报告题目：Mechanism of sulfate attack on fly ash based geopolymer paste
地点：腾讯会议，会议号425 625 629
Geopolymer is a new type of low-carbon cementitious material, which is made of aluminosilicate material and activated by alkali solution. In the vast western region of China, soil and groundwater usually contain sulfates such as sodium sulfate and magnesium sulfate. Infrastructure buildings in these areas are at a risk of accelerated deterioration of concrete structures due to sulfate attack. Based on the background of environmental protection requirements for energy conservation and emission reduction and the widespread distribution of sulfate corrosion environment, it is necessary to investigate the erosion mechanism and mechanical properties of geopolymer concrete in sulfate environment. To address this issue, this presentation investigates mechanism of sulfate attack on fly ash based geopolymer paste by means of experimental analysis.
Dr. Tao LONG is a Postdoc in College of Civil and Transportation Engineering, Shenzhen University. His research focuses on durability and mechanical behavior of green concrete.
Dr. Tao LONG obtained his B. Eng and PhD in Civil Engineering from Sichuan University and joined Shenzhen University as a Postdoc in December 2019.
报告题目：Simulation for the cycling mechanical behaviour of plain concrete and ECC based on Lattice discrete particle model
地点：腾讯会议，会议号425 625 629
In order to apply the three-dimensional lattice discrete particle model for fiber reinforced concrete (LDPM-F) for predicting the mechanical behaviour of ECC (Engineered Cementitious Composites) under cyclic loading, the cycling constitutive model of concrete and fiber-bridge law were modified. The proposed constitutive model of concrete was firstly embedded into the finite element analysis software to simulate the mechanical behavior of concrete members under cycling tension-compression, hydro-static pressure and tri-axial compression in order to verified the effectiveness of this model. After that, combined the modified cycling model of concrete and fiber-bridge law, the cyclic tension behaviors of ECC and FRP grid reinforced ECC were simulated. The analytical results showed that the established cycling constitutive model can effectively simulate the stress strain relationships, the residual strain and the energy dissipation of concrete and ECC under different loading schemes. and their failure modes are consistent with the experimental results.
Dr. Zhongfeng Zhu is currently a graduate of the College of Transportation, Southeast University. He received his Ph.D in Department of Bridge Engineering from Southeast University. His research interests primarily include the application of composite materials in civil engineering, fiber reinforced concrete and lattice discrete particle model.