CN113582606A - Material for small prefabricated part of highway subgrade and preparation method thereof - Google Patents
Material for small prefabricated part of highway subgrade and preparation method thereof Download PDFInfo
- Publication number
- CN113582606A CN113582606A CN202110720085.0A CN202110720085A CN113582606A CN 113582606 A CN113582606 A CN 113582606A CN 202110720085 A CN202110720085 A CN 202110720085A CN 113582606 A CN113582606 A CN 113582606A
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- CN
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- Prior art keywords
- parts
- small prefabricated
- ceramsite
- small
- highway subgrade
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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
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—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
Abstract
The invention relates to the field of engineering materials, in particular to a material for a small prefabricated part of a highway subgrade and a preparation method thereof. The material is prepared by replacing part of broken stones with ceramsite in the original raw material formula of concrete. The small prefabricated part has moderate weight, and solves the problem that the small prefabricated part is inconvenient to install and build on site due to overweight; the concrete mixing proportion is reasonable in design, and the quality control of the small-volume concrete is easy; the lap joint of the prefabricated part has stronger shock resistance, and simultaneously, the anti-permeability performance of the structure is improved; based on the advantages, the small-sized component is convenient for industrial production and plays a positive promoting role in unifying national engineering standards.
Description
Technical Field
The invention relates to the field of engineering materials, in particular to a material for a small prefabricated part of a highway subgrade and a preparation method thereof.
Background
The small prefabricated parts of highway engineering are mainly divided into two categories of slope protection and drainage engineering. The production process is mature, and the prior art generally adopts a common c30 concrete precast block for construction. At the present stage, the small prefabricated component has a plurality of problems, such as great weight, component cracking, serious corner drop and the like due to early form removal in the production process.
Taking the Puyan Sanming section YA7 as an example, the problems existing at the present stage mainly include:
1. the small prefabricated parts are too heavy and inconvenient to install and build on site.
2. The small prefabricated parts are various and are not convenient for industrial production.
3. The design of the concrete mixing proportion is unreasonable, and the quality control of the concrete with small volume is not satisfied.
4. The lap joint between the prefabricated parts has poor anti-seismic performance, and if the construction is not standard, the lap joint is easy to generate cracks, so that the anti-permeability performance of the structure is reduced.
5. There is no nationwide uniform engineering standard; only Henan province publishes local technical regulations, and Fujian province has no guide document.
Disclosure of Invention
The invention aims to provide a material for a small prefabricated part of a highway subgrade and a preparation method thereof, which can solve the problem of heavy weight of the part without increasing the cost.
The invention is realized by the following steps:
the invention firstly provides a material for a small prefabricated part of a highway subgrade, which is prepared by replacing part of broken stones with ceramsite in the original raw material formula of concrete.
The content of the ceramsite is 1-10% of the mass of the crushed stone.
The raw material also comprises fibers and an air entraining agent.
The raw materials also comprise rubber powder.
The feed comprises the following raw materials in parts by weight:
1 part of fiber, namely 1 part of fiber,
the cement is 350-400 parts,
60-70 parts of fly ash,
700 portions of the sand and 800 portions of the sand,
900 portions of broken stone and 1000 portions of auxiliary material,
4-5 parts of an air-entraining agent,
3-4 parts of an early strength water reducing agent,
35-45 parts of ceramsite,
0.4 part of rubber powder, namely,
160 portions of water and 170 portions of water.
Further:
the macadam is aggregate with the aggregate diameter of 4.75-9.5mm and 9.5-19 mm.
The average grain diameter of the ceramsite is less than or equal to 10 mm.
The rubber powder comprises redispersible latex powder.
The fibers comprise polypropylene fibers.
Wherein the ceramsite is a hard, light round or oval particle, and the surface of the ceramsite is provided with a large number of grooves and grooves, so that the ceramsite can be well combined with cement mortar. Compared with common concrete of the same grade, the ceramsite concrete has the characteristics of light structure dead weight, structural improvement function and the like.
The polypropylene fiber is a macromolecular hydrocarbon, has surface hydrophobicity, cannot be soaked by cement paste, has very stable chemical property, and cannot generate any chemical action with cement, additives and admixtures in concrete, so the polypropylene fiber has good affinity with concrete materials.
The air entraining agent has the effects that a large amount of uniformly distributed, stable and closed micro bubbles are introduced in the concrete stirring process, so that the surface tension of concrete slurry is reduced, the pore structure of concrete can be effectively improved, and the bleeding segregation of a mortar concrete mixture is reduced. The introduction of fine and stable air bubbles can also improve the workability of the concrete.
The invention also provides a preparation method of the material, which comprises the following steps:
(1) mixing fiber, cement, fly ash, sand, broken stone, air entraining agent, ceramsite and rubber powder, dry-mixing for 5-8 minutes, and uniformly stirring to prepare a dry material A;
(2) and adding water and an early strength water reducing agent into the dry material A, and wet-stirring for 4-7 minutes to form a material B, namely a material for a small prefabricated part of the highway subgrade.
The invention has the following advantages: the small prefabricated part has moderate weight, and solves the problem that the small prefabricated part is inconvenient to install and build on site due to overweight; the concrete mixing proportion is reasonable in design, and the quality control of the small-volume concrete is easy; the lap joint of the prefabricated part has stronger shock resistance, and simultaneously, the anti-permeability performance of the structure is improved; based on the advantages, the small-sized component is convenient for industrial production and plays a positive promoting role in unifying national engineering standards.
Detailed Description
A material for a small prefabricated part of a highway subgrade comprises the following raw materials in parts by weight:
1 part of fiber, namely 1 part of fiber,
the cement is 350-400 parts,
60-70 parts of fly ash,
700 portions of the sand and 800 portions of the sand,
900 portions of broken stone and 1000 portions of auxiliary material,
4-5 parts of an air-entraining agent,
3-4 parts of an early strength water reducing agent,
35-45 parts of ceramsite,
0.4 part of rubber powder, namely,
160 portions of water and 170 portions of water.
The invention changes the mixing amount of ceramsite, fiber, air entraining agent and the like in sequence, takes the weight reduction as a main target, and selects the proportion which meets the lightest requirement of the weight under the condition of meeting the compressive and flexural strength of the prefabricated part. The method comprises the following specific steps:
(1) the ceramsite is added into the cement concrete, so that the quality of the cement concrete can be obviously reduced, and according to the performance change condition of the cement concrete, the optimal volume mixing amount of the ceramsite is preferably 20%, and the quality of the cement concrete is reduced by 7.8%. As the apparent density of the ceramsite is smaller, the ceramsite can replace part of coarse aggregate to achieve the purpose of reducing the weight of the prefabricated part, and 20 percent of the ceramsite is added in 1 volume of the gravel, and 20 percent of the ceramsite is replaced by the ceramsite. Namely, the weight content of the ceramsite is 4.2 percent of the mass of the broken stone.
For example: the apparent density of the ceramsite is 566kg/m3Apparent density of crushed stone 2657kg/m3
Density 2657 of 1000 parts crushed stone/crushed stone
The substituted volume V1 is 20 percent of V ceramsite mixing amount
The mass m of the substituted ceramsite is V1, and the ceramsite density is 566kg/m343 parts.
(2) The gelatine powder has obvious improvement effect on the workability of the cement concrete, the slump of the cement concrete is greatly improved after the gelatine powder is added, and through comprehensive comparison of performances, the optimum mass mixing amount of the gelatine powder is 0.4% (based on the total weight of the gelled material, wherein the mass of the gelled material is equal to the mass of cement and the mass of fly ash), and the mass of 20% of ceramsite and 0.4% of the gelatine powder cement concrete is reduced by 9.2% compared with that of a comparison sample.
(3) After the fibers are added, the 28d compressive strength of the cement concrete is increased from 32.4MPa to 33.3MPa, the compressive strength and the breaking strength of the cement concrete are in a descending trend along with the increase of the fiber content, and the optimal mass mixing amount of the fibers is determined to be 1 percent (according to 1m of the total performance analysis)31kg of fiber is added into the formed test piece), and the mass of 20 percent of ceramsite, 0.4 percent of rubber powder and 1 percent of fiber cement concrete is reduced by 12.2 percent compared with that of a comparative sample.
(4) After the air entraining agent is added, the influence on the air content of the concrete is large, so that a test piece generates certain bubbles during forming, the weight is reduced, the volume weight, the compressive strength, the bending strength, the cracking performance and the like of a light concrete small component are influenced, and on the premise of meeting engineering requirements, the optimal mass mixing amount ratio is selected to be 1.2% (based on the total weight of the cementing material, wherein the cementing material is cement mass and fly ash mass).
Example 1
(1) 1 part of polypropylene fiber, 350 parts of ordinary portland cement, 60 parts of fly ash, 700 parts of river sand, 900 parts of broken stone, 4 parts of air entraining agent, 40 parts of ceramsite and 0.4 part of redispersible latex powder are mixed, and are subjected to dry stirring for 6 minutes to prepare a dry material A after uniform stirring;
(2) 160 parts of water and 4 parts of early strength water reducing agent are added into the dry material A, and the mixture is wet-mixed for 5 minutes to form a material B, namely the material for the highway subgrade small prefabricated part, wherein the performance parameters are shown in Table 1.
TABLE 1 highway subgrade small prefabricated component Performance test
Note: the control group was not added with fiber, ceramsite and air entraining agent.
Although specific embodiments of the invention have been described above, it will be understood by those skilled in the art that the specific embodiments described are illustrative only and are not limiting upon the scope of the invention, and that equivalent modifications and variations can be made by those skilled in the art without departing from the spirit of the invention, which is to be limited only by the appended claims.
Claims (10)
1. A material for small prefabricated parts of highway subgrade is characterized in that: in the original concrete raw material formula, part of the broken stones are replaced by ceramsite.
2. The material for highway subgrade small prefabricated elements according to claim 1, characterized in that: the content of the ceramsite is 1-10% of the mass of the crushed stone.
3. The material for highway subgrade small prefabricated elements according to claim 1, characterized in that: the raw materials also comprise fibers and an air entraining agent.
4. The material for highway subgrade small prefabricated elements according to claim 1, characterized in that: the raw materials also comprise rubber powder.
5. The material for highway subgrade small prefabricated elements according to claim 1, characterized in that: the feed comprises the following raw materials in parts by weight:
1 part of fiber, namely 1 part of fiber,
the cement is 350-400 parts,
60-70 parts of fly ash,
700 portions of the sand and 800 portions of the sand,
900 portions of broken stone and 1000 portions of auxiliary material,
4-5 parts of an air-entraining agent,
3-4 parts of an early strength water reducing agent,
35-45 parts of ceramsite,
0.4 part of rubber powder, namely,
160 portions of water and 170 portions of water.
6. A material for small prefabricated parts for road bed according to claim 5, characterized in that: the macadam is aggregate with the aggregate diameter of 4.75-9.5mm and 9.5-19 mm.
7. A material for small prefabricated parts for road bed according to claim 5, characterized in that: the average grain diameter of the ceramsite is less than or equal to 10 mm.
8. A material for small prefabricated parts for road bed according to claim 5, characterized in that: the rubber powder comprises redispersible latex powder.
9. A material for small prefabricated parts for road bed according to claim 5, characterized in that: the fibers comprise polypropylene fibers.
10. A method of preparing a material according to any one of claims 5 to 9, wherein: the method comprises the following steps:
(1) mixing fiber, cement, fly ash, sand, broken stone, air entraining agent, ceramsite and rubber powder, dry-mixing for 5-8 minutes, and uniformly stirring to prepare a dry material A;
(2) and adding water and an early strength water reducing agent into the dry material A, and wet-stirring for 4-7 minutes to form a material B, namely a material for a small prefabricated part of the highway subgrade.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110720085.0A CN113582606A (en) | 2021-06-28 | 2021-06-28 | Material for small prefabricated part of highway subgrade and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110720085.0A CN113582606A (en) | 2021-06-28 | 2021-06-28 | Material for small prefabricated part of highway subgrade and preparation method thereof |
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| CN113582606A true CN113582606A (en) | 2021-11-02 |
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| CN202110720085.0A Pending CN113582606A (en) | 2021-06-28 | 2021-06-28 | Material for small prefabricated part of highway subgrade and preparation method thereof |
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Citations (8)
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| CN103641415A (en) * | 2013-12-16 | 2014-03-19 | 中国人民解放军理工大学 | High-strength anti-cracking ceramsite concrete and preparation method thereof |
| CN104945007A (en) * | 2015-06-12 | 2015-09-30 | 中民筑友有限公司 | Precast aerated ceramsite concrete component and preparation method thereof |
| CN106242432A (en) * | 2016-08-18 | 2016-12-21 | 上海闵轩钢结构工程有限公司 | A kind of lighting low elastic modulus concrete and production technology thereof |
| CN108911781A (en) * | 2018-05-30 | 2018-11-30 | 江苏百瑞吉新材料有限公司 | A kind of decontamination pervious concrete and preparation method thereof |
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2021
- 2021-06-28 CN CN202110720085.0A patent/CN113582606A/en active Pending
Patent Citations (8)
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| CN106242432A (en) * | 2016-08-18 | 2016-12-21 | 上海闵轩钢结构工程有限公司 | A kind of lighting low elastic modulus concrete and production technology thereof |
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| CN110590289A (en) * | 2019-10-14 | 2019-12-20 | 广州珠江黄埔大桥建设有限公司 | Basalt fiber reinforced recycled concrete |
| WO2021109984A1 (en) * | 2019-12-02 | 2021-06-10 | 哈尔滨工程大学 | Concrete oyster attachment base and preparation method therefor, and marine ecological engineering construction method |
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Inventor after: Chen Libiao Inventor after: Zhou Pinting Inventor after: Yang Feng Inventor after: Xue Yiqing Inventor after: Zhang Jie Inventor before: Zhou Pinting Inventor before: Yang Feng Inventor before: Xue Yiqing Inventor before: Zhang Jie |
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Effective date of registration: 20220308 Address after: 350000 21st floor, traffic complex building, No. 18, Dongshui Road, Donghu community, Wenquan street, Gulou District, Fuzhou City, Fujian Province Applicant after: Fujian Expressway science and Technology Innovation Research Institute Co.,Ltd. Applicant after: FUJIAN GONGDA GEOTECHNICAL ENGINEERING RESEARCH INSTITUTE CO.,LTD. Address before: 350000 Fujian Institute of Technology (Pudong Campus), 71 Qianyu East Road, Jin'an District, Fuzhou City, Fujian Province Applicant before: FUJIAN GONGDA GEOTECHNICAL ENGINEERING RESEARCH INSTITUTE CO.,LTD. |
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