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35 results on '"Zhang, Xiulong"'

11. Research and Development of Steel Fiber Reinforced Concrete Filling Material and Its Application in Gob-Side Entry Retaining Technology in Deep Mines.

Author

Zhang, Xiulong, Shi, Xinshuai, Li, Xuehui, Ning, Jianguo, Liu, Yuchi, and Yang, Shang

Subjects
FIBER-reinforced concrete, FILLER materials, MINES & mineral resources, SELF-consolidating concrete, STEEL, COAL mining
Abstract

Against the background of the prevailing green development paradigm, numerous coal mines have embraced the adoption of gob-side entry retaining mining technology. The most commonly employed form of gob-side entry retaining involves building an artificial wall along the edge of the goaf behind the working face to maintain the roadway. The pivotal challenge in gob-side entry retaining lies in the roadside support. Currently, commonplace concrete serves as the predominant material for the roadside filling body. Nevertheless, traditional concrete exhibits drawbacks, including inadequate tensile strength and poor toughness, leading to wall cracks or even collapses in the retaining wall. Steel fiber, a frequently employed reinforcement and toughening agent in concrete, has found widespread application in the construction sector and other fields. However, its use as a roadside filling material in underground coal mines remains infrequent. Therefore, in this paper, the flow and mechanical properties of steel fiber concrete were tested and analyzed, and field industrial tests were conducted. Results of indoor experiments show that steel fibers reduce the slump of concrete. The addition of steel fibers shifted the pore compacting stage, linear elasticity stage, and destabilization stage forward and improved the post-peak bearing capacity. The addition of steel fibers makes the concrete compressive and tensile strength show a "first increase and then decrease" trend; both peaked at 1.5%, and the increase in tensile strength is more pronounced. Steel fibers enhance the strength of compressive strength of concrete at an early age, weaker at a late age, and tensile strength inversely. The addition of steel fiber can change the concrete matrix from tensile damage to shear damage, and the toughness index shows the trend of "first increase and then decrease", and reaches the peak value when the dosage is 1.5%. Industrial test results show that steel fiber concrete as a roadside filling body can reduce the surrounding rock surface displacement and bolt (cable) force. [ABSTRACT FROM AUTHOR]

Published
2024
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29. Charge carriers at organic heterojunction interface: Exciplex emission or electroplex emission?

Author

Yang, Shengyi, Zhang, Xiulong, Hou, Yanbing, Deng, Zhenbo, and Xu, Xurong

Subjects
*ELECTROLUMINESCENCE, *SEMICONDUCTORS, *LUMINESCENCE, *ELECTROLUMINESCENT devices, *LIGHT
Abstract

We report the electroluminescence (EL) of organic heterojunction devices based on N,N′-diphenyl-N,N′-bis(3-methylphenyl)-(1,1′-biphenyl)-4,4′,-diamine (TPD) and 2-(4′-biphenyl)-5-(4″-tert-butylphenyl)-1,3,4-oxadiazole (PBD). Besides monomolecular emissions from TPD, there are two additional EL peaks at around 460 and 480 nm from the bilayer device indium tin oxide (ITO)/TPD(100 nm)/PBD(45 nm)/Al. Our experimental data confirmed that the EL emission maximized at around 460 nm is from electroplex as the result of charge carriers cross recombination at the TPD/PBD interface and the EL emission maximized at around 480 nm originates from (TPD*PBD)-type exciplex. [ABSTRACT FROM AUTHOR]

Published
2007
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