Title: High-Performance Concrete with Polypropylene Microfibers for Fire Safety

Author(s): Debora Ganasini, Carmeane Effting, Adilson Schackow, and Itamar Ribeiro Gomes

Publication: Structural Journal

Volume: 119

Issue: 4

Appears on pages(s): 197-209

Keywords: fiber-reinforced concrete; high compressive strength; highperformance concrete; high temperature; polypropylene microfibers; rice husk silica; suspended silica fume

DOI: 10.14359/51734652

Date: 7/1/2022

Abstract:
This paper presents results from experimental studies on residual mechanical properties of high-performance concrete reinforced with polypropylene microfibers after exposure to elevated temperatures. A conventional concrete (compressive strength of 25 MPa) and high-performance concretes (compressive strength above 78 MPa) with 1, 2, and 3 kg/m3 additions of polypropylene microfibers were developed. The mixtures were subjected to temperatures of 100, 200, and 300°C for 60 minutes. In the second part of this study, a high-performance concrete with 2 kg/m3 of microfibers was analyzed. Compressive strength, splitting tensile strength, and elastic modulus tests were also performed at 200, 400, and 600°C. Results from the experiments show that polypropylene microfibers were extremely important in minimizing the reduction of compressive strength, where the contents of 2 and 3 kg/m3 were the most effective. Through numerical simulation, it was possible to find the longitudinal elastic modulus and the Poisson’s coefficient at each temperature tested.