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Effect of perlite powder on properties of structural lightweight concrete with perlite aggregate
Gongxing Yan,Mohammed Zuhear Al-Mulali,Amirhossein Madadi,Ibrahim Albaijan,H. Elhosiny Ali,H. Algarni,Binh Nguyen Le,Hamid Assilzadeh 국제구조공학회 2022 Structural Engineering and Mechanics, An Int'l Jou Vol.84 No.3
A high-performance reactive powder concrete (RPC) has been readied alongside river sand, with 1.25 mm particle size when under the condition of 80C steam curing. As a heat and sound insulation, expanded perlite aggregate (EPA) provides economic advantages in building. Concrete containing EPA is examined in terms of cement types (CEM II 32.5R and CEM I 42.5R), doses (0, 2%, 4% and 6%) as well as replacement rates in this research study. The compressive and density of concrete were used in the testing. At the end of the 28-day period, destructive and nondestructive tests were performed on cube specimens of 150 mm150 mm150 mm. The concrete density is not decreased with the addition of more perlite (from 45 to 60 percent), since the enlarged perlite has a very low barrier to crushing. To get a homogenous and fluid concrete mix, longer mixing times for all the mix components are necessary due to the higher amount of perlite. As a result, it is not suggested to use greater volumes of this aggregate in RPC. In the presence of de-icing salt, the lightweight RPC exhibits excellent freeze-thaw resistance (mass is less than 0.2 kg/m2). The addition of perlite strengthens the aggregate-matrix contact, but there is no apparent ITZ. An increased compressive strength was seen in concretes containing expanded perlite powder and steel fibers with good performance.
Optimization and mathematical modelling of multi-layer beam based on sinusoidal theory
Bin Wang,Gongxing Yan,Seyedmahmoodreza Allahyari 국제구조공학회 2021 Structural Engineering and Mechanics, An Int'l Jou Vol.79 No.1
The optimization conditions of the embedded nanocomposite multi-layer beams reinforced by ZnO nanoparticles are evaluated using a sinusoidal shear deformation theory. The adaptive improved harmony search (AIHS) optimization method is used as optimizer. Based on numerical method of differential quadrature, the buckling load is obtained. The optimum designs for nanocomposite reinforced sinusoidal multi-layer beams are evaluated using proposed AIHS based on the axial forces, applied voltage, volume fraction of ZnO nanoparticles, boundary conditions and geometrical parameters. The results demonstrated that optimum design conditions for a nanocomposite multi-layer beam under 50 GPa buckling constraint force are obtained as the length and thickness of multi-layer beam are 3.3326 m and 29.1125 cm. The applied voltage is the effective variables on the buckling of nanocomposite multi-layer beams.
Investigation of hyperbolic dynamic response in concrete pipes with two-phase flow
Zheng, Chuanzhang,Yan, Gongxing,Khadimallah, Mohamed Amiine,Nouri, Alireza Zamani,Behshad, Amir Techno-Press 2022 Advances in concrete construction Vol.13 No.5
The objective of this study is to simulate the two-phase flow in pipes with various two-fluid models and determinate the shear stress. A hyperbolic shear deformation theory is used for modelling of the pipe. Two-fluid models are solved by using the conservative shock capturing method. Energy relations are used for deriving the motion equations. When the initial conditions of problem satisfied the Kelvin Helmholtz instability conditions, the free-pressure two-fluid model could accurately predict discontinuities in the solution field. A numerical solution is applied for computing the shear stress. The two-pressure two-fluid model produces more numerical diffusion compared to the free-pressure two-fluid and single-pressure two-fluid models. Results show that with increasing the two-phase percent, the shear stress is reduced.
Xiaoping Zou,Gongxing Yan,Wangming Wu,Wenjie Yang,Weiwei Shi,Yuhusun Sun 국제구조공학회 2023 Steel and Composite Structures, An International J Vol.46 No.4
Bending static and stress investigation of a microplate of piezoelectric/piezomagnetic material subjected to combined multifield loading. Shear deformable as well as thickness stretched model is used for derivation of the kinematic relations. Multi field governing equations are derived analytically through principle of virtual work. the results are analytically obtained analytically including magnetic/electric potentials, displacement and stress components with variation in multifield loading parameters.