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Preformed material for post-tensioned prestressing pipeline vacuum grouting or mudjacking and preparation method thereof

A technology of prestressed pipeline and post-tensioning method, which is applied in the fields of clay preparation equipment, chemical instruments and methods, solid waste management, etc. Full state and other problems, to achieve the effect of good pumpability, low cost and good fluidity

Active Publication Date: 2009-12-16
HUBEI CHIDGE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main manifestations are: (1) The fluidity of the freshly mixed slurry is not good, and the pumpability is poor; (2) The slurry has a large bleeding, which is easy to segregate and stratify, and the slurry is powdered at the high point, and the pipeline is difficult to be full; (3) After hardening, the slurry is not dense, there are many voids, and the bond with the prestressed tendons is not solid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The following is calculated according to the weight percentage of each component in the prefabricated material:

[0022] Cement 76% U-shaped high-efficiency expansion agent 8%

[0023] Wollastonite 10% (particle size 0.05-60μm) Kaolin 6% (particle size 0.05-60μm)

[0024] Molasses retarder 0.4% Sodium alkylsulfonate air-entraining agent 0.015%

[0025] Calcium Lignosulfonate Rust Inhibitor 0.5% Melamine Water Reducer 0.3%

[0026] Methylcellulose 0.06%

[0027] Mix the above raw materials to obtain the prefabricated material, then put the prefabricated material and water into the mixer according to the water-cement ratio of 0.3 and stir, the speed of the mixer is not lower than 1000r / min, and the linear speed of the paddle is limited within 15m / s , and stirred for 5 minutes to prepare the grouting material.

[0028] The above-mentioned grouting material uses a funnel viscometer to measure the outflow time of 1725mL slurry. The initial fluidity is 18s, and the fluid...

Embodiment 2

[0030] The following is calculated according to the weight percentage of each component in the prefabricated material:

[0031] Cement 90% Sulphoaluminate expansion agent 6%

[0032] 2% blast furnace slag (0.05-60μm particle size) 2% fly ash (0.05-60μm particle size)

[0033] Molasses retarder 0.4% Rosin thermal polymer air-entraining agent 0.015%

[0034] Calcium nitrite rust inhibitor 2% Naphthalene superplasticizer 0.37%

[0035] Methylcellulose 0.06%

[0036] Mix the above raw materials to obtain the prefabricated material, then put the prefabricated material and water into the mixer according to the ratio of water-cement ratio 0.32, the speed of the mixer is not lower than 1000r / min, and the linear speed of the paddle is limited within 15m / s , and stirred for 5 minutes to prepare the grouting material.

[0037] The above-mentioned grouting material uses a funnel viscometer to measure the outflow time of 1725mL slurry. The initial fluidity is 20s, and the 30min fluidi...

Embodiment 3

[0039] The following is calculated according to the weight percentage of each component in the prefabricated material:

[0040] Cement 85% Alunite expansion agent 6%

[0041] Coal gangue 4% (particle size 0.05-60μm) Calcite 5% (particle size 0.05-60μm)

[0042] Hydroxycarboxylic acid and its salt retarder 0.1% Sodium alkylsulfonate air-entraining agent 0.01%

[0043] Amino alcohol rust inhibitor 0.4% Polycarboxylate water reducer 0.4%

[0044] Polyacrylamide 0.03% (molecular weight 0.5 million to 10 million)

[0045] Mix the above raw materials to obtain the prefabricated material, then put the prefabricated material and water into the mixer according to the ratio of water-cement ratio 0.26, the speed of the mixer is not lower than 1000r / min, and the linear speed of the paddle is limited within 15m / s , and stirred for 5 minutes to prepare the grouting material.

[0046] The above-mentioned grouting material uses a funnel viscometer to measure the outflow time of 1725mL slurr...

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Abstract

The invention discloses a preformed material for post-tensioned prestressing pipeline vacuum grouting or mudjacking and a preparation method thereof. The preformed material includes the following components by weight percent: 65 to 95 percent of silicate cement, 0.01 to 3 percent of high-range water-reducing agent, 0 to 1 percent of stabilizing agent, 0.05 to 5 percent of retarding agent, 1 to 20 percent of expanding agent, 0.2 to 2 percent of corrosion inhibitor, 0.01 to 1 percent of air entraining agent and 0 to 30 percent of mineral materials, wherein by uniformly and proportionally mixing the silicate cement, the high-range water-reducing agent, the stabilizing agent, the retarding agent, the expanding agent, the corrosion inhibitor, the air entraining agent and the mineral materials, the post-tensioned prestressing pipeline vacuum grouting or mudjacking preformed material can be obtained. After being uniformly mixed and stirred with water with neutral pH value according to the water cement ratio ranging from 0.24 to 0.32, the preformed material can be used, the obtained grouting material has the advantages of low water cement ratio, favorable flowability, no water bleeding and delamination, and favorable pumpability; meanwhile, the preparation method of the preformed material is simple and the raw material sources of the preformed material are wide.

Description

technical field [0001] The invention relates to a vacuum grouting or grouting prefabricated material for a post-tensioned prestressed pipeline and a preparation method thereof, belonging to the field of construction materials. Background technique [0002] With the rapid development of my country's economy, my country's highway and railway construction has entered a period of rapid development. In order to ensure the service life of the bridge, how to make the key grouting of the prestressed pipeline of the bridge dense, reduce the loss of prestress, and prevent the steel bars from rusting is a key technical problem. Vacuum grouting or grouting construction technology for bridge post-tensioned prestressed pipelines is a new technology for large-scale bridge construction. In prestressed structures, the quality of grouting directly affects the safety and reliability of the structure. The prestressed grouting material is a key material to protect the prestressed steel bar fro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04B28C5/00B28C7/04
CPCC04B2111/70C04B2103/302C04B28/02Y02W30/91C04B14/06C04B14/365C04B18/08C04B22/008C04B24/2652C04B24/32C04B24/38C04B2103/20C04B2103/304C04B2103/61C04B22/04C04B22/064C04B22/085C04B22/148C04B22/16C04B24/045C04B24/06C04B24/10C04B24/123C04B24/16C04B24/34C04B24/223C04B24/226C04B24/2641
Inventor 侯书恩靳洪允黄玉娟黄丹张晓霞
Owner HUBEI CHIDGE TECH
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