Ben Gurion University of the Negev (BGU)

Transcription

1 Rethinking coastal defence and Green-energy Service infrastructures through enhanced-durability high-performance cement-based materials Ben Gurion University of the Negev (BGU) Alva Peled Structural Engineering Department Oren Regev Chemical Engineering Department

2 Ben Gurion University of the Negev (BGU) Founded in 1969 by government decision, in the vision of David Ben-Gurion, the first prime minister of Israel. In the desert Beer Sheva

3 Ben Gurion University of the Negev Close to 20,000 students on campuses in Beer-Sheva, Eilat and Sede Boqer #1 choice of Israeli undergraduate students 30-35% of student body in advanced degree programs 50% from Center & North of the country with a growing international student body 5

4 Pinchas Sapir Faculty of Humanities and Social Sciences 6 BGU Faculty of Natural Sciences Faculty of Engineering Sciences Faculty of Health Sciences Guilford Glazer Faculty of Business and Management Jacob Blaustein Institutes for Desert Research

5 Faculty of Engineering Sciences The largest of the University's five faculties, includes: 13 departments and units 170 faculty members and research workers ~ 5,500 students - toward bachelor, masters, and doctoral degrees.

6 2 PI s Alva Peled A full professor in the Department of Structural Engineering Research focus includes: Cement-based materials, cementitious composite materials, ultra-high performance concrete and nanofillers in cementitious materials. Oren Regev ( A full professor in the Department of Chemical Engineering Research focus includes: Nanocomposites polymer and cement-based with wide variety of nanofillers such as nanotubes and graphene. Production, exfoliation and dispersion of the nanofillers in various media to achieve enhanced mechanical and transport properties.

7 Main background of resesrch groups Nano-technology Textile Reinforced Concrete (TRC) Microstructural and chemical analysis in composite materials Sustainability developments Durability of cemetitious materials

8 BGU main objectives Development and design of innovative cement-based composite materials including the use of textiles and nano-technology approaches. Nano-particles dispersion. Alternative reinforcements other than steel textile made of polymer and carbon fibres. Mechanical testing, microstructural and chemical analysis. Controlled micro-cracking measured by non-distractive methods (acoustic emission) before and during loading at different aging and environmental conditions.

9 BGU Tasks leaders WP4 - Task Adaptation of UHDC to different application technologies (with UPV, PoliMi, TUD) WP5 - Task Feedback of durability performance and UHDCs design (with PoliMi, UPV, CSIC, TUD

10 WP4 main BGU (in close collaboration with UPV, PoliMi, TUD) Formulating UHDC (fine grain concrete)- Integration of NP and Textile Integrating carbon-based fillers : e.g., carbon nanotubes (CNT) and/or graphene (GNP), graphene oxide (GO) nanocomposite Total concentration CNT/GNP ratio Textile reinforcement carbon fabrics Matrix-fabric interface impregnation textile with fillers Combination of nanocomposite and impregnated textile

11 WP4 - Concept and Development of UHDC Main concept - NP+TRC 11

12 WP5 main BGU (in close collaboration with PoliMi, UPV, CSIC, TUD) Durability performance and UHDCs design Focused on corrosion of reinforcements and UHDC mix-designs under XA (chem. attack) conditions: Accelerated aging, acid attack tests, including volume changes, mass scaling, acid content, and leaching.

13 BGU available equipment BGU laboratories include: Scanning Electron Microscopy (SEM) equipped with Energy-Dispersive X-ray Spectroscopy (EDS). Transmission Electron Microscopy (TEM) and cryo-tem facilities (imaging of liquids) Raman spectroscopy of the graphene powder - used for differentiation between single-layer to few-layers-graphene (FLG) and graphite and measurement of defect density. Mechanical properties testing: closed loop uniaxial INSTRON (100 kn) and compression machine (2000 kn). Isothermal calorimeter (TAM Air) - chemical reaction of cementitious materials Acoustic emission (AE) - nondestructive test method to detect fracture processes. Results are achieved through detection, location and characterization of active AE sources within concrete such as micro- and macro-crack.

14 BGU Non-destructive acoustic emission testing prior and during loading to evaluate self-healing performance, durability and aging

15 Non-destructive acoustic emission testing Multiple Cracking Pull-Out First Crack

16 Participation in other WPs BGU will also participate in: WP2 :Project management WP8: Validation and proof of concepts in real-site durability conditions, as far as the verification of the UHDC application technologies and durability quantification is concerned through comparison with real monitored pilot performance. WP9: Dissemination and exploitation of results