C55 polypropylene fiber concrete, applications thereof, and preparation method of U-shaped beam

A polypropylene fiber and concrete technology, applied in the field of concrete, can solve problems such as structural bearing capacity, cracks and adverse effects on durability, insufficient compressive strength of concrete, and prestress that cannot meet construction requirements

Inactive Publication Date: 2018-11-30
山东中建西部建设有限公司
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Problems solved by technology

[0003] However, in the process of existing urban rail transit construction, there is a problem that the short-term compressive strength of concrete is not enough, which will have adverse effects on the bearing capacity, cracks and durability of the structure, and the prestress in the later stage cannot meet the construction requirements.

Method used

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  • C55 polypropylene fiber concrete, applications thereof, and preparation method of U-shaped beam
  • C55 polypropylene fiber concrete, applications thereof, and preparation method of U-shaped beam
  • C55 polypropylene fiber concrete, applications thereof, and preparation method of U-shaped beam

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preparation example Construction

[0038] The present invention also provides a method for preparing a U-shaped beam, which adopts the C55 polypropylene fiber concrete described in the above technical scheme, and includes the following steps:

[0039] Pouring the C55 polypropylene fiber concrete into the steel formwork of the U-shaped beam to obtain a U-shaped beam preform;

[0040] The U-shaped beam preform is subjected to steam curing and natural curing in sequence to obtain a U-shaped beam.

[0041] In the present invention, the C55 polypropylene fiber concrete is poured into the steel formwork of the U-shaped beam to obtain a U-shaped beam preform.

[0042] figure 1 It is a schematic diagram of the structure of the U-shaped beam of the present invention. The web thickness of the U-shaped beam is preferably 400 mm, the width is preferably 4520 mm, and the beam wall thickness is preferably 301 mm.

[0043] In the present invention, the steel formwork has sufficient strength and rigidity to meet the requirements of cons...

Embodiment 1

[0061] Each cubic meter of C55 polypropylene fiber concrete contains: cement (P.O52.5 cement from Qingdao Branch of Shandong Shanshui Cement Group Co., Ltd., the fineness of cement is 350m 3 / kg, 3d compressive strength of 32.5MPa, 28d compressive strength of 56.8MPa) 408kg, C55 polypropylene fiber (12mm, Tai'an Yuanshun Building Materials Co., Ltd.) 0.9kg, mineral powder (Qingdao Zhongkuang Hongyuan Industry and Trade Co., Ltd.) Co., Ltd.’s commercially available S95 ore powder, 7d activity is 78%, 28d activity is 102%) 46kg, fly ash (Class F class I fly ash marketed by Huadian Laizhou Power Generation Co., Ltd.) 56kg, coarse aggregate ( The crushed stones have two sizes of 5-10mm and 10-20mm. The crushed values ​​of 5-10mm and 10-20mm crushed stones are 5.8 and 5.3, respectively, and the mud content is 0.7% and 0.6%, respectively. The mud content is 0.2% and 0.3%, respectively. Mo Daxin Crushing Site, the proportion of the gravel with a particle size of 5-10mm and 10-20mm is 2...

Embodiment 2

[0073] Same as Example 1, except that the mass ratio of cement, mineral powder, fly ash, fine aggregate, coarse aggregate and polycarboxylic acid water reducing agent in C55 polypropylene fiber concrete is 1:0.16:0.20:1.55: 2.4:0.017, the water-cement ratio is 0.22, the parameter of C55 polypropylene fiber is 0.9kg / m 3 .

[0074] The performance of the C55 polypropylene fiber concrete prepared in Example 2 was tested. The expansion degree of the C55 polypropylene fiber concrete was 510 mm, and other properties were similar to those in Example 1.

[0075] Take the C55 polypropylene fiber concrete of Example 2 to prepare U-shaped beams. The preparation method is the same as that of Example 1. The difference is that steam curing includes static stop (room temperature, 12h), heating (rate 15℃ / h, when the outdoor average When the temperature is lower than 10℃, the initial heating rate of heating is 5℃ / h), constant temperature (50℃, 21h) and cooling (rate 25℃ / h), the performance test of ...

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Abstract

The invention provides C55 polypropylene fiber concrete, and belongs to the field of concrete. The expansion degree of the C55 polypropylene fiber concrete reaches 550mm; the compressive strength in 3d, 7d, and 28d is 49.1, 56.7, and 72.4MPa; and the elastic modulus is 4.35MPa. Under the action of a designed load, the deflection test value of a U-shaped beam prepared from the C55 polypropylene fiber concrete ranges from 0.51 to 0.78; the deflection extreme value is lower than L / 600; the strain calibration factor is lower than 1; the linear relationship with test load is excellent; after unloading, structure test surface deformation recovery is excellent, and residual deformation is small; the strain of the U-shaped beam generated in a load loading direction is capable of satisfying requirements in <test method of long span concrete bridges> and <specification for inspection and evaluation of load-bearing capacity of highway bridges >; beam body elastic working performance is excellent,and the value is higher at a certain degree.

Description

Technical field [0001] The invention relates to the technical field of concrete, in particular to a C55 polypropylene fiber concrete and its application, and a preparation method of a U-shaped beam. Background technique [0002] The continuous development of the economy has driven the rapid development of the construction industry. As one of the most used building materials in modern construction projects, the demand for concrete in all types of construction is increasing by leaps and bounds. [0003] However, in the existing urban rail transit construction process, there is a problem that the compressive strength of concrete is insufficient in the short term, which adversely affects the load-bearing capacity, cracks, and durability of the structure, and the later prestress cannot meet the construction requirements. Summary of the invention [0004] In view of this, the purpose of the present invention is to provide a C55 polypropylene fiber concrete and its application, and a prepa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/50C04B16/0633C04B18/12C04B18/08C04B14/068C04B24/24
Inventor 刘文燕王军刘军孟玉冰王振林王延增解玉坚
Owner 山东中建西部建设有限公司
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