Ultra-high performance cement-based H-shaped section bar

An ultra-high-performance, cement-based technology, applied in basic structural engineering, structural elements, sheet pile walls, etc., can solve problems that have not yet appeared, poor construction convenience, and high brittleness.

Inactive Publication Date: 2016-03-09
浙江宏日泰耐克新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Due to the low strength and high brittleness of ordinary concrete, the structural members made of it have large cross-sections and poor construction convenience, so there has not yet been a lightweight and convenient assembled profile member similar to steel structural profiles.

Method used

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  • Ultra-high performance cement-based H-shaped section bar
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  • Ultra-high performance cement-based H-shaped section bar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] Ultra-high performance cement-based H-shaped profiles, of which:

[0082] H=400mm, B=200mm, t 1 = 30mm, t 2 =30mm, R 1 =20mm, R 2 =3mm, R 3 = 0mm;

[0083] Ultra-high-performance cement-based composite material, including cementitious material, water and water reducer, the volume of cement accounts for 20%, the cement is P·I cement with a strength grade of 52.5, and the mineral admixture is silica fume and powder Coal ash, accounting for 54%.

[0084] The ratio fraction of cement, silica fume and fly ash is numerically analyzed and calculated through the ideal accumulation curve and its particle size cumulative distribution curve;

[0085] 1) the ideal stacking curve formula is:

[0086] P sd =A+(100-A)·(d / D max ) π / 2e ;

[0087] Among them, P sd is the percentage of particles passing through the sieve, A is an empirical constant, d is the diameter of the sieve, D max is the maximum particle size of the particle;

[0088] The value of the empirical constan...

Embodiment 2

[0110] Ultra-high performance cement-based H-shaped profiles, of which:

[0111] H=400mm, B=400mm, t 1 =50mm,t 2 =50mm, R 1 =25mm, R 2 =5mm, R 3 = 5mm;

[0112] Ultra-high performance cement-based composite material, including cementitious material, water and water reducer, the volume of cement accounts for 49%, the cement is P·I cement with a strength grade of 62.5, and the mineral admixture is silica fume, powder Coal ash and slag powder account for 18% by volume; the proportions of each component of the cementitious material are calculated in Example 1 to obtain X c =0.731, X sf =0.104, X fa = 0.094 and X bs = 0.070. The water-binder ratio W / B=0.143, the admixture is polycarboxylate superplasticizer solution, and the dosage is 2.3% of the mass of the gelling material.

[0113] The volume percentage of the main materials used in ultra-high performance cement-based composites is as follows:

[0114]

[0115] The dosage and quality ratio of each material of ultra...

Embodiment 3

[0123] Ultra-high performance cement-based H-shaped profiles, of which:

[0124] H=400mm, B=200mm, t 1 = 30mm, t 2 =30mm, R 1 =20mm, R 2 =3mm, R 3 = 0mm;

[0125] Ultra-high-performance cement-based composite material, including cementitious material, fine aggregate, steel fiber, water and water reducer, the volume of cement accounts for 26.5%, the cement is P·II cement with a strength grade of 52.5, and the mineral mixed The composite materials are silica fume, fly ash and mineral powder, accounting for 15.8%. Each component distribution fraction of gelling material is by the calculation mode of embodiment 1, gets X c =0.626, X sf =0.161, X fa = 0.102 and X bs = 0.111. The fine aggregate is natural sand with a fineness modulus of 1.4, and its volume is 0.811 of that of the cementitious material. The steel fibers are copper-plated steel fibers with a diameter of 0.2mm and a length of 13mm, and the volume content is 1.5%. The water-binder ratio W / B=0.162, the admixt...

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Abstract

The invention relates to an ultra-high performance cement-based H-shaped section bar which is formed by pouring an ultra-high performance cement-based composite material. The cement-based H-shaped section bar meet requirements as follows: H / B is equal to 0.8-3; t1 / B is equal to 0.03-0.2; t2 / H is equal to 0.03-0.2; R1 / B is equal to 0.05-0.5; R2 / t2 is equal to 0.1-0.5; and R3 / R2 is smaller than or equal to 1. According to the ultra-high performance cement-based composite material, the grain composition of a multi-component cementitious material and the grain composition of an aggregate are optimized, and by means of chemical additives, on the premise that concrete has excellent fluidity, the compressive strength reaches more than 170 MPa under the 28 d standard. Through technologies of fibers, reinforcing bars and the like, the cement-based section bar obtains performance of a material component similar to section steel and is applied to structures such as beams, columns, piles and the like of a fabricated building, so that the building has portability and construction speed which are similar to the portability and the construction speed of a steel structure but corrosion resistance and fire resistance which are higher than the corrosion resistance and the fire resistance of a steel-structure section bar.

Description

technical field [0001] The invention relates to a prefabricated cement-based H-shaped profile, more specifically, relates to an ultra-high-performance cement-based H-shaped profile poured from an ultra-high-performance cement-based composite material. Background technique [0002] Due to the low strength and high brittleness of ordinary concrete, the structural members made of it have large cross-sections and poor construction convenience. Therefore, light and convenient assembled profile members similar to steel structural profiles have not yet appeared. The emergence of ultra-high performance cement-based composite materials has made it possible to assemble cement-based profiles. Ultra-high-performance cement-based composite materials use fiber-reinforced reinforcement and other technologies to enable ultra-high-performance cement-based profiles to obtain material component properties similar to steel sections, and are applied to beams, columns, piles and other structures ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E04C3/00E04C3/20E04C3/26E04C3/34E02D5/30
Inventor 施慧聪刘国平赵正王俊颜刘健姚欣
Owner 浙江宏日泰耐克新材料科技有限公司
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