Dynamic Mechanical Properties of Red Sandrock-Polypropylene Fiber Reinforced Concrete Composite under Impact Load

To investigate the dynamic mechanical properties and fracturing behavior of the red sandrock-polypropylene fiber reinforced concrete (R-PPFRC) composite, R-PPFRC composite specimens with different Polypropylene fiber (PPF) dosage were fabricated. Conducted quasi-static compression experiments and dy...

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Bibliographic Details
Published in:KSCE journal of civil engineering 2022, 26(3), , pp.1479-1493
Main Authors: Yang, Liyun, Zhang, Fei, Xie, Huanzhen, Chen, Siyu, Lin, Changyu
Format: Article
Language:English
Subjects:
Civil Engineering
Composite materials
Compression
Compressive strength
Crack initiation
Dynamic mechanical properties
Engineering
Failure
Fiber composites
Fiber reinforced concretes
Fiber reinforced polymers
Fracturing
Geotechnical Engineering & Applied Earth Sciences
Impact loads
Impact strength
Industrial Pollution Prevention
Load distribution
Mechanical properties
Photography
Polypropylene
Reinforced concrete
Split Hopkinson pressure bars
Strain rate
Toughness
Tunnel Engineering
토목공학
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Summary:To investigate the dynamic mechanical properties and fracturing behavior of the red sandrock-polypropylene fiber reinforced concrete (R-PPFRC) composite, R-PPFRC composite specimens with different Polypropylene fiber (PPF) dosage were fabricated. Conducted quasi-static compression experiments and dynamic experiments by using Split Hopkinson pressure bar (SHPB) apparatus and testing machine. The fracture characteristics and process of composite specimens were analyzed with the assistance of ultra-high-velocity camera photography. It can be concluded that the dynamic increase factor and the dynamic compressive strength of composite specimens R-PPFRC increase with the increase of load level, indicating a remarkably strain rate strengthening effect. The optimal PPF content is determined finally. The dynamic impact toughness, ultimate toughness, and dissipation energy of R-PPFRC are significantly affected by the load level and the PPF content. The fracturing process of the composite specimen is divided into four phases, crack initiation, crack expansion, crack cluster and ultimate failure. After going through these phases, the ultimate failure pattern is mainly shear and split mixed failure.
ISSN:1226-7988
1976-3808
DOI:10.1007/s12205-021-1233-0