Investigation on Flexural Behavior of Geopolymer-Based Carbon Textile/Basalt Fiber Hybrid Composite

• Published in: Polymers Vol. 13; no. 5; p. 751
• Main Authors: Le, Chi Hiep, Louda, Petr, Ewa Buczkowska, Katarzyna, Dufkova, Iva
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 28-02-2021; MDPI
• Subjects: Basalt; Carbon; carbon textile; Cement; Charpy impact strength; Charpy impact test; chopped basalt fibers; Concrete; Crack propagation; Debonding; failure mode; Failure modes; Flexural strength; Geopolymers; Grain size; Hybrid composites; Impact strength; Interfacial bonding; Mechanical properties; Performance evaluation; Raw materials; Reinforced concrete; Tensile strength; textile-reinforced geomortar; Textiles; Workability; Czech Republic; Charpy impact strength; flexural strength; chopped basalt fibers; failure mode; carbon textile; textile-reinforced geomortar
• ISSN: 2073-4360; 2073-4360
• DOI: 10.3390/polym13050751

This paper presents an experimental research on the mechanical properties of the hybrid composite thin-plates of the short basalt fibers (CBFs)/carbon textile-reinforced geomortar. The effect of fiber contents and lengths of CBFs on the flexural behavior of carbon textile-reinforced geopolymer specimens (TRGs) was investigated by the four-point flexural strength and Charpy impact test. The experimental results of hybrid TRGs, on the one hand, were compared with reference TRGs, without CBF addition; on the other hand, they were compared with the results of our previous publication. According to the mixing manner applied, fresh geomortar indicated a marked reduction in workability, increasing the CBF loading. Furthermore, using CBFs with lengths of 12 mm and 24 mm makes it easy to form the fiber clusters in geomortar during mixing. According to all the CBF loadings used, it was found that TRGs showed a significant improvement in both static and dynamic flexural strength. However, the failure mode of these TRGs is similar to that of the reference TRGs, described by the process of fiber debonding or simultaneously fiber debonding and collapse. In comparison with our prior work results, neither the CBF dose levels nor the fiber lengths used in this work have yielded a positive effect on the failure manner of TRGs. According to the results of the Charpy impact test, this reveals that the anchoring capacity of textile layers in geomortar plays an important role in specimens' strength.