Properties of Fresh and Hardened Glass Fiber Reinforced Fly Ash Based Geopolymer Concrete

This paper evaluates the effects of glass fiber addition on the properties of fresh and hardened fly ash based geopolymer concrete (GPC) activated by 8 M NaOH solution (28.6%) + Na2SiO3 (71.4%) with a SiO2/Na2O ratio of 2.0. Glass fibers at the dosages of 0.50%, 0.75%, 1.00% and 1.25% by volume of concrete were added to the GPC mix. The properties of fresh and hardened glass fiber reinforced fly ash based GPC in terms of workability, density, compressive and flexural strengths were compared with those of the fly ash based GPC without using glass fiber. The experimental results indicated that inclusion of the glass fibers resulted in decrease of the workability but increase of the density, compressive and flexural strengths of the fly ash based GPC with increased fiber content.

Performance of Protective Doors and Windows under Impact and Explosive Loads

Experimental bullet-proof investigations for two types of steel protective doors under comparative perforation tests using various bullets shot from short and long typical fire-arms are presented. Protective windows are tested under soft impact of 30 kg mass and under aerial shock wave from explosion of an explosive blowing charge (aluminum cash desk windows) and a fuel-air mixture (steel protective windows of warship). The structural material of door leaves used is Polish standard building steel, while the window leaves - Polish architectural protective glass of P4A class in cash desk windows and duplex hardened glass in warship windows.