Annual Concrete Labs at Carleton

Confined concrete cylinder after failure
Confined concrete cylinder after failure

Teaching the undergrad students about emerging materials this week. To make our labs more educational this year (with massive amounts of extra safety protocols added), we conducted several concrete compression tests on conventional concrete wrapped in a carbon fiber reinforced polymer (frp). The students are able to compare their normal conventional concrete compression cylinder tests to compression tests of concrete cylinders with frp wrap.

A big thanks to Sika canada for supplying us these frp and adhesive materials, helping with training, and above all making this lab an awesome addition to our undergrad class this year! You can see one of the many tests below;

The above video shows one of the concrete compression tests with frp wrap (the best bit is near the end). A sacrificial camera was used to record failure in a safe way (an old Sony Cybershot from 2006). The cylinder failed with a compressive stress above 65 MPa (around 500 or so KN), whereas the average normal compressive failure strength of this concrete mix (without frp) was about 40 MPa.

The students were asked at the end of the lab to discuss the mechanisms and effects of ‘confinement’ using frp after observing the lab.

Steel Stub Column Undergrad Lab

We did a very ad hoc style image correlation test using a steel stub column in the undergrad labs. Though not really an accurate way to adhere image correlation paint though, however; it was a good illustration of observing yielding and buckling effects on the column as the test progressed. Images in this video were taken at 1 second intervals, and the video represents 100s of image put together. Images were taken using a Canon 5d Mark 3.