Self-compacting concrete for high-speed railway turnout area slab ballastless track filling layer

Abstract

The invention relates to concrete, in particular to self-compacting concrete for a high-speed railway turnout area slab ballastless track filling layer, and solves the problem that the conventional self-compacting concrete in the high-speed railway turnout area slab ballastless track filling layer cannot meet the design requirement. The self-compacting concrete for the high-speed railway turnout area slab ballastless track filling layer is prepared from the following raw materials in part by weight: 330 to 335 parts of cement, 195 to 200 parts of class I fly ash, 70 to 75 parts of expanding agent, 805 to 808 parts of medium sand, 355 to 360 parts of continuously graded broken stone with the particle size of 5 to 10mm, 355 to 360 parts of continuously graded broken stone with the particle size of 5 to 16mm, 180 to 185 parts of water, 7.5 to 8.0 parts of polycarboxylic acid water reducing agent and 6.0 to 6.5 parts of anti-cracking agent. The self-compacting concrete has a good filling effect and can be widely suitable for filling the high-speed railway turnout area slab ballastless track filling layer.

Description

technical field [0001] The invention relates to concrete, in particular to self-compacting concrete used for filling layers of slab-type ballastless tracks in high-speed railway turnout areas. Background technique [0002] Self-compacting concrete is a new type of concrete. The basic principle of preparation is to reduce the yield stress of the concrete mixture to an appropriate range through the compounding of admixtures, the selection and matching of high-quality admixtures, and coarse and fine aggregates. The material has high fluidity, can fill the model by self-leveling, and does not bleed, does not segregate, and has uniform quality after molding. Self-compacting concrete is vibration-free, which can save labor and electricity, improve work efficiency, avoid the harm caused by the noise generated by vibration to the environment, and can solve some traditional concrete construction leakage vibration, over-vibration and dense steel bar pouring vibration It can also prot...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the existing self-compacting concrete cannot meet the design requirements in the filling layer of the slab-type ballastless track in the high-speed railway branch area, the present invention provides a self-compacting concrete for the filling layer of the slab-type ballastless track in the high-speed railway branch area

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