Plate type ballastless track self-compacting concrete additive

Abstract

The invention provides a plate type ballastless track self-compacting concrete additive. By means of the plate type ballastless track self-compacting concrete additive, the segregation prevention capacity of self-compacting concrete can be improved, the shrinkage of the concrete can be reduced, and industrial waste or by-products can be utilized to the maximum extent. The plate type ballastless track self-compacting concrete additive is composed of, by weight, 100 parts of sulfur-fixed ash, 20 parts to 50 parts of coal ash, 10 parts to 30 parts of silica fume, 10 parts to 20 parts of slag powder, 0.5 part to 1 part of water reducing agents and 0.1 part to 0.5 part of triisopropanolamine. The plate type ballastless track self-compacting concrete additive accounting for 10wt% to 25wt% of cement is mixed into the self-compacting concrete.

Description

technical field [0001] The invention relates to a slab ballastless track, in particular to a self-compacting concrete additive for a CRTSⅢ slab ballastless track. Background technique [0002] In recent years, high-speed railways have developed by leaps and bounds all over the world, especially in China. By the end of 2013, China had completed and operated 11,000 kilometers of high-speed railways, and 13,000 kilometers of high-speed railways were under construction. In these high-speed railways, quite a few lines adopt slab ballastless track structure. At present, there are three main types of slab ballastless tracks in China, namely CRTS (China Railway Track System) Ⅰ, Ⅱ, and Ⅲ type. Floor, subgrade (bridge deck). [0003] Among them, CRTS Ⅰ type slab ballastless track is filled with CA mortar (Cement and emulsified asphalt mortar) with low elastic modulus, while CRTS Ⅱ type is filled with CA mortar with high elastic modulus. The CRTSⅢ slab ballastless track is a track s...

AI Technical Summary

Problems solved by technology

[0004] Compared with CA mortar, self-compacting concrete has the advantages of less difficulty in construction, low cost, good water resistance and durability, but because self-compacting concrete achieves the effect of large flow state, it often adopts a higher water-cement ratio, which leads to It is easy to segregate, float, and delaminate, and the drying shrinkage of hardened concrete is relatively large. Under the impact of trains and alternating loads, the concrete is easy to crack, and it will be debonded and separated from the track slab