The effect of high temperature on reactive powder concrete

• This paper presents the results of study on properties of RPC at high temperatures.
• The results clearly reveal use of RPC without polypropylene fiber was not suitable.
• The properties of RPC with polypropylene fiber were also discussed.
• The addition of 1% polypropylene fibers in RPC is recommended.

The properties of reactive powder concrete with different plastic fiber ratios were investigated at different temperatures. Samples with the dimensions 7 × 7 × 7 cm were produced using CEM I 52.5 R cement, quartz sand, quartz powder, silica fume, steel wire, a superplasticizer, polypropylene fibers, and water. To achieve high strength the concrete specimens were subjected to compression after casting and accelerated curing. After the curing process, the concrete was exposed to temperatures of 20, 100, 400, 700, and 900 °C for 3 h. A cooling regime was slowly applied to the air after the heating process. Compressive strength, unit weight, and ultrasonic pulse velocity tests were performed on the samples. The physical structures and compressive strengths of the samples were examined.