CN110746198A - Light high-strength concrete member and preparation method thereof - Google Patents
Light high-strength concrete member and preparation method thereof Download PDFInfo
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- CN110746198A CN110746198A CN201911105416.9A CN201911105416A CN110746198A CN 110746198 A CN110746198 A CN 110746198A CN 201911105416 A CN201911105416 A CN 201911105416A CN 110746198 A CN110746198 A CN 110746198A
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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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- 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
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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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
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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Abstract
The invention provides a lightweight high-strength concrete member and a preparation method thereof. The method comprises the following steps: (1) laying a conductive wire at a preset position of the concrete mould; (2) pouring to form a concrete member and maintaining for a preset time; (3) contacting the concrete member with a polymer solution so that the conductive wires in the concrete member and the polymer solution can form a circuit, and applying a voltage to carry out electrophoretic dipping; and (4) heating the concrete member impregnated with the polymer to cure the polymer. The invention utilizes shale ceramsite or clay ceramsite as coarse aggregate and silica fume or superfine mineral powder as active admixture to optimize the grain composition of the cementing material, thereby improving the strength of the concrete member. In addition, the polar polymer is impregnated into the concrete member through electrophoretic impregnation, and then the polar polymer is cured and filled in capillary pores in the concrete member, so that the compactness of the concrete member is increased, and the durability, the strength and the toughness of the concrete member are improved.
Description
Technical Field
The invention belongs to the technical field of concrete, and particularly relates to a lightweight high-strength concrete member and a preparation method thereof.
Background
Concrete is the largest man-made material used in the construction industry, and is widely applied to the civil engineering and construction industry due to low production cost and excellent performance. The apparent density of the ordinary concrete is 2200kg/m3-2500kg/m3And the compressive strength is generally not more than 100MPa, and the specific strength value is lower. When used in many structures, the weight of the structure is large, and a large structural area is required, so that the structure bears the external load and the weight of the structure. If the specific strength of concrete is increased to maintain the strength and the apparent density is decreased, the structural section is decreased to increase the building space, and other properties are improved because the apparent density of concrete is low.
The existing lightweight concrete mainly realizes lower apparent density by adding lightweight aggregate, and the lightweight aggregate generally comprises artificial ceramsite and calcined shale ceramsite, so the lightweight concrete is also called lightweight aggregate concrete or ceramsite concrete. As the ceramsite contains a large number of pores and has low density, the apparent density of the ceramsite concrete is lower than that of common concrete, and the large number of pores can cause the concrete to generate certain heat preservation effect. Currently, ceramsite concrete is classified into heat-insulating ceramsite concrete (for example, ceramsite concrete used on non-load-bearing internal and external partition walls), heat-insulating and load-bearing ceramsite concrete used on load-bearing external walls, and structural ceramsite concrete used in general concrete structures according to the strength and heat-insulating property of the ceramsite concrete. Besides the small weight of the ceramsite concrete, the thermal insulation, sound insulation and earthquake resistance of the ceramsite concrete are superior to those of common concrete, so that the strength of the ceramsite concrete is improved, the application range of the ceramsite concrete is greatly enlarged, and high social benefits are generated. The development of light high-strength concrete is a hot point of the current concrete research at home and abroad, and is also one of the concrete development directions.
In order to improve the strength and durability of concrete, in the prior art, impregnated concrete is sometimes adopted, specifically, hardened and dried concrete is immersed in an organic monomer, and the organic monomer is polymerized by heating or radiation to increase the compactness of the concrete, so as to improve the mechanical property of the concrete. In the prior art, a vacuum pumping mode is adopted to remove gas in concrete, so that negative pressure is generated to enhance the organic monomer to be immersed into the concrete. The invention patent with patent number 201610975628.2 and title of "a preparation process and construction method of self-dipping high-durability polymer concrete from vacuum surface inside" proposes a method for forming concrete by pouring, which utilizes hydration of cement in concrete to consume excessive moisture to generate vacuum degree, and polymer monomer on the surface of concrete enters into the concrete along with water to generate dipping effect. However, the organic monomer is a molecule having a large molecular weight, and receives a large resistance during the movement, thereby reducing the dipping effect. Furthermore, as the vacuum is reduced, the rate and ability of the polymer monomer to enter the concrete decreases, eventually stopping the impregnation.
Therefore, it is required to develop a method for preparing lightweight high-strength concrete so that the polymer monomer can be continuously introduced into the interior of the concrete, thereby enhancing the impregnation effect.
Disclosure of Invention
In one aspect, the present invention is directed to a method for preparing a lightweight high-strength concrete member, comprising the steps of:
(1) laying a conductive wire at a preset position of the concrete mould;
(2) pouring to form a concrete member and maintaining for a preset time;
(3) contacting the concrete member with a polymer solution so that the conductive wires in the concrete member and the polymer solution can form a circuit, and applying a voltage to carry out electrophoretic dipping;
(4) and heating the concrete member impregnated with the polymer to cure the polymer.
Preferably, in step (1), the predetermined position is a position such that the electrically conductive wire is finally located at the center of the concrete member.
Preferably, in step (2), the materials for casting to form the concrete member comprise coarse aggregate, fine aggregate, cementitious material, active admixture and high efficiency water reducing agent.
Preferably, in step (2), the material for casting to form the concrete member comprises: 1000-1400 parts of coarse aggregate, 700-900 parts of fine aggregate, 600-800 parts of cementing material, 100-200 parts of active admixture and 7-20 parts of high-efficiency water reducing agent.
Preferably, the coarse aggregate has a particle size of 1mm to 10mm, and is selected from the group consisting of a barrel pressure strength of 3.5MPa to 4.5MPa and a bulk density of 350kg/m3～380kg/m3The clay ceramsite or the cylinder pressure intensity is 7.5 MPa-8.5 MPa, and the bulk density is 870kg/m3～900kg/m3The shale ceramisite.
Preferably, the particle size of the fine aggregate is 0.01 mm-1.3 mm, and the fine aggregate is selected from continuous graded quartz sand or river sand.
Preferably, the cementing material is selected from any one of portland cement and ordinary portland cement, and the strength grade of the cementing material is 42.5, 52.5 or 62.5.
Preferably, the cementitious material is portland cement having a strength grade of 52.5 or 62.5.
Preferably, the active admixture is selected from silica fume with the original ash fineness of more than or equal to 20000 meshes or ultrafine mineral powder with the fineness of more than or equal to 2000 meshes.
Preferably, the high-efficiency water reducing agent is selected from a fatty acid water reducing agent or a polycarboxylic acid water reducing agent, and the water reducing rate of the water reducing agent is more than 30%.
Preferably, the polymer solution is a solution having water dispersibility and thermosetting properties.
Preferably, the polymer solution is one of a polyurethane solution, an epoxy resin solution, or a polyacetal resin solution.
Preferably, in the step (3), the voltage for the electrophoretic dipping is 150-200V, and the electrophoresis time is 10-20 minutes.
Preferably, in step (4), the concrete element is heated with hot water.
On the other hand, the invention also provides a lightweight high-strength concrete member which is prepared by the method.
Preferably, the apparent density of the lightweight high-strength concrete member is 1800m2/kg～1950m2The standard compressive strength of the steel is 75MPa to 135 MPa.
The method provided by the invention uses shale ceramsite or clay ceramsite with small bulk density as the coarse aggregate, so that the weight of the concrete is obviously reduced. In addition, the silica fume or the superfine mineral powder used as the active admixture optimizes the grain composition of the cementing material and improves the strength of the concrete member.
In addition, the invention enables the polar polymer to be fully impregnated into the concrete member through electrophoretic impregnation, and then the polymer is cured under the action of heating or radiation, so that capillary pores in the concrete member are filled, the compactness of the concrete member is greatly increased, and the durability, the strength and the toughness of the concrete member are improved. The apparent density of the lightweight high-strength concrete member is 1800m2/kg～1950m2The standard compressive strength of the steel is 75MPa to 135 MPa.
Drawings
Fig. 1 is a schematic flow diagram of a method of manufacturing a lightweight high-strength concrete member according to the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention is provided in conjunction with the accompanying drawings, and the embodiments are merely illustrative of the technical solutions of the present invention, and the scope of the present invention is not limited thereto.
Fig. 1 shows a schematic flow diagram of the method of the invention for producing a lightweight high-strength concrete component. The method generally includes steps S1-S4.
In step S1, a concrete casting mold is erected and a conductive wire is laid at the center of the mold, preferably such that the conductive wire is finally located at the center of the concrete member formed by casting. The conductive wire is preferably a copper conductive wire.
At step S2, a casting is constructed using the concrete material and cured to a predetermined time to form a concrete member. Preferably, the curing time lasts 28 days.
In step S3, the concrete member formed in step S2 is brought into sufficient contact with a polymer solution, and subjected to electrophoretic dipping. The concrete member is embedded with a conductive wire, after the concrete member is fully contacted with the polymer solution, the conductive wire embedded in the concrete member is connected with a power supply electrode, the other electrode is connected with the polymer solution, and the polymer with polarity flows along with the current generation under the action of voltage to enter the concrete member to form the impregnated concrete member. Under the action of voltage, the polymer continuously enters the interior of the concrete member, and the concrete member is fully impregnated.
In step S4, the concrete member after being in sufficient contact with the polymer is heated or radiated to cure the polymer, thereby filling the capillary pores in the concrete member, increasing the compactness of the concrete member, and improving the durability, strength and toughness of the concrete member.
In step S2, the materials for casting the concrete member include coarse aggregate, fine aggregate, cementitious material, reactive admixture, and high efficiency water reducer.
Coarse boneThe grain diameter of the material is 1 mm-10 mm, and the material is selected from the group consisting of the cylinder pressure strength of 3.5 MPa-4.5 MPa and the bulk density of 350kg/m3～380kg/m3The clay ceramsite or the cylinder pressure intensity is 7.5 MPa-8.5 MPa, and the bulk density is 870kg/m3～900kg/m3The shale ceramisite. The coarse aggregate is preferably shale ceramsite with the particle size of 1-5 mm, the cylinder pressure strength of 8.1-8.5 MPa and the bulk density of 870kg/m3～900kg/m3。
The fine aggregate has a particle size of 0.01mm to 1.3mm, and is preferably selected from continuous-graded quartz sand or river sand. More preferably, the fine aggregate is continuous graded quartz sand having a particle size of 0.01mm to 1.25 mm.
The cementing material is selected from any one of portland cement and ordinary portland cement, and the strength grade of the cementing material is one of 42.5, 52.5 or 62.5. The cementitious material is preferably portland cement having a strength grade of 52.5 or 62.5.
The active admixture is selected from silica fume with the original ash fineness not less than 20000 meshes or ultrafine mineral powder with the fineness not less than 2000 meshes. The active admixture is preferably silica fume with the original ash fineness of more than 20000 meshes, wherein SiO is2The content is more than or equal to 90 percent.
The high-efficiency water reducing agent is selected from a fatty acid water reducing agent or a polycarboxylic acid water reducing agent, and the water reducing rate is more than 30%. The high-efficiency water reducing agent is preferably a polycarboxylic acid water reducing agent, and the water reducing rate is more than 33%.
The material mixing ratio parameters for pouring to form the concrete member are as follows: 1000-1400 parts of coarse aggregate, 700-900 parts of fine aggregate, 600-800 parts of cementing material, 100-200 parts of active admixture, 140-250 parts of water and 7-20 parts of high-efficiency water reducing agent.
Further preferably, the material mixing ratio for casting the concrete member is as follows: 1000 to 1200 parts of a material having a particle diameter of 1 to 5mm, a barrel pressure strength of 8.1 to 8.5MPa, and a bulk density of 870kg/m3～900kg/m3The shale ceramsite is used as coarse aggregate; 800-850 parts of continuous graded quartz sand with the grain diameter of 0.01-1.25 mm as fine aggregate; 600-720 parts of Portland cement with the strength grade of 52.5 or 62.5 as a cementing material; 100-150 parts of silica fume as an active admixture; 140-180 parts of water; 15-18 parts of water reducing rate is more thanAnd (3) taking 30% of polycarboxylic acid water reducing agent as a high-efficiency water reducing agent.
The polymer solution is preferably a polar polymer solution having water dispersibility and thermosetting properties. The polymer solution is preferably a polyurethane solution, a polyacetal resin solution or an epoxy resin solution.
In step S3, the voltage for electrophoresis dipping is 150-200V, and the electrophoresis time is 10-20 minutes.
In step S4, the concrete member is preferably heated with hot water. It is further preferred that the concrete is heated with hot water at 90 ℃.
The apparent density of the lightweight high-strength concrete member prepared by the method is 1800m2/kg～1950m2The standard compressive strength of the steel is 75MPa to 135 MPa.
To further assist in understanding the technical aspects of the present application, several specific examples are provided below.
Example 1
The material mixing ratio for forming the concrete member by pouring in the embodiment is as follows: 1050 parts of continuous gradation with the grain diameter of 1mm to 5mm, the cylinder pressure strength of 8.1MPa and the bulk density of 870kg/m3The shale ceramsite is used as coarse bone particles; 750 parts of continuous graded quartz sand with the grain diameter of 0.01 mm-1.25 mm is used as fine bone particles; 600 parts of ordinary portland cement with the strength grade of 52.5 serving as a cementing material; 100 portions of SiO with the fineness of 20000 meshes2The silica fume with the content of 90 percent is used as an active admixture; 140 parts of water; 8 parts of polycarboxylic acid high-efficiency water reducing agent.
The polyacetal resin solution was used as a polymer solution for electrophoretic impregnation.
Adding ordinary portland cement, silica fume and quartz sand into a stirrer, stirring for 1-2 minutes, and adding water to form mortar. Soaking the shale ceramisite in water for 1 hour, fishing out and airing until no water drops, and mixing and stirring the shale ceramisite and mortar for 3 minutes to form concrete.
Erecting a concrete template, and embedding a copper conducting wire in the middle of the template.
Pouring the prepared concrete into a concrete template with a pre-embedded conductive wire, vibrating, and curing for 28 days to form the concrete member.
Then, a polyacetal resin solution having an average molecular weight of 10000 to 15000 and a solid content of 40% to 50% is diluted with water to a solid content of 10% to 15% to prepare a polyacetal resin solution.
Putting the concrete member into the polyacetal resin solution to make the concrete member fully contact with the polyacetal resin solution, then connecting the two electrodes of the power supply to the copper conducting wire in the polyacetal resin solution and the concrete member, and carrying out electrophoretic dipping under the conditions that the voltage is 150V and the electrophoretic time is 10 minutes.
And (3) putting the impregnated concrete member into hot water at 80 ℃ for heating for 2 hours to polymerize and cure the polyacetal resin monomer, thereby preparing the lightweight high-strength concrete member.
The prepared concrete member has standard compressive strength of 100MPa and apparent density of 1850m2/kg。
Example 2
The material mixing ratio for forming the concrete member by pouring in the embodiment is as follows: 1000 parts of continuous gradation with the grain diameter of 1mm to 10mm, the cylinder pressure strength of 4.0MPa and the bulk density of 370kg/m3The clay ceramsite is used as coarse bone particles; 850 parts of continuous graded quartz sand with the grain diameter of 0.01 mm-1.25 mm is used as fine bone particles; 650 parts of ordinary portland cement with the strength grade of 52.5 serving as a cementing material; 150 parts of superfine mineral powder with the fineness of 2000 meshes and the activity index of 105 as an active admixture; 160 parts of water; 16 parts of a fatty acid high-efficiency water reducing agent.
The epoxy resin solution was used as the polymer solution for electrophoretic impregnation.
And adding the ordinary portland cement, the superfine mineral powder and the quartz sand in the formula into a stirrer, stirring for 1-2 minutes, adding water, and uniformly mixing to form the mortar. And soaking the clay ceramsite in water for 1 hour, fishing out and airing until no water drops, and mixing and stirring the clay ceramsite with the mortar for 3 minutes to form the concrete.
Erecting a concrete template, and embedding a copper conducting wire in the middle of the template.
And pouring the concrete into a concrete template pre-embedded with the conductive wire, vibrating, and curing for 28 days to form the concrete member.
And then, adding water into the epoxy resin solution with the molecular weight of 5000-6000 and the solid content of 50% to dilute the epoxy resin solution until the solid content is 10% -15%, and preparing the epoxy resin solution.
Putting the concrete member into the epoxy resin solution to enable the concrete member to be fully contacted with the epoxy resin solution, then connecting the epoxy resin solution and a copper conducting wire in the concrete member with two electrodes of a power supply, and carrying out electrophoretic dipping under the conditions that the voltage is 200V and the electrophoretic time is 20 minutes.
And (3) putting the concrete member subjected to electrophoretic impregnation into hot water at 90 ℃ for heating for 3 hours to cure the epoxy resin, thus preparing the lightweight high-strength concrete member.
The prepared concrete member has the standard compressive strength of 90MPa and the apparent density of 1830m2/kg。
Example 3
The material mixing ratio for forming the concrete member by pouring in the embodiment is as follows: 1100 parts of continuous gradation with the grain diameter of 1mm to 5mm, the cylinder pressure strength of 8.5MPa and the bulk density of 900kg/m3The shale ceramsite is used as coarse bone particles; 800 parts of continuous graded quartz sand with the grain diameter of 0.01 mm-1.25 mm are used as fine bone particles; 750 parts of ordinary portland cement with the strength grade of 62.5 serving as a cementing material; 150 portions of SiO with the fineness of 20000 meshes2The silica fume with the content of 96 percent is used as an active admixture; 180 parts of water; 16 parts of a polycarboxylic acid high-efficiency water reducing agent.
The polyurethane solution was used as the polymer solution for electrophoretic dipping.
And adding the ordinary Portland cement, the silica fume and the quartz sand in the formula into a stirrer, stirring for 2-3 minutes, and adding water for mixing to form the mortar. Soaking the shale ceramisite in water for 1 hour, fishing out and airing until no water drops, and mixing and stirring the shale ceramisite and mortar for 4 minutes to form concrete;
erecting a concrete template, and embedding a copper conducting wire in the middle of the template.
And pouring the concrete into a concrete template pre-embedded with the conductive wire, vibrating, and curing for 28 days to form the concrete member.
And then, diluting the polyurethane solution with the molecular weight of 1000-2000 and the solid content of 30-40% to the solid content of 10%, and preparing to obtain the polyurethane solution.
Putting the concrete member into polyurethane solution to enable the concrete member to be fully contacted with the polyurethane solution, then connecting the copper conducting wires in the polyurethane solution and the concrete member with two electrodes of a power supply, and carrying out electrophoretic dipping under the conditions that the voltage is 150V and the electrophoretic time is 15 minutes.
And (3) putting the soaked concrete member into hot water at the temperature of 90 ℃ for heating for 2 hours to polymerize and cure the polyurethane monomer, thereby obtaining the concrete member with light weight and high strength.
The prepared concrete member has the standard compressive strength of 130MPa and the apparent density of 1950m2/kg。
The foregoing detailed description and drawings are merely illustrative of the present invention for the purpose of facilitating a better understanding of the concepts of the invention, and are not intended to limit the scope of the invention. Variations of the invention may be made by those skilled in the art without departing from the spirit of the invention. Any modification or variation made without departing from the spirit of the present invention shall fall within the protection scope of the present invention.
Claims (16)
1. A method of making a lightweight high strength concrete member comprising the steps of:
(1) laying a conductive wire at a preset position of the concrete mould;
(2) pouring to form a concrete member and maintaining for a preset time;
(3) contacting the concrete member with a polymer solution so that the conductive wires in the concrete member and the polymer solution can form a circuit, and applying a voltage to carry out electrophoretic dipping; and the number of the first and second groups,
(4) and heating the concrete member impregnated with the polymer to cure the polymer.
2. The method of producing a lightweight high-strength concrete member according to claim 1, characterized in that:
in the step (1), the predetermined position is a position such that the electrically conductive wire is finally located at the center of the concrete member.
3. The method of producing a lightweight high-strength concrete member according to claim 1, characterized in that:
in the step (2), the materials for casting and forming the concrete member comprise coarse aggregate, fine aggregate, cementing material, active admixture and high-efficiency water reducing agent.
4. A method of producing a lightweight high-strength concrete element according to claim 3, characterized in that:
materials for casting to form concrete members include: 1000-1400 parts of coarse aggregate, 700-900 parts of fine aggregate, 600-800 parts of cementing material, 100-200 parts of active admixture and 7-20 parts of high-efficiency water reducing agent.
5. The method of producing a lightweight high-strength concrete member according to claim 3 or 4, characterized in that:
the particle size of the coarse aggregate is 1-10 mm, and the coarse aggregate is selected from the group consisting of cylinder pressure strength of 3.5-4.5 MPa and bulk density of 350kg/m3～380kg/m3The clay ceramsite or the cylinder pressure intensity is 7.5 MPa-8.5 MPa, and the bulk density is 870kg/m3～900kg/m3The shale ceramisite.
6. The method of producing a lightweight high-strength concrete member according to claim 3 or 4, characterized in that:
the particle size of the fine aggregate is 0.01 mm-1.3 mm, and the fine aggregate is selected from continuous graded quartz sand or river sand.
7. The method of producing a lightweight high-strength concrete member according to claim 3 or 4, characterized in that:
the cementing material is any one of portland cement or ordinary portland cement, and the strength grade of the cementing material is one of 42.5, 52.5 or 62.5.
8. The method of producing a lightweight high-strength concrete member according to claim 3 or 4, characterized in that: the cementitious material is portland cement having a strength grade of 52.5 or 62.5.
9. A method of producing a lightweight high-strength concrete element according to claim 3, characterized in that:
the active admixture is selected from silica fume with the original ash fineness of more than or equal to 20000 meshes or superfine mineral powder with the fineness of more than or equal to 2000 meshes.
10. A method of producing a lightweight high-strength concrete element according to claim 3, characterized in that:
the high-efficiency water reducing agent is selected from a fatty acid water reducing agent or a polycarboxylic acid water reducing agent, and the water reducing rate of the water reducing agent is more than 30%.
11. The method of producing a lightweight high-strength concrete member according to claim 1, characterized in that:
the polymer solution is a polymer solution having water dispersibility and thermosetting properties.
12. The method for producing a lightweight, high-strength concrete structural member according to claim 11, wherein: the polymer solution is one of a polyurethane solution, an epoxy resin solution or a polyacetal resin solution.
13. The method of producing a lightweight high-strength concrete member according to claim 1, characterized in that:
in the step (3), the voltage for electrophoretic dipping is 150-200V, and the electrophoretic time is 10-20 minutes.
14. The method of producing a lightweight high-strength concrete member according to claim 1, characterized in that:
in step (4), the concrete member is heated with hot water.
15. A lightweight high strength concrete element produced by the method of any one of claims 1 to 14.
16. A concrete element according to claim 15 wherein: the apparent density of the light high-strength concrete member is 1800m2/kg～1950m2The standard compressive strength of the steel is 75MPa to 135 MPa.
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| CN112299786A (en) * | 2020-10-30 | 2021-02-02 | 国网山东省电力公司电力科学研究院 | Composite hollow sandwich concrete filled steel tube pole and preparation method thereof |
| CN114276072A (en) * | 2021-04-28 | 2022-04-05 | 山西瑞通路桥新技术有限公司 | Light high-performance concrete for assembled bridge and preparation method thereof |
| CN114956664A (en) * | 2022-06-22 | 2022-08-30 | 重庆市智翔铺道技术工程有限公司 | Epoxy resin modified polyurethane concrete and preparation method thereof |
| CN115594523A (en) * | 2022-10-21 | 2023-01-13 | 华南理工大学（Cn） | High-toughness cement-based composite material and preparation method thereof |
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| CN112299786A (en) * | 2020-10-30 | 2021-02-02 | 国网山东省电力公司电力科学研究院 | Composite hollow sandwich concrete filled steel tube pole and preparation method thereof |
| CN114276072A (en) * | 2021-04-28 | 2022-04-05 | 山西瑞通路桥新技术有限公司 | Light high-performance concrete for assembled bridge and preparation method thereof |
| CN114956664A (en) * | 2022-06-22 | 2022-08-30 | 重庆市智翔铺道技术工程有限公司 | Epoxy resin modified polyurethane concrete and preparation method thereof |
| CN114956664B (en) * | 2022-06-22 | 2023-11-17 | 重庆市智翔铺道技术工程有限公司 | Epoxy resin modified polyurethane concrete and preparation method thereof |
| CN115594523A (en) * | 2022-10-21 | 2023-01-13 | 华南理工大学（Cn） | High-toughness cement-based composite material and preparation method thereof |
| CN115594523B (en) * | 2022-10-21 | 2023-11-24 | 华南理工大学 | High-toughness cement-based composite material and preparation method thereof |
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