CN111549648A - High-toughness combined beam and construction method thereof - Google Patents
High-toughness combined beam and construction method thereof Download PDFInfo
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- CN111549648A CN111549648A CN202010278675.8A CN202010278675A CN111549648A CN 111549648 A CN111549648 A CN 111549648A CN 202010278675 A CN202010278675 A CN 202010278675A CN 111549648 A CN111549648 A CN 111549648A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
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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
- C04B28/04—Portland cements
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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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
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
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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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides a high-toughness composite beam and a construction method thereof, wherein the composite beam comprises an SWCP-PVA-ECC tension side protection layer, a grid layer arranged on the protection layer, a sizing material arranged on the grid layer, and a reinforced concrete material layer arranged on the sizing material layer. The invention solves the problems that ceramic waste is not reasonably utilized, and the produced cement releases a large amount of carbon dioxide to the environment to aggravate the greenhouse effect. In addition, the SWCP (solid waste ceramic powder) belongs to recycled admixture, and the recycling of the SWCP can not only reduce the environmental pollution, but also save the cost and non-renewable resources.
Description
Technical Field
The invention particularly relates to a high-toughness composite beam and a construction method thereof, belonging to the technical field of building engineering and bridge engineering.
Background
The beams may enhance the structural integrity, and the beams and columns may form a framework system of the structure, thereby supporting the stability of the structure. The plate is a heavy structure directly bearing load, and the beam can effectively transfer the load borne by the plate to the column, so that the load is gradually transferred to the foundation and the foundation. The bearing capacity and the deformation performance of the beam directly affect the service life of the whole structure, so the method has higher requirements on the material selection and the construction process of the beam.
As a big country for ceramic production and consumption, China statistically generates about one million tons of ceramic waste materials every year, and most of the waste materials are directly transported to the periphery of cities to be dumped, so that the waste materials are not effectively utilized. Along with the increase of time, the ceramic waste material accumulation amount is more and more, not only occupies a large using area, but also causes serious environmental pollution.
The beams in the existing structure are mostly made of reinforced concrete materials, as is well known, common concrete is prepared by gelled materials, coarse and fine aggregates, water and other additives according to a certain proportion, cement in the gelled materials accounts for the main part, a large amount of resources such as standard coal, limestone and clay can be consumed in cement production, a large amount of carbon dioxide can be released into the environment in the cement production, the carbon dioxide released into the atmosphere is approximately 5-7% in the cement production, and the greenhouse effect can be intensified.
ECC is a fiber reinforced cement-based composite material developed based on fracture mechanics and micromechanics, and compared with a common concrete material, ECC has higher toughness and crack resistance, and the tight cracks enable ECC to keep lower permeability and have better self-repairing capability. The ECC has excellent performance, so that the service life of the ECC is prolonged by more than 2 times compared with that of the traditional concrete material, thereby reducing the maintenance times in the whole life cycle and having better environmental protection and sustainability.
The PVA fiber is a new synthetic fiber developed mainly from polyvinyl alcohol and used in spinning industry, and has the advantages of high strength, high elastic modulus, good cohesiveness and dispersibility, no toxicity and no public nuisance, and is one of the new generation of high-tech green materials. The PVA fiber is doped into the cement-based composite material, so that the generation and development of cracks can be effectively inhibited. SWCP with a large amount of SiO therein2The hydration in the cementing material can be promoted, the SWCP can change the chemical composition and the particle size in the cementing material, and the bonding strength between the matrix and the PVA fiber can be effectively improved, so that the bearing capacity and the deformation performance of the PVA-ECC material can be improved. Therefore, the solid waste SWCP is doped into the PVA-ECC to replace part of the cement dosage, thereby not only solving the problem of environmental pollution, but also developing a new direction for the future of PVA-ECC materials.
Disclosure of Invention
The invention aims at the problems that most of the ceramic waste materials proposed in the background technology are directly transported to the periphery of a city to be dumped, the ceramic waste materials are not effectively utilized, a large amount of resources such as standard coal, limestone and clay are consumed in the production process of cement, a large amount of carbon dioxide is released to the environment in the production process of the cement, and the greenhouse effect is aggravated, and provides a high-toughness combined beam and a construction method thereof.
The invention provides a high-toughness composite beam which comprises a tension area protective layer thin plate, a grid layer, a sizing agent layer and a reinforced concrete layer, wherein the tension area protective layer thin plate is used as a tension side protective layer and is positioned at the lowest part, the grid layer, the sizing agent layer and the reinforced concrete layer are sequentially arranged above the tension area protective layer thin plate from bottom to top, the tension area protective layer thin plate is a solid waste ceramic powder/polyvinyl alcohol fiber reinforced cement-based composite material, and the proportion of the composite material is 126.4kg/m cement3884.8kg/m of fly ash3252.8kg/m of solid waste ceramic powder3455kg/m of quartz sand3303kg/m of water3Polyvinyl alcohol fiber 26kg/m3The water reducing agent accounts for 1.3 percent of the mixing amount of the cementing material, the defoaming agent accounts for 0.3 percent of the mixing amount of the cementing material, and the thickening agent accounts for 0.08 percent of the mixing amount of the cementing material. The cementing material is a gelatinous mixture formed by cement, fly ash, solid waste ceramic powder, quartz sand, water and polyvinyl alcohol fiber.
Preferably, the solid waste ceramic powder is 300 meshes.
Preferably, the polyvinyl alcohol fibers are Kevlan type K-II.
Preferably, the mesh layer is a carbon fiber mesh layer.
Preferably, the grid of the grid layer is square.
Preferably, the tensile strength of the grid layer is 1350MPa, and the elastic modulus is 125GPa
Preferably, the sizing material layer is made of bisphenol A type epoxy resin and the dosage of the bisphenol A type epoxy resin is 0.4-0.5kg/m2。
Preferably, the size layer is uniformly sprayed on the mesh layer.
The construction method of the high-toughness composite beam specifically comprises the following steps:
(1) prefabricating a tension area protective layer thin plate according to the actual size of the project, wherein the tension area protective layer thin plate is used for a tension side protective layer of the high-toughness composite beam;
(2) laying a square grid layer on the tensile zone protection layer thin plate;
(3) uniformly spraying a sizing layer in the square grid layer;
(4) paving reinforcing steel bars on the sizing material layer, and binding according to the standard requirement;
(5) and pouring a concrete material on the bound reinforcement cage to form a reinforced concrete layer.
The high-toughness composite beam has the beneficial effects that:
1. the grid layer of the invention mainly has the functions of uniformly spraying the sizing material and enhancing the direct bonding property of the protective layer thin plate in the tensile region and the upper reinforced concrete; the glue layer not only plays a role in water resistance, but also can effectively play a role in bonding; the use of the SWCP-PVA-ECC material of the tension zone protective layer thin plate not only can effectively utilize solid waste garbage, reduce environmental pollution and enlarge land use area, but also can effectively improve the bending resistance of the beam, improve the durability of the beam and prolong the service life of the beam. The material has the advantages of self-compaction, fatigue resistance, self-healing property, cleanness, environmental protection and the like, and can reduce the cost of the structure to a certain extent.
2. The SWCP-PVA-ECC tensile side protection layer comprises a grid layer arranged on the protection layer, a sizing material arranged on the grid layer and a reinforced concrete material layer arranged on the sizing material layer. The SWCP-PVA-ECC material is used for replacing the existing common concrete, so that the shearing resistance and bending resistance bearing capacity of the beam can be enhanced, and the impermeability of the beam is improved, thereby reducing the maintenance and repair times of the beam and prolonging the service life of the beam. In addition, the SWCP (solid waste ceramic powder) belongs to recycled admixture, and the recycling of the SWCP can not only reduce the environmental pollution, but also save non-renewable energy and achieve the effect of waste utilization.
3. The construction method has the advantages of simple construction process, no need of protective layer cushion blocks, accurate and attractive effect, laying a good foundation for subsequent construction, high construction efficiency, good material environmental protection performance, good bending resistance and long service life, playing a certain role in promoting the resource utilization of solid wastes and the sustainable development of a circular economy industrial system, and having good development prospect.
Drawings
FIG. 1 is a schematic structural view of a high-toughness composite beam according to the present invention;
reference numerals: 1-tensile zone protective layer sheet; 2-a mesh layer; 3-a sizing layer; 4-reinforced concrete layer.
Detailed Description
The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings:
the first embodiment is as follows: the present embodiment is explained with reference to fig. 1. The high-toughness composite beam comprises a tension area protection layer thin plate 1, a grid layer 2, a sizing material layer 3 and a reinforced concrete layer 4, wherein the tension area protection layer thin plate 1 is positioned at the lowest part as a tension side protection layer, the grid layer 2, the sizing material layer 3 and the reinforced concrete layer 4 are sequentially arranged above the tension area protection layer thin plate 1 from bottom to top,
the tension zone protective layer thin plate 1 is made of solid waste ceramic powder/polyvinyl alcohol fiber reinforced cement-based composite material (SWCP-PVA-ECC) and the proportion of the cement is 126.4kg/m3884.8kg/m of fly ash3252.8kg/m of solid waste ceramic powder3455kg/m of quartz sand3303kg/m of water3Polyvinyl alcohol fiber 26kg/m3The water reducing agent accounts for 1.3 percent of the mixing amount of the cementing material, the defoaming agent accounts for 0.3 percent of the mixing amount of the cementing material, the thickening agent accounts for 0.08 percent of the mixing amount of the cementing material, the solid waste ceramic powder is 300 meshes, and the polyvinyl alcohol fiber is K-II type colander. The cementing material is a gelatinous mixture formed by cement, fly ash, solid waste ceramic powder, quartz sand, water and polyvinyl alcohol fiber.
The tension zone protective layer thin plate 1 is made of SWCP-PVA-ECC materials, wherein SWCP refers to solid waste ceramic powder, the solid waste ceramic powder is made through the processes of recovery, processing, grinding and the like, and the ceramic powder contains a large amount of active SiO2The hydration of the PVA-ECC material is promoted, and the grain diameter of the ceramic powder grains is smaller than that of the cement grains, so that the PVA-ECC material can play an effective filling role. In addition, the cement production process consumes large amounts of non-renewable energy and releases large amounts of CO2Causing a greenhouse effect. And the SWCP recycled material is doped into PVA-ECC to manufacture a composite beam tension side protective layer thin plate, and the square grid is arranged on the upper side of the protective layer. The use of the SWCP-PVA-ECC can relieve the environmental pressure, and the material has high bending resistance, and has the advantages of high toughness, small pollution, good impermeability and the like.
The mixing proportion of the SWCP-PVA-ECC is 126.4kg/m of cement3(P.O 42.5.5), fly ash 884.8kg/m3(first grade), 252.8kg/m3(300 mesh) of ceramic powder and 455kg/m of quartz sand3303kg/m of water326kg/m of fiber3(K-II type colar fiber), water reducing agent (modified polycarboxylate)) Is 1.3 percent of the mixing amount of the gelled material, 0.3 percent of the defoaming agent and 0.08 percent of the mixing amount of the gelled material.
The grid layer 2 is a carbon fiber grid layer. The grid of the grid layer 2 is square. The tensile strength of the grid layer 2 is 1350MPa, and the elastic modulus is 125 GPa. It should be noted that the grid in the grid layer 2 disclosed in this embodiment is a square grid, and those skilled in the art may select other shapes and sizes as needed. The grid mesh layer 2 of the invention mainly has the functions of enabling glue to be sprayed uniformly, enhancing the direct bonding property of the SWCP-PVA-ECC and the upper reinforced concrete, having better integrity and flatter surface.
The sizing material layer 3 is evenly sprayed on the grid layer 2. The sizing material layer 3 is made of bisphenol A type epoxy resin, and the dosage is 0.4-0.5kg/m2. It should be noted that, in this embodiment, the amount and the amount of the sizing material can be adjusted according to actual situations, and the sizing material layer 3 is bisphenol a type epoxy resin and meets the quality requirement of "bisphenol a type epoxy resin" (GB/T13657-. The glue layer 3 not only plays a role in water resistance, but also can effectively play a role in bonding; the use of the SWCP-PVA-ECC material not only can effectively utilize solid waste garbage, reduce environmental pollution and enlarge land use area, but also can effectively improve the bending resistance of the beam, improve the durability of the beam and prolong the service life of the beam.
The material has the advantages of self-compaction, fatigue resistance, self-healing property, cleanness, environmental protection and the like, and can reduce the cost of the structure to a certain extent.
The reinforced concrete layer 4 is determined according to the actual engineering requirements.
The construction method of the high-toughness composite beam specifically comprises the following steps:
(1) prefabricating a tension area protective layer thin plate 1 according to the actual size of the project, wherein the tension area protective layer thin plate is used for a tension side protective layer of the high-toughness composite beam;
(2) laying a square grid layer 2 on the tension area protective layer thin plate 1;
(3) uniformly spraying a sizing material layer 3 in the square grid layer 2;
(4) paving reinforcing steel bars on the sizing material layer 3, and binding according to the standard requirement;
(5) and (5) pouring a concrete material on the bound reinforcement cage to form a reinforced concrete layer 4.
The construction method has the advantages of simple process, high construction efficiency, good effect, good material environmental protection performance, good bending resistance and long service life, plays a certain role in promoting the resource utilization of solid wastes and a sustainable development circular economy industry system, and has good development prospect.
The above-mentioned embodiments further explain the objects, technical solutions and advantages of the present invention in detail. It should be understood that the above-mentioned embodiments are only examples of the present invention, and are not intended to limit the present invention, and that the reasonable combination of the features described in the above-mentioned embodiments can be made, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The high-toughness composite beam is characterized by comprising a tension area protective layer thin plate (1), a grid layer (2), a sizing material layer (3) and a reinforced concrete layer (4), wherein the tension area protective layer thin plate (1) is used as a tension side protective layer and is positioned at the lowest part, the grid layer (2), the sizing material layer (3) and the reinforced concrete layer (4) are sequentially arranged above the tension area protective layer thin plate (1) from bottom to top,
the tension zone protective layer thin plate (1) is a solid waste ceramic powder/polyvinyl alcohol fiber reinforced cement-based composite material, and the proportion of the solid waste ceramic powder/polyvinyl alcohol fiber reinforced cement-based composite material is 126.4kg/m of cement3884.8kg/m of fly ash3252.8kg/m of solid waste ceramic powder3455kg/m of quartz sand3303kg/m of water3Polyvinyl alcohol fiber 26kg/m3The water reducing agent accounts for 1.3 percent of the mixing amount of the cementing material, the defoaming agent accounts for 0.3 percent of the mixing amount of the cementing material, and the thickening agent accounts for 0.08 percent of the mixing amount of the cementing material.
2. The high toughness composite beam as claimed in claim 1, wherein said solid waste ceramic powder is 300 mesh.
3. The high tenacity composite beam of claim 1, wherein said polyvinyl alcohol fibers are type K-ii collon.
4. The high tenacity composite beam of claim 1 wherein said mesh layer (2) is a carbon fiber mesh layer.
5. The high toughness composite beam according to claim 1, wherein said lattice of said lattice layer (2) is square.
6. The high toughness composite beam according to claim 1, wherein said mesh layer (2) has a tensile strength of 1350MPa and an elastic modulus of 125 GPa.
7. The high-toughness composite beam as claimed in claim 1, wherein said binder layer (3) is made of bisphenol A type epoxy resin in an amount of 0.4-0.5kg/m2。
8. The high-toughness composite beam as claimed in claim 1, wherein said binder layer (3) is uniformly sprayed on said mesh layer (2).
9. A method of constructing a high toughness composite beam as claimed in any one of claims 1 to 8, which comprises the steps of:
(1) prefabricating a tension area protective layer thin plate (1) according to the actual engineering size, wherein the tension area protective layer thin plate is used for a tension side protective layer of a composite beam;
(2) laying a square grid layer (2) on the tension area protective layer thin plate (1);
(3) uniformly spraying a sizing material layer (3) in the square grid layer (2);
(4) paving reinforcing steel bars on the glue layer (3) and binding according to the standard requirement;
(5) and (5) pouring concrete materials on the bound reinforcement cage to form a reinforced concrete layer (4).
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| US9499975B2 (en) * | 2012-12-20 | 2016-11-22 | Georgia-Pacific Gypsum Llc | Building materials, compositions, and methods |
| CN103449786A (en) * | 2013-09-13 | 2013-12-18 | 武汉理工大学 | Cement-based composite material for steel box girder bridge deck, as well as preparation and pavement thereof |
| CN104563389A (en) * | 2014-12-22 | 2015-04-29 | 扬州大学 | High-strength reinforced and functionally-graded concrete beam |
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