Road performance analysis of cement stabilized coal gangue mixture

Zhenxia Li; Tengteng Guo; Yuanzhao Chen; Xu Zhao; Yanyan Chen; Xiao Yang; Jing Wang

doi:10.1088/2053-1591/ac3e97

Materials Research Express (Jan 2021)

Road performance analysis of cement stabilized coal gangue mixture

Zhenxia Li,
Tengteng Guo,
Yuanzhao Chen,
Xu Zhao,
Yanyan Chen,
Xiao Yang,
Jing Wang

Affiliations

Zhenxia Li: School of Civil Engineering and Communication, North China University of Water Resources and Electric Power , Zhengzhou 450045, Henan, People’s Republic of China; Henan Province Engineering Technology Research Center of Environment Friendly and High Performance Pavement Materials, Zhengzhou 450045, Henan, People’s Republic of China; Zhengzhou City Key Laboratory of Environmentally Friendly High Performance Road and Bridge Materials, Zhengzhou 450045, Henan, People’s Republic of China
Tengteng Guo: School of Civil Engineering and Communication, North China University of Water Resources and Electric Power , Zhengzhou 450045, Henan, People’s Republic of China; Henan Province Engineering Technology Research Center of Environment Friendly and High Performance Pavement Materials, Zhengzhou 450045, Henan, People’s Republic of China; Zhengzhou City Key Laboratory of Environmentally Friendly High Performance Road and Bridge Materials, Zhengzhou 450045, Henan, People’s Republic of China
Yuanzhao Chen: ORCiD; School of Civil Engineering and Communication, North China University of Water Resources and Electric Power , Zhengzhou 450045, Henan, People’s Republic of China; Henan Province Engineering Technology Research Center of Environment Friendly and High Performance Pavement Materials, Zhengzhou 450045, Henan, People’s Republic of China; Zhengzhou City Key Laboratory of Environmentally Friendly High Performance Road and Bridge Materials, Zhengzhou 450045, Henan, People’s Republic of China
Xu Zhao: School of Civil Engineering and Communication, North China University of Water Resources and Electric Power , Zhengzhou 450045, Henan, People’s Republic of China
Yanyan Chen: School of Civil Engineering and Communication, North China University of Water Resources and Electric Power , Zhengzhou 450045, Henan, People’s Republic of China
Xiao Yang: School of Civil Engineering and Communication, North China University of Water Resources and Electric Power , Zhengzhou 450045, Henan, People’s Republic of China
Jing Wang: School of Civil Engineering and Communication, North China University of Water Resources and Electric Power , Zhengzhou 450045, Henan, People’s Republic of China

DOI: https://doi.org/10.1088/2053-1591/ac3e97
Journal volume & issue: Vol. 8, no. 12
p. 125502

Abstract

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In order to solve the environmental pollution of coal gangue and the shortage of aggregate resources in road engineering, waste coal gangue is used as road base material instead of natural stone materials. Through physical, mechanical, chemical and activity tests of coal gangue aggregate, the optimal gradation composition of unconfined compressive strength was determined. Through unconfined compressive strength, indirect tensile strength, flexural tensile strength, freeze-thaw and dry shrinkage tests, the influence of cement content on road performance of cement stabilized coal gangue mixture was studied. By means of SEM, ICP AES, XRD and optical digital microscope, the difference between spontaneous combustion coal gangue and Unspontaneous combustion coal gangue was analyzed, the microstructure of cement stabilized coal gangue mixture was characterized, and the strength formation mechanism of mixture was explored. The results show that Spontaneous combustion coal gangue has higher activity than Unspontaneous combustion coal gangue. Based on the selected optimal allocation (BNS:SNS:SSC = 71.26:9.41:18.8). The mixture of 4% cement dosage can not only meet the requirement of early strength 4.16 MPa, but also show an efficient strength growth rate of 36.10%, showing the optimum mechanical properties. The total shrinkage coefficient of cement stabilized coal gangue mixture with 4% cement dosage is 1.12 × 10 ^−2 , which shows that the dry shrinkage resistance is the best. With the increase of time, hydration degree is gradually deepened, and gelled substance is more tightly bonded to aggregates. There is no obvious gap between aggregates, and the integrity of the mixture is enhanced, which can show better road performance. Ca (OH) _2 , a cement hydration product in cement stabilized coal gangue mixture, takes place pozzolana reaction with active SiO _2 and Al _2 O _3 in coal gangue to produce gismondine, which is beneficial to the global strength and the bond quality of the mixture.

Published in Materials Research Express

ISSN: 2053-1591 (Online)
Publisher: IOP Publishing
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials; Technology: Chemical technology
Website: https://iopscience.iop.org/journal/2053-1591

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