NetComposites
Airtech

Kentucky Transportation Center Applies Aerospace Technology to Bridges

26 March 2013

The Kentucky Transportation Center’s (KTC) research team, in cooperation with the Kentucky Transportation Cabinet and the Federal Highway Administration, recently determined that a product originally intended for aerospace technologies could be used to successfully repair damaged concrete bridges. 

The product, QISO Braided Triaxial Fabric, is a single layer quasi-isotropic carbon fabric that was developed by A & P Technology.  QISO drastically improves damage tolerance and energy absorption, and has been applied to jet engine fan cases, aircraft control surfaces, and radio dishes. 

Dr. Issam Harik, Manager of the KTC Structures Program at the University of Kentucky, decided to use QISO to restore the capacity of a bridge pier in Louisville, Kentucky.  The steel reinforcement of the pier was severely rusted in the vertical and transverse directions. The concrete cover also had multiple pieces that had deteriorated and fallen off, which exposed the pier core.

“A single layer of QISO Triaxial Fabric can be applied to the bridge pier in place of two orthogonal layers of fabric having unidirectional fibres.  This fabric has cut the application time in half, which reduces the repair costs,” said Harik. 

In October 2012, the QISO fabric was also used to repair a concrete bridge located in Simpson County, Kentucky, US.  Most of the cracks on the bridge were diagonal, but vertical and horizontal cracks were also identified during inspection.  The retrofit required a fabric having multidirectional fibres.  Dr. Abheetha Peiris, a research engineer in the Structures Program at KTC, supervised the project that involved KTC staff members completing the repairs. 

“The QISO Braided Triaxial Fabric provided us the unique opportunity to strengthen the deteriorating beams and halt the crack growth in multiple directions by using a single layer of fabric. This carbon fibre fabric is light weight and can be easily applied to the concrete surface,” said Peiris. 

KTC was the first to use QISO for civil engineering infrastructure purposes. To date, four bridges in Kentucky have been repaired using this technology.






Related / You might like...

ZSK's Technology Showcase Demonstrates TFP Applications

ZSK will hold its bi-annual technology showcase on 21-22 September 2018 at its Krefeld, Germany, headquarters. The Embroidery Technology Show assembles more than 25 exhibitors from around the world to discuss emerging trends in the embroidery manufacturing industry and demonstrate the latest products produced using techniques such as tailored fibre placement (TFP) or smart textiles.

Solvay and Bell Sign Rotorcraft Supply Agreement

Solvay has signed a ten-year agreement for the supply of composites and adhesives to be used across Bell's military and commercial rotorcraft programmes, including the Bell 429, 407, 505, 525, V-22, and UH-1.

SGL Carbon Celebrates Opening of Fibre Placement Centre

SGL Carbon and Fraunhofer IGCV have officially opened the Fibre Placement Centre (FPC) at SGL's site in Meitingen, Germany. Compositence, BA Composites and the Chair for Carbon Composites at the Technical University of Munich have also joined the alliance, and Coriolis Group and Cevotec are planning to come on board as partners.