Abstract
To meet the growing requirements of global air transport, pavement materials with excellent dynamic bending performances are in demand. Meanwhile, replacing fresh water and river sand with seawater and sea sand in concrete helps preserve the environment and reduces concrete costs. In this study, the dynamic bending performance of seawater sea sand concrete (SSSC) mixtures incorporated with glass fiber (GF) and expansive agent (EA) were explored using a 100-mm diameter split Hopkinson pressure bar (SHPB) device. Modified sleeves were installed to perform three-point dynamic bending tests. Microstructures of the specimens were observed using scanning electron microscopy. Test results show that GF and EA worked synergistically to improve the dynamic bending performances of SSSC. Specimens incorporated with both GF and EA show stronger strain rate effects than SSSC specimens with GF or EA. The combined use of GF and EA apparently strengthened fiber-mortar interfaces and significantly enhanced specimen ultimate displacements at high strain rates.
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