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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Long Term Durability of Synthetic Fibers in Concrete
Author(s): Anil Khajuria, Kailash Bohra, and P. Balaguru
Publication: Special Publication
Appears on pages(s): 851-868
Keywords: accelerate aging; admixtures; air entrainment; durability; flexural strength and toughness; slump; synthetic fibers; Materials Research
Abstract:Durability of fibers in concrete is a concern for nonmetallic fibers. This paper presents the results of durability studies conducted for synthetic fibers made of Nylon 6, polypropylene, and polyester. Long-term durability was estimated using an accelerated aging process. In this process, the specimens were stored in lime-saturated water maintained at 50 C. The integrity and the effectiveness of the fibers were studied using flexural toughness of 100 x 100 x 360-mm prisms tested under four-point loading. The concrete was designed for a 28-day compressive strength of 20 MPa, which is commonly used for field applications. A higher-than-normal fiber content of 4.75 kg/m3 (approximately 0.5 volume percent) was used to obtain consistently measurable toughness index values. All the fibers were 19 mm long. Nylon 6 and polyester fibers were made of single filaments, whereas polypropylene fibers were fibrillated. The results indicate that, at a fiber loading of 4.75 kg/m3, all three fibers provide post-crack resistance. Nylon 6 and polypropylene fibers are durable in alkaline environment present in concrete. This is demonstrated by the effectiveness of fibers measured in terms of flexural toughness values and the general load-deflection response. Specimens with polyester fibers had some loss of ductility when subjected to accelerated aging.
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