A proprietary test described in ASTM International’s Journal of Testing and Evaluation provides for direct comparison of steel fiber and conventional rebar concrete specimen tensile properties, according to Helix Steel, developer of Twisted Steel Micro Reinforcement. The Direct Tension method enables engineers to determine steel fiber specimens’ first crack and post crack tensile strength, plus tensile modulus of elasticity. The testing and data analysis approach greatly reduces the variability of results, Helix officials note, thereby solving past problems rooted in small specimen sizes and material inconsistencies.
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