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- 저자 : Chenxi Ding (검색결과 2 건)
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Mechanical Properties and Microstructure of Polypropylene Fiber Reinforced Cement Mortar Soil
Bo Ruan,Hui Ding,Jidong Teng,Wei Deng,Shilong Zheng,Chenxi Ruan 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.6
A series of unconfined compressive strength tests and flexural strength tests are carried out to evaluate the improved effect of polypropylene fiber on the defects of cement mortar soil. The following factors, including the fiber content, cement content, sand content and curing age, are studied to investigate the influences on the mechanical properties and microstructure of the samples. The results show that the unconfined compressive strength (UCS), residual strength and flexural strength of the fiber reinforced cement mortar soil (FRCMS) substantially increase with increasing fiber content. The peak strain and ratio of the flexural-compression strength (Rfcs) of the FRCMS first increase and then decrease with an increase in fiber content,and the optimal fiber content is 3.5%. The brittleness index of the FRCMS is found to be inversely proportional to fiber content. The results suggest that the addition of an appropriate amount of fibers can substantially improve the plasticity and lateral stress capacity of the FRCMS. The strength of the FRCMS improves with the increase in cement content, sand content and curing age within a certain range. The microstructure of the FRCMS are analyzedby scanning electron microscopy (SEM) tests.
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ZnFe2O4/Graphite Composite with High Performance as Anode Material for Lithium-Ion Batteries
Baolin Yao,Ziyue Wang,Chenxi Ding,Min Feng,Zhen Li,Yanqiu Huang 대한금속·재료학회 2023 ELECTRONIC MATERIALS LETTERS Vol.19 No.1
ZnFe 2 O 4 /graphite composite was synthesized by a thermal decomposition method using expanded graphite as matrix. TheZnFe 2 O 4 nanoparticles with the size of 20–30 nm were embedded into the interlayers of graphite. The porous structureformed by the graphite sheets can not only alleviate the adverse eff ects caused by the volume change of the ZnFe 2 O 4 duringcycling, but also improve the lithium storage performance. The specifi c capacity of 1450 mAh g − 1 is achieved after150 charge/discharge cycles at 0.1 A g − 1 . Moreover, the composite still delivers the specifi c capacity of 229 mAh g − 1 atthe ultrahigh current density of 10 A g − 1 after 1800 cycles, showing outstanding electrochemical performance and excellentcycling stability. The composite has great potential for use in the high-power lithium-ion batteries.
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