BEHAVIOR OF GLASS FIBER GEOPLOYMER BUBBLE SLABS EXPOSED TO FIRE FLAME

In the present study, eight specimens of Reinforced concrete Geopolymer bubbled slab exposed to fire flame and tested under punching shear failure with dimensions (45*45*7 cm), steel armature (Ø3@25), plastic ball diameter (4 mm) and concrete cover (1.5 cm) and the use of two percentages of fiberglass (0.5%-1%) and the variable temperatures were (150- 300- 450 ˚C) with a burning time of 30 minutes. From the results of laboratory tests, when the Geopolymer reinforced concrete bubbled slabs exposed to high temperatures, it did not occur to spalling, and the reason for that is that Geopolymer concrete has the ability to resist heat due to the fact that it's main compounds are materials burned at high temperatures. And also, it was noticed in examining a punching shear stress of the models with fibers (0.5%) that the ultimate load increased by (4.5%) for the model burned at a temperature of (150 ˚C) and a decrease in the ultimate load was (40%) for the models burned at temperatures (300 ˚C) and a decrease in the ultimate load by (30%) for the models burned at temperatures (450 ˚C). Also, it was noticed in examining a punching shear stress of the models with fibers (1%) that the ultimate load increased by (6%) for the model burned at a temperature of (150 ˚C) and a decrease in the ultimate load was (36%) for the models with temperatures (300 ˚C) and a decrease in the ultimate load by (27%) for the models burned at temperatures (450 ˚C).

Monitoring the Degradation of UHPC Boards

In this article the hot water test is presented on thin UHPC slabs that are reinforced by a new type of armature. It is a textile armature, which should replace the classic metal (steel) armature. Textile armature should not only reduce the cost of production, but, because it is not susceptible to corrosion as conventional steel armature, panels can be designed with significantly less cover thickness in achieving similar or longer lifetime of these elements. The combination of UHPC concrete with a minimum thickness of cover and textile armature allows design elements weighing up to 70 % lower compared to conventional concrete elements with conventional armature. This can achieve significant savings and benefits not only in economic aspects, but also in environmental aspects.

To Monitoring the Degradation of UHPC Boards with Textiles Armatures

In this article the hot water test is presented on thin UHPC slabs that are reinforced by a new type of armature. It is a textile armature, which should replace the classic metal (steel) armature. Textile armature should not only reduce the cost of production, but, because it is not susceptible to corrosion as conventional steel armature, panels can be designed with significantly less cover thickness in achieving similar or longer lifetime of these elements. The combination of UHPC concrete with a minimum thickness of cover and textile armature allows design elements weighing up to 70 % lower compared to conventional concrete elements with conventional armature. This can achieve significant savings and benefits not only in economic aspects, but also in environmental aspects.