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      저자 : Yongsheng Ji (검색결과 2 건)
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      • KCI등재

        Effect of Composite Modification of Nickel Slag Powder and Polypropylene Fiber on Mechanical Properties of MKPC Mortar

        Zhongzhe Zhang,Yongsheng Ji,Zhanguo Ma,Zhishan Xu,Furong Gao,Qi Xue 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.4

        In order to explore the influence of nickel slag powder (Ni) and polypropylene fiber (PP) on the performance of MPKC mortar, different mass fractions of Ni (5% − 20%) and different volume fractions (0.6% and 1.0%) of PP were added to MKPC. The composite modified MKPC (CM-MKPC) specimens were tested and analyzed for flexural strength, compressive strength, split tensile strength, and bending performance. With the help of scanning electron microscope, the microstructure and fracture morphology of the modified MKPC specimens for related research. The results show that the addition of PP and Ni improves the mechanical properties of MKPC and improves its flexibility and deformation properties. When the content of Ni and volume of PP are 15% and 1.0%, respectively, the mechanical properties and bending properties of the modified MKPC mortar are the largest in the same group. Ni added to the MKPC gel system can reduce the friction between irregular magnesium oxide particles and between aggregates. In this way, PP fiber can well enter into the aggregate and play a bridging role at the interface, so that MKPC can better play its mechanical properties.

      • KCI등재

        Effect of Polyacrylamide on Rheological Properties of Underwater Non-dispersible Paste of Alkali-Activated Slag

        Zhongzhe Zhang,Yongsheng Ji,Zhanguo Ma,Furong Gao,Mingming Ma,Zhishan Xu 대한토목학회 2022 KSCE Journal of Civil Engineering Vol.26 No.1

        In this paper, the rheological parameters of the alkali-activated slag underwater non-dispersible paste (AAS-UNDP) were tested, and the influence of polyacrylamide (PAM) on the rheological property of AAS-UNDP was studied combing with the method of molecular dynamics simulation. The experimental results show that the rheological model of AAS-UNDP and cement basted underwater non-dispersible paste (CB-UNDP) are consistent with the Herschel-Bulkley model. The results of molecular dynamics simulation show that the anions in PAM and the OH- alkali-activated slag cementitious material (AASCM) can produce repulsive force, so the potential energy of the AASCM is lower than the potential energy of the cement based cementitious material (CBCM).The mean square displacement (MSD) value and self-diffusion coefficient of PAM in the AASCM are higher than those of CBCM, indicating that the diffusion rate of particles in the AASCM is better than that of CBCM.

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