Utilization of Coal Gangue Aggregate for Railway Roadbed Construction in Practice

Linhao Li, Guangcheng Long, Chaoneng Bai, Kunlin Ma, Meng Wang and Sheng Zhang
Additional contact information
Linhao Li: School of Civil Engineering, Central South University, Changsha 410075, China
Guangcheng Long: School of Civil Engineering, Central South University, Changsha 410075, China
Chaoneng Bai: Xi’an Railway Survey and Design Institute Co, Ltd., Xi’an 710054, China
Kunlin Ma: School of Civil Engineering, Central South University, Changsha 410075, China
Meng Wang: School of Civil Engineering, Liaoning Technical University, Fuxin 123000, China
Sheng Zhang: School of Civil Engineering, Central South University, Changsha 410075, China

Sustainability, 2020, vol. 12, issue 11, 1-20

Abstract: As a massive solid waste, the high value-added utilization of coal gangue has received more and more attention in China. This study focuses on the utilization of coal gangue aggregate in railway engineering for coal transportation passage. Coal gangue aggregate was employed as high-grade railway subgrade filler andprepared concrete for roadbed drainage (named coal gangue roadbed protecting concrete—CGRPC). First, the basic properties of coal gangue such as particle size distribution, ignition loss, strength change under water softening, and compression performance were measured. Then, the technology to use coal gangue as filler in railway subgrade was put forward based on a real engineering application with the Jingang coal-carrying railway special line. Field tests showed that the coal gangue roadbed had excellent performance. The dynamic stiffness expressed as K 30 was more 130 MPa/m, which meets the requirement for high-speed railway roadbeds. The distribution of vertical earth pressure according to the backfill depth showed a linear growing tendency. Finally, the technical and economic benefits of using coal gangue railway roadbeds were analyzed. The application of coal gangue near the railway line not only solved the problem of aggregate shortage in engineering construction, but it also consumes the coal gangue waste and leads to huge social benefits.

Keywords: coal gangue; railway subgrade filler; coal gangue concrete; application (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/2071-1050/12/11/4583/pdf (application/pdf)
https://www.mdpi.com/2071-1050/12/11/4583/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jsusta:v:12:y:2020:i:11:p:4583-:d:367133

Access Statistics for this article

Sustainability is currently edited by Ms. Alexandra Wu

More articles in Sustainability from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().