Repair composition for concrete structural components of slab ballastless track, its preparation method and use

Abstract

The invention provides a maintaining composition for a concrete structural component of a slab ballastless track, a preparation method and an application of the maintaining composition. The maintaining composition comprises a component A, a component B and a component C, wherein the component A is modified epoxy resin, the component B is a modified amine cured component, and the component C is filler; and the mass ratio of the component A to the component B is (2-4):1, and the mass ratio of the mixture of the component A and the component B to the component C is 1:(0.5-4). The composition has the advantages of high curing speed, strong adaptability, large application range, excellent mechanical performance, stable weather resistance, excellent dynamic loading performance, small toxicity and the like.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a rapid maintenance material for concrete structural components of a slab ballastless track and a preparation method thereof. Background technique [0002] my country is building large-scale passenger dedicated lines and high-speed railways. By 2020, as my country's high-speed railways have formed the framework of "four vertical and four horizontal" passenger dedicated lines, rapid passenger transport systems will be built in the Bohai Rim, Yangtze River Delta, and Pearl River Delta regions. [0003] Ballastless track is the main choice for various express passenger lines and high-speed rail. At present, the main types of ballastless track for high-speed railways in my country are CRTS type I, type II, type III, double-block type and long sleeper embedded type. Regardless of the type, concrete is used as the main body of the building structure. Due to the complexity...

AI Technical Summary

Problems solved by technology

[0010] 1. Cement material repair method: 1) The maintenance time is long, and a large number of line maintenance personnel are occupied. Due to the long high-speed railway lines in my country and the large span of the work area, the line maintenance personnel can only maintain one position for a maintenance skylight, which takes up a large number of line maintenance personnel. Seriously affect the progress of other maintenance work; 2) It is easy to crack, and the cement material is greatly affected by environmental factors when it is cured to the maximum strength. Under the high-frequency disturbance of the train, the cured cement material often cracks; Falling off, causing secondary damage; 4) The strength of cement material is lower than that of reinforced concrete, and the problem of secondary damage due to insufficient strength is prone to occur after maintenance

[0011] 2. Epoxy resin mortar repair method: 1) The curing time of the material is long, and the curing time is greatly affected by the ambient temperature. The maintenance skylights of high-speed railways in my country are generally from 0:00 to 4:00 in the morning. The sunroof is solidified and demoulded; 2) The strength of epoxy resin mortar is low, and it is generally difficult to reach the strength of C60. After maintenance, it is prone to secondary damage due to insufficient strength; 3) The bonding strength and fatigue resistance impact strength of epoxy resin mortar It is not high enough to withstand the high-frequency vibration and lateral extrusion force brought by the track when the train passes, and it is easy to fall off; 4) The ballastless track is exposed to the outdoors for a long time, and the intensity of ultraviolet radiation is high. Generally, epoxy resin mortar does not add ultraviolet resistance and heat-resistant aging components, resulting in rapid attenuation of all aspects of performance and loss of function of the material under long-term ultraviolet radiation after maintenance

[0012] 3. The method of setting the line speed limit area: this method is only a temporary measure and cannot be used for a long time, let alone adopted on a large scale or across the entire line, otherwise it will directly affect the punctuality rate of the train and the train operation map, causing even greater problems

At present, commercially available concrete maintenance materials can only meet the maintenance needs of one location, that is, only one strength requirement, and it is difficult to meet the maintenance and multi-strength requirements of various locations; The time is less than 3 hours, and it is difficult for the current commercially available maintenance materials to produce the required strength within this time to ensure the traffic requirements; thirdly, the physical performance of commercially available concrete maintenance materials is low, and it is easy to appear under the condition of high-frequency dynamic load disturbance of the train. Cracking and falling off, thus threatening driving safety and forming secondary diseases; finally, due to long-term exposure of ballastless track concrete outdoors, strong ultraviolet radiation, general commercially available maintenance materials are difficult to withstand ultraviolet radiation, and the physical strength of materials accelerates under photoaging conditions. attenuation

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