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Characteristics of Interfacial Shear Bonding Between Basalt Fiber and Mortar Matrix
Li Hong1,2,3, Tadan Li1, Yadi Chen1
1Department of Structural Engineering, Hefei University of Technology, Hefei 230009, China.
Materials (Basel, Switzerland)
|November 13, 2020
Summary
Basalt fibers enhance concrete strength, with bonding influenced by embedment length and mortar strength. Despite PVA fibers showing higher initial bonding, basalt fibers proved most effective in reinforcing fiber-reinforced concrete (FRC).
Area of Science:
- Materials Science
- Civil Engineering
- Composite Materials
Background:
- Basalt fibers are increasingly used as concrete reinforcements due to their durability, cost-effectiveness, and eco-friendly properties.
- Understanding the fiber-matrix interface is crucial for optimizing the reinforcing efficiency of basalt fibers in concrete.
- Limited research exists on the specific bonding characteristics of basalt fibers within a mortar matrix.
Purpose of the Study:
- To investigate the interfacial bonding behavior of single basalt fibers pulled from a mortar matrix.
- To compare the pull-out performance of basalt fibers with polyvinyl alcohol (PVA) and glass fibers.
- To evaluate the impact of interfacial bonding on the mechanical properties of fiber-reinforced concrete (FRC).
Main Methods:
- Conducted single fiber pull-out tests using basalt, PVA, and glass fibers embedded in mortar.
- Varied embedment lengths and mortar strengths to assess their influence on bond behavior.
- Measured the tensile and compressive strengths of fiber-reinforced concrete (FRC) specimens.
Main Results:
- Average bond strength, rather than shear bond strength, effectively characterizes the interfacial bond of basalt fibers in mortar.
- Increased embedment length and higher mortar strength significantly improved the bond strength of basalt fibers.
- While PVA fibers exhibited the highest shear bond strength, basalt fibers demonstrated superior reinforcing efficiency in FRC.
Conclusions:
- The interfacial bond strength of basalt fibers in mortar is positively correlated with embedment length and mortar matrix strength.
- Basalt fibers offer the best reinforcing efficiency for fiber-reinforced concrete (FRC) despite not having the highest initial interfacial shear bond strength.
- This study provides valuable insights for optimizing the use of basalt fibers in construction applications.
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