Natural Pozzolans in the Pacific Northwest and their Beneficial Uses

Webinar: Natural Pozzolans in the Pacific Northwest and their Beneficial Uses

 

PRESENTATION ARCHIVE

OVERVIEW

The eruption of Mt. Mazama approximately 7,700 years ago created what is now known as Crater Lake. This eruption blanketed the Pacific Northwest with volcanic ash. This volcanic ash has been collected from several locations in Southern Oregon near the Oregon Institute of Technology campus. This volcanic ash has been tested and shown to have properties beneficial of a natural pozzolan. This seminar will present the results of a significant laboratory program to determine the natural pozzolanic capabilities of Mt. Mazama volcanic ash. In addition, information will be presented on a field application using the material to create ADA accessible trail surfaces.

KEY LEARNING OUTCOMES

  • Attendees will learn the location and natural pozzolanic properties of Mt. Mazama volcanic ash.
  • Attendees will learn trail surface requirements for ADA accessibility.
  • Attendees will be given information on how to use Mt. Mazama volcanic ash for trail stabilization.

THE RESEARCH

This webinar is based on a study funded by the National Institute for Transportation and...

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Webinar: Improving Recreational Trail Accessibility with a Volcanic Ash Treatment

PRESENTATION ARCHIVE

OVERVIEW

Recreational trails serve as valuable transportation corridors and support the health of users. Wheelchair accessibility of recreational trails depends on a variety of conditions, including slope, cross-slope, and surface characteristics. This project focused on improving the firmness and stability of a 0.2-mile section of trail that was otherwise accessible. The existing trail surface consisted of loose ¼” off-specification aggregate on native soil. A volcanic ash-Portland cement binder, studied in prior research, was batched, distributed, mixed, wetted, and compacted on site to improve the firmness and stability of the surface resulting in a smoother surface with less rolling resistance. The webinar will present details of the trail conditions, materials, batching, placement, and surface characteristics before and after treatment.

KEY LEARNING OUTCOMES

Attendees will be able to:

  • Describe and differentiate pozzolanic and cementitious...
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