A quick repair material for joints between slabs of crts Ⅱ slab ballastless track

Abstract

The invention relates to a rapid repairing material of a seam between CRTS II shaping plate ballastless track boards. The material comprises, by mass, 100 parts of cement, 16-48 parts of fly ash, 3-9 parts of ultrafine slag powder, 1-3 parts of silica fume, 40-110 parts of fine aggregates, 6-12 parts of a slight expansion component, 1-8 parts of a polymerization bonding component, 1-10 parts of a modulus adjusting component, 0.01-2 parts of a powder antifoaming agent, 0.5-5 parts of a hardening acceleration component and 0.2-1 part of a water reduction component. The material has the characteristics of simple workability, high bonding strength, high strength, rapid setting, low modulus and high durability, is suitable for rapidly repairing the seam between CRTS II shaping plate ballastless track boards, and is also suitable for rapidly repairing other similar structures.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a repair material preparation technology with simple construction performance, high bonding strength, high strength and fast hardening, low modulus and high durability, which is suitable for CRTS II type ballastless track track slab indirect The quick repair of seams is also suitable for quick repair of other similar structures. Background technique [0002] With the rapid development of my country's high-speed railway network construction, CRTS II ballastless track structure has become an important track structure type used in my country's high-speed railway construction. In the CRTS II ballastless track structure, the wide joint concrete is poured between the track slabs on both sides, which is micro-expansion concrete, which limits the longitudinal movement of the track slab and prevents rainwater from corroding the longitudinal connecting steel bars. The track s...

AI Technical Summary

Problems solved by technology

At the same time, due to the unique longitudinal slab structure of the CRTS II slab ballastless track, which is a rigid structure, the wide joint concrete and the track slab concrete are both C55 high-strength concrete, and the concrete modulus is high. When the temperature rises, it is easy to The joints between wide joint concrete and track slab concrete generate greater stress, resulting in damage to wide joints, especially track slab concrete

At present, the concrete repair materials on the market are prone to cracking, the early strength cannot meet the requirements, and additional conditions such as covering curing or steam curing are required, and the problems of high early strength and high modulus of high-strength concrete repair materials cannot be solved. Ballast track track slab indirect joint damage repair technical requirements, not to mention the durability of concrete in exposed environments

In the existing technology, most of the research is on the repair of concrete roads, which have the disadvantages of easy cracking and unsatisfactory early strength, and there is no repair material specially for the rapid repair of joints between slabs of CRTS II slab ballastless track

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