CN103771785B - Thermal-insulation steel fiber concrete and application and preparation method thereof - Google Patents
Thermal-insulation steel fiber concrete and application and preparation method thereof Download PDFInfo
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- CN103771785B CN103771785B CN201410030297.6A CN201410030297A CN103771785B CN 103771785 B CN103771785 B CN 103771785B CN 201410030297 A CN201410030297 A CN 201410030297A CN 103771785 B CN103771785 B CN 103771785B
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Abstract
The invention relates to thermal-insulation steel fiber concrete and application and a preparation method of the thermal-insulation steel fiber concrete for solving the technical problems that the concrete used in the existing architectural structure has poor tensile strength, bending resistance and thermal insulation property. The thermal-insulation steel fiber concrete is prepared from the following raw materials in parts by weight: 2-50 parts of steel fiber, 30-100 parts of glass bead, 300-500 parts of cement, 1100-1400 parts of stone, 450-600 parts of sand, 150-300 parts of water, 0.2-10 parts of additive and 50-100 parts of admixture. The thermal-insulation steel fiber concrete has good mechanical performance, anti-seismic performance and thermal insulation property which reach the requirements of the common architectural structure and also reach the requirements of special architectural structures on high-strength concrete with good thermal performance; therefore, the strength of structural parts is improved, the energy consumption of buildings is reduced greatly and the concrete disclosed by the invention meets the standard requirements of high-performance concrete developed in China.
Description
Technical field
The present invention relates to a kind of steel fiber thermal insulation concrete, particularly a kind of have high tensile, bending resistance, the concrete of ultimate compression strength and heat-insulating property and this concrete application and preparation method, belongs to concrete and preparing technical field thereof.
Background technology
At present, building structure more than 93% both domestic and external is skeleton construction, and the concrete used in these building structure is normal concrete.Normal concrete has good compressive property, and its tension, bending resistance, resistance to cleavage, heat-insulating property are very poor, therefore in order to improve the performances such as concrete tension, add the metallic substance such as reinforcing bar in concrete structure; The thermal conductivity of normal concrete is higher, heat-insulating property is very poor, and thermal conductivity reaches about 1.8W/mk, therefore for making building meet people and equipment to the demand of room temperature, peripheral structure all does the effective measure such as inside/outside thermal insulation layer to reduce indoor and outdoor heat exchange, to reach the effect of insulation.
For improving the deficiencies such as the tension of normal concrete, bending resistance, resistance to cleavage and poor thermal insulation property, need to increase the consumption of reinforcing bar in building structure or improve reinforcing bar grade, building inside/outside closed structure sets up thermal insulation layer.And increase amount of reinforcement or improve reinforcing bar the most direct grade problem and be just the increase in project total cost.Conventional insulation is organic insulation material, and when it makes, environmental pollution is serious and inflammable, and bring a lot of unsafe factor, cost also remains high.This is for china natural resources and the energy is all deficienter, the present situation of severe environmental pollution, and one is wasted greatly and wrecks beyond doubt.
Minimizing Reinforcing Steel Bar In Reinforced Concrete Structure consumption and heat-insulation system are two independently engineerings, two engineerings are placed in a concrete works and solve, not only can reduce the expenditure of human and material resources and financial resources, turn reduce when material of construction makes the pollution of environment and the waste to resource, the energy.Meet the requirement of China's Resources for construction saving type and friendly environment society, also meet the demand to structure energy-saving and building energy conservation simultaneously, significantly increase the shock resistance of structure, security, heat retaining property.At present, also do not report about the concrete research that there is high resistance to compression, high tensile, high bending resistance, high cracking resistance and there is heat-insulating property simultaneously both at home and abroad.
Summary of the invention
The object of the invention is to solve the concrete tension, the technical problem such as bending resistance and poor thermal insulation property that use in existing building structure, and provide a kind of good steel fiber thermal insulation concrete of high tensile, high bending resistance, high cracking resistance and heat-insulating property that simultaneously has, and provide this concrete preparation method.
The present invention is achieved by the following technical solutions:
A kind of steel fiber thermal insulation concrete, is made up of the raw material of following parts by weight: steel fiber 2-50 part, glass bead 30-100 part, cement 300-500 part, stone 1100-1400 part, sand 450-600 part, water 150-300 part, admixture 0.2-4 part, extra material 50-100 part; Wherein, described admixture can select concrete field to commonly use admixture, and as water reducer, retardant etc., described extra material can select concrete field to commonly use extra material, as flyash, silicon ash, slag etc.
Wherein, the useful length of described steel fiber is 10-60mm, diameter or equivalent diameter >=0.08mm.Steel fiber is a kind of high-tensile steel wires that can be added in concrete, different types of steel fiber is added in concrete can greatly improve concrete mechanical property, test proves that in concrete, add useful length is 10-60mm, the steel fiber of diameter (or equivalent diameter) >=0.08mm, the concrete strength produced and heat-insulating property are all the highest.
The particle diameter of described glass bead is 0.1-2mm, and thermal conductivity is 0.03-0.05W/mK, water-intake rate < 40%, melt temperature 1200 DEG C.Glass bead is a kind of inorganic heat preserving aggregate be added in concrete; vitrified micro-bead heat preserving aggregate and the maximum difference of normal expanded perlite are that glass bead water-intake rate is well below pearlstone, and having low water absorption is concrete weather resistance and the most basic guarantee reaching higher heat insulation effect.And the relation also having interwoveness of the particle diameter of glass bead and concrete strength.Lot of experiments proves, the tap density of glass bead is 110 ~ 130kg/m3, and particle diameter is 0.5-2.0mm, and thermal conductivity is 0.03-0.05W/mK, and the steel fiber thermal insulation concrete effect produced during water-intake rate < 40% is best.
It is 0.1-2% that described steel fiber accounts for concrete mass ratio, and it is 1-5% that glass bead accounts for concrete mass ratio.
The preparation method of described steel fiber thermal insulation concrete; comprise the steps: that this concrete-agitating order is for compound paddling process; because the water suction behavior of vitrified microsphere insulating material in whipping process directly can affect the workability of mixture, therefore glass bead should be carried out pre-wetted treatment.First the water of the glass bead of described ratio and 1/3 is dropped in stirrer; after mix 20-50 second; the extra material adding described ratio makes shell stirring to glass bead; form stable mixed material; thereafter again by described ratio cement, stone, sand, steel fiber, admixture and residue water evenly drop in stirrer, stir and namely obtain steel fiber thermal insulation concrete in 3-5 minute.
The application of described steel fiber thermal insulation concrete, it can be applied in Civil structure (as mixed in brick, framework, frame-cut and shear wall etc.) and special structure (as people's air defense, shock insulation building etc.), equally also can be applied in the higher and buildings that has particular requirement to intensity of insulation requirement and structures (as Nuclear power plants and military base, bridges and culverts etc.), this concrete is applied in buildings and structures, the intensity of structural member can be improved, significantly can reduce again the energy consumption of buildings, meet the standard-required of China's development high performance concrete.Steel fiber thermal insulation concrete of the present invention can not only meet the demand of concrete stress performance, anti-seismic performance and heat-insulating property in general building structure, can meet again extraordinary building structure to high strength and the good concrete demand of thermal property.
Following table is the mechanical property test result (volume content of steel fibers is different) of steel fiber thermal insulation concrete of the present invention:
Note: above ultimate compression strength is standard cube ultimate compression strength (MPa); Tensile strength is standard prism axial tensile strength (MPa).
The present invention compared with prior art has following beneficial effect:
1) fiber in the present invention adopts steel fiber, can effectively improve concrete tension, bending resistance, resistance to compression and slip resistance, and compared with normal concrete, its tensile strength improves 30 ~ 50%, and ultimate compression strength improves 20 ~ 40%; Make steel fiber thermal insulation concrete of the present invention can not only meet the demand of concrete stress performance, anti-seismic performance and heat-insulating property in general building structure, and extraordinary building structure can be met to high strength and the good concrete demand of thermal property, such as, building structure in high-layer shear force wall, military base and Nuclear power plants etc.
2) steel fiber is added in the present invention, can Substitute For Partial Framework Of Steel Reinforcement structure, when having same opposing external loads, reducing the consumption of reinforcing bar, saving great amount of cost, increasing economic efficiency.
3) add inorganic light weight thermal insulation material glass bead in the present invention, heat insulation effect is splendid, makes the present invention compare its thermal conductivity of normal concrete and reduces 30-40%; Because vitrified microsphere insulating material is light thermal-insulation aggregate, under the condition not reducing concrete strength, alleviate the deadweight of concrete structure, compare normal concrete steel fiber thermal insulation concrete of the present invention unit volume weight reduction 8-20%.
4) material cost of the present invention is low, light weight, insulation, and tension, bending resistance, shearing resistance, resistance to compression and twisting strength are high, and better, shock resistance, resistant abrasion ability are comparatively strong, and resistance to cleavage is good for weather resistance and fatigue resistance, meet the requirement of China's development high performance concrete.
5) be added with vitrified microsphere insulating material in starting material of the present invention, because glass bead has fire prevention, the performance such as high temperature resistant, anti-aging, concrete fire prevention, endurance quality etc. all increased.
6) steel fiber in the present invention and vitrified microsphere insulating material in concrete with other materials acting in conjunction, jointly play a role with reinforcing bar simultaneously, improve concrete over-all properties.
7) owing to improving concrete tension, bending resistance, antitorque and ultimate compression strength, and concrete has the performance of insulation concurrently, and this is an engineering relating to a system complex of all too many levels in aspect such as starting material, architectural scheme design and constructing operation.This, fundamentally solving the concrete various intensity of raising, improves concrete various performance, meets the methodology of systems engineering.The present invention is applied in building structure, can improve the intensity of structural member, significantly can reduce again the energy consumption of buildings, meets the standard-required of China's development high performance concrete.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described.
Embodiment 1
A kind of steel fiber thermal insulation concrete, comprises the raw material of following weight distribution ratio: steel fiber 10 parts, glass bead 20 parts, cement 500 parts, 1150 parts, stone, 560 parts, sand, 170 parts, water, admixture 6 parts, extra material 50 parts;
Prepare in accordance with the following steps: first the water of the glass bead of described ratio and 1/3 is dropped in stirrer; mix is after 30 seconds; add the extra material of described ratio again; stir full and uniform after; finally the cement of described ratio, stone, sand, steel fiber, admixture and residue water are evenly dropped in stirrer, stir and namely obtain steel fiber thermal insulation concrete in 3.5 minutes.
During concrete enforcement, the useful length of described steel fiber is 10-60mm, diameter or equivalent diameter >=0.08mm; The particle diameter of described glass bead is 0.1-2mm, and thermal conductivity is 0.03-0.05W/mK, water-intake rate < 40%, melt temperature 1200 DEG C; Described admixture is high-performance polycarboxylic acids water reducing agent, and described extra material is flyash.
Embodiment 2
A kind of steel fiber thermal insulation concrete, comprises the raw material of following weight distribution ratio: steel fiber 20 parts, glass bead 30 parts, cement 300 parts, 1400 parts, stone, 460 parts, sand, 230 parts, water, admixture 3 parts, extra material 60 parts; Wherein, described admixture is the retardant that this area is commonly used, and described extra material is slag.
Prepare in accordance with the following steps: first the water of the glass bead of described ratio and 1/3 is dropped in stirrer; mix is after 30 seconds; add the extra material of described ratio again; stir full and uniform after; finally the cement of described ratio, stone, sand, steel fiber, admixture and residue water are evenly dropped in stirrer, stir and namely obtain steel fiber thermal insulation concrete in 3 minutes.
Embodiment 3
A kind of steel fiber thermal insulation concrete, comprises the raw material of following weight distribution ratio: steel fiber 30 parts, glass bead 30 parts, cement 410 parts, 1250 parts, stone, 500 parts, sand, 200 parts, water, admixture 0.2 part, extra material 80 parts;
Prepare in accordance with the following steps: first the water of the glass bead of described ratio and 1/3 is dropped in stirrer; mix is after 30 seconds; add the extra material of described ratio again; stir full and uniform after; finally the cement of described ratio, stone, sand, steel fiber, admixture and residue water are evenly dropped in stirrer, stir and namely obtain steel fiber thermal insulation concrete in 5 minutes.
During concrete enforcement, the useful length of described steel fiber is 10-60mm, diameter or equivalent diameter >=0.08mm; Described admixture is the water reducer that this area is commonly used, and described extra material is silicon ash.
Embodiment 4
A kind of steel fiber thermal insulation concrete, comprises the raw material of following weight distribution ratio: steel fiber 2 parts, glass bead 50 parts, cement 480 parts, 1350 parts, stone, 600 parts, sand, 180 parts, water, admixture 8 parts, extra material 100 parts;
Prepare in accordance with the following steps: first the water of the glass bead of described ratio and 1/3 is dropped in stirrer; mix is after 20 seconds; add the extra material of described ratio again; stir full and uniform after; finally the cement of described ratio, stone, sand, steel fiber, admixture and residue water are evenly dropped in stirrer, stir and namely obtain steel fiber thermal insulation concrete in 4.5 minutes.
Embodiment 5
A kind of steel fiber thermal insulation concrete, comprises the raw material of following weight distribution ratio: steel fiber 50 parts, glass bead 100 parts, cement 450 parts, 1300 parts, stone, 450 parts, sand, 300 parts, water, admixture 2 parts, extra material 70 parts;
Prepare in accordance with the following steps: first the water of the glass bead of described ratio and 1/3 is dropped in stirrer; mix is after 40 seconds; add the extra material of described ratio again; stir full and uniform after; finally the cement of described ratio, stone, sand, steel fiber, admixture and residue water are evenly dropped in stirrer, stir and namely obtain steel fiber thermal insulation concrete in 3 minutes.
During concrete enforcement, the particle diameter of described glass bead is 0.1-2mm, and thermal conductivity is 0.03-0.05W/mK, water-intake rate < 40%, melt temperature 1200 DEG C; Described admixture is the high-performance polycarboxylic acids water reducing agent that this area is commonly used, and described extra material is flyash.
Embodiment 6
A kind of steel fiber thermal insulation concrete, comprises the raw material of following weight distribution ratio: steel fiber 25 parts, glass bead 70 parts, cement 360 parts, 1100 parts, stone, 520 parts, sand, 150 parts, water, admixture 10 parts, extra material 85 parts;
Prepare in accordance with the following steps: first the water of the glass bead of described ratio and 1/3 is dropped in stirrer; mix is after 50 seconds; add the extra material of described ratio again; stir full and uniform after; finally the cement of described ratio, stone, sand, steel fiber, admixture and residue water are evenly dropped in stirrer, stir and namely obtain steel fiber thermal insulation concrete in 4 minutes.
The present invention can summarize with other the specific form without prejudice to spirit of the present invention or principal character.Therefore, no matter from which point, above-mentioned embodiment of the present invention all can only be thought explanation of the present invention and can not limit invention, claims indicate scope of the present invention, and scope of the present invention is not pointed out in above-mentioned explanation, therefore, any change in the implication suitable with claims of the present invention and scope, all should think to be included in the scope of claims.
Claims (3)
1. a steel fiber thermal insulation concrete, is characterized in that, is made up of the raw material of following parts by weight: steel fiber 2-50 part, glass bead 30-100 part, cement 300-500 part, stone 1100-1400 part, sand 450-600 part, water 150-300 part, admixture 0.2-10 part, extra material 50-100 part; The useful length of described steel fiber is 10-60mm, diameter or equivalent diameter >=0.08mm; The particle diameter of described glass bead is 0.1-2mm, and thermal conductivity is 0.03-0.05W/mK, water-intake rate < 40%, melt temperature 1200 DEG C.
2. steel fiber thermal insulation concrete according to claim 1, is characterized in that: it is 0.1-2% that described steel fiber accounts for concrete mass ratio, and it is 1-5% that glass bead accounts for concrete mass ratio.
3. the preparation method of a steel fiber thermal insulation concrete as claimed in claim 1; it is characterized in that comprising the steps: first the water of the glass bead of described ratio and 1/3 to be dropped in stirrer; after mix 20-50 second; add the extra material of described ratio again; stir full and uniform after; finally the cement of described ratio, stone, sand, steel fiber, admixture and residue water are evenly dropped in stirrer, stir and namely obtain steel fiber thermal insulation concrete in 3-5 minute.
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| CN104529301B (en) * | 2014-12-23 | 2016-06-29 | 太原理工大学 | Building heat preservation concrete containing nano-pearl rock and preparation method thereof |
| CN104692723A (en) * | 2015-02-12 | 2015-06-10 | 中国葛洲坝集团国际工程有限公司 | Large-deformation concrete |
| CN105060836B (en) * | 2015-08-21 | 2017-04-05 | 成都理工大学 | Heat-insulated lining concrete in High-geotemperature tunnel and preparation method thereof |
| CN106495576A (en) * | 2016-09-13 | 2017-03-15 | 广西大学 | A kind of intensity improved corrosion concrete and preparation method thereof |
| CN107098651A (en) * | 2017-06-03 | 2017-08-29 | 合肥雅克丽新型建材有限公司 | A kind of environmental-friendly construction material and preparation method thereof |
| CN113582620A (en) * | 2021-08-10 | 2021-11-02 | 西京学院 | Biomass ash concrete block containing steel fibers and manufacturing method thereof |
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