报告题目：Application of Raman spectroscopy to construction material: concrete and steel reinforcement
报告人：Mi Tangwei 博士
地点：腾讯会议，会议号357 969 052
Deterioration of the concrete and the steel reinforcement are the main durability issues for the steel reinforced concrete structure around the world. To investigate the underlying mechanism of those issues, extensive techniques have been employed, such as SEM, XPS and TEM. However, it is still a challenge to fully understand the deterioration mechanism due to the lack of the reliable in-situ experimental data, especially for the change of composition. Raman spectroscopy, a backscattering base technology, has been considered as a possible alternative benefiting from its simple sample preparation and ease to achieve in-situ tests. Additionally, it has been approved that all the deterioration products of concrete and steel reinforcement can be clearly distinguished and identified by the Raman spectroscopy. This presentation will thereby demonstrate the feasibility of using the Raman spectroscopy to investigate the deterioration of steel reinforced concrete structures and possible future application to the construction material.
Dr. Mi is PhD student from Department of Civil, Environmental and Geomatic Engineering, University College London. His research investigates the application of Raman spectroscopy to the construction material.
Dr. Mi holds an MSc from Dundee University. He is currently a final year PhD student in University College London and about to graduate in this summer.
报告题目：Carbonation Treatment of Recycled Concrete Aggregates: from Mechanism to Performance
地点：腾讯会议，会议号357 969 052
Old cement mortars attached on the surface of recycled concrete aggregates (RCA) could seriously weaken the mechanical performance and durability of the recycled aggregate concrete (RAC). Treatment by accelerated carbonation has been widely studied to enhance the quality of recycled concrete aggregates (RCA) and hence the performance of new concrete produced with the RCA. This is often ascribed to the densification of RCA. However, it is still a challenge to fully understand the link between the modification of local features of carbonated cement pastes in RCA and the engineering performance of new concrete. And thus, the author investigated the influence of carbonation treatment of RCA on the interface between the carbonated RCA and new cement mortar/paste by identifying the interfacial bonding strength and microstructural characteristics. This presentation will thereby demonstrate the intrinsic linkage of the improved performance of RAC with the modified microstructural features of RCA at multiple scales induced by the carbonation treatment.
Dr. Zhan Baojian is currently an assistant professor of the College of Civil and Transportation Engineering, just newly joined SZU in May 2020. He received his B.Eng and M. Eng in Material Science from Wuhan University of Technology, Wuhan, China and his Ph.D in Civil Engineering from the Hong Kong Polytechnic University.
His research interests primarily include characterization and re-utilization of industrial by-products and solid wastes, design and testing of cement-based composites, and development of low-carbon building materials.