What Are Micro Synthetic Fibers? Types, Uses and Limits
What are micro synthetic fibers? In cementitious materials, the term generally describes small-diameter polymer fibers distributed throughout a mix. Products may use polypropylene (PP), polyester (PET) or another qualified polymer, and may be supplied as monofilament, fibrillated, ultra-fine or specially treated fibers.
What Are Micro Synthetic Fibers Used For?
Their intended role is product- and system-specific. Common evaluation targets include plastic-shrinkage crack control, cohesion, dispersion in mortar and compatibility with placing or finishing. These outcomes are conditional: mixture proportions, evaporation conditions, curing and workmanship still matter.
The Micro Synthetic Fibers for Concrete hub compares available Pioneer options.
Main Forms
Monofilament PP consists of individual filaments and is commonly evaluated for concrete and mortar.
Fibrillated PP opens into a network-like form during mixing.
Ultra-fine fiber provides a high filament count by mass and may suit thin or fine cementitious systems after trials.
Self-dispersing grades are formulated for handling in selected dry blends.
PET fibers provide a different polymer option that must be assessed on its own documentation.
Know the Boundary
Microfibers should not automatically be described as structural reinforcement or a replacement for conventional steel. Where post-crack residual strength or structural capacity is required, the engineer must select a tested system and use the relevant design provisions.
Specify the fiber by material, geometry, intended function, dosage basis, mixing method and acceptance test—not by the word “micro” alone.
Technical references:
ASTM C1116/C1116M;
ACI 544.1R;
current product TDS.
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