Das Herbstsemester 2020 findet in einer gemischten Form aus Online- und Präsenzunterricht statt.
Bitte lesen Sie die publizierten Informationen zu den einzelnen Lehrveranstaltungen genau.

Pietro Lura: Katalogdaten im Herbstsemester 2017

NameHerr Prof. Dr. Pietro Lura
Adresse
EMPA
Überlandstrasse 129
8600 Dübendorf
SWITZERLAND
Telefon044 823 41 35
E-Maillurap@ethz.ch
DepartementBau, Umwelt und Geomatik
BeziehungTitularprofessor

NummerTitelECTSUmfangDozierende
101-0615-01LWerkstoffe III Belegung eingeschränkt - Details anzeigen 4 KP4PR. J. Flatt, I. Burgert, P. Lura, H. Richner, F. Wittel
KurzbeschreibungVermittlung von grundlegendem und praxisbezogenem Wissen über wichtige Baustoffe und Untersuchungsverfahren.
LernzielVermittlung von grundlegendem und praxisbezogenem Wissen über wichtige Baustoffe und Untersuchungsverfahren.
Inhalto Vorstellung der Materialprüfmaschinen und Durchführung verschiedener Prüfverfahren an metallischen Werkstoffen (Zugversuch, Härteprüfung, Biegeprüfung und Kerbschlagprüfung).
o Theoretische und praktische Behandlung von Aspekten der Betontechnologie wie: Mischungsentwurf, Herstellung , Einbau sowie Prüfung des Betons auf seine mechanischen Eigenschaften.
o Eigenschaften der Steine und Mörtel in einem Mauerwerk und deren Zusammenwirken. Parameter wie Druckfestigkeit, E-Modul, Wasseraufnahme, Wärmeleitfähigkeit von Mauerwerk werden vorgestellt sowie Hinweise zur konstruktiven Gestaltung gegeben.
o Besonderheiten des Werkstoffes Holz werden aufgezeigt: Anisotropie, Hygroskopizität, Schwinden und Quellen, Einfluss der Dimension auf die Festigkeitseigenschaften. Verschiedene Prüfmethoden an Holz werden erklärt und praktische Versuche durchgeführt.
o Die Grundlagen der Raster-Elektronenmikroskopie werden in praktischen Übungen mit dem ESEM (Atmosphärisches Raster-Elektronenmikroskop) vermittelt.
o Ein erster Einblick in die Grundlagen und Anwendung der Finite Elemente Methode wird in praktischen Übungen vermittelt.
o Die Thematik der Dauerhaftigkeit eines Bauwerks wird behandelt. Eingehend wird die Potentialmessung zur Detektierung und Ortung der Korrosion von Stahl in Beton theoretisch und praktisch behandelt.
SkriptZu jedem Thema wird ein Skript abgegeben. Download auf der Vorlesungsseite unter www.ifb.ethz.ch/education
101-0689-00LShrinkage and Cracking of Concrete: Mechanisms and Impact on Durability3 KP2VP. Lura, M. Wyrzykowski
KurzbeschreibungConcrete is generally viewed as a durable construction material. However, the long-term performance of a concrete structure can be greatly compromised by early-age cracking. This course will explain how shrinkage of concrete leads to cracking and how control of shrinkage allows increasing the expected durability of a concrete structure.
LernzielThis course will begin with a brief introduction about hydration and microstructure development in cement paste and concrete. The students will learn the main causes of cracking at early ages, namely plastic, drying, thermal and autogenous shrinkage, with special emphasis on the driving mechanisms. The importance of concrete curing, especially in the first few days after casting, will be stressed and explained. Building on the knowledge of the driving forces of shrinkage, the way of action of shrinkage-reducing admixtures will be clarified and different applications illustrated. As an extension of external curing, the students will become familiar with internal water curing by means of saturated lightweight aggregates and superabsorbent polymers.
Most concrete members are restrained by adjacent structures. When shrinkage is restrained, cracks may develop. The students will learn how to apply different criteria for assessing concrete cracking and how to retrieve the mechanical properties of the concrete, especially stiffness and creep, relevant for the calculations.
In addition to macroscopic cracks, microcracking may occur in the cement paste due to inner restraint offered by the aggregates. Both macroscopic cracks and diffuse microcracking within a concrete may facilitate the ingress of harmful substances (e.g. chloride and sulfate ions) into the concrete; these may react with the concrete or with the reinforcement and create further deterioration. The students will acquire an understanding of the mechanisms of transport through cracked concrete, with special focus on experimental evidence and on techniques able to visualize the transport process and follow it in time.
As a final outcome of the course, the students will be able to estimate the impact of cracking on the expected durability of concrete structures and to implement different types of measures to reduce the extent of cracking.
InhaltConcrete is generally viewed as a long-lasting construction material. However, the durability of a concrete structure can be jeopardized by shrinkage-induced cracking. In addition to being unsightly, cracks have the potential to act as weak planes for further distress or as conduits for accelerated ingress of aggressive agents that may reduce durability.
Advances in concrete technology over the past decades have led to the practical use of concrete with a low water to binder ratio and with different types of mineral and organic admixtures. Another recent development is self-compacting concrete, which avoids concrete vibration and reduces labor during placing. Unfortunately, these concretes are especially prone to cracking at an early age, unless special precautions are taken. Proper curing becomes in this case the key to achieve better performance in various environmental and load conditions.
Specific topics covered by the course:
- Hydration and microstructure development
- Plastic shrinkage
- Development of mechanical properties
- Thermal deformation
- Autogenous deformation
- Drying shrinkage
- Creep and relaxation
- Curing
- Shrinkage-reducing admixtures
- Internal curing: saturated lightweight aggregates and superabsorbent polymers
- Fracture and microcracking
- Transport in cracked concrete
- Impact of cracking on concrete durability
- Self-healing of cracks
SkriptFor each lecture, lecture notes will be provided. In addition, one or two research papers for each lecture will be indicated as supportive information.
LiteraturCopies of one to two research papers relevant to the topic of each lecture will be provided to the students as supportive information.
Voraussetzungen / BesonderesA basic knowledge of concrete technology is preferable.