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Precast concrete pile and manufacturing method thereof

A technology of concrete prefabricated piles and concrete, which is applied in the direction of sheet pile walls, buildings, and foundation structure engineering. It can solve the problems of limited application of machine-made sand and high cost of natural sand, and achieve the goal of improving resource utilization, improving work performance, and reducing costs. Effect

Inactive Publication Date: 2012-11-28
JIANHUA CONSTR MATERIALS (JIANGSU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a concrete prefabricated pile and its production method to solve the problems of high cost of natural sand and limited application of machine-made sand in prestressed concrete prefabricated piles

Method used

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  • Precast concrete pile and manufacturing method thereof
  • Precast concrete pile and manufacturing method thereof
  • Precast concrete pile and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The raw materials of concrete include: cementitious material, fine aggregate, coarse aggregate, admixture and water. The total content of cementitious material is 440kg / m 3 , It is composed of 55wt% cement and 45wt% silica sand powder, among which the cement is Portland cement with strength grade 42.5, and the specific surface area of ​​silica sand powder is 300m 2 / kg; water-binder ratio is 0.34; sand ratio is 36%; fine aggregate is 95wt% natural sand and 5wt% machine-made sand, among which the fineness modulus of natural sand is 2.8, the mud content is ≤2.0wt%, machine-made sand It is prepared from mine tailings by mechanical crushing, grading screening and dust removal treatment. The fineness modulus is 3.2. The particle gradation meets the requirements of the standard sand II zone. The stone powder content is 4wt%; the coarse aggregate is crushed stone. ~25mm continuous gradation, crushing value is 8%, needle-like particle content is 7%; the admixture is a naphthalene...

Embodiment 2

[0040] The raw materials of concrete include: cementitious material, fine aggregate, coarse aggregate, admixture, and water. The total content of cementitious material is 480kg / m 3 , It is composed of 80wt% cement and 20wt% fly ash. The cement is ordinary Portland cement with a strength grade of 52.5. The fly ash meets the requirements of grade II fly ash in the GB / T1596 standard; the water-binder ratio is 0.36; The sand ratio is 40%; the fine aggregate is 30wt% natural sand and 70wt% machine-made sand. The natural sand has a fineness modulus of 2.9 and a mud content of ≤2.0% by weight. The machine-made sand is mechanically crushed and graded by industrial waste residues. It is prepared with sieving and dust removal treatment, the fineness modulus is 3.4, the particle gradation meets the requirements of the standard sand II zone, the stone powder content is 5wt%; the coarse aggregate is crushed stone, 5-25mm continuous grading, crushing value It is 8%, and the content of needle...

Embodiment 3

[0042] The raw materials of concrete include: cementitious material, fine aggregate, coarse aggregate, admixture and water. The total content of cementitious material is 400kg / m3, composed of 100wt% cement, of which the cement is ordinary Portland cement with strength grade 42.5; the water-binder ratio is 0.40; the sand ratio is 30%; the fine aggregate is 100wt% machine-made sand , Among them, machine-made sand is made by mechanical crushing, grading screening and dust removal treatment of mine tailings, with a fineness modulus of 2.3, particle grading meets the requirements of standard sand I zone, and stone powder content of 8wt%; coarse aggregate It is crushed stone, 5~25mm continuous gradation, crushing value is 8%, needle-like particle content is 7%; admixture is polycarboxylate high-performance water reducing agent, solid content is the total weight of gelling material 0.5wt%.

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Abstract

The invention provides a precast concrete pile and a manufacturing method thereof. The precast concrete pile is obtained by mounting concrete into a mold mounted with a reinforcement cage framework, closing the mold, tensioning the mold, centrifugally shaping the mold, curing the mold by steam at a normal pressure; releasing the mold and curing the concrete by steam at a high pressure; raw materials of the concrete comprise a cementing material, a fine aggregate, a coarse aggregate, an admixture and water, wherein the fine aggregate is a machine-made sand or a mixture of the machine-made sand and a natural sand; the percentage of the machine-made sand in the fine aggregate by weight is 5-100%; the machine-made sand is obtained by mechanically crushing stone raw materials, such as mine tailings, industrial tailings and the like, screening the crushed stone raw materials in a graded way and removing dust from the screened stone raw materials; fineness modulus of the machine-made sand is 2.3-3.8; grain gradation of the machine-made sand meets requirements on an area 1 or an area 2 of a standard sand; and stone powder content of the machine-made sand is 2-8 wt%. According to the invention, the concrete cost is reduced and resource utilization rate is increased; and the used machine-made sand has the advantages of low silt content and controllable stone powder content, so that the performance of the precast concrete pile is improved.

Description

Technical field [0001] The invention relates to the technical field of concrete building materials, in particular to a concrete precast pile and a production method thereof. Background technique [0002] Sand is the main material of concrete. With the rapid development of the construction industry, the amount of sand used in construction is increasing, and the quality requirements are getting higher and higher, while the natural sand resources are getting less and less, which causes engineering quality problems. , And the destruction of farmland and water resources are becoming more and more serious. Therefore, the research and application of artificial sand is imperative. [0003] From the beginning of my country's machine-made sand in the 1960s, the application research of machine-made sand has become mature day by day. Its application range has been expanded from the construction industry to roads, railways, hydropower, metallurgy and other systems, and from retaining engineerin...

Claims

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Application Information

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IPC IPC(8): E02D5/30C04B28/04
Inventor 苟德胜李斌斌
Owner JIANHUA CONSTR MATERIALS (JIANGSU) CO LTD
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