TRM and UHPFRC: Retrofitting solutions for structural elements

Author(s): A. Magri, M. Colombo, M. di Prisco
Paper category: Conference
Book title: Concrete Repair, Rehabilitation and Retrofitting III (ICCRRR)
Editor(s): M.G. Alexander, H.-D. Beushausen, F. Dehn, P. Moyo
Print ISBN: 978-0-415-89952-9
Publisher: Taylor & Francis Group
Pages: 460- 461
Total Pages: 2
Language: English

Strengthening of existing concrete structures is becoming one of the most important issue for structural engineering. This requirement comes from that old buildings often were not designed for earthquake loads. Traditional methods of seismic retrofitting follow two main principles: the request for an increase of strength and stiffness and/or the attempt of mass reduction. A good combination of high compressive and tensile strength can be obtain by using Textile Reinforced Mortar (TRM) and Ultra High Performance Fiber Reinforced Concrete (UHFRC). For studying the contribution in the post-crack behavior due to the retrofitting material, a new technique, Double Edge Wedge Splitting (DEWS), was adopted. The idea is to investigate the stress distribution on a repaired section of a notched original specimen loaded in pure tension. The uncoupling of tension and compression stress flows, that is the major advantage over bending and Brazilian tests of DEWS tests, is guaranteed by double notch of the specimen.
The experimental program included DEWS tests on traditional concrete slab (30 cm × 30 cm × 10 cm) strengthened with two possible retrofitting solutions: TRM reinforced with Alkali Resistant glass fabric and Ultra High Performance concrete reinforced with steel fibers. Before casting the repairing layers, the traditional concrete was pre-cracked reproducing a crack opening corresponding to uncracked, SLS and ULS crack opening.

Online publication: 2014
Publication Type: abstract_only
Public price (Euros): 0.00