Bestandighetsegenskapene til hvit betong sammenlignet med grå betong i tilsvarende fasthetsklasse Forsøk av fryse/tine-nedbrytning med avisingssalter.

Abstract

The basis of this master thesis is the new planned «Knubben» harbor bath in Arendal. The architects from Snøhetta had decided to build the construction in white concrete. White concrete is curently a material that is not widely used compared «traditional» gray concrete. The construction is planned located in the harbor basin close to Arendal and will therefore be exposed to a harsh environment. There are therefore strict requirements to the concrete to ensure structural integrity and reduce deterioration. It is therefore interesting to see whether the durability of the white concrete similar to gray concrete of same quality. The following research question has been formulated: How are the durability properties of white concrete compared to gray concrete in the same strength class? The white and gray concrete is produced in the construction lab at UiA. The main focus is to test the deterioration mechanism frost/deterioration. The freeze/thaw resistance of white concrete is compared to gray concrete. The following test method is used: SN-CEN/TS 12390-9:2016. Testing hardened concrete — Part 9: Freeze-thaw resistance with de-icing salts — Scaling The results show that the durability of the concrete is dependent on several factors. The results from the freeze/thaw- test can not sufficiently answer the research question. The findings of this thesis prove that there is insufficient basis to conclude on the white concrete durability compared to grey «traditional» concrete, due to inadequate scaling test results defined per the standard. iv