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

A PHC pipe pile and cementitious material technology, applied in the field of building materials, can solve the problem of high consumption of autoclaved pipe pile cementitious materials, and achieve the effects of facilitating promotion, reducing raw material 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

[0012] In order to solve the problem of high cementing material consumption of autoclaved pipe piles, the present...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A method for preparing an autoclaved PHC pipe pile that reduces the amount of cementitious material, comprising the steps of:

[0033] 1) Prepare and mix concrete, the total mass of the concrete per cubic meter is 2550kg, of which the mass of cementitious material is 420kg, the mass ratio of water to cementitious material is 0.24:1, and the amount of water reducer is 1% of the mass of cementitious material 3.0%, the amount of air-entraining agent is 0.005% of the cementitious material quality, and the balance is sand and gravel, wherein the mass ratio of sand to sandstone is 0.32:1, cement accounts for 65% in the cementitious material, ground quartz Sand accounted for 35%;

[0034] 2) Put the mixed concrete into the feeder to distribute the material, and the pipe pile mold is clamped and stretched;

[0035] 3) The pipe pile is centrifuged so that the gas introduced by the air-entraining agent in the concrete is basically squeezed out;

[0036] 4) Steam curing, the cur...

Embodiment 2

[0045] A method for preparing an autoclaved PHC pipe pile that reduces the amount of cementitious material, comprising the steps of:

[0046] 1) Prepare and mix concrete, the total mass of the concrete per cubic meter is 2520kg, of which the mass of cementitious material is 400kg, the mass ratio of water to cementitious material is 0.26:1, and the amount of water reducing agent is 1% of the mass of cementitious material 2.5%, the amount of air-entraining agent is 0.01% of the cementitious material quality, 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, ground quartz Sand accounts for 30%;

[0047] 2) Put the mixed concrete into the feeder to distribute the material, and the pipe pile mold is clamped and stretched;

[0048] 3) The pipe pile is centrifuged so that the gas introduced by the air-entraining agent in the concrete is basically squeezed out;

[0049] 4) Steam curing, th...

Embodiment 3

[0058] A method for preparing an autoclaved PHC pipe pile that reduces the amount of cementitious material, comprising the steps of:

[0059] 1) Prepare and mix concrete, the total mass of the concrete per cubic meter is 2500kg, of which the mass of cementitious material is 370kg, the mass ratio of water to cementitious material is 0.28:1, and the amount of water reducing agent is 1% of the mass of cementitious material 2.0%, the amount of air-entraining agent is 0.03% of the cementitious material quality, and the balance is sand and gravel, wherein the mass ratio of sand to sandstone is 0.35:1, cement accounts for 70% in the described cementitious material, ground quartz Sand accounts for 30%;

[0060] 2) Put the mixed concrete into the feeder to distribute the material, and the pipe pile mold is clamped and stretched;

[0061] 3) The pipe pile is centrifuged so that the gas introduced by the air-entraining agent in the concrete is basically squeezed out;

[0062] 4) Steam ...

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PUM

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Abstract

The invention discloses a preparation method of an autoclaving 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 420kg to 340kg, the mass ratio of water and the cementing material is 0.24 to 0.30:1, the usage amount of a water reducing agent is equal to 1.5% to 3.0% of the mass of the cementing material, the usage amount of an air entraining agent is equal to 0.005% to 0.07% 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) autoclaving by steaming. The preparation method has the advantage that by mixing the air entraining agent, the usage amount of the cementing material of the autoclaving 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 invention belongs to the field of building materials, and in particular relates to a method for preparing autoclaved PHC pipe piles which reduces the amount of cementing materials. Background technique [0002] The full name of PHC pipe pile is prestressed high-strength concrete pipe pile. It is the most commonly used concrete component in building foundations and is widely used in various construction, transportation, water conservancy and other projects. my country is the largest producer and user of pipe piles in the world. In 2011, the national annual output exceeded 350 million meters. [0003] At present, the vast majority of PHC pipe piles in my country are produced by the two-stage production process of atmospheric pressure steam curing + high pressure steam curing, also known as autoclaved PHC pipe piles. The cementitious material of the autoclaved PHC pipe pile is mainly composed of cement and finely ground quartz sand. Among them, the ...

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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