Latest Testing Shows Promise of Cor-Tuf UHPC H-Pilings – LBM Research Associates

Amazing! Latest Testing Shows Promise of Cor-Tuf UHPC H-Pilings – LBM Research Associates

Information about Latest Testing Shows Promise of Cor-Tuf UHPC H-Pilings – LBM Research Associates

Phil Puccio

At Cor-Tuf, we are always looking for ways to test and maximize the properties of our proprietary Ultra High Performance Concrete (UHPC). We have already shown our way through previous tests the amazing benefits of this new concrete technology in terms of strength and durability. We also showed that Advantages of Cor-Tuf UHPC compared to other conventional UHPC concrete mixes.

In our last round of testing, we looked at the Flexural strength of H piles made of Cor-Tuf UHPC. We looked at this through a “primary axis” where the “H” shape center beam is aligned vertically, and again through a “secondary axis” where the center beam is aligned horizontally. The tests took place in Tallahassee, Florida with the Florida Department of Transportation (FDOT). We are pleased and proud to share the results with you here as they show enormous potential for significant cost benefits for future concrete construction projects with this new concrete product.

Cor-Tuf UHPC H pile test results

All tests were carried out on 30”x30”x30 ‘Cor-Tuf UHPC H piles. These piles are the first of their kind. This shape and size of UHPC piles has not previously been poured and tested, making this an exciting undertaking for our team. (It’s worth noting that these stakes are precursors to a larger 140-inch version we’re currently casting.)

Pictured above is a wide angle view showing the overall setup of the testing process in the Tallahassee test lab. This press is designed to test the large structural components.

The unique design of the H-post offers many advantages over a solid square post:

  • Less material required thanks to the notches in the design
  • Fewer internal components (pre-tensioned strands)
  • Increased strength
  • Cheaper to build due to lower material requirements
  • Lighter in weight
  • Easier to drive as less soil is displaced

In other words, you get all of the functionality of solid square piles, but at a reduced cost. H piles are also more suitable than square piles for more applications. Ideal use cases are:

  • Marine applications
  • Walls (including portable walls)
  • In-situ concrete situations
  • Prefabricated plate carrier
Axial image showing the strand structure of the main axis of the H-pile.

In our first test part, we tested the main axis of the H-pile running in the vertical direction. During this round of testing, we stopped regularly to measure the product at various pressure levels. This can be seen in the result diagram below by the small dips in the diagram line.

Results of the primary axis test.

In our main axis test, we reached 250,000 pounds of pressure. The product has deflected 2.27 inches on what is on. relates Movement of the concrete. As you will see, the deflection is less than on the minor axis. This is because the major axis is stiffer.

Axial image showing the strand structure of the minor axis of the H-pile.

In the second part of the test, we turned to the horizontal minor axis. This round we only stopped once to review the product and then let it go to failure.

As you can see in the photos, the stress cracks start at the bottom and work their way up. The break is curbed. There are no side cracks several meters away from the pressure point, as are typical with conventional concrete.

The H-pile after the fracture in the second part of the test along the minor axis. You can see that the break is contained in close proximity to the pressure source.
A front view of the cracking when testing the minor axis.
Interior view of the crack formation from the minor axis test.

The peak load achieved along the secondary axis was 205,000 pounds per square inch (psi) pressure. The deflection at peak load was just under 4 inches.

Secondary axis test results.

While these stakes are slightly larger than that Square piles that we tested, the results are still impressive compared to the square shape. Given the added benefits and reduced costs, we are moving towards the H-pile design for our future concrete projects. We are confident that this design will make UHPC-H piles a better choice and a smarter investment for the future.

Stay tuned for the coming weeks and months for more results from this and other tests. In particular, keep an eye out for a video trailer highlighting the 140-inch UHPC-H post we are currently casting, as well as video footage of the tests discussed in this post and the larger 140-inch post. We look forward to sharing these results with you as they become available.

Breaking Story – Latest Testing Shows Promise of Cor-Tuf UHPC H-Pilings – LBM Research Associates

The Latest News on Latest Testing Shows Promise of Cor-Tuf UHPC H-Pilings – LBM Research Associates

Original Source:
Category – Concrete

© 2021 - WordPress Theme by WPEnjoy