A civil structure in the Hunter Valley required Epoxy to attach metal to concrete in an environment that experiences a high level of vibration.
We were contacted to determine the levels of vibration and develop a testing methodology to replicate the site conditions for testing in a controlled environment off-site.
Test specimens were constructed using the same method to be used on-site and then vibrated under controlled conditions, to determine the effect the vibration had on the curing of the epoxy.
We measured the vibration of the onsite location and developed a vibration rig to simulate the environment at their test facility. The rig was designed to be capable of vibrating a 100kg concrete test specimen at the measured vibration frequency, amplitude and duty cycle seen on-site, plus a factor of safety, for the duration of the epoxy cure.
This project was unique as the test specimen was vibrated to replicate the actual vibration present on the structure multiplied by a safety factor.
The vibration which was not constant in nature and the weight of the test specimen required a specially designed test rig to be developed that used resonance and a control feedback loop to maintain the desired vibration characteristics over the long test period.
The energy to vibrate such a mass needed to be high, resulting in resonance having to be achieved to vibrate it at the appropriate safety factor.
The concrete, epoxy, and steel were vibrated at the required safety factors for the defined times. The results of the pull test and the shear test showed that the vibration had little to no effect on the curing of the epoxy.