Water-borne epoxy resin modified cement mortar repair material and preparation method thereof

A technology of water-based epoxy resin and cement mortar, which is used in construction materials, underground engineering, water conservancy engineering and port fields. It can solve the problems of endangering subway operation, groundwater intrusion into tunnels, and decrease in bonding strength, so as to compensate for its own shrinkage and improve resistance. Penetration ability, reduce the effect of shrinkage deformation

Inactive Publication Date: 2016-03-30
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If it cannot be repaired in time, these cracks will further expand, large cracks will appear, and penetrating cracks will occur, causing groundwater to invade the tunnel, affecting its internal structure and auxiliary pipelines, and ultimately endangering the operation of the subway and reducing the service life of the tunnel project.
[0003] At present, the use of mortar for concrete structure repair in a humid or underwater environment will cause a significant drop in bonding strength, and the epoxy cured product will be in a water environment for a long time, which will adversely affect the bonding stability and durability.
There are relatively few studies on water-based epoxy resin modified cement mortar. The research carried out and the only products on the market are mostly suitable for industrial floors. The performance requirements of the products are low, and the product mechanics and construction performance are difficult to meet the national standards Structural reinforcement specifications and actual engineering requirements cannot be directly used for structural reinforcement

Method used

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  • Water-borne epoxy resin modified cement mortar repair material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Cement, sand, expansion agent, silica fume, water, water-based epoxy resin, curing agent, defoamer, water reducer, the weight percentage of each raw material is: cement 29.1%, sand 58%, expansion agent 0.9%, Silica fume 0.6%, water 5.6%, water-based epoxy resin 3.6%, curing agent 1.8%, defoamer 0.21%, water reducer 0.15%.

Embodiment 2

[0028] Cement, sand, expansion agent, silica fume, water, water-based epoxy resin, curing agent, defoamer, water reducer, the weight percentage of each raw material is: cement 29.2%, sand 58%, expansion agent 0.9%, Silica fume 0.6%, water 7.2%, water-based epoxy resin 2.4%, curing agent 1.2%, defoamer 0.21%, water reducer 0.15%.

Embodiment 3

[0030] Composed of cement, sand, expansion agent, silica fume, water, water-based epoxy resin, curing agent, defoamer, and water reducer, the weight percentage of each raw material is: cement 28%, sand 57%, expansion agent 0.9%, Silica fume 0.6%, water 6.2%, water-based epoxy resin 4.8%, curing agent 2.1%, defoamer 0.21%, water reducer 0.15%.

[0031] As the water-based epoxy mortar obtained in Examples 1, 2, and 3, the performance data are shown in Table 1.

[0032] Table 1 embodiment related performance

[0033]

[0034] Note: The bonding strength is characterized by the bonding flexural strength of modified mortar and concrete.

[0035] As shown in Table 1, the water-based epoxy resin mortar of the present invention has suitable setting time and fluidity, excellent flexural resistance, compressive strength and ultra-high bond strength properties.

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Abstract

The invention provides a water-borne epoxy resin modified cement mortar repair material and a preparation method thereof. According to the formula composition, the water-borne epoxy resin modified cement mortar repair material comprises materials in percentage by weight as follows: 27%-30% of cement, 56%-59% of sand, 0.8%-1.0% of an expanding agent, 0.5%-0.7% of silica fume, 5.0%-7.5% of water, 2.0%-5.0% of water-borne epoxy resin, 1.0%-2.5% of a curing agent, 0.19%-0.22% of an antifoaming agent and 0.14%-0.16% of a water reducing agent. The water-borne epoxy resin modified cement mortar repair material has the characteristics of short setting time, excellent fluidity, high anti-compression and anti-bending strength, seismic resistance, low shrinkage strain, good durability, good water resistance, simplicity in production, convenience in construction and the like, the particularly prominent properties include the ultrahigh bonding strength and the excellent durability, the bonding strength is 100%-200% higher than that of general modified cement mortar, and the cement mortar repair material can be suitable for repairing cracks of concrete structures and is particularly applicable to structural engineering such as a subway, a bridge, an airport runway, an aqueduct, a tunnel lining and the like with higher repair difficulties.

Description

technical field [0001] The invention relates to the fields of building materials, underground engineering, water conservancy engineering, ports and the like, in particular to a repair material for super-adhesive water-based epoxy resin modified cement mortar. Background technique [0002] Subway tunnels are usually below the groundwater level. Under the erosion of groundwater, coupled with the influence of other environmental factors such as geological and hydrological changes, and the vibration generated by locomotive running, the concrete structure of the tunnel will be damaged and cracks will be formed. If it cannot be repaired in time, these cracks will further expand, large cracks will appear, and penetrating cracks will occur, causing groundwater to invade the tunnel, affecting its internal structure and auxiliary pipelines, and ultimately endangering the operation of the subway and reducing the service life of the tunnel project. [0003] At present, the use of mortar...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B24/28
Inventor 高培伟刘书斌马爱群鞠向伟姚应征徐少云凌玲孙亚飞朱阿祥张骏
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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