Chapter 2
Dynamic Compressive Mechanical
Properties of UHPCC
2.1 Introduction
The mechanical properties of UHPCC could be affected by many factors (e.g., curing
conditions, aggregate size, steel fiber content and type), in which the steel fiber plays
an important role. In this Chapter, the dynamic compressive behavior of UHPCC
with different steel fiber contents and types at high strain rate is mainly concerned.
In the existing studies on the influence of steel fiber reinforcement type on the
dynamic compressive behavior of steel fiber reinforced concrete (SFRC), Wang et al.
(2008) performed Split Hopkinson pressure bar (SHPB) compressive test on the
SFRC specimens with 0, 3.0 and 6.0% ultrashort steel fibers at the strain rate up to
100 s
−1 , and found that both the fiber volume fraction and strain rate exerted significant enhancing effect on the dynamic compressive strength. Lai and Sun (2009)
studied the effect of steel fiber content (0, 3.0 and 4.0% by volume) on the dynamic
compressive properties of UHPCC at different strain rates (23.7 ~ 99.2 s
−1 ) by using
the SHPB device. It was concluded that UHPCC is strain rate dependent, and the
elastic modulus, peak stress and the corresponding strain as well as the toughness
of UHPCC increased with increasing the strain rate. While the enhancement effect
of steel fiber content on the dynamic strength was reduced at higher strain rate. Hao
and Hao (2013) conducted a series of SHPB test to study the effects of steel fiber
content (0 ~ 1.5% by volume) and strain rate (50 ~ 200 s
−1 ) on the dynamic compressive behavior of spiral steel fiber reinforced concrete. The results showed that, the
compressive strength and elastic modulus exhibited increasing sensitivity to strain
rate with increasing the steel fiber content. Also, the energy absorption capacity had
a strong dependency on the steel fiber volume fraction under high strain rate. Su
et al. (2016) evaluated the influences of two types of steel fibers (micro-straight and
twisted) with different lengths and aspect ratios on the dynamic compressive properties of ultra-high performance concrete (UHPC). It was found that the micro-straight
steel fiber had better effect on increasing the dynamic compressive strength, and the
increase of steel fiber length and aspect ratio had positive impact on it. Li et al. (2016)
investigated the influence of steel fiber content (0 ~ 1.5% by volume) on the dynamic
© Science Press 2021
Q. Fang et al., UHPCC Under Impact and Blast,
https://doi.org/10.1007/978-981-33-6842-2_2
31
Dynamic Compressive Mechanical
Properties of UHPCC
2.1 Introduction
The mechanical properties of UHPCC could be affected by many factors (e.g., curing
conditions, aggregate size, steel fiber content and type), in which the steel fiber plays
an important role. In this Chapter, the dynamic compressive behavior of UHPCC
with different steel fiber contents and types at high strain rate is mainly concerned.
In the existing studies on the influence of steel fiber reinforcement type on the
dynamic compressive behavior of steel fiber reinforced concrete (SFRC), Wang et al.
(2008) performed Split Hopkinson pressure bar (SHPB) compressive test on the
SFRC specimens with 0, 3.0 and 6.0% ultrashort steel fibers at the strain rate up to
100 s
−1 , and found that both the fiber volume fraction and strain rate exerted significant enhancing effect on the dynamic compressive strength. Lai and Sun (2009)
studied the effect of steel fiber content (0, 3.0 and 4.0% by volume) on the dynamic
compressive properties of UHPCC at different strain rates (23.7 ~ 99.2 s
−1 ) by using
the SHPB device. It was concluded that UHPCC is strain rate dependent, and the
elastic modulus, peak stress and the corresponding strain as well as the toughness
of UHPCC increased with increasing the strain rate. While the enhancement effect
of steel fiber content on the dynamic strength was reduced at higher strain rate. Hao
and Hao (2013) conducted a series of SHPB test to study the effects of steel fiber
content (0 ~ 1.5% by volume) and strain rate (50 ~ 200 s
−1 ) on the dynamic compressive behavior of spiral steel fiber reinforced concrete. The results showed that, the
compressive strength and elastic modulus exhibited increasing sensitivity to strain
rate with increasing the steel fiber content. Also, the energy absorption capacity had
a strong dependency on the steel fiber volume fraction under high strain rate. Su
et al. (2016) evaluated the influences of two types of steel fibers (micro-straight and
twisted) with different lengths and aspect ratios on the dynamic compressive properties of ultra-high performance concrete (UHPC). It was found that the micro-straight
steel fiber had better effect on increasing the dynamic compressive strength, and the
increase of steel fiber length and aspect ratio had positive impact on it. Li et al. (2016)
investigated the influence of steel fiber content (0 ~ 1.5% by volume) on the dynamic
© Science Press 2021
Q. Fang et al., UHPCC Under Impact and Blast,
https://doi.org/10.1007/978-981-33-6842-2_2
31