Effectiveness of synthetic structural fibers for Self-Compacting Fiber Reinforced Concretes

Memoria tratta da "The New Boundaries of Structural Concrete: Session C – New Scenarios for Concrete", ACI IC - Bergamo 2013

This paper presents the results of an experimental work in which two different types of synthetic structural fibers were employed in order to obtain Self-Compacting Fiber Reinforced Concretes (SCFRC) with an improved post-cracking behavior, similar to that obtained by means of steel fiber addition. SCFRC mix design was optimized by varying the dosage of both synthetic fibers and crushed gravel in order to maintain self-compactability at the fresh state, but improving hardened concrete mechanical performance. Compression tests, splitting tension tests, and 3-point bending tests were carried out at 28 days of curing. Also drying shrinkage of SSFRC was evaluated up to 90 days of exposure to 50% relative humidity. A reference mixture without fibers, and one mixture prepared by using steel instead of synthetic fibers were tested, in order to compare the effectiveness of the different kinds of fibers. The experimental results obtained by using synthetic structural fibers were extremely encouraging.

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