Please note that we are unable to offer continuing education credits for views of recorded presentations found in our archives.
Webinar Archives
| Aired | Webinar | Presenter | Length | Description | Recording | Presentation |
|---|---|---|---|---|---|---|
| 5/25/22 | Ultra High Performance Concrete (UHPC) – Design and Application | Travis Konda (Senior Technical Advisor, HNTB) and Mario Ratnaraj (Bridge Engineer, HNTB) | 1 Hour |
Ultra High Performance Concrete (UPHC) describes a class of concrete mat… Ultra High Performance Concrete (UPHC) describes a class of concrete material with a unique set of properties including: Strengths of 21,000 ksi plus, high ductility, low permeability and rapid strength gain. With these unique material properties, UHPC facilitates short development lengths, thin overlays and the potential for further development in optimized prestress girders for longer spans with less material. UHPC continues to play an important role in Accelerated Bridge Construction serving as the connecting material between precast elements allowing for small joints with short lap lengths while obtaining full connectivity between the elements. This presentation will introduce the audience to UHPC, the basic material properties, applications and lessons learned. |
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| 10/13/21 | We Have to Build it Where? Solutions for Building on Challenging Construction Sites | Michael Hoeft / Dan Schellhammer / Scott Spisak | 1 Hour |
As physical sites grow and expand, means and methods for property develo… As physical sites grow and expand, means and methods for property development become much more complex. With abbreviated construction schedules and significant liquidated damages, the ability to gain some control of the uncontrollable becomes essential. The earlier this process is recognized and integrated into the project, the better the chance for success. This presentation will address several ways to work with challenging construction sites using cement and concrete; delivering large projects to the owner on time, economically and sustainably. |
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| 12/8/21 | Workability and the Impact of Workability Retention | Joseph Daczko (Master Builders Solutions) | 1 Hour |
Contractors want concrete to be as workable as possible to facilitate pl… Contractors want concrete to be as workable as possible to facilitate placement and consolidation without compromising performance in the hardened state. Concrete producers strive to consistently deliver expected performance attributes. Yet, hydration of Portland cement leads to a change in fresh concrete properties immediately after batching, most notably with respect to mix slump or workability. In air-entrained concrete mixtures, furthermore, modified slump can lead to changes in air content, typically a reduction, and potential rejection of the load. Invariably, rejected loads result in loss of revenue and reduced profits for concrete producers. This presentation will discuss workability retention and the various methods traditionally used to manage it. Additionally, an innovative, new admixture is introduced that provides workability retention without the adverse effects of current practices. |
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