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Non-autoclaved admixture for PHC tubular pile and method for preparing PHC tubular pile

A PHC pipe pile and pressure-free steaming technology, applied in the field of building materials, can solve the problems of poor workability of pipe pile concrete, long steam curing time at room temperature, and difficult promotion of products, etc., to achieve good durability, reduce viscosity and concrete hydration Effect of heating, improving workability

Active Publication Date: 2020-05-05
河北科晖环境资源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is that the existing normal temperature steam curing time is long, the cost of materials is high, and the concrete for preparing pipe piles is poor in workability, which makes it difficult to promote the product and has great limitations

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A method for preparing PHC pipe piles by using the described pressure-free steaming admixture for PHC pipe piles, the specific steps are as follows:

[0046] First, the raw materials are composed and proportioned as 62.8wt% ultrafine slag powder, 28.0wt% grade II fly ash, 8.0wt% desulfurized gypsum, and 1.2wt% activator, and then the weighed raw materials are sent into the mixer Or the ball mill mixes and grinds evenly, and after passing the test, it is transported to the finished product warehouse or finished product warehouse for storage.

[0047] The pressure-free steaming admixture of the prepared prestressed high-strength concrete pipe pile is added to the concrete cementitious material, and mixed with machine-made sand, crushed stone, water and admixture to prepare a prestressed concrete mixture; The test results of the prestressed concrete's outgoing state and compressive strength are: the initial slump is 220mm, and the initial expansion is 450mm.

[0048] Wher...

Embodiment 2

[0061] First, the raw materials are composed and proportioned as 64wt% ultrafine slag powder, 27.0wt% grade II fly ash, 7.5wt% desulfurized gypsum, and 1.5wt% activator, and then the weighed raw materials are sent into the mixer or The ball mill mixes and grinds evenly, and after passing the test, it is transported to the finished product warehouse or finished product warehouse for storage.

[0062] The pressure-free steaming admixture of the prepared prestressed high-strength concrete pipe pile is added to the concrete cementitious material, and mixed with machine-made sand, crushed stone, water and admixture to prepare a prestressed concrete mixture; The test results of the prestressed concrete's exit state and compressive strength are: the initial slump is 220mm, and the initial expansion is 460mm;

[0063] Among them: the design bulk density of prestressed concrete is 2500kg / m 3 , including cementitious material is 355.5kg / m 3 P·O4 2.5 cement, 94.5kg / m 3 Non-pressure st...

Embodiment 3

[0070] First, the raw materials are composed and proportioned as 65.5wt% ultrafine slag powder, 26.0wt% grade II fly ash, 7.0wt% desulfurized gypsum, and 1.5wt% activator, and then the weighed raw materials are sent into the mixer Or the ball mill mixes and grinds evenly, and after passing the test, it is transported to the finished product warehouse or finished product warehouse for storage.

[0071] The pressure-free steaming admixture of the prepared prestressed high-strength concrete pipe pile is added to the concrete cementitious material, and mixed with machine-made sand, crushed stone, water and admixture to prepare a prestressed concrete mixture; The test results of the prestressed concrete's exit state and compressive strength are: the initial slump is 220mm, and the initial expansion is 470mm;

[0072] Among them: the design bulk density of prestressed concrete is 2500kg / m 3 , including cementitious material is 396kg / m 3 P·O42.5 cement, 54kg / m 3 Non-pressure steam...

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Abstract

The invention provides a non-autoclaved admixture for a PHC tubular pile and a method for preparing the PHC tubular pile, and belongs to the technical field of building materials. The non-autoclaved admixture for the PHC tubular pile is prepared from the following components in percentage by weight: 58-74% of superfine slag powder, 20-30% of II-grade coal ash, 5-10% of desulfurized gypsum and 1.0-2.0% of excitant, wherein the total is 100%. The non-autoclaved admixture for the PHC tubular pile is prepared by the following steps: uniformly mixing the components in percentage by mass; adding thepre-stressed concrete into a cementing material and stirred with aggregate, an additive and water to prepare a pre-stressed concrete mixture, preparing the pre-stressed high-strength concrete pipe pile with stable later strength and excellent durability, and finally, performing short-time maintenance of a normal-pressure steam maintenance process. An autoclaving process in the production processof the pipe pile can be omitted, the workability of concrete is improved, the steam curing time is shortened, and the production cost is effectively reduced.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a non-pressure steaming admixture for PHC pipe piles and a method for preparing PHC pipe piles. Background technique [0002] PHC pipe piles, also known as prestressed high-strength concrete pipe piles, are currently the most used cement product components in infrastructure construction. They have the advantages of high single pile strength, wide adaptability, convenient transportation, and convenient construction. They have been widely used in All kinds of civil buildings, road and railway bridges, port terminals and other engineering structures. [0003] At present, most PHC pipe piles adopt the centrifugal forming process, and the combination of "steam curing + autoclaving" curing method is used to obtain high-strength pipe piles. That is, 60-95°C atmospheric pressure steam curing for 4-8h, demoulding, and then 8-12 atmospheric pressure, 180°C high-pressure steam c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/12C04B28/02
CPCC04B40/0039C04B28/02C04B2201/50C04B18/141C04B18/08C04B14/06C04B14/02C04B22/085C04B24/122C04B22/145
Inventor 温煦郝军中汤畅冯彦亮
Owner 河北科晖环境资源有限公司
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