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Elastic concrete for embedded track and preparation method of elastic concrete
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An elastic concrete and embedded track technology, applied in the track field, can solve the problems of high cost and low construction efficiency, and achieve the effects of low material cost, strong bonding performance, and improved physical and mechanical properties and heat resistance.
Active Publication Date: 2018-05-18
CHENGDU XINZHU ROAD & BRIDGE MASCH CO LTD
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However, the use of pure polyurethane polymer materials as castables and the bonding of polymer materials with rails and bearing grooves also require interface agents, which have the disadvantages of high cost and low construction efficiency.
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Embodiment 1
[0018] An elastic concrete for embedded rails, including three components A, B and C. Among them, component A is polyurethane prepolymer, component B is curing agent with modifier added, and component C is Basalt or limestone of 4-20 mesh, the weight ratio of component A, component B and component C is 100:20-60:450-600.
[0022] A method for preparing elastic concrete for embedded rails includes the following steps:
[0023] (1) Add polyether polyol into the reactor, stir, heat up to 105℃~110℃, vacuum dehydration for 1.5~3h, cool down to 70℃~80℃, add isocyanate and filler, slowly heat up to 80℃~90℃ After a constant temperature reaction for 3h-4h, vacuum degassing for 30min, the isocyanate-terminated prepolymer is prepared, and the temperature is cooled down to prepare material A for use;
[0025] (3) When using on-site, weigh A, B and C accurately in proportion. First add B to A and stir for 2 to 3 minutes with a stirrer, then add C to mix and mix evenly, and pour into the pouring A...
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Abstract
The invention discloses elastic concrete for an embedded track. The elastic concrete is prepared from a component A, a component B and a component C, wherein the component A is a polyurethaneprepolymer, the component is a curing agent with a modifier added, the component C is a basalt or limestone stone material of 4-20 meshes, and the weight ratio of the component A, the component B and the component C is 100:(20-60):(450-600); the component A comprises polyether polyol, isocyanate and a filler; the component B comprises petroleumasphalt, 4,4-diamino-3,3-dichlorophenyl methane, a coupling agent, a defoaming agent, a mildew preventive, an antioxidant 1010, an ultraviolet absorber UV-327, a catalyst and a plasticizer. Polyurethane is modified through a reaction of reactive hydrogen and isocyanate radicals in the petroleumasphalt, so that polyurethane has the toughness of long carbon chains and keeps higher adhesion performance, and the hardness of the concrete is improved through compounding with the stone material.
Description
Technical field [0001] The invention relates to an elastic concrete used for an embedded track and a preparation method thereof, and belongs to the technical field of track. Background technique [0002] As a new type of ballastless track system, the embedded track system has changed the traditional ballastless track using fasteners to discretely support and fix the rails. The rail system is made by pouring polymercomposite material into the rail groove, and coating the rail after curing, which can replace traditional fasteners to continuously support and fix the rail. However, the use of pure polyurethanepolymer materials as castables and the bonding of the polymer materials with the steel rail and the rail groove also requires interface agents, which have the disadvantages of high cost and low construction efficiency. Summary of the invention [0003] The purpose of the present invention is to provide an elastic concrete for embedded tracks and a preparation method thereof in...
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