学术报告Infrastructure decarbonization: from energy-efficient concrete to clinkering-free cementation (基建脱碳：从高能效混凝土到碳化胶结)
报 告 人：
Abstract: While ordinary portland cement (OPC) has been used as the binding material in concrete for construction over the last century, its production is associated with approximately 5% of primary energy use and 8% of anthropogenic CO2 emissions globally. The tremendous environmental impact, along with deteriorating concrete structures around the world highlight the demand for sustainable and high-performance construction materials that can reduce the carbon footprint of traditional concrete and secure alternative solutions for cementation. In this talk, novel materials and processes are introduced to design advanced cementitious composites with improved performance, durability, and sustainability. First, functionalization of nanosilica spheres is applied to alter their surface charge and steric hindrance, so that they can stably disperse in cementitious environments to increase the extent and rate of hydration reactions for strength gain in high performance concrete. Second, the embedment of phase change materials (PCMs) in concrete as an effective means to improve crack resistance and thermal performance is demonstrated. A 1D transient thermal model is developed to predict temperature evolution in pavement and wall panel sections containing PCMs. Finally, a mineral carbonation route for clinkering-free cementation is introduced. This process creates new pathways for producing precast construction materials while enabling solid waste valorization and carbon storage.
Dr. Zhenhua Wei is a tenure-track assistant professor at SUSTech. He received his Ph.D. in civil engineering from UCLA in December 2017. Following his postdoctoral work (2018 – 2019) at Columbia University, he was the research director (2019-2021) of SPDLabs (a New York-based design company specializing in building-integrated photovoltaics) and later served as the administrator (2021) for the NSF IUCRC Center for Energy Harvesting Materials and Systems. Dr. Wei’s research interests lie broadly in characterizing, evaluating, and improving the durability and chemo-thermo-mechanical properties of construction materials with special focus on cementitious composites. He has worked on various research topics on the design, development and implementation of innovative materials and processes for sustainable infrastructure and energy systems including high performance concrete, smart phase-change wall panels and crack-resistant pavements, and CO2 mineralization and solid waste utilization for carbon-neutral construction.