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Sökning: WFRF:(Zhang Qing Wen) > Teknik

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1.
  • Li, Lin jie, et al. (författare)
  • Chloride penetration in freeze–thaw induced cracking concrete: A numerical study
  • 2021
  • Ingår i: Construction and Building Materials. - : Elsevier BV. - 0950-0618. ; 302
  • Tidskriftsartikel (refereegranskat)abstract
    • Reinforced concrete (RC) structures, serving in marine and cold environments, are attacked by freeze–thaw cycles (FTCs) and chloride penetration, both of which can cause serious deterioration of RC structures. Existing studies lack of models considering the development of pore structure, as well as crack propagation caused by freeze and thaw. In this study, a multi-phase numerical model is proposed for studying chloride transport in concrete under FTCs. Unlike the existing models, the diffusion coefficient in the presented work is associated with the evolution of pore structure, and the induced crack is considered to be time-dependent and propagates with cycles of freeze–thaw action. The validity of the presented model is verified against a set of third-party experiments. Some important factors, such as FTCs, crack width, porosity, connectivity and most probable pore diameter factor are elaborated to illustrate how these factors affect chloride transport. The findings can bring insights to the durability design of RC structures serving in cold or marine regions.
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2.
  • Wang, Yi-Tong, et al. (författare)
  • Direct production of biodiesel via simultaneous esterification and transesterification of renewable oils using calcined blast furnace dust
  • 2021
  • Ingår i: Renewable energy. - : Elsevier BV. - 0960-1481 .- 1879-0682. ; 175, s. 1001-1011
  • Tidskriftsartikel (refereegranskat)abstract
    • Direct production of biodiesel by both esterification and transesterification of renewable oils with acid value (AV) of 9.6-28.9 mg KOH/g using calcined blast furnace dust is studied. Blast furnace dust calcined at 600-700 degrees C obviously promotes efficient biodiesel production because of the crystal form transformation from lead sulfate particles in dust into active lead oxide, lead sulfide, and lead particles. It is found for the first time that lead oxide, lead sulfide and lead particles can resist saponification from fatty acids to catalyze raw renewable oils to biodiesel with catalytic activity order as follows: lead oxide > lead > lead sulfide > lead sulfate. Biodiesel production process is optimized according to an orthogonal design with biodiesel yield of 92 wt% obtained at AV of 9.6 mg KOH/g (82 wt% after 5 cycles). Biodiesel yield of 84 wt% is achieved at AV of 28.9 mg KOH/g with acidity of 0.18 mmol/g. Calcined blast furnace dust presents potential applications in the production of biodiesel from renewable oils with high AVs.
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  • Resultat 1-2 av 2

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