Foll0w-up survey for renewed external walls by application of net overlaying and anchoring

Abstract

Follow-up suvey for renewed external walls in housing building by application of net overlaying and anchoring has been carried out. The building has renewed 23 years ago. The suvey includes visual observations and pull-off test for applied materials. The results are as follows. (1) Tensile stregth average of applied filler is 18.5N/mm2 that is above tensile strength criteria of ceramic tile 0.4N/mm2. Furthermore, almost fracture position is cohesion failure in filler layer and it is considered that renewed layer adehesion is sufficient. (2) Tensile stregth average of applied anchoring pin is 7866N that is above tensile strength criteria of anchoring pin with injection hole 1500N. It is judged that anchoring deterioration with the passage of time has not been proceeded. (3) Maximum tensile strength of fiber net has been increased in comparison with the fiber net in storage and the elongation is decresed. Therefore, it is estimated that the fiber net would be brittle. However, it is considered that the fiber net is satisfied requirements in the renewal method. Based on above results, it is judged that the method is satified requirements in extrrnal wall renewal method.