Q. Which AR-glass fibers are recommended for ready-mix concrete?

The type of AR-glass fiber to be used in ready-mix is determined by the application. There are two types of AR-glass fibers: HD (high-dispersion) and HP (high-performance). HD is a very fine monofilament fiber that adds a large quantity of fibers to the concrete, approximately 100 million to one pound of ∏‰ long fibers˜ which computes to approximately 1 million strands of HP per pound. HP is a single strand composed of 100 HD fibers bonded/fused together.

Due to their high fiber count, HD AR-glass fibers perform very well as plastic shrinkage reinforcement and as secondary reinforcement, whereas HP fibers used at higher dosage rates provide post-first crack reinforcement where sustained loading after first crack is a consideration (C1609 and C1399 type applications).

HP AR-glass fibers are an excellent alternate to steel/synthetic fiber blends and at a measurable cost savings. Their use in elevated composite deck systems has great potential particularly in those cases where negative moment is a factor.

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