hardening, early strength, high strength, good freezing resistance, good corrosion resistance, good impermeability and controllable shrinkage compensation, can well meet the construction requirements of repairing and reinforcing flexural members such as bridges and the like, belongs to cement-based materials with the old flexural members, and has better volume compatibility and chemical compatibility. Solves the problems of insufficient early strength, poor toughness, easy cracking and peeling again and the like of the common repairing and reinforcing cement-based material, and has obvious popularization significance and application prospect for the maintenance of the existing flexural member.
(2) Compared with the traditional silicate cement, the sulphoaluminate cement used in the invention has a denser microstructure after hydration, is favorable for fiber to play a bridging role, and has better toughness. In addition, the calcination temperature of the sulphoaluminate cement is about 1250 ℃, 150-200 ℃ lower than that of silicate cement clinker, and the sulphoaluminate cement has the advantages of low calcination temperature, easiness in grinding and low carbon emission.
(3) The grain 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 basalt fiber in the invention can greatly improve the strength and toughness of cement-based materials, and especially can play a synergistic effect between fibers after the two fibers are mixed. In addition, considering that the bending-resistant components such as bridges and the like are mostly of water structures, the PVA fiber and the basalt fiber are not easy to be corroded by harmful ions, the performance of the PVA fiber and the basalt fiber can be kept for a long time, and the cost is lower.
(5) The invention adopts the iron tailing sand as the admixture, thereby effectively realizing green energy conservation and high-efficiency recycling of resources.
Drawings
FIG. 1 is a flowchart illustrating the operation of the present invention.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples.
In the following examples and comparative examples, unless otherwise specified, the starting materials or processing techniques are all those which are conventional commercially available in the art.
The following examples and comparative examples were carried out to prepare the desired products according to the preparation method as described in fig. 1. The method comprises the following steps:
(1) Preparing each raw material;
(2) Adding the water reducer into water in advance, and fully and uniformly mixing to obtain a water reducer solution;
(3) Mixing the rest raw materials except the reinforcing fibers, adding the mixture into the water reducing agent solution in the step (2), and stirring at a low speed of 40+/-5 rpm for 2min to obtain a mixed solution;
(4) Slowly adding the reinforcing fiber powder into the mixed solution in the step (3), and stirring at 285+/-10 rpm for 2min at a high speed to obtain mortar;
(5) Pouring the mortar in the step (4) into a mould, and vibrating to obtain a target product.
And finally, detecting the performance of the target product.
The above embodiments are described in more detail below with reference to specific examples.
Example 1:
the embodiment provides an early-strength ultrahigh-performance cement-based material for rapid reinforcement of a flexural member, which comprises the following raw material components in parts by weight: 350 parts of sulphoaluminate cement, 100 parts of silicate 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 reducer and 150 parts of water.
Example 2:
the embodiment provides an early-strength ultrahigh-performance cement-based material for rapid reinforcement of a flexural member, which comprises the following raw material components in parts by weight: 350 parts of sulphoaluminate cement, 50 parts of silicate cement, 100 parts of mineral powder, 500 parts of quartz sand, 500 parts of machine-made sand, 20 parts of PVA fiber, 20 parts of latex powder, 1 part of cellulose ether, 4 parts of water reducer and 150 parts of water.
Example 3:
the embodiment provides an early-strength ultrahigh-performance cement-based material for rapid reinforcement of a flexural member, which comprises the following raw material components in parts by weight: 350 parts of sulphoaluminate cement, 100 parts of silicate 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 water reducer and 150 parts of water.
Example 4:
the embodiment provides an early-strength ultrahigh-performance cement-based material for rapid reinforcement of a flexural member, which comprises the following raw material components in parts by weight: 350 parts of sulphoaluminate cement, 100 parts of silicate 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 water reducer and 150 parts of water.
Example 5:
the embodiment provides an early-strength ultrahigh-performance cement-based material for rapid reinforcement of a flexural member, which comprises the following raw material components in parts by weight: 1000 parts of 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 water reducer and 300 parts of water.
Comparative example 1:
the difference from example 1 is that: non-sulphoaluminate cement.
Comparative example 2:
the difference from example 4 is that: PVA fibers were not incorporated.
Comparative example 3:
the difference from example 4 is that: basalt fibers are not doped.
The main performance indexes of the above examples and comparative examples are shown in table 1:
TABLE 1 principal Properties of Cement-based materials
As can be seen from Table 1, the coagulation time of the embodiment of the invention is between 26 and 35 minutes, thereby meeting the requirement of rapid repair; the flexural strength of the steel is between 5.6MPa and 6.1MPa in 4 hours; the 3d flexural strength is between 8.0MPa and 8.6MPa, and the product has early strength and high strength performance; 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 has better toughness; has low diffusion coefficient of chlorine ion resistance and good durability. And compared with a single factor change control example, the embodiment has better performance indexes, and shows the importance of the mixed blend of the sulphoaluminate cement and the fiber to the invention.
The previous description of the embodiments is provided to facilitate a person of ordinary skill in the art in order to make and use the present invention. It will be apparent to those skilled in the art that various modifications can be readily made to these embodiments 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-described embodiments, and those skilled in the art, based on the present disclosure, should make improvements and modifications without departing from the scope of the present invention.
Claims (8)
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:
the cementing material is a combination of sulphoaluminate cement, silicate cement and mineral powder, wherein the proportion of the sulphoaluminate cement to the silicate cement to the mineral powder is 7:1:2-7:2:1;
the reinforcing fibers are a combination of PVA fibers and basalt fibers, the dosage of the PVA fibers is 10-20 parts, and the dosage of the basalt fibers is 20-40 parts;
the PVA fiber is PVA fiber with surface coated with an oiling agent, and the oiling agent accounts for 12% of the mass of the PVA fiber.
2. An early strength ultra high performance cement-based material for rapid strengthening of flexural members according to claim 1, wherein said aggregate is selected from any one or a combination of quartz sand, machine sand or iron tailings;
the aggregate is formed by mixing particles with the particle sizes of 0.125-0.212 mm, 0.212-0.425 mm, 0.425-0.85 mm and 0.85-2 mm, and the mass ratio of aggregate particles with the particle sizes of 0.125-0.212 mm, 0.212-0.425 mm, 0.425-0.85 mm and 0.85-2 mm is 1:2:3:4.
3. The early strength ultra-high performance cement-based material for rapid reinforcement of a flexural member of claim 1, characterized in that the latex powder is an acetic acid-vinyl acetate copolymer.
4. An early strength ultra high performance cement based material for rapid strengthening of flexural elements as claimed in claim 1 wherein said cellulose ether has a viscosity of 400pa.s and residual moisture of less than 1%.
5. The early strength ultra-high performance cement-based material for rapid reinforcement of flexural member according to claim 1, characterized in that the water reducing agent is a polycarboxylate water reducing agent, and the water reducing rate is more than 35%.
6. A method for preparing an early strength ultra-high performance cement-based material for rapid reinforcement of a flexural member as claimed in any one of claims 1 to 5, comprising the steps of:
(1) Preparing each raw material;
(2) Adding the water reducer into water in advance, and uniformly mixing to obtain a water reducer solution;
(3) Mixing the rest raw materials except the reinforcing fibers, adding the mixture into the water reducing agent solution in the step (2), and stirring to obtain a mixed solution;
(4) Slowly adding the reinforcing fiber into the mixed solution obtained in the step (3), and stirring to obtain mortar;
(5) Pouring the mortar in the step (4) into a mould, and vibrating to obtain the early strength ultrahigh-performance cement-based material.
7. The method for preparing the early strength ultra-high performance cement-based material for rapid hardening of a flexural member according to claim 6, wherein the condition of stirring in the step (3) is: stirring for 2min at 40+ -5 rpm, wherein stirring conditions in the step (4) are 285+ -10 rpm.
8. Use of an early strength ultra high performance cement based material for rapid strengthening of a flexural member as claimed in any one of claims 1 to 5 as repair strengthening material for service damaged flexural members.
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| CN202211188056.5A CN115368091B (en) | 2022-09-28 | 2022-09-28 | Early-strength ultrahigh-performance cement-based material for rapid reinforcement of flexural member and preparation method thereof |
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| CN202211188056.5A CN115368091B (en) | 2022-09-28 | 2022-09-28 | Early-strength ultrahigh-performance cement-based material for rapid reinforcement of flexural member and preparation method thereof |
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| CN115368091B true CN115368091B (en) | 2023-08-29 |
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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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