Effect of fibers on the temperature field and radialdeformation behavior of self-compacting concrete pipesunder cyclic fire condition

Abstract

In this paper, the radial deformation of fiber reinforced self-compacting con-crete (SCC) pipes under cyclic fire conditions is studied. A series of experimen-tal study on the temperature fields and radial deformation properties of steelmesh, polypropylene fiber (PP fiber), and macro steel fiber (SF) reinforcedSCC pipes subjected to fire is carried out. A novel method for measuring thedeformation of pipes under high temperature has been proposed. The resultsindicate that both micro PP fiber and macro SF are effective in decreasing thetemperature difference and reducing the radial deformation in each thermalcycle. A significant positive synergistic effect on decreasing the residual radialdeformation can be achieved by combined use of macro SF and micro PP fiber.The elastic theory is used to estimate the elastic portion in the total radialdeformation, and the elastic radial deformation is about 22.3% of the maxi-mum radial deformation in the first thermal cycle. Based on the elastic calcula-tion and observed experimental results, a simplified method for estimating themaximum radial deformation in the first thermal cycle is proposed.