Title:
Performance of Fiber-Reinforced Flowable Concrete used in Bridge Rehabilitation
Author(s):
Kamal Khayat
Publication:
Web Session
Volume:
Issue:
Appears on pages(s):
Keywords:
DOI:
Date:
10/23/2022
Abstract:
This paper presents the results of a field implementation involving the use of highly flowable fiber-reinforced concrete (FRC) for the re-construction of a new deck slab of a bridge in Missouri. The-two span girders type bridge consists of four girders with span lengths measuring about 126 ft and 115 ft in length. The width of the bridge is 30 ft. A FR-SWC made with 0.5% micro-macro steel fibers and 5% CaO-based expansive agent that can develop high tensile strength, low shrinkage, and high resistance to cracking was selected for the re-decking work given the anticipated high tensile stresses in the bridge deck at the intermediate bent and the relatively high concentration of steel reinforcement necessitating the use of a highly flowable fibrous mixture. The FRC was easily pumped and finished and had slump values of 6 to 10 in. and air volume of 4.4% to 5.8%. The 56-day compressive and flexural strengths were 7,770 psi and 860 psi, respectively. The average shrinkage values determined at 56 and 260 days of age were limited to 185 and 320 micro-strains, respectively. The presentation will report on the in-situ performance of the concrete and performance of the proposed FRC.