Application of Alkaline-resistant Glass Fiber in Road Concrete: Corrosivity and Applicability

Abstract

The main technical requirements of road concrete are high flexural strength and fatigue durability because shear failure is the major failure mode for road concrete. Adding glass fiber into concrete could greatly increase flexural strength and wearing resistance of concrete. However, glass fiber has the great potential of corrosion in the alkaline environment formed during the cement hydration, which will directly affect the long-term performance and strength stability. Systematic researches have been launched on the corrosion mechanism, surface treatment and anti-corrosion methods of fiber, however, few works have been made in the application and design method of alkaline-resistant glass fiber in road concrete. In this paper, the corrosion mechanism and property of alkaline-resistant glass fiber in cement paste were analyzed firstly, and the corrosion inhibition of active admixture on alkaline-resistant glass fiber was discussed. The practicability and applicability of alkaline-resistant glass fiber in road concrete were illustrated though the discussion of changing trend of flexural strength of cement paste mixed with different proportion of fly ash based on the experimental results, and the appropriate amount of activated additive of fly ash was also confirmed. The results suggested a prosperous application prospect for the application of alkaline-resistant glass fiber concrete with fly ash in road projects.