CN106866177B - Fiber foam concrete and preparation method thereof - Google Patents
Fiber foam concrete and preparation method thereof Download PDFInfo
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- CN106866177B CN106866177B CN201710123429.3A CN201710123429A CN106866177B CN 106866177 B CN106866177 B CN 106866177B CN 201710123429 A CN201710123429 A CN 201710123429A CN 106866177 B CN106866177 B CN 106866177B
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- 239000000835 fiber Substances 0.000 title claims abstract description 51
- 239000011381 foam concrete Substances 0.000 title claims abstract description 42
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 239000000203 mixture Substances 0.000 claims abstract description 22
- 239000010881 fly ash Substances 0.000 claims abstract description 20
- 239000004568 cement Substances 0.000 claims abstract description 17
- 239000006260 foam Substances 0.000 claims abstract description 15
- 238000005187 foaming Methods 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000003756 stirring Methods 0.000 claims abstract description 9
- 239000010687 lubricating oil Substances 0.000 claims abstract description 8
- 238000005303 weighing Methods 0.000 claims abstract description 6
- 238000001514 detection method Methods 0.000 claims abstract description 5
- 239000007788 liquid Substances 0.000 claims abstract description 5
- 239000002994 raw material Substances 0.000 claims abstract description 4
- 239000004088 foaming agent Substances 0.000 claims description 11
- 239000011398 Portland cement Substances 0.000 claims description 3
- 230000015271 coagulation Effects 0.000 claims description 2
- 238000005345 coagulation Methods 0.000 claims description 2
- 238000007865 diluting Methods 0.000 claims description 2
- 239000011521 glass Substances 0.000 claims description 2
- 238000004321 preservation Methods 0.000 abstract description 16
- 238000009413 insulation Methods 0.000 abstract description 9
- 238000005728 strengthening Methods 0.000 abstract description 3
- 238000005452 bending Methods 0.000 abstract description 2
- 230000006835 compression Effects 0.000 abstract description 2
- 238000007906 compression Methods 0.000 abstract description 2
- 239000003365 glass fiber Substances 0.000 description 11
- 238000000034 method Methods 0.000 description 7
- 239000004743 Polypropylene Substances 0.000 description 5
- -1 polypropylene Polymers 0.000 description 5
- 229920001155 polypropylene Polymers 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 229920002748 Basalt fiber Polymers 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
Classifications
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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
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/10—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by using foaming agents or by using mechanical means, e.g. adding preformed foam
-
- 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
-
- 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
- C04B2111/40—Porous or lightweight materials
-
- 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
- C04B2111/52—Sound-insulating materials
-
- 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
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses fiber foam concrete and a preparation method thereof, wherein the fiber foam concrete comprises the following raw materials in parts by weight: cement: water: foaming liquid: the fly ash comprises the following fibers: 5290:4965:1.361: 2964:10. During preparation, the components are weighed according to the proportion; sequentially adding cement and fly ash into a stirrer, weighing water according to a proportion, uniformly stirring the mixture by the stirrer, and adding fibers; then preparing and adding foaming liquid; then, the foam is gradually added into the mixture and is continuously stirred until the mixture is uniformly mixed; finally, pouring the mixture into a die brushed with lubricating oil, and placing the die brushed with the lubricating oil into a curing room for curing; removing the mold after 24 hours; and respectively curing for 3d, 7d and 28d for experimental detection. The invention has good functions of heat preservation, heat insulation, compression resistance and bending resistance, and can be applied to a railway roadbed heat preservation strengthening layer.
Description
Technical Field
The invention relates to foam concrete, in particular to fiber foam concrete and a preparation method of the fiber foam concrete. The foam concrete can be widely applied to railway roadbed heat preservation strengthening layers and cold area engineering heat preservation layers in seasonal frozen soil areas.
Background
The foam concrete has the advantages of light weight, heat preservation, fire resistance, shock absorption, environmental protection, sound insulation and the like, has less investment, is convenient to produce and construct, can use a large amount of industrial waste residues, receives high attention at home and abroad, and is widely applied and deeply researched.
With the development of railway industry, the engineering problem of railways has attracted more attention. When a railway is built, more attention is paid to energy conservation and environmental protection. The more outstanding is the stability problem of permafrost road bed, and in order to ensure road bed's stability, the protection permafrost room is the most commonly accepted design principle, and what adopted at present is polystyrene (EPS) heated board and Polyurethane (PU) heated board, but the durability of two kinds of heated boards above is than relatively poor, and compressive strength is lower. In recent years, the application of the foam concrete in building heat preservation, gardens, runways, playgrounds, retaining walls and the like shows that the foam concrete has strong practicability and is very suitable for popularization.
Disclosure of Invention
The invention aims to provide fiber foam concrete which has good functions of heat preservation, heat insulation, compression resistance and bending resistance and can be applied to a railway roadbed heat preservation strengthening layer.
The invention also provides a preparation method of the fiber foam concrete, and the fiber foam concrete produced by the preparation method can realize heat preservation and heat insulation, and effectively improve the compressive strength and the flexural strength.
In order to solve the technical problems, the invention adopts the following technical scheme:
the key technology of the fiber foam concrete is as follows: the fiber foam coagulation comprises the following raw materials in parts by weight:
cement: water: foaming liquid: the fly ash comprises the following fibers: 5290:4965:1.361: 2964:10. Preferably, the cement is Portland cement with the strength grade of 52.5.
Preferably, the fly ash is class I fly ash.
Preferably, the fiber is modified glass monofilament fiber.
Preferably, the fibers have a length of 12mm and a diameter of 9 μm.
Preferably, the foaming agent is a surface active polymer foaming agent, the dilution ratio is 60, and the foaming ratio is 20.
The preparation method of the fiber foam concrete comprises the following steps:
1. weighing the components according to the proportion;
2. sequentially adding cement and fly ash into a stirrer, weighing water according to a proportion, uniformly stirring the mixture by the stirrer, and adding fibers;
3. closing an air outlet valve of the foaming machine while stirring by the stirrer; uniformly diluting a foaming agent and water according to the weight ratio of 1:60, and adding the diluted foaming agent and water into a foaming machine by using a funnel; after the addition is finished, an air compressor is started, and when the air pressure reaches 0.8MPa, an air outlet valve can be opened for foaming; at this time, the foam was weighed using a 1000mL measuring cylinder until the foam density reached 50kg/m3The standard is met;
4. gradually adding the foam into the mixture, and continuously stirring until the foam is uniformly mixed;
5. pouring the mixture into a die brushed with lubricating oil, and placing the die brushed with the lubricating oil into a standard curing room for curing; removing the mold after 24 hours; and respectively curing for 3d, 7d and 28d for experimental detection.
The technical effect produced by adopting the technical scheme is as follows:
1. in the raw materials of the invention, the fly ash has the characteristic of increasing fluidity, and can effectively improve the mixing degree of the mixture in the process of preparing the fiber foam concrete. Compared with other mass ratios of the fly ash (mass ratio of cement to fly ash: 10:0,8:2,7:3,6:4,5:5, 4: 6), the fly ash in the mixture ratio can obviously improve the compressive strength and the flexural strength of the fiber foam concrete. And the foam concrete is prepared according to the amount of the foaming agent in the proportion, and the prepared sample has good performances of heat conductivity coefficient, durability, water absorption and the like.
2. In the invention, monofilament fiber with the length of the modified glass fiber being 12mm and the diameter being 9 mu m is added. In the experimental process, different types of fibers (glass fibers, polypropylene fibers and basalt fibers) are compared with foam concrete samples with different lengths (6mm, 9mm, 12mm and 15mm) and different contents (accounting for 0.05%, 0.10%, 0.15% and 0.20% of the mass of the mixture), and through tests, the performance of the fiber foam concrete doped with glass fibers ranging from-12 mm to 0.1% is the best. The analysis reason is as follows: the glass fiber can increase the crack resistance of the sample, improve the integrity of the foam concrete and improve the performance of the foam concrete.
3. The fiber foam concrete produced by the method has the functions of light weight, pressure resistance, crack resistance, water resistance and heat preservation. The prefabricated plates can be prefabricated in factories, and transported to the site for assembly after being maintained; and can also be poured in the construction site.
4. In the experimental process, the foam prepared by an air compressor at 0.8MPa can meet the requirement of a foaming agent, and the density requirement is 50kg/m3The effect of mixing the mixture into the mixture is good, and the durability, compressive strength, flexural strength, heat conductivity coefficient and the like of the prepared fiber foam concrete sample are obviously improved compared with other mixture ratios; and the fiber foam concrete sample has uniform pores, has good heat preservation and heat insulation performance, and can obviously improve the heat preservation of the railway roadbed.
Detailed Description
The present invention will be further described with reference to the following specific examples.
The invention starts from the durability of a railway roadbed heat insulation material, combines foam concrete with wide application in the aspect of building external wall heat insulation, comprehensively considers the problems of durability, compressive strength and the like, and aims to design fiber foam concrete with the most optimized performance. The foam concrete which is widely applied to the aspect of building heat insulation is applied to railway heat insulation, and is very significant for railway construction and railway performance improvement. The fiber enhances the compressive strength and the flexural strength of the foam concrete, and simultaneously improves the porosity of the foam concrete, namely reduces the heat conductivity coefficient, so that the thermal insulation performance of the foam concrete is greatly improved compared with the foam concrete. After single factor experiments and freeze-thaw cycle tests, the fiber foam concrete with the optimal performance is used for railway heat preservation, and is subjected to factory prefabrication production, so that the construction efficiency is improved, and the durability problem of heat preservation materials in railway engineering is solved.
In the experimental process, firstly, determining which fibers are adopted by experiments, preparing foam concrete samples of different types of fibers (glass fibers, polypropylene fibers and basalt fibers), different lengths (6mm, 9mm, 12mm and 15mm) and different contents (0.05%, 0.10%, 0.15% and 0.20% of the total mass of the mixture) for detection, wherein the following data show that the foam concrete prepared by the method has the advantages that the compressive strength is more than 11MPa, the flexural strength is more than 4MPa and the thermal conductivity is less than 0.3W/(m.K) (the performance index is higher than the relevant performance requirements of the industry and accords with the industrial use regulations), and the foam concrete prepared by the glass fibers with the mass percentage content of 0.1% and the length of 12mm has the optimal performance; the properties of the fibers with different lengths and different types are shown in tables 1, 2 and 3.
TABLE 1 Polypropylene fiber different Length and different types of Properties
TABLE 2 different lengths and different kinds of properties of glass fibers
TABLE 3 basalt fiber different length and different kind of properties
In the above test, the glass fiber: modified glass fiber produced by starlight glass fiber factories in salt cities is adopted (of course, similar products produced by other factories can also be adopted).
Basalt fiber: the method adopts Jiangsu Kandaff New Material science and technology company (of course, similar products produced by other manufacturers can also be adopted).
Polypropylene fiber: modified polypropylene fibers produced by Shanghai Bangwei municipal engineering Co., Ltd are adopted (of course, similar products produced by other manufacturers can be adopted).
Secondly, on the basis of determining the use of the glass fiber, different proportions of fly ash and different types of cement are added to determine the types and the contents of the fly ash and the cement, as shown in the following table 4.
TABLE 4 Properties of different Cement types and different fly ash contents (by weight)
In the above test, cement: ordinary portland cement produced by hebei jingedingxin cement limited having strength grades of 52.5 and 42.5 was used.
Fly ash: grade I fly ash from a Zhou county power plant in North China (although similar products from other manufacturers can be used).
Tests show that the physical properties of the fiber foam concrete with the mixture ratio are measured by adopting cement with the cement strength grade of 52.5 preferably: the thermal conductivity coefficient is less than 0.25W/(m.K), and the water absorption is 23.7% (the index meets the use requirement due to the relevant requirements of the current industry). Through determination, the strength performance of the product produced by adopting the proportion is as follows: the 28d compressive strength reaches 14MPa, and the 28d flexural strength reaches 5.5 MPa; durability: the strength after 25 cycles was 10 MPa. The fiber foam concrete prepared according to the proportion is used for heat preservation of railway subgrade, and can effectively solve the problems of heat preservation and strength of the existing railway subgrade.
The foaming agent in the embodiment is a surface active polymer foaming agent produced by Guangdong China civil engineering technology Co.
During the preparation, the components are weighed according to the mixture ratio.
Then sequentially adding cement and fly ash into a stirrer, weighing water according to the mass ratio, and adding fibers after uniformly stirring the mixture by the stirrer. And closing an air outlet valve of the foaming machine while stirring by the stirrer. The foaming agent is diluted uniformly according to the proportion of 1:60 and then added into a foaming machine by a funnel. After the addition is finished, the air compressor is opened, and when the air pressure reaches 0.8MPa, the air outlet valve can be opened for foaming. At this time, the foam was weighed using a 1000mL measuring cylinder until the foam density reached 50kg/m3The standard is met. The foam is gradually added to the mixture and stirred continuously until mixed uniformly. Pouring the mixture into a die brushed with lubricating oil, and placing the die brushed with the lubricating oil into a curing room for curing; and the mould is removed after 24 hours. And curing for 3d, 7d and 28d respectively for experimental detection.
Claims (2)
1. A fiber foam concrete is characterized in that: the fiber foam coagulation is composed of the following raw materials in parts by weight:
cement: water: foaming liquid: fly ash: the fiber is as follows: 5290:4965:1.361:2964: 10;
the fiber is modified glass monofilament fiber; the length of the fiber is 12mm, and the diameter of the fiber is 9 μm; the cement is Portland cement with the strength grade of 52.5;
the preparation method of the fiber foam concrete comprises the following steps:
1) weighing the components according to the proportion;
2) sequentially adding cement and fly ash into a stirrer, weighing water according to a proportion, uniformly stirring the mixture by the stirrer, and adding fibers;
3) preparation and addition of foaming liquid: closing an air outlet valve of the foaming machine while stirring by the stirrer; uniformly diluting a foaming agent and water according to the weight ratio of 1:60, and adding the diluted foaming agent and water into a foaming machine by using a funnel; after the addition is finished, an air compressor is started, and when the air pressure reaches 0.8MPa, an air outlet valve can be opened for foaming; at this time, the foam was weighed using a 1000mL measuring cylinder until the foam density reached 50kg/m3The standard is met;
4) gradually adding the foam into the mixture, and continuously stirring until the foam is uniformly mixed;
5) pouring the mixture into a die brushed with lubricating oil, and placing the die brushed with the lubricating oil into a curing room for curing; removing the mold after 24 hours; and curing for 3d, 7d and 28d respectively for experimental detection.
2. The fiber foam concrete according to claim 1, wherein the fly ash is class i fly ash.
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| CN201710123429.3A CN106866177B (en) | 2017-03-03 | 2017-03-03 | Fiber foam concrete and preparation method thereof |
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| CN201710123429.3A CN106866177B (en) | 2017-03-03 | 2017-03-03 | Fiber foam concrete and preparation method thereof |
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| CN106866177B true CN106866177B (en) | 2020-02-14 |
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| CN108484026A (en) * | 2018-03-19 | 2018-09-04 | 西南交通大学 | Lightweight concrete slurries and preparation method thereof |
| CN108373340A (en) * | 2018-05-03 | 2018-08-07 | 合肥宸翊商贸有限公司 | A kind of preparation method of the compound precast concrete wall of sound-insulating |
| CN109231943A (en) * | 2018-09-13 | 2019-01-18 | 怀宁建国混凝土制品有限责任公司 | A kind of high tenacity foamed cement and preparation method thereof |
| CN114477903A (en) * | 2022-02-10 | 2022-05-13 | 杭州鼎昇建材有限公司 | Urban rail vibration isolation lightweight concrete and preparation method thereof |
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| CN102603353A (en) * | 2012-03-16 | 2012-07-25 | 南京信息工程大学 | Foaming agent for foam concrete, and preparation method and application of foaming agent |
| CN203034669U (en) * | 2012-11-02 | 2013-07-03 | 李洪浩 | Waste residue concrete cored block |
| CN103553506A (en) * | 2013-09-25 | 2014-02-05 | 沈阳建筑大学 | Method for preparing fiber-enhanced foam concrete |
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| US6721684B1 (en) * | 2001-04-26 | 2004-04-13 | Nasser Saebi | Method of manufacturing and analyzing a composite building |
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|---|---|---|---|---|
| CN102603353A (en) * | 2012-03-16 | 2012-07-25 | 南京信息工程大学 | Foaming agent for foam concrete, and preparation method and application of foaming agent |
| CN203034669U (en) * | 2012-11-02 | 2013-07-03 | 李洪浩 | Waste residue concrete cored block |
| CN103553506A (en) * | 2013-09-25 | 2014-02-05 | 沈阳建筑大学 | Method for preparing fiber-enhanced foam concrete |
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| 浅谈玻璃纤维增强混凝土的性能和工程应用;李云洲;《山西建筑》;20090930;第35卷(第27期);第175-176页 * |
| 纤维对泡沫混凝土性能的影响;王朝强等;《西南科技大学学报》;20130930;第28卷(第3期);第12页左栏第1,3,5段，右栏第1,3段，表1-2 * |
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