A kind of anchor sealing mortar and preparation method thereof

Abstract

The invention discloses an anchor sealing mortar and a preparation method thereof. The anchor sealing mortar comprises the following raw materials in parts by weight: 40.0-50.0 parts of cement, 30.0-40.0 parts of fine aggregate, and 4.0 parts of carbon nanotube modified mineral admixture ‑10.0 parts, 1.0‑3.0 parts of water reducing agent, 0.5‑1.0 parts of viscosity modifier, 0‑1.5 parts of setting retarder, 0‑1.0 parts of early strength coagulant, 1.0‑2.0 parts of shrinkage reducing agent, one-component water 8.0-11.0 parts of cured polyurethane waterproof coating, 5.0-12.0 parts of water; the anchor sealing mortar provided by the invention has good workability, high strength, good compactness, excellent waterproof and impermeability, good adhesion with anchor holes, and suitable Toughness, when the anchor hole of the track plate is chemically deformed, it can still be tightly bonded. Adding carbon nanotube modified admixture can play a cathodic protection effect on the steel bars in the anchor hole, with better corrosion resistance and good extrudability , easy to construct and finish.

Description

technical field [0001] The invention belongs to the technical field of construction engineering, and relates to an anchor sealing mortar and a preparation method thereof, in particular to an anchor sealing mortar for sealing anchorage of prestressed steel bar anchor holes during the manufacturing process of prestressed track slabs and prestressed sleepers and the same Preparation. Background technique [0002] In recent years, high-speed railways have vigorously developed new ballastless tracks with concrete or asphalt mixture as the main material to replace the traditional ballast bed. Ballastless track has gradually replaced the ballast track bed due to its advantages of strong integrity, good stability, long service life, low noise, low dust, beautifying the environment, and good 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 seal the prestresse...

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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