Anchor sealing mortar and preparation method thereof

Abstract

The invention discloses anchor sealing mortar and a preparation method thereof, and the anchor sealing mortar is prepared from the following raw materials in parts by weight: 40.0 to 50.0 parts of cement, 30.0 to 40.0 parts of fine aggregate, 4.0 to 10.0 parts of carbon nanotube modified mineral admixture, 1.0 to 3.0 parts of water reducing agent, 0.5 to 1.0 part of viscosity modifier, 0 to 1.5 parts of retarder, 0 to 1.0 part of early strength accelerator, 1.0 to 2.0 parts of shrinkage reducing agent, 8.0 to 11.0 parts of a single-component water-cured polyurethane waterproof coating, and 5.0 to 12.0 parts of water. The anchor sealing mortar provided by the invention is good in workability, high in strength, good in compactness, excellent in waterproofness and impermeability, good in cohesiveness with an anchor hole and proper in toughness, and can still be tightly bonded when an anchor recess of a track plate is chemically deformed, the carbon nanotube modified admixture is added, so that a cathode protection effect can be achieved on reinforcing steel bars in the anchor recess, the corrosion resistance is more excellent, meanwhile, the extrudability is good, and construction surface finishing is easy.

Description

technical field [0001] The invention belongs to the technical field of construction engineering, and relates to an anchor mortar and a preparation method thereof, in particular to an anchor mortar for anchoring prestressed steel bar anchor holes in the manufacturing process of prestressed track slabs and prestressed sleepers and its Preparation. Background technique [0002] In recent years, high-speed railways have vigorously developed a new type of ballastless track with concrete or asphalt mixture as the main material to replace the traditional ballasted track bed. Ballastless track gradually replaced the ballasted track bed due to its advantages of strong integrity, good stability, long service life, low noise, small dust, beautifying the environment, and easy maintenance, and has been widely used in high-speed railways. [0003] In the construction process of ballastless prestressed track or prestressed sleeper, it is necessary to use anchor mortar to seal the anchor h...

AI Technical Summary

Problems solved by technology

[0003] In the construction process of ballastless prestressed track or prestressed sleeper, it is necessary to use anchor mortar to seal the anchor hole of prestressed steel bar. The quality of anchor mortar directly affects the durability of track slab and sleeper. If the anchor mortar cracks or It will fall off and break due to poor combination with the concrete around the anchor hole, which will corrode the prestressed tendons of the track slab and seriously affect its durability

[0004] In the prior art, the mortar is mostly prepared with or without mineral admixtures, and conventional mineral admixtures such as fly ash and slag are usually added to prepare the mortar, but the mortar prepared in this way Overall performance is not ideal

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