Concrete With Increased Modulus of Rupture (Tensile Strength)

[dreber]

Hey Eng-Tips,

I am looking for information about the state of the art in unreinforced concrete using additives such as steel/glass/polymer fibers.

Specifically, I am looking for a shotcrete with the highest modulus of rupture that I can get my hands on. Unfortunately, in my situation, steel reinforcing bars are not an option.

 

[dreber]

Found this:

http://precast.org/precast-possibilities/case-studies/ultra-high-performance-concrete/

 

[Ron]

Fiber enhancement will increase the modulus of rupture, particularly if you use steel or stainless steel fibers. For shotcrete, I would suggest Mitchell Fibercon's short, ductile steel fibers. Glass and Poly fibers are not as effective in shotcrete and the long steel fibers that are great for cast-in-place concrete don't work will with shotcrete.

Good luck.

Here is a link to their website:

http://www.fiberconfiber.com/

ps....I do not have any interest in Mitchell Fibercon and offer these comments only from my experience and past involvement on ACI Committee 543 for fiber enhanced concrete.