Identical precast columns and connection details were used in both test series. Foundation structures were equipped with two different types of Peikko’s anchor bolts: either HPM® Anchor bolts or COPRA® Anchoring couplers with threaded bars.
The dismount ability tests took place at the end of 2019 in Peikko’s own factory area. Disassembling and reassembling the connections showed, in practice, that bolted connections can provide not only easy and fast assembly, but also effortless disassembly of precast concrete structures. COPRA® Anchoring couplers especially showed an outstanding potential for reusing both the column and the foundation.
Load-bearing tests took place in January 2020 at the test laboratory of Eurofins. Performance of the column connections was evaluated by measuring the displacement of column end under increasing shear load. Both connections showed ductile and robust behaviour, reaching high ultimate load related with large deformation.
These test results proved that bolted connections between precast concrete structures can be considered as demountable without compromising load-bearing capacity.
These tests have been one of Peikko’s first but firm steps towards its future with circular and sustainable solutions. While output showed real promise, and bolted connections seem to be a key for economical reuse of precast concrete structures, reusing should be always validated by the supplier or a third party.