# Comparative Study on Dynamic Compression Behaviors of Steel Fiber-Reinforced Cementitious Composites and Steel Fiber-Reinforced Concrete at Elevated Temperatures

## TL;DR

This study compares how two types of steel fiber-reinforced concrete behave under high temperatures and dynamic loads, finding that each performs better in different temperature ranges.

## Contribution

The study provides a detailed comparison of SFRCC and SFRC under high-temperature dynamic compression, revealing their performance differences across temperature ranges.

## Key findings

- SFRCC maintains ~40% strength at 800 °C with progressive failure, while SFRC deteriorates rapidly beyond 600 °C.
- SFRCC with 2% fiber content shows stable strain-rate sensitivity and fiber pull-out failure at 600 °C.
- SFRC outperforms SFRCC in 600–800 °C due to better aggregate stability.

## Abstract

What are the main findings?
SFRCC maintains progressive failure and ~40% strength at 800 °C; SFRC deteriorates rapidly post-600 °C.SFRCC specimens with a 2% fiber content exhibited stable strain-rate sensitivity and a fiber pull-out-dominated failure mode when subjected to continuously increasing loads at 600 °C.SFRCC excels in stress/toughness at 200–400 °C; SFRC outperforms in 600–800 °C due to aggregate stability.

SFRCC maintains progressive failure and ~40% strength at 800 °C; SFRC deteriorates rapidly post-600 °C.

SFRCC specimens with a 2% fiber content exhibited stable strain-rate sensitivity and a fiber pull-out-dominated failure mode when subjected to continuously increasing loads at 600 °C.

SFRCC excels in stress/toughness at 200–400 °C; SFRC outperforms in 600–800 °C due to aggregate stability.

What are the implications of the main findings?
Supports using SFRCC in structures requiring high-temperature ductility and fire resistance.Highlights importance of fiber–matrix interface stability for dynamic performance in fire conditions.Guides material selection: SFRCC for low–medium and SFRC for medium–high temperature applications.

Supports using SFRCC in structures requiring high-temperature ductility and fire resistance.

Highlights importance of fiber–matrix interface stability for dynamic performance in fire conditions.

Guides material selection: SFRCC for low–medium and SFRC for medium–high temperature applications.

This study presents a comparative investigation of the dynamic compression behaviors of steel fiber-reinforced cementitious composites (SFRCC) and steel fiber-reinforced concrete (SFRC) under elevated temperatures up to 800 °C, utilizing a split Hopkinson pressure bar (SHPB). The experimental results demonstrate that SFRCC exhibits enhanced overall performance at high temperatures, maintaining a progressive failure mode and approximately 40% residual strength even at 800 °C, while SFRC experiences rapid deterioration beyond 600 °C. In the low-to-medium temperature range of 200–400 °C, SFRCC shows significantly higher dynamic peak stress and toughness compared to SFRC. However, in the high-temperature range of 600–800 °C, the superior thermal stability of the aggregate–matrix system in SFRC results in better performance in these metrics. The findings provide insights into the damage evolution mechanisms of fiber-reinforced cement-based materials under coupled thermal and dynamic loads, offering a critical theoretical foundation for material selection in engineering structures exposed to extreme thermal environments.