What is macro fiber in concrete?
What macro fiber means in simple words Macro fiber in concrete means a larger fiber that is added to a concrete mix so the concrete can perform better after cracking starts. In today’s concrete industry, the term usually points to macro synthetic fibers, often made from polypropylene or other polyolefins. ACI 544.3R defines macrosynthetic fibers as synthetic fibers with an equivalent diameter greater than 0.3 mm, and it notes that polypropylene fibers can be either micro or macro depending on size. EN 14889-2 uses the same 0.30 mm line and says macro polymer fibers are generally used where residual flexural strength is needed. That simple size split matters because not […]