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Mojtaba Zolfaghari

Mojtaba Zolfaghari

Academic rank: Associate Professor
ORCID:
Education: PhD.
ScopusId: 35200092900
Faculty: Engineering
Address: Arak University
Phone:

Research

Title
Assessing the impact strength of steel fibre-reinforced concrete under quasi-static and high velocity dynamic impacts
Type
JournalPaper
Keywords
Concrete,Steel fibre, Dynamic impact, Quasi-static, Silica fume
Year
2015
Journal Construction and Building Materials
DOI
Researchers Mojtaba Zolfaghari ، Mahmoud Nili ، Amir Hossein Ghorbankhani ، Ali Alavi Nia

Abstract

The behaviour of fibre-reinforced concrete under high velocity impact was assessed and compared to that for the quasi-static one. Two water cement ratios of 0.45 and 0.3 were used. Steel fibre at 1% by volume was used in the predetermined samples. The projectile method was used in the velocity range of 600–1130 m/s, and quasi-static impact by 3 m/s was performed. The results showed that in the both velocities conditions, the inclusion of fibre was a vital factor for integrity of the samples. In the quasi-static test, samples with 0.3 water cement ratio had better resistance. The dynamic impact resistance was belonging to the 0.45 water-cement ratio specimens. The failure modes of the quasi-static test were radial and diagonal in the normal and fibrous samples, respectively. The high velocity impact led to a shear failure in the non-fibrous, whereas, the projectile was penetrated into the fibrous samples target without fracturing.