Experimental study and theoretical prediction of flexural behaviors of reinforced SFRELC beams

摘要

To promote the structural application of a new high-performance steel fiber-reinforced expanded-shale lightweight concrete (SFRELC), the experimental study on flexural behaviors of reinforced SFRELC beams was conducted in this paper. Compared to two reinforced beams without steel fiber, eight reinforced SFRELC beams with steel fiber in volume fraction ranged from 0.4% to 1.6% were fabricated and tested under two-point concentrated loads. Results showed that the cracking moment, the flexural stiffness, the flexural capacity and the flexural ductility of reinforced SFRELC beams were effectively promoted due to the addition of steel fibers. The crack growth was restrained with decreased space and width. Concrete strains at normal-section of mid-span fitted the assumption of plain cross-section in flexure. Based on the experimental and theoretical researches, methods for predicting cracking moment, crack width, flexural stiffness and flexural capacity of reinforced SFRELC beam were proposed. (C) 2019 Elsevier Ltd. All rights reserved.