Crack Repair and Confinement
Rhino Carbon Fiber was contacted by Gadberry Construction Company out of Houston, Texas regarding Carbon Fiber Reinforced Polymer (CFRP) repairs on the thrust blocks on a basketball pavilion they were working on. The basketball court was built with a roof over the top of it that was supported by steel arches. These arches sat on thrust blocks on either side of the basketball court.
During erection of the arches, the base plates had to be slid over anchor bolts that were cast into the thrust blocks. During this process some cracking occurred around the anchor bolts on a few of the thrust blocks.
Per Item 786 in the Standard Specifications for Construction and Maintenance of Highways, Streets, and Bridges, the Texas Department of Transportation requires unidirectional high-strength carbon fiber fabric, fully saturated with compatible epoxy resin per manufacturer’s recommendations, to form a CFRP system when making concrete repairs. Gadberry reached out to Rhino for assistance in filling these requirements.
Rhino worked with Gadberry as well as Structural Engineers with The City of Houston to come up with the appropriate CFRP solution for the thrust blocks’ repairs. Rhino then put Olshan Foundation Repair Co. of Houston, LLC in contact with the contractor to provide pricing for the CFRP installation. Olshan was awarded for the project and sent crews out for the installation. The cracks were repaired using epoxy injection and then the pedestals were wrapped with Rhino’s 560 GSM bidirectional carbon fiber.
After the CFRP installation per sub paragraph 2 of Item 786 of the standard, the contractor had to “Provide appearance of coating recommended by CFRP system manufacturer to protect the CFRP from ultraviolet radiation. Match color of protective appearance coating to adjacent concrete.” Rhino recommended elastomeric stucco to protect the carbon fiber and give the City a maintenance free coating that would not crack over time.
The Rhino team was able to work with the City of Houston Engineers and develop a permanent, aesthetically pleasing, and cost effective solution for the repair of the arch bases.