报告人：Dr. Hongyu Zhou, Assistant Professor, the University of Tennessee, Knoxville, USA
题目：Microstructure-guided design of functional cementitious materials for grid-interactive efficient buildings (GEB)
会议 ID：767 473 942 会议密码：2012
Micro- and nano-sized hollow and core-shell particles (CSPs) have attracted tremendous interests in developing functional cementitious composites and concretes. In this presentation, a microstructure guided approach is developed to predict thermal and elastic properties of cementitious composites containing core-shell and hollow micro-particles. The model follows a two-stage homogenization process – CSP inclusions together with their surrounding interfacial transition zone (ITZ) are first treated as equivalent solid particles, and then the homogenized properties of composite system is obtained using numerical (i.e., finite element) or analytical (Mori-Tanaka) approaches. The numerical model, validated by experimental results, is then used to elucidate the relationship between the effective thermal conductivity and effective elastic moduli for cementitious composites containing CSP additives with different shell materials, particle sizes, and volume concentrations etc. The results show that CSP particle size (or relative shell thickness), volume fraction, shell property, and the size of ITZ have significant impacts on the effective thermal and elastic properties of cementitious composites; whereas the particle size distribution pattern has relatively minor influence. Lastly, an application of this method is introduced to design cementitious composites containing large volume loading of phase change materials (PCM) for thermal energy storage (TES).
Prof. Hongyu Zhou is an Assistant Professor in Civil and Environmental Engineering at the University of Tennessee, Knoxville (UTK). Prior to joining UTK, he was an assistant professor at University of Alabama in Huntsville from 2014-2019. Dr. Zhou received his PhD in Civil Engineering from Arizona State University in 2013 and bachelor's degree in Civil Engineering from Tongji University in 2010. His research interests include adaptive and energy efficient buildings, emerging infrastructural materials, bioinspired design, and cyber-physical technologies for buildings and infrastructures. He has served PI/co-PI of projects over $2M funded by U.S. National Science Foundation (NSF), U.S. Department of Energy (DOE), Federal Highway Administration (FHWA) and Alabama Department of Transportation (ALDOT). Dr. Zhou is a member of the American Society of Civil Engineers (ASCE) and American Concrete Institute (ACI). He is a founding member and Chair for ASCE SEI Committee on Bioinspired Structures, co-chair of for the Advanced Structures and Materials Committee of ASCE Aerospace Division (ASD), and a member of the ASCE SEI Multi-Hazard Mitigation Committee, and a voting member of ACI Committees 122 – Energy Efficiency and 213 Lightweight Concrete.