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Functional gradient self-healing high-strength concrete pipe pile and preparation method thereof

A technology of high-strength concrete and functional gradient, applied in the direction of sheet pile walls, reinforced molding, manufacturing tools, etc., can solve the problems of high cost, limit the multi-directional application of materials, etc., achieve the effect of improving utilization rate, making up for easy cracking, and protecting the environment

Active Publication Date: 2022-04-08
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its high cost limits the multi-faceted application of this material

Method used

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  • Functional gradient self-healing high-strength concrete pipe pile and preparation method thereof
  • Functional gradient self-healing high-strength concrete pipe pile and preparation method thereof
  • Functional gradient self-healing high-strength concrete pipe pile and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Raw materials: P.O 42.5 ordinary Portland cement, 5000 mesh Class I fly ash, 1000 mesh S95 slag powder, 100 mesh quartz sand, PVA fiber with a length of 12 mm and a diameter of 40 μm, a superelastic SMA fiber with a length of 16 mm and a diameter of 600 μm, tap water And polycarboxylate superplasticizer with a water reducing rate of up to 38%. Among them, in terms of mass percentage, cement: fly ash: mineral powder: sand: water = 0.45: 0.4: 0.15: 0.4: 0.25; the base is the total volume of cement, fly ash, mineral powder, sand and water mixed uniformly , the volume dosage of PVA fiber is 1.7%, the volume dosage of SMA fiber is 1%, and the dosage of polycarboxylate superplasticizer is 0.002 of the mass of gelling material.

[0041] The superelastic SMA fiber needs to be heat treated to improve the superelastic performance of the shape memory alloy: put the SMA fiber in a high-temperature furnace at 550° C. for about 15 minutes, and then take it out for water cooling.

[...

experiment example

[0054] When pipe piles are in service, they will be subjected to tension, compression, bending and even impact loads, resulting in cracking of components, providing a shortcut for the entry of corrosive media, causing corrosion of steel bars, and reducing the durability of pipe piles. Therefore, in this experimental example, the mechanical performance, impermeability performance and self-healing performance of the main functional part of the pipe pile obtained in Example 1—the self-healing concrete section—were tested under different working conditions.

[0055] Take the material that exerts the anti-cracking and self-healing effect in Example 1 and compare it with the pipe pile material in Comparative Example 1. Take concrete of two different materials on the pipe pile concrete production line respectively, and use a 100mm cube test mold with a thickness of 50mm The curved dog bone test mold, the prism test mold with a size of 100mm×100mm×400mm, and the hollow cylinder test mo...

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Abstract

The invention discloses a functional gradient self-healing high-strength concrete pipe pile and a preparation method thereof. The preparation method comprises the following steps: preparing ECC and self-healing concrete, stirring the ECC and the self-healing concrete, manufacturing a reinforcement cage, performing functional gradient segmented feeding and mold closing, performing centrifugal forming, removing the mold and curing. Active admixtures (coal ash, mineral powder and the like) and high-performance water reducing agents are doped into ECC and self-healing concrete, cement hydration reaction is accelerated, high-pressure steam curing after formwork removal in a conventional process is omitted, energy is saved, the self-healing concrete is only arranged at the two ends, prone to cracking, of the prepared pipe pile, the middle, not prone to cracking, of the prepared pipe pile is replaced by the ECC with similar strength, and the self-healing effect of the pipe pile is improved. The performance gradient between the two is gradually changed through a functional gradient method, interface damage is avoided, and the problems that an existing concrete pipe pile is prone to cracking and poor in durability in a corrosion environment can be effectively solved.

Description

technical field [0001] The invention belongs to the technical field of concrete pipe piles, in particular to a functional gradient self-healing high-strength concrete pipe pile and a preparation method thereof. Background technique [0002] Concrete pipe piles, as an important pile foundation material, have been widely used in many large-scale engineering foundation treatments because of their high bearing capacity, convenient construction, short construction period, and low cost. With the sustained and rapid development of the country's economic construction in recent years, the market's demand for concrete pipe piles has rapidly expanded, especially in coastal areas, and it has also raised higher requirements for concrete pipe piles in terms of performance, quality and economy requirements. [0003] Cracks are an inevitable defect of concrete pipe piles. Although the influence of cracks has been considered in the design process of concrete structures, the problem of reduc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D5/30B28B21/68B28B11/24B28B21/82C04B28/04
CPCY02A30/30
Inventor 陈伟宏冯凯
Owner FUZHOU UNIV
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