Reinforcing Concrete with Powder Recycled FRP

I know fiberglass is common thing to add to concrete to make it tougher and less prone to cracking.

Also there some types of plasticizer agents used that also make concrete more resilient to slight bending stresses as well.

Perhaps doing some experimenting and documenting your findings may prove useful in turning your byproduct into a niche market item such as the concrete used to make pre cast concrete lawn ornaments or steping stones or other such items.

Fiberglass strands can be added as a reinforcement for concrete and can work well if steel rebar corrosion is a concern. Care is needed when adding fibers to the mixture to make sure the fibers are evenly dispersed and not clumped together in the conrete mixture.

"Pozzolan."

a dust of ground fiberglass and resin might be useable as a way to dispose of the stuff. I can not see strength coming from it.

Cement is a strong alkali, and will etch glass fibers, unless selected to be alkali proof As for long fibers being used in cement I see them advertised

Tnx every1

My question is more about the dust of FRP.

I mean using a grinder to make waste FRP parts into powder and some how use it as a filler in concrete to reduce slump and improve mechanical properties ofcocnrete.

contact the local concrete institute.

http://www.concrete.org/general/home.asp

FRP in dust form may not add value.

But in larger pieces may give reinforcement.

Best form could be a mix of the dust and resin could be used for coating the iron rods for corrosion prevention.

Doubtful if it will add any strength to concrete, nor do I think it'll harm the concrete either, unless you add too much of the ground-up FRP (also see concerns below).

Care must be taken in limiting the amount of FRP by volume in the concrete mixture. I do agree with other that thorough mixing of the FRP into the mixture is a must (for dispersal and ultimate concrete strength reasons). Use of a mid-range or high range plasticizer with the FRP is most likely not a bad move....it'll aid in mixing, and most assuredly the concrete workability once it is placed. A lot depends on the size distribution of ground-up FRP too......do a thorough sieve analysis and strictly adhere to consistancy of the sieve distribution for each of your test runs.

My recommendation is that you make some concrete test cylinders with varying amounts of FRP in a PROVEN concrete mixture with known properties. I also recommend that you limit the amount of FRP in the mixture to no more than 5%. You should also test in the laboratory the reaction of the glass fibers with the concrete to see if there will be any detrimental affects (as other posters have warned about).

Get back to us later on and let us know what the results of your testing are, okay?

Lastly, I don't recommend that you use the FRP in any structural elements until such time you have proven that there are no ill affects imparted from the FRP in regard to the overall strength of the cured concrete (shear, tensile, rupture, and compressive strengths). Best to use a concrete mixture containing FRP in "Flowable Fill" or other like uses.

I highly recommend that you use the Construction Material textbook written by Prof. Marrotta of Hudson Valley Community College (Troy NY) as a reference.....that guy knows his concrete inside and outside and backwards! I still have his text (and to this day I still use it on a reg. basis) that I used in his course some 33 years ago. Google search it, or you can find it in Amazon or Ebay....your choice! :-)

Good luck with your endeavor!