THE BACKGROUND: FORTA Corporation, founded in 1978, spent the first 15 years in business focused on using low dosages (1.0 to 3.0 lbs./cu yd) of synthetic fibers to control concrete cracking caused by the effects of plastic shrinkage. Yet during that time, the goal was always to refine the fiber characteristics that would allow for much higher dosages and therefore lead to performance improvements in many areas – all while remaining user-friendly in the field. [...]
Myth: Sand- or shot-blasting fiber concrete will reveal more fiber and therefore impede surface bonding agents. ...PART 2 Answer: The synthetic fibers are strong and tough, but certainly not tough enough to withstand the abrasive forces of sand-blasting or grinding, and would be quickly removed from the concrete skin, possibly leaving extremely small fiber ends at or near the surface. We have used micro and macro fibers for over 30 years in concrete [...]
Myth: Fibers in concrete could have a negative effect on bonded toppings. Answer: While there have been cases of some synthetic fibers not finishing well and protruding from the concrete surfaces, it would take an extremely high fiber content to impede the bond of current market-available bonding agents. In the case of those whisker-fibers, we have seen a low-flame weed-burner approach used, to melt them back down to the surface skin, or [...]
The 4 C's of fibers – Configuration, Chemistry, Contents, and Correct length Configuration The most important criterion is the fiber configuration. Common sense would suggest that something deformed or irregular in shape will anchor much better than something straight and smooth. A thin, smooth finishing nail doesn't hold like a heavy lag bolt. For the same reason, fibrillated network and macro fibers anchor better in concrete than smooth monofilament fibers. The fiber's ability to anchor [...]
Another job well done using FORTA® fiber in pervious concrete: The project involved covering over 100,000 sq ft of paving and requiring over 9,000 lbs of the 2 ¼” FERRO-GREEN® pervious macro fiber. There were many interesting facets to the project aside from the use of fiber – a specially-altered laser-guided screed to accommodate the lay down of pervious concrete, the use of a SAP – Super Absorbent Polymer – additive, a hydration stabilizer admixture, a [...]
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To meet the demand of housing at Ohio University, the University in May of 2013 started construction of 4 new suite style residence halls consisting of 900 beds. FORTA-FERRO® synthetic macro fibers were chosen as the secondary reinforcement for both the slab-on-grade and slab-on-decks. Another 4 residence halls are planned for next spring and completion of the project in August of 2015. FORTA-FERRO® has proven time and again to be the synthetic macro fiber of choice by leading contractors who want [...]
Download Technical Report General Pointers: For both low-volume and high-volume fiber projects, there are general pointers that will assist ready-mix producers and pumping contractors in minimizing project-site delays and problems. Concrete that includes synthetic fiber reinforcement has historically been very pumpable, however following the simple precautions noted below will help insure a successful project and a trouble-free jobsite. Mixing: Avoid adding fibers as a first ingredient to central-batch mixing systems or ready-mix trucks. [...]