Enhancing Fire Resistance Performance of Precast Concrete Load- Bearing Walls by Using Polypropylene Fibers and Wire Mesh

摘要

The use of polypropylene (PP) fibers and wire mesh is investigated in this study to enhance the spallingrnresistance of precast concrete load-bearing walls exposed to fire. A series of fire tests are carried out onrnprecast concrete load-bearing walls with varying proportions of PP fibers in the concrete mixture inrnconjunction with the installation of wire mesh using 15 mm concrete cover. The walls are exposed to ISOrn834-1 standard fire on one side for the target heating duration of 180 min. Based on the experimentalrnresults, it can be concluded that the use of PP fibers of 0.05-0.2% by volume in the concrete mixture canrneffectively increase the spalling resistance of precast concrete load-bearing walls, while the installation ofrnwire mesh has a negative impact on the walls’ fire-resisting performance. Furthermore, the use of wirernmesh in conjunction with PP fiber does not enhance the spalling resistance of the concrete walls, comparedrnwith using PP fiber alone.