Rubber elastic self-compaction concrete for plate-type ballastless tracks

Abstract

The invention relates to a rubber elastic self-compaction concrete for plate-type ballastless tracks, which is used for obviously enhancing the compression strength of the self-compaction concrete and enabling the self-compaction concrete to have favorable shock absorption and damping capacities. The rubber elastic self-compaction concrete for plate-type ballastless tracks can be used as a filler between the track plate and the bottom plate in a CRTS III plate-type ballastless track structure, and can also be used as a filler between a switch plate and the bottom plate in a switch structure. The self-compaction concrete is composed of the following components in parts by weight: 100 parts of cement, 4-10 parts of rubber powder, 30-60 parts of mineral admixture, 250-300 parts of fine aggregate, 250-300 parts of coarse aggregate, 1-2 parts of basalt fiber, 5-15 parts of expanding agent, 1.0-2.0 parts of water reducing agent, 0.01-0.05 part of rheologic assistant, 0.001 part of defoaming agent and 40-60 parts of water. The grain fineness of the rubber is 30-50 meshes, and the surface of the rubber is previously treated with polyvinyl alcohol and a silane coupling agent.

Description

technical field [0001] The invention relates to a slab ballastless track, in particular to a rubber-elastic self-compacting concrete used for a CRTSⅢ slab ballastless track, which can be used for the filler between the track slab and the bottom slab, and can also be used for the gap between the turnout slab and the bottom slab in the turnout structure. filler. 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, a considerable number of lines adopt slab-type 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 high-speed railways require extremely high Smoothne...

AI Technical Summary

Problems solved by technology

The material cost of CA mortar is about 10 times that of ordinary concrete, up to 4,000 yuan / square, and the price of each special mixer truck for CA mortar is high, reaching 3 to 5 million yuan / set. Special machines and tools are required for construction, and motors are required. , mixer and other tooling, and the construction speed is slow (the construction speed is only 300 meters per day for each working surface), the labor cost is high (about 30 people are required for one working surface), and the material and construction costs of a single line add up to 2 million / km, which makes the cost of using CA mortar higher

[0006] In addition, the field application results show that CA mortar still has a considerable degree of durability problems, among which water damage is one of the decisive factors. CA mortar has poor water resistance, and the softening coefficient is only about 0.5

Although ordinary self-compacting concrete has good water resistance, it is easy to segregate, float, and delaminate, and its vibration damping performance and impact resistance are poor. Under the impact of trains and alternating loads, the hardened concrete is easily broken. And debond from the track plate, from the seam