Mortar for quickly repairing filling layer of slab ballastless track, and preparation method and use method of mortar

Abstract

The invention provides mortar for quickly repairing a filling layer of a slab ballastless track, and a preparation method and a use method of the mortar. The mortar for quickly repairing the filling layer of the slab ballastless track comprises the following raw materials in parts by mass: 0.95-0.99 parts of cement, 0.01-0.05 parts of an admixture, 0.35-1.4 parts of polymer emulsion, 1.5-2 parts of sand, 0-0.3 parts of water, 0.0004-0.01 parts of a defoaming agent, 0.0001-0.003 parts of a foaming agent, 0.0005-0.01 parts of an air-entraining agent, 0.001-0.005 parts of a thickening time control agent, 0-0.02 parts of a water reducing agent and 0-0.001 parts of a rheology modifier, wherein the cement is quick-hardening sulphoaluminate cement. The mortar can meet requirements of construction at different temperatures, and is high in hour strength and high in flowability; filling is full; the mortar is homogeneous and free from layering, segregation and bleeding; the mechanical properties and the durability are matched with the mortar of the original filling layer; in addition, a construction process is simple; the cost is low; and sources of the raw materials are not limited.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a rapid repair mortar for a filling layer of a plate-type ballastless track and a preparation method and a use method thereof. Background technique [0002] The slab ballastless track is one of the main structural forms of the ballastless track of the high-speed railway. It is characterized by laying a concrete base on the subgrade, placing a prefabricated track slab on the base, leaving a gap of 3~5cm between the two, and pouring cement Emulsified asphalt mortar, after curing, forms a uniform filling cushion with both rigidity and elasticity. In the slab ballastless track structure, compared with the high-strength concrete track slab and concrete base, the cement emulsified asphalt mortar as the filling layer becomes the weak link in the structure. In recent years, slab ballastless track has been used in large-scale projects in my country. With the passage of opera...

AI Technical Summary

Problems solved by technology

[0003] The existing technology has achieved a good repair effect on the corner damage and small gaps of the mortar, but the material price is relatively high

In addition, there are no corresponding emergency repair materials for the large gaps between several or dozens of slabs and mortar caused by subgrade settlement or emergencies that require filling layer mortar to be poured again and resume traffic operation as soon as possible.

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