LCP fiber-reinforced cementitious composites (LCP-FRCC): Mechanical and morphological characteristics

Reinforced concrete structures often suffer durability degradation issues in high-humidity or aggressive environments because cracking and moisture ingress can accelerate reinforcement corrosion and shorten service life. Improving crack control and ductility has therefore become a key objective in the development of fiber-reinforced cementitious composites (FRCC). To meet engineering requirements for lightweight, high-toughness, and durable materials, extensive research has been conducted on different ECC systems. Fibers such as polyvinyl alcohol (PVA), polyethylene (PE), polypropylene (PP), and aramid fibers continue to attract significant attention. However, the performance of high-strength, high-modulus, hydrophobic liquid crystal polymer (LCP) fibers in cementitious composites remains insufficiently understood. To address this issue, this study investigates LCP fiber-reinforced cementitious composites (LCP-FRCC). LCP fiber contents of 0%, 0.5%, 1.0%, 1.5%, and 2.0% were examined under the same mix proportions. Mechanical properties, including compressive, flexural, and tensile strengths, were measured at different curing ages. Microstructural analysis using SEM and CLSM was conducted to observe fiber distribution and interfacial bonding with the matrix. The results show that LCP fibers can enhance the strength and fracture elongation in cementitious matrices. These findings provide a basis for the engineering application of LCP-FRCC and a practical reference for subsequent FRCC mix design.