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Molding method of rolling spraying process PCCP (Prestressed Concrete Cylinder Pipe) protective layer mortar indoor detection test piece

A molding method and protective layer technology, which are applied in the preparation of test samples, the use of stable tension/compression to test the strength of materials, and measuring devices, etc., to achieve the effects of less human factors, easy operation and good repeatability

Inactive Publication Date: 2019-08-02
NANJING RUIDI HIGH TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the inaccuracy of the molding method for making mortar specimens in the chamber of the PCCP protective layer mortar produced by the roller injection process stipulated in the existing test specifications, the present invention provides a method for forming the test specimens in the chamber of the PCCP protective layer mortar chamber of the roller injection process. The molding method is easy to operate and can accurately reflect the performance of the PCCP protective layer mortar produced by the on-site roller injection process

Method used

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  • Molding method of rolling spraying process PCCP (Prestressed Concrete Cylinder Pipe) protective layer mortar indoor detection test piece
  • Molding method of rolling spraying process PCCP (Prestressed Concrete Cylinder Pipe) protective layer mortar indoor detection test piece

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Embodiment 1

[0024] In this embodiment, a method for forming a test piece of PCCP protective layer mortar in the roller injection process is to directly mix the mortar taken from the production site and divide it into molds for four times; each time the mortar is slightly inserted along the inner wall of the test mold. For the mold, the amount of mold input is as follows: the first time it is installed to 3 / 4 of the height of the steel mold, the second time it is installed until the top of the steel mold is flush, and the third and fourth additions of mortar are respectively 10mm higher than the test mold opening; After each layer is installed, use a press to continuously and evenly load to 13MPa at a speed of 0.5MPa-0.8MPa per second, unload after 20s at a constant pressure, and prepare a mortar specimen according to the method described in Example 8.

Embodiment 2

[0026] A kind of forming method of the test piece of the indoor inspection test piece of the PCCP protective layer mortar of the present embodiment, the mortar taken from the production site is added into the water of 2% of the cementitious material consumption in the mortar mix ratio of the production protective layer, mix well and divide into four Install the mold for the first time; every time the mortar is slightly inserted along the inner wall of the test mold and tamped into the mold, the modulus is as follows: the first time it is installed to 3 / 4 of the height of the steel mold, the second time it is installed until the top of the steel mold is flush, The third and fourth additions of mortar are respectively 10 mm higher than the test mold opening; after each layer is installed, use a press to continuously and evenly load to 13 MPa at a rate of 0.5 MPa to 0.8 MPa per second, and unload after 20 seconds of constant pressure, according to Example 8 The described method ma...

Embodiment 3

[0028] A kind of molding method of the test piece in the room of the PCCP protective layer mortar of the present embodiment, the mortar taken from the production site is added to the water of 4% of the cementitious material consumption in the mortar mix ratio of the production protective layer, mixed well and divided into four parts. Install the mold for the first time; every time the mortar is slightly inserted along the inner wall of the test mold and tamped into the mold, the modulus is as follows: the first time it is installed to 3 / 4 of the height of the steel mold, the second time it is installed until the top of the steel mold is flush, The third and fourth additions of mortar are respectively 10 mm higher than the test mold opening; after each layer is installed, use a press to continuously and evenly load to 13 MPa at a rate of 0.5 MPa to 0.8 MPa per second, and unload after 20 seconds of constant pressure, according to Example 8 The described method makes mortar speci...

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Abstract

The invention relates to a molding method of a rolling spraying process PCCP (Prestressed Concrete Cylinder Pipe) protective layer mortar indoor detection test piece. The molding method is characterized by comprising the following steps: I, adding a certain amount of water into mortar taken from a production field, mixing evenly and filling a die with the mixture by four times; II, placing a cushion block on an in-die mortar surface after each die filling, and placing the whole test die on upper and lower pressing plates or a backing plate of a pressure tester, wherein the center of the test piece needs to be aligned with the center of the lower pressing plate; and III, increasing to a certain load to load under a constant pressure for a period of time, and unloading. After pressure molding is performed by four times, residual mortar is scraped and leveling is performed. The mortar test piece made by the molding method has density close to protective layer mortar produced with a rolling spraying process, and can be taken as a performance judging test piece of rolling spraying mortar. The molding method is easy and convenient to operate, and can accurately reflect the performance ofthe rolling spraying mortar which is difficult to detect in a field laboratory.

Description

technical field [0001] The invention relates to the technical field of making indoor test pieces of PCCP protective layer mortar, in particular to a method for making indoor test pieces of mortar produced by a roller injection process. Background technique [0002] Prestressed steel cylinder concrete pipe (referred to as PCCP) is the first generation of prestressed concrete pressure pipe developed on the basis of the introduction and assimilation of advanced technology and key equipment from the United States in the past ten years. PCCP pipe products are environmentally friendly, low production cost, fast construction speed, and good durability. In recent years, they have been widely promoted and applied in domestic large-scale water transmission projects. According to the role of each layer of materials in the PCCP structure, the importance of the surface protective layer mortar is obviously higher than that of the ordinary reinforced concrete structure. Sulfate, anti-chlo...

Claims

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Application Information

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IPC IPC(8): G01N1/36G01N1/28G01N3/08G01N33/38
CPCG01N1/286G01N1/36G01N3/08G01N33/383G01N2001/366
Inventor 王冬孙国荣祝烨然陈国新李文峰徐志峰唐修生王金智姚晓敏张晋峰
Owner NANJING RUIDI HIGH TECH