How did the research turn out? What were the findings? Researchers themselves report briefly on the research they have undertaken with funding support from the Formas Research Council.
Editor: Margaretha Nordahl
Restoration of brickwork facades damaged by corrosion
Miklós Molnár (project leader)
Summary of results from Building and Environmental Technology, Lund University of Technology.
Email: miklos.molnar@kstr.lth.se.
Bibliography: Gustavsson, Jönsson, Molnár “Reparation av murade fasader med korrosionsskador”(2007) from Svensk Byggtjänst.
During the postwar period, monolithic brick walls were abandoned in favour of other loadbearing wall structures. Brick was however extensively used as a facade material in the form of half-brick cavity walls. This change took place in parallel with the development to insert reinforcement in the bed joints. Ordinary steel grades without special structural corrosion protection were normally used. This has given rise to a lot of damage. The overriding objective of this project has therefore been to develop and document knowledge for the repair of this type of façade. More specifically, the aim has been to develop techniques for the safe bridging of openings in the brickwork and for limiting cracks due to temperature movements, and to produce technical solutions and working methods to solve the problems caused by corroded reinforcement in joints and anchorages.
The book presents methods suitable for the repair of brick facades damaged by corrosion. It is addressed to property owners, contractors and designers. The results are expected to make a contribution to the preservation of assets of great economic and cultural value through appropriate measures.
Resistance of concrete to chloride intrusion – from laboratory tests to performance in the field
Lupin Tang (project leader)
Summary of results with list of publications from SP.
Email: Luping.Tang@sp.se
Chloride intrusion is one of the most important causes of damage to reinforced concrete structures and gives rise to extensive economic and societal consequences. This project is a complement to the EU project ChlorTest with the aim to evaluate different laboratory methods and relevant models for the prediction of service life.
There are many methods for testing chloride intrusion. There are also many models for service life prediction, but most of these have not been verified against real conditions. In the project, two comparative tests were made to evaluate different test methods, and a benchmark test was performed to assess the performance of different prediction models. The results of the benchmark test show that the Swedish mechanism-based model ClinConc gives a prediction that is nearest to the chloride intrusion profiles in the field. Other models that had not previously been calibrated against real conditions in most cases yielded unsatisfactory results. The conclusion is that, at the present time, most models for predicting service life are insufficiently accurate. Calibration against real conditions has been found to be of very great importance for a prediction model that is to be used for life cycle design of concrete structures.
Responsible for this page: Kerstin Franklin