Preparation method of PC (prestressed concrete) pipe pile with reduction of usage amount of cementing material

A technology for cementing materials and pipe piles is applied in the field of building materials, which can solve the problem of high consumption of cementing materials for prestressed concrete pipe piles, and achieve the effects of facilitating promotion, improving competitiveness and reducing raw material costs.

Inactive Publication Date: 2015-08-12
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In order to solve the problem of high cementitious material consumption of prestressed concrete pipe piles (PC pipe piles), the present invention provides a PC pipe pile preparation method that reduces the cementitious material consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A method for preparing PC pipe piles for reducing the amount of cementitious materials, comprising the steps of:

[0032] 1) Prepare and mix concrete. The total mass of the concrete per cubic meter is 2520kg, of which the mass of cementitious material is 420kg. The mass ratio of water to cementitious material is 0.28:1. 2.0%, the amount of air-entraining agent is 0.005% of the quality of the cementitious material, and the balance is sand and gravel, wherein the mass ratio of sand to sandstone is 0.32:1. In the cementitious material, cement accounts for 65%, and minerals are mixed material accounted for 35%;

[0033] 2) Put the mixed concrete into the feeder to distribute the material, and the pipe pile mold is clamped and stretched;

[0034] 3) The pipe pile is centrifuged, so that the gas introduced by the air-entraining agent in the concrete is squeezed out;

[0035] 4) Steam curing, the curing time is 6~8 hours;

[0036] 5) Pipe pile demoulding;

[0037] 6) Autoc...

Embodiment 2

[0043] A method for preparing PC pipe piles for reducing the amount of cementitious materials, comprising the steps of:

[0044]1) Prepare and mix concrete, the total mass of the concrete per cubic meter is 2500kg, of which the mass of cementitious material is 400kg, the mass ratio of water to cementitious material is 0.3:1, and the amount of water reducing agent is 1% of the mass of cementitious material 1.6%, the amount of air-entraining agent is 0.01% of the mass of the cementitious material, and the balance is sand and gravel, wherein the mass ratio of sand to sandstone is 0.33:1, cement accounts for 70% of the cementitious material, and minerals are mixed material accounted for 30%;

[0045] 2) Put the mixed concrete into the feeder to distribute the material, and the pipe pile mold is clamped and stretched;

[0046] 3) The pipe pile is centrifuged, so that the gas introduced by the air-entraining agent in the concrete is squeezed out;

[0047] 4) Steam curing, the curi...

Embodiment 3

[0056] A method for preparing PC pipe piles for reducing the amount of cementitious materials, comprising the steps of:

[0057] 1) Prepare and mix concrete. The total mass of the concrete per cubic meter is 2480kg, of which the mass of cementitious material is 370kg. The mass ratio of water to cementitious material is 0.32:1. 1.4%, the amount of air-entraining agent is 0.03% of the quality of the cementitious material, and the balance is sand and gravel, wherein the mass ratio of sand to sandstone is 0.35:1, cement accounts for 75% in the cementitious material, and minerals are mixed material accounted for 25%;

[0058] 2) Put the mixed concrete into the feeder to distribute the material, and the pipe pile mold is clamped and stretched;

[0059] 3) The pipe pile is centrifuged, so that the gas introduced by the air-entraining agent in the concrete is squeezed out;

[0060] 4) Steam curing, the curing time is 6~8 hours;

[0061] 5) Pile demoulding;

[0062] 6) Autoclave cu...

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Abstract

The invention discloses a preparation method of a PC (prestressed concrete) pipe pile with reduction of usage amount of a cementing material. The preparation method comprises the following steps of (1) preparing and mixing concrete, wherein the total mass of the concrete per cubic meter is 2450kg to 2520kg, the mass of the cementing material is 320kg to 420kg, the mass ratio of water and the cementing material is 0.28 to 0.32:1, the usage amount of a water reducing agent is equal to 1.2% to 2.0% of the mass of the cementing material, the usage amount of an air entraining agent is equal to 0.005% to 0.08% of the mass of the cementing material, the balance is sand and stone, and the mass ratio of the sand and the stone is 0.32 to 0.36:1; (2) feeding the mixed concrete into a feeding machine to distribute, closing a pipe pile mould, and tensioning; (3) centrifuging the pipe pile; (4) curing by steaming; (5) demoulding the pipe pile; (6) curing by autoclaving. The preparation method has the advantages that by mixing the air entraining agent, the usage amount of the cementing material of the PC pipe pile is reduced, the amount of remained grout is reduced, and the influence on strength and durability is avoided.

Description

technical field [0001] The invention belongs to the field of building materials, in particular to a method for preparing PC pipe piles which reduces the amount of cementitious materials. Background technique [0002] PC pipe piles, that is, prestressed concrete pipe piles, are prefabricated concrete components commonly used in building foundations, and are widely used in various construction, transportation, water conservancy and other projects. [0003] According to the provisions of GB 13476-2009 "Pretensioned Prestressed Concrete Pipe Pile", the concrete strength for PC pipe piles should not be lower than C60. In the production of PC pipe piles, concrete is the largest material, and the decisive factor of the cost of concrete is the cementitious material. If the amount of cementitious materials can be reduced, the cost can be reduced and the competitiveness can be improved. [0004] Under the existing production technology and conditions, the amount of cementitious mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B28B21/30B28B11/24C04B28/02
CPCB28B11/245B28B21/30C04B28/02C04B2103/302C04B2103/304C04B14/06C04B14/02
Inventor 战营杨医博吴小环罗健郭文瑛王恒昌郑怀丘
Owner SOUTH CHINA UNIV OF TECH
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