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Preparation method of autoclaving-free PHC (prestressed high strength concrete) pipe pile with reduction of usage amount of cementing material

A technology of PHC pipe piles and cementitious materials, applied in the field of construction materials, can solve the problem of high cementitious material consumption, achieve the effect of reducing raw material costs, reducing processing costs, and improving competitiveness

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 cementing material consumption of autoclaved pipe piles, the present invention provides a method for preparing autoclaved PHC pipe piles that reduces the amount of cementing materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A method for preparing a non-autoclaved PHC pipe pile that reduces the amount of cementitious material, comprising the steps of:

[0032] 1) Prepare and mix concrete, the total mass of the concrete per cubic meter is 2550kg, of which the mass of cementitious material is 450kg, the mass ratio of water to cementitious material is 0.18:1, and the amount of water reducing agent is 1% of the mass of cementitious material 1.6%, the amount of air-entraining agent is 0.005% of the cementitious material mass, and the balance is sand and gravel, wherein the mass ratio of sand to sandstone is 0.32:1, cement accounts for 55% in the cementitious material, mineral blending material accounted for 45%;

[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 basically squeezed out;

[0035] 4) steam ...

Embodiment 2

[0042] A method for preparing a non-autoclaved PHC pipe pile that reduces the amount of cementitious material, comprising the steps of:

[0043] 1) Prepare and mix concrete, the total mass of the concrete per cubic meter is 2500kg, of which the mass of cementitious material is 420kg, the mass ratio of water to cementitious material is 0.20:1, and the amount of water reducing agent is 1% of the mass of cementitious material 1.4%, the amount of air-entraining agent is 0.01% of the cementitious material mass, and the balance is sand and gravel, wherein the mass ratio of sand to sandstone is 0.33:1, cement accounts for 70% in the cementitious material, mineral blending Materials accounted for 30%. The air-entraining agent in this embodiment is pre-mixed with the water reducer to prepare the air-entraining water reducer for use;

[0044] 2) Put the mixed concrete into the feeder to distribute the material, and the pipe pile mold is clamped and stretched;

[0045] 3) The pipe pile...

Embodiment 3

[0053] A method for preparing a non-autoclaved PHC pipe pile that reduces the amount of cementitious material, comprising the steps of:

[0054] 1) Prepare and mix concrete, the total mass of the concrete per cubic meter is 2490kg, of which the mass of cementitious material is 380kg, the mass ratio of water to cementitious material is 0.22:1, and the amount of water reducing agent is 1% of the mass of cementitious material 1.3%, the amount of air-entraining agent is 0.05% of the mass 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 70% of the cementitious material, and minerals are mixed material accounted for 30%;

[0055] 2) Put the mixed concrete into the feeder to distribute the material, and the pipe pile mold is clamped and stretched;

[0056] 3) The pipe pile is centrifuged, so that the gas introduced by the air-entraining agent in the concrete is basically squeezed out;

[005...

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Abstract

The invention discloses a preparation method of an autoclaving-free PHC (prestressed high strength 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 2480kg to 2550kg, the mass of the cementing material is 450kg to 350kg, the mass ratio of water and the cementing material is 0.18 to 0.25:1, the usage amount of a water reducing agent is equal to 1.1% to 1.6% of the mass of the cementing material, the usage amount of an air entraining agent is equal to 0.005% to 0.10% of the mass of the cementing material, the balance is sand and stone, the mass ratio of the sand and the stone is 0.32 to 0.36:1, and the cementing material comprises cement and mineral mixtures; (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. The preparation method has the advantage that by mixing the air entraining agent, the usage amount of the cementing material of the autoclaving-free PHC 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 present invention is the field of building materials, and it involves a method of free steam -free PHC pipe pipe pile preparation methods that reduce the amount of gel materials. Background technique [0002] The full name of the PHC pipe pile is a prestressed high -strength concrete pipe pile. It is the most commonly used concrete component in the building foundation. It is widely used in various types of buildings, transportation, water conservancy and other projects.my country is the world's largest pipe pile producer and use country, with an annual output of more than 350 million meters in 2011. [0003] At present, the vast majority of PHC pipe pile piles in my country adopt two -stage production process for normal pressure steaming+high -pressure steaming, also known as steaming PHC pipe piles.Due to the disadvantages of high energy consumption and cracking of steaming PHC pipe pipe piles, some researchers have adopted measures such as reducing wa...

Claims

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Application Information

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IPC IPC(8): B28B21/30B28B11/24C04B28/02
CPCB28B21/30B28B11/245C04B28/02C04B2103/302C04B2103/304C04B14/06C04B14/02
Inventor 战营杨医博吴小环赵泽本郭文瑛王恒昌傅国强
Owner SOUTH CHINA UNIV OF TECH
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