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Title:

Study on the Measures to Improve the Durability of Chinese CRTS Ⅰ Slab Track
Cover of Study on the Measures to Improve the Durability of Chinese CRTS Ⅰ Slab Track

Accession Number:

01556707

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States

Abstract:

China has built the world’s largest high-speed railway network with the ballastless track. CRTS Ⅰ slab track runs well and the expected purposes of high ride comfort, high stability, low maintenance were achieved. However, worldwide experience of ballastless track shows that defects and deterioration were inevitable. At present, there is a lack of the systematic research for the durability of ballastless track in China. In this paper, on the basis of summarizing the structural characteristics of CRTS (Chinese Railway Track System) Ⅰ slab track, combined with the field application of slab track, the typical damages and its influencing factors were discussed. Damages include: (a) anchor point cracks and bars fracture of prestressed slab, (b) convex block cracks of slab track at the large-span bridge end, (c) cracks between cement asphalt mortar layer and slab, (d) mud pumping of surface layer of subgrade bed, and (e) poor drainage of prestressed concrete frame slab track. Additionally, for enhancing the durability of CRTS Ⅰ slab track, measures based on material, design, construction and operational maintenance were proposed. Enhancing measures include: (a) improving the requirements of material performance for prestressed steel bars, (b) drawing up water resistance indicator of cement asphalt mortar, and adopting sealant material with high flexibility and anti-aging performance, (c) using pretensioned prestressed slab, optimizing drainage system, setting rail expansion joint reasonably on large span bridge, (d) optimizing pouring technology of cement asphalt mortar, (e) improving the construction accuracy of drainage slope of concrete base bed, and (f) filling in cracks timely.

Supplemental Notes:

This paper was sponsored by TRB committee AR050 Railroad Track Structure System Design.

Monograph Accession #:

01550057

Report/Paper Numbers:

15-1322

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Lin, Hongsong
Yan, Hua

Pagination:

13p

Publication Date:

2015

Conference:

Transportation Research Board 94th Annual Meeting

Location: Washington DC, United States
Date: 2015-1-11 to 2015-1-15
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

Figures; Photos; References

Geographic Terms:

China

Subject Areas:

Construction; Design; Maintenance and Preservation; Railroads; Terminals and Facilities; I22: Design of Pavements, Railways and Guideways; I50: Construction and Supervision of Construction; I60: Maintenance

Source Data:

Transportation Research Board Annual Meeting 2015 Paper #15-1322

Files:

PRP, TRIS, TRB, ATRI

Created Date:

Dec 30 2014 12:31PM