Title: Freeze-Thaw Durablity of Fiber Reinforced Concrete
Author(s): P. N. Balaguru and V. Ramakrishnan
Publication: Journal Proceedings
Appears on pages(s): 374-382
Keywords: air entrainment; cement content; dynamic modulus of elasticity; fi-ber
reinforced concretes; flexural strength; freeze-thaw durability; water-cement ratio.
The results of an experimental investigation on the freeze-thaw durability of fiber reinforced concrete is presented. The primary objective of the research program was to determine whether the air content is the most significant parameter for the freeze-thaw resistance of fiber reinforced concrete, as is the case with normal concrete. Accordingly, air content in the mixtures was varied from 1.2 percent to 10.8 percent. The results indicate that air content is the most significant factor. Based on the results, it is recommended that at least 8.0 percent air content should be specified for concrete structures exposed to severe freeze-thaw loading. Comparison of fiber reinforced concrete specimens with plain concrete specimens indicates that their behavior under freeze-thaw loading is essentially similar. For the same air content, freeze-thaw durability is the same for both plain and fiber reinforced concrete. An increase of cement content and a reduction of water-cement ratio improves the durability. The results also indicate that the toughness index of fiber reinforced concrete does not change appreciably with freezing and thawing, provided the mixture is designed to prevent deterioration by incorporating sufficient air.