A kind of intelligent slow-bonding prestressed steel strand and preparation method thereof

A slow-bonding prestressed and prestressed steel strand technology, which is applied in the engineering field, can solve the problems of poor high temperature aging resistance and lack of heat resistance stability, so as to improve high temperature aging resistance, durable mechanical properties, The effect of good heat resistance

Active Publication Date: 2022-07-22
BEIJING ACAD OF BUILDING ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The retarding gel adhesive disclosed in the above patent can only combine the steel bar with the outer sheath, fill the gaps in the steel bar and seal it tightly, and obtain certain mechanical properties after curing, but it does not have good heat resistance and stability. The high-temperature aging performance is not good, therefore, the improvement research on this aspect will help to expand the application of slow-bonding prestressed steel strands, and then further promote the intelligent slow-bonding prestressed steel strands

Method used

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  • A kind of intelligent slow-bonding prestressed steel strand and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Preparation of Fluorinated Polyamides

[0051] 1. The tetrafluorosuccinic acid and tetraethylene pentamine whose molar ratio of carboxyl group and primary amino group is 1:1.2 are added to the reaction kettle of nitrogen atmosphere, pressurized to 0.3MPa, and stirred in 1.5h While heating up to 140°C, the pressure rose to 1.8MPa at this time, and the pressure was kept constant by intermittently removing the generated water vapor and the temperature in the kettle was kept at 150°C for 2h;

[0052] 2. Release the pressure of the reaction kettle to normal pressure, and react at a constant temperature of 140 °C; then evacuate to -0.08MPa, and perform a constant temperature reaction at 140 °C. Finally, pressurize the reaction kettle to normal pressure and cool down to 60 °C, and continue to stir and react at a constant temperature for 1 hour. ;

[0053] 3. Cool the reaction kettle to 23°C, stop stirring, and discharge to obtain fluorine-containing polyamide.

[0054] Pr...

Embodiment 2

[0062] The rest are the same as in Example 1, except that in the preparation process of the slow-bonding adhesive, the curing agent consists of 13.64 parts of fluorinated polyamide prepared, 13.64 parts of 650 low molecular weight polyamide, 2.72 parts of carboxyl-functionalized organic polyamide Silicon compound.

Embodiment 3

[0064] The rest is the same as in Example 1, except that in the preparation process of the slow-bonding adhesive, the curing agent consists of 21.43 parts of fluorine-containing polyamide prepared, 7.14 parts of 650 low molecular weight polyamide, 1.43 parts of carboxyl-functionalized organic polyamide Silicon compound.

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Abstract

The invention provides an intelligent slow-bonding prestressed steel strand and a preparation method thereof. The intelligent slow-bonding prestressed steel strand comprises: a fiber-reinforced composite smart bar of an optical fiber sensor, an edge wire, and a slow-bonding type bond agent and sheath, the edge wire is kinked on the outer circumference of the smart bar to form an intelligent prestressed steel strand, and the slow-bonding adhesive is coated on the outer circumference of the intelligent prestressed steel strand, so that the intelligent prestressed steel strand is formed. The stranded wire is bonded to the sheath; the raw materials for preparing the slow-bonding adhesive include: epoxy resin, curing agent, diluent and filler. The slow-bonding adhesive adopts the compound of fluorine-containing polyamide, low-molecular-weight polyamide and carboxyl-functional silicone as a curing agent to cure the main resin, and utilizes the curing reaction of carboxyl and epoxy groups. Organosilicon is introduced into the slow-adhesion adhesive to obtain the slow-adhesion adhesive with good heat resistance and high temperature aging resistance.

Description

technical field [0001] The invention belongs to the technical field of engineering, and in particular relates to an intelligent slow-bonding prestressed steel strand and a preparation method thereof. Background technique [0002] The intelligent slow-bonding prestressed steel strand is a technology that combines the slow-bonding prestressed steel strand and the fiber grating sensor. Monitoring the stress state during construction and service periods, this technology avoids the shortcomings of traditional detection methods such as low accuracy, poor operability, large interference and poor stability, and is useful for understanding the working performance of components and guiding prestress tension. Pulling and post-maintenance are of great help. [0003] The key part of the intelligent slow-bonded prestressed steel strand - the slow-bonded prestressed steel strand is made by wrapping the prestressed steel strand with a slowly solidifying adhesive, and then wrapping it with ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J163/00C09J11/04C08G59/48C08G59/42G01L1/24G01L5/04
CPCC09J163/00C09J11/04C08G59/48C08G59/4284C08G59/423G01L1/242G01L5/04C08K3/36
Inventor 吕李青张鹏兰春光张喆秘红丹杜彦凯支超刘鲁
Owner BEIJING ACAD OF BUILDING ENG
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