Conference Proceedings - 2021

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http://repository.vlu.edu.vn:443/handle/123456789/1422

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Browsing Conference Proceedings - 2021 by Subject ""Cement"
  • Publication
    Analyzing the usage of short cantilever reinforced concrete beam and applying strut and tie model in design calculation
    ( 2021)
    Nam H. Vu
    ;
    Trung T. Tran
    ;
    Xuan D. Tu
    Short cantilever beams appear in both civil and industrial projects such as bearing supports in assembled structures, connections between steel and concrete or heavy load-bearing components such as crane pillars, supporting bridge, etc. However, the distributed stress in the short cantilever reinforced concrete beam under concentrated load usually has a discontinuity zone and varies, which depend on the ratio between span length and height, making it difficult to calculate from the viewpoint as conventional beam. The strut and tie model has been studied by many authors, the application results have been recorded and included in the Euro code and ACI standards but the application to designers in civil engineering field is not efficient. Whenever designers need to design short cantilever beams, a difficult research must be done by designers, and it takes period to finish calculations. In this article, we discuss the usage of short cantilever reinforced concrete beams, apply strut and tie model to calculate this structure in accordance with ACI and Euro code standards and compare the calculation results to short cantilever reinforced concrete beams of TCVN 5574-2018 for an overview of these structural calculations in 3 different criteria. The article will be a practical reference source for designers and students to apply in real building design and reduce time in designing short cantilever beam
  • Publication
    Study of the heat generation due to the hydration of Portland cement using FLAC3D
    ( 2021)
    Van-Manh Nguyen
    ;
    Quang-Phich Nguyen
    ;
    Van-Duc Bui
    The hydration of cement is an exothermic reaction. The cement hydration reaction is a slow and long-time reaction. The hydration process can be divided into many different physical processes, of which mechanical and thermal processes are considered the most common. The analysis of temperature fields and thermal stresses in concrete structures is highly significant for preventing concrete from cracking. This paper presents the numerical simulation by using FLAC3D for hydration process in the concrete structures which includes heat hydration generation, heat propagation in concrete. it is possible to predict and control the amout of heat generated and their distribution in the concrete structures. In addition, it can be evaluated the dangerous level of the thermal stress and thermal deformation. These results can help the designer proposed the appropriate method for a construction process and concrete curing to achieve the best concrete quality according to the standard