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Mechanical Testing of Composite Steel and Reactive Powder Concrete Structural Element
Jan Bujnak1, Peter Michalek1, Frantisek Bahleda1
1Faculty of Civil Engineering, University of Žilina, Univerzitná 78215/1, 010 26 Žilina, Slovakia.
Materials (Basel, Switzerland)
|September 10, 2020
Summary
This study explored reactive powder concrete (RPC) with steel and basalt microfibers, demonstrating significantly enhanced compressive and flexural strengths compared to normal concrete. The high-strength RPC shows promise for efficient structural applications, particularly in composite steel-concrete joints.
Area of Science:
- Materials Science
- Civil Engineering
- Structural Engineering
Background:
- Reactive Powder Concrete (RPC) offers superior mechanical properties compared to conventional concrete.
- High-strength cementitious materials are crucial for advanced infrastructure development.
- Microfiber reinforcement significantly influences concrete performance.
Purpose of the Study:
- To investigate the mechanical behavior of RPC reinforced with steel and basalt microfibers.
- To compare the performance of RPC with normal concrete.
- To evaluate the efficiency of RPC in composite steel-concrete structures.
Main Methods:
- Experimental investigation of RPC properties (compressive and flexural strength).
- Comparison with a control normal concrete mix.
- Push-out tests to assess shear connection efficiency in composite structures.
- Development of finite element numerical models.
Main Results:
- RPC with steel and basalt microfibers achieved a mean compressive strength of 198.3 MPa and flexural strengths of 52.6 MPa and 23.2 MPa, respectively.
- RPC demonstrated significantly higher mechanical performance than normal concrete.
- High RPC strength facilitates material savings and weight reduction in precast construction and improves steel beam joints.
Conclusions:
- RPC, particularly with microfiber reinforcement, offers substantial improvements in mechanical strength.
- The high performance of RPC is advantageous for structural applications, including composite steel-concrete joints.
- Further research and application of RPC can lead to more efficient and durable infrastructure.
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