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A modified epoxy resin anti-seepage plugging grouting method for concrete in alpine regions

An epoxy resin and concrete technology, which is applied in the field of modified epoxy resin anti-seepage plugging grout for concrete in alpine regions, can solve the problems of frequent thermal expansion and contraction, high initial viscosity, and insufficient construction operation time, etc., to achieve Meet the needs of engineering applications, reduce the initial viscosity, and ensure the effect of operating time

Active Publication Date: 2019-07-30
UNIT 61489 OF PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, conventional epoxy resin grouting materials generally solidify slowly and are brittle, and are often only suitable for grouting at room temperature. In alpine regions, due to restrictions on construction conditions, the construction environment and use environment are in low temperature environments. , the conventional epoxy resin grouting material has a slow curing rate, and generally needs to be cured for more than 24 hours at room temperature, which cannot meet the application requirements of engineering in a low temperature environment; while the initial viscosity of the faster curing epoxy resin grouting material is relatively large, Moreover, the viscosity rises rapidly with time, resulting in insufficient construction and operation time, and it is difficult to meet the application requirements
In addition, in the alpine region, due to repeated freeze-thaw cycles, the thermal expansion and contraction are frequent, so the grouting material is required to have good toughness, so as to avoid the deformation caused by the thermal expansion and contraction, which will cause the grouting material to fall off and crack. Or broken, the commonly used epoxy resin grouting material is brittle and difficult to meet the application requirements

Method used

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  • A modified epoxy resin anti-seepage plugging grouting method for concrete in alpine regions
  • A modified epoxy resin anti-seepage plugging grouting method for concrete in alpine regions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In a 250 mL four-neck flask, add 10 g of trimethoxy-terminated silicone oil PDMS (Mn=10000), 90 g of epoxy resin E-44, add 3 drops of catalyst dibutyltin dilaurate, and heat under reflux at 120 °C for 5 h Afterwards, it is distilled under reduced pressure until no more bubbles are generated, and the residue in the kettle is the modified epoxy resin. Take this epoxy resin 40 g, furfural acetone reactive diluent 45 g, curing agent N-(β-aminoethyl)-γ-aminopropyl trimethoxysilane hydrolyzate 13 g and accelerator DMP-30 2 g, The grouting material is obtained by stirring evenly at 0 °C, and the basic properties of the grouting material are shown in Table 1.

Embodiment 2

[0035] In a 250 mL four-neck flask, add 10 g of triethoxy-terminated silicone oil PDMS (Mn=10000), 90 g of epoxy resin E-51, add 3 drops of catalyst dibutyltin dilaurate, and heat under reflux at 120 °C for 5 After h, vacuum distillation was performed until no more bubbles were generated, and the residue in the kettle was the modified epoxy resin. Take the epoxy resin 30 g, furfural acetone reactive diluent 50 g, curing agent N-(β-aminoethyl)-γ-aminopropyl triethoxysilane hydrolyzate 18 g and accelerator DMP-30 2 g , the grouting material is obtained by stirring evenly at 0 °C, and the basic properties of the grouting material are shown in Table 1.

Embodiment 3

[0037] In a 250 mL four-neck flask, add 10 g of trimethoxy-terminated silicone oil PDMS (Mn=10000), 90 g of epoxy resin E-44, add 3 drops of catalyst dibutyltin dilaurate, and heat under reflux at 120 °C for 5 h. , distilled under reduced pressure until no more bubbles are produced, and the residue in the kettle is the modified epoxy resin. Take the epoxy resin 40 g, furfural acetone reactive diluent 38 g, curing agent N-(β-aminoethyl)-γ-aminopropyl triethoxysilane hydrolyzate 20 g and accelerator DMP-30 2 g , the grouting material is obtained by stirring evenly at 0 °C, and the basic properties of the grouting material are shown in Table 1.

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Abstract

The invention belongs to the technical field of high molecular fine chemical engineering, and discloses a modified epoxy resin seepage-prevention and leak-stopping grouting material and a modified epoxy resin seepage-prevention and leak-stopping method for concrete in an arctic-alpine area. The modified epoxy resin grouting material is prepared from 40 to 60 parts of modified epoxy resin, 25 to 50 parts of active diluting agent, 10 to 20 parts of curing agent and 2 parts of accelerating agent, and is obtained by mixing the modified epoxy resin, the active diluting agent, the curing agent and the accelerating agent at 0 to 5 DEG C. The modified epoxy resin grouting material is lower in viscosity at a low temperature, good in toughness and good in freezing and thawing resisting cycle performance, is not obviously decreased in mechanical performance after undergoing a freezing-and-thawing cycle for above 50 times, is sufficient in operating time, is appropriate in curing time, has the curing time which is approximately 10h to 15h after the mixing, is guaranteed in use effect through the appropriate curing time, and is good in bonding performance. The adopted grouting material has the wet-base-surface bonding strength which is more than 4MPa and the dry-base-surface bonding strength which is more than 3.5MPa; thus, the use requirement of a project in the arctic-alpine area can be met.

Description

technical field [0001] The invention belongs to the technical field of macromolecular fine chemicals, and relates to a method for preventing seepage, plugging, and grouting of modified epoxy resin for concrete in alpine regions. Background technique [0002] Concrete cracks are one of the most common and common diseases in concrete engineering. my country has a vast territory and a large amount of concrete engineering. Many concrete projects in the 1980s and 1990s have produced cracks of varying degrees, especially in alpine regions. damage, the leakage of water is more serious. Cracks in concrete may reduce its mechanical properties, greatly reduce its service life, and easily lead to safety accidents. Once cracks in concrete occur, if not effectively controlled, it will greatly speed up the intrusion of harmful media into the interior of the concrete structure, causing the mechanical properties and even the durability of the concrete structure to gradually degrade and com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G59/50C08G59/14
CPCC08G59/14C08G59/504
Inventor 潘水艳李英军罗文曹少华黄驰胡铭杰高杰王昱蘅李磊
Owner UNIT 61489 OF PLA
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