Surprising Preliminary

adapted Fig 3-10 "Reinforced Concrete...." by James K. Wight

It is rare in the extreme that initial testing on some material  exceeds the wildest expectations, especially if it is a garage development.  In this case, the testing lab was not able to test ASTM 1609 “residual strength”, which routinely adds close to 100 psi (when “chopped” fibers used) which would have made our numbers jump even higher,  into the Ultra-High Performance Concrete (UHPC) range.

 An interesting feature of these lab results is that the test was unable to recreate the actual geometry of how the patented tool operates.

The TNSR Delivery Mechanism wraps the concrete in encircling spirals of  fiber as it is delivered, imitating a structural stirrup.  That’s why we call it Swole-Cretetm.

 

Fiber Distribution Ring

Each box of Ultra-High Molecular Weight (UHMWPE)  fiber in the TNSR Fiber Distribution Ring holds at least 1800 feet of fiber.  Depending on delivery RPM, the amount of high strength UHMWPE fiber delivered might increase the cost of concrete $25 per cubic yard while at the same time increasing flexural strength and durability more than forty (40) percent.  All of this being accomplished without changing the concrete supply chain or mix recipes in any way.  It also has the capability of handling multiple types of streamable substances at the same time on differing bobbin sizes.

Deposits ADD Up

Fiber use in concrete is part of the definition of Ultra-High Performance Concrete (UHPC).  Another part of the definition of UHPC is achieving a modulus of rupture of  at least 1000psi.  Continued testing of the TNSR Delivery Mechanism seems certain to achieve that milestone.  We were within striking distance on the very first test.  As an example  of UHMWPE fibers, the same ones TNSR is streaming into concrete and almost the same number of fibers which make up a 1/4″ diameter rope, the following video gives a visual example of their impressive strength.  Imagine having every layer, every cubic inch, of a concrete delivery with these fibers holding layers together. 

Admire UHMWPE Strength!

NO steel Tiltup panel

This is the first full-size test of our composite concrete:UHMWPE system.  While being at the small end of tiltup panels (8′ x 25′),  it exceeded our expectations because success is rarely expected on the first attempt.  This is truly invigorating!

Success on the first attempt was not expected by “experts”.

• Reviewing leading textbooks, like “Reinforced Concrete: Mechanics…” by James Wight, and thirty years of engineering reports informs you that one cannot significantly increase the tensile strength of concrete by adding fibers. In fact, interesting tests for Fiber Reinforced Concrete (FRC) like ASTM 1609 are not as commonly performed today because of this general understanding.

• The TNSR Delivery Mechanism continuously streams Ultra High Molecular Weight Polyethylene (UHMWPE) fibers, today’s strongest production fiber. FRC applications to this point have always used chopped fibers (~2″) added into the concrete mixer.

Would rebar add tensile strength to concrete if it were chopped into 2″ pieces?

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