Snow-Proof Roadways Using Steel Fiber-Reinforced Fly Ash Geopolymer Mortar-Concrete

Geopolymer composite is an innovative and ecofriendly construction material and an alternative to portland cement. Geopolymer concrete is a multifunction material that can be used for different purposes. One of the applications that recently has attracted attention is in snowproof roadways. This paper studied the compressive strength and stiffness of fly ash-based geopolymer with different volume percentages of 0.5-in.-long (12.7 mm) steel-fiber reinforcement at different curing conditions. The formed geopolymer concrete was analyzed through compression testing, scanning electron microscopy (SEM) microstructural analysis, and measurement of electrical conductivity. The results showed that the fly ash-based geopolymer mortar can greatly improve the compressive strength and electrical conductivity by using a small amount of steel fibers. Curing at elevated temperatures for the first 24 h increased the geoploymer's strength and stiffness. With improved mechanical properties and electrical conductivity, the developed geopolymer concrete could be used as a pavement material for snowproof roadways. Improved electrical conductivity can increase the heat generated in geopolymer through electricity and help to accelerate snow melting. Steel-fiber reinforcement enhances the geopolymer's stiffness and strength and makes the geopolymer material satisfactory for the construction requirements for pavements. (C) 2020 American Society of Civil Engineers.

Automated summary

Geopolymer composite, as an innovative and eco-friendly construction material, has various uses, including snowproof roadways. Adding a small amount of steel fibers can greatly enhance its compressive strength and electrical conductivity, while curing at elevated temperatures for the initial 24 hours improves its mechanical properties.