Orthogonal experimental study on hybrid-fiber high-durability concrete for marine environment

Abstract

In this study, hybrid-fiber high-durability concrete (HFHDC) for marine environment is developed by the orthogonal test, the effects of various factors on the performance of HFHDC were studied. The results show that the content of basalt fiber (BF), polypropylene fiber (PF), and water binder ratio have a significant impact on the slump of concrete. The water binder ratio has a significant impact on the compressive strength, whereas the influence of BF content on compressive strength decreases with the increase of concrete matrix strength. The water binder ratio and silica fume content have a significant impact on the electrical flux of concrete. By comparing the performance of HFHDC determined by range method, variance method and efficiency coefficient method, it is found that the concrete determined by efficiency coefficient method meets the requirements of construction performance and strength. It can be better applied to engineering structures in marine environment with excellent resistance to chloride ion penetration. Moreover, mineral admixtures can optimize the microstructure of concrete through the activity effect and micro-aggregate effect, while the addition of hybrid fibers can improve the compactness of concrete, cut off the connected pores in concrete, inhibit the expansion of concrete cracks, and improve the impermeability of concrete.

Keywords

• Hybrid-fiber high-durability concrete
• Basalt fiber
• Polypropylene fiber
• Orthogonal experiment
• Permeability analysis