Advantages of FRP High Strength Low unit weight High specific strength Corrosion resistance Used for more than 40 years
Major Disadvantage Low resistance to high temperature (fire) Fire hazard in transportation structures, 31% as compared to 37% flooding and 8% earthquake Restricted use in buildings Restricted use in tunnels Coef. of thermal expansion >> concrete Some high temp matrix is highly toxic
Applications of Inorganic Polymer in Civil Infrastructure Durable and fire resistant Strengthening; bricks, concrete, reinforced concrete Protective and graffiti resistant coatings Sandwich panels
Appearance of Inorganic FRP Compared to Organic FRP Organic FRP Inorganic FRP
Superior Properties of Geopolymer First: –Sets at room temperature; non toxic. Second: –higher heat tolerance. Third: –Geopolymers resist all organic solvents (and are only affected by strong hydrochloric acid).
Features of the Inorganic Matrix Polysialate (“Geopolymer”) Aluminosilicate Water-based, non-toxic, durable Curing temperature: 20, 80, 150°C Resists temperatures as high as 1000°C Protects carbon from oxidation