Self-compacting concrete mixture for plate-type ballastless track of railway

Abstract

The invention discloses a self-compacting concrete mixture for a plate-type ballastless track of a railway, which is composed of the following ingredients in part by weight: 100 parts of cement, 20-80 parts of mineral admixture, 200-300 parts of fine aggregate, 250-350 parts of coarse aggregate, 2-10 parts of parts of rubber powder, 1-3 parts of polypropylene fiber, 10-25 parts of expansion agent, 1.0-3.0 parts of water reducing agent, 0.1-1 part of retarder, 0.01-0.05 parts of rheology accessory agent, 0.001 part of antifoaming agent and 60-80 parts of water; and the self-compacting concretemixture is prepared by blending and stirring the materials. The self-compacting concrete mixture disclosed by the invention has the advantages of large flow state, self-compacting property, non-segregation, low shrinkage, high anti-cracking property and vibration adsorption, and the like, so that the self-compacting concrete mixture can be used as filler between a rail board and a soleplate in a plate-type ballastless track and can also be used as filler between a turnout board and the soleplate in a turnout structure.

Description

technical field [0001] The invention relates to a self-compacting concrete for a slab ballastless track of a high-speed railway, which can be used as a filler between a track slab and a bottom plate in a slab ballastless track structure, and can also be used as a filler between a turnout plate and a bottom plate in a turnout structure. Background technique [0002] In recent years, high-speed railways have developed by leaps and bounds all over the world, especially in my country. As of September 2011, 13,000 km of high-speed railways have been completed in my country. In the completed high-speed railway, quite a lot of lines adopt the slab ballastless track structure. In this type of track structure, the height of the track slab has been determined, and the error of the floor height is inevitable during construction. Because the high-speed railway requires extremely high Smoothness, so a filling layer is designed for later leveling and error elimination. At the same time, ...

AI Technical Summary

Problems solved by technology

Self-compacting concrete has the advantages of large fluidity, self-compacting, and low cost, and can meet the requirements of one-sided self-leveling in the construction of high-speed railway slab ballastless track. However, ordinary self-compacting concrete has the advantages of easy segregation, laitance, large shrinkage, and easy cracking Disadvantages, under the impact of trains and alternating loads, the hardened concrete is easy to debond from the track slab, and the concrete is prone to cracking. New self-compacting concrete with filler

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