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Utilizing the Resiliency and Longevity of UHP
Name: Utilizing the Resiliency and Longevity of UHP
File: henry presentation 05-12-15.pdf
Size(MB): 1.68MB
Extension: PDF
Event: 2015 ICSC - MIAMI
Speaker Name: Henry, K.
Managed by: sdickens
Date Uploaded: May 29, 2015; 1:59 pm
Download Count: 298
Downloads This Month: 298

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Description:
"Ultra-High Performance Concrete (UHPC) has been studied extensively over the last 20 years and long-term durability compared to normal concrete is a key attribute considered. The characteristics of UHPC which contribute to its resilience capabilities will be reviewed using as references studies performed by the Federal Highway Administration (FWHA) and the US Army Corps with its Marine testing facility at Treat Island, Maine.
The Treat Island study started in 1996 is the oldest running study focused on chloride penetration and freeze/thaw effects on UHPC. The specimens are exposed to hundreds of freeze-thaw cycles per year and the last detailed report was performed in 2009-10. At that time there was “no visible deterioration evident after exposure of 5 to 15 years and there was no evidence of any degradation of mechanical properties after more than 1500 freeze-thaw cycles in some cases”. The next investigation of these samples is scheduled to be performed in 2016 when the samples are 15 and 25 years of age. However, visual inspections done routinely on the specimens indicate there is no superficial deterioration. Predictive models have been used to compare the progression of chloride ions in the material and as expected the UHPC performs well above normal or high performance concrete.
The FHWA’s study conducted from 2002 to 2005 was to understand the characteristics of UHPC in comparison to HPC for potential uses in the US Highway and bridge structure segment. The FHWA is continually looking at innovative solutions and construction techniques for new construction to achieve a longer service life. They also want to make repairs which will last longer and not require costly maintenance over the life of the structure. The ductility, resiliency and durability of UHPC allows for new designs which will prolong and maintain existing bridges functionality for the coming years.
Over the last 7 years, UHPC has proved that it is well suited for the bridge market in North America. It can be used to cast durable structural elements (i.e beams, waffle deck slab, etc.) or other varied applications (i.e. overlay, pier jacketing, etc.). Using UHPC as a joint material between precast deck panels has been one of the most popular applications because it allows for a faster construction and a much more durable deck compared to cast-in place. Examples of completed projects will be used to highlight the sustainability benefits of UHPC in these types of applications.
UHPC is also being utilized in the architectural realm, where its durability and high strength characteristics are benefiting buildings. Two projects built in the last 5 years are a testament to this materials capability to withstand natural disasters. The Perez Art Museum of Miami utilizes 16 foot mullions to hold into place the large panes of glass. To support the glass façade in a hurricane the mullions need to be extraordinarily strong as well as resistant to the constant exposure to salt air where normal concrete products do not perform very well. In Victoria, British Columbia, The Atrium was designed to resist earthquake loads. The UHPC façade panels reduced the weight of the overall building façade and allowed for a lighter structural system.
It is not good enough anymore to look only at materials that reduce the immediate impact on our environment but we need to also look towards materials that will help us maintain and increase the service life of our built world. Looking at the entire life cycle for structures and knowing that they will survive significantly longer than we could previously build for is what will ultimately make for a more environmentally sound solutions. Resilience and longevity is the key to protecting the rest of this earth from the stresses that occur when we build."

 
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