Two structures have been inspected: The parts of the Green Bridge at Vejle in Jutland (constructed in 2002) made with bio ash and the “fill in” concrete in an underground sewage construction in connection with waste-water detention tanks constructed in 2004.
The results from investigation of the bridge show that the development of strength for the concrete with 9 % bio ash (of the powder content) is comparable with the other concrete types (Reference concrete: concrete with cement, fly ash and mikrosilica and experimental concrete with a high amount of fly ash app. 35-38 %). There are no indications that the concrete has more cracks or other structural damage than the other concrete types.
The two different bioash concrete investigated were still young, less than 5 years of age, and consequently it has not been possible to evaluate their long term durability performance. However, there are no signs that the long-term durability will develop any different than expected for comparable conventional concrete.
Final report for Task 7 is completed.
Part of the Green Bridge. A slight nuance difference can be seen on the beam. This indicates the casting joint.
Status per 2008.09.25