Title:
Structural Testing Of Non-Proprietary UHPC For Closure Pours Used In Standard GDOT Precast Bridge Deck Panels
Structural Testing Of Non-Proprietary UHPC For Closure Pours Used In Standard GDOT Precast Bridge Deck Panels
Author(s)
Ngeme, Lixrine Epie
Advisor(s)
Stewart, Lauren K.
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Abstract
Ultra-high-performance concrete (UHPC) is a type of concrete that is known for its exceptional strength, durability, and resistance to cracking. Proprietary UHPC is primarily made by combining cement, silica fume, quartz flour, fine sand, high-range water reducers, and steel or polymer fibers.
UHPC has been used in a variety of applications, including bridges, tunnels, high rise buildings, and other structures that require high strength and durability. One of the
main advantages of UHPC is its ability to support high loads with relatively thin sections, which can lead to significant cost savings in construction. In 2018, researchers at the Georgia Institute of Technology developed a non-proprietary ultra-high-performance
concrete (UHPC) mix that could be produced using locally available materials. The mix consisted of Portland cement, metakaolin, fine sand, water, and a high-range water
reducer. The mix design demonstrates the required 28-day compressive strength of at least 18,000 psi. This UHPC mix was designed to meet the high-performance requirements of bridge construction while also being cost-effective and environmentally
sustainable. The closure joint is a critical component of a bridge that accommodates the expansion and contraction of the bridge deck due to temperature changes. The UHPC
mix was used to fill the closure joint between two adjacent bridge slabs.
The performance of the UHPC mix in the closure joint was evaluated through a series of tests, including compression tests, and flexural tests. The UHPC mix was found to have high compressive and flexural strength, as well as excellent adhesion to the
bridge decks. The primary goal for this research was to use the non-proprietary UHPC mix developed in the previous research at Georgia Institute of technology, to perform a large structural test on closure joint of bridge slabs in Georgia. Two tests were performed successfully and detailed reports from observing these tests followed. Insights were
gained from these tests as to the viability of the non-proprietary mix for closure pour applications. The mix proved successful in this regard, indicated by both-large scale
structural test specimens failing via crushing of the precast concrete panels rather than failure being governed by the UHPC joint.
The results of the tests demonstrated that the non-proprietary UHPC mix
developed in Georgia was a viable option for use in bridge construction. The UHPC mix showed superior performance compared to traditional concrete mixes and could provide a
cost-effective and environmentally sustainable solution for bridge construction.
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Date Issued
2023-08-28
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