Preliminary Study on the Use of Recycled Glass, Ceramics, and Granite as Fillers in Ultra-High Performance Fiber Concrete

Waste recovery and environmental protection and the production of low-cost UHPFC are the most trends areas of current researchers. Ultrafine (silica fume) is the basic component of ultra-high-performance fiber concrete (UHPFC), which is very sophisticated and its manufacture is limited by the capacity of some industries. This work, which falls within this context, aims to recover waste (glass, ceramics, and granite) as recycled fillers partially substituted silica fumes in the composition of the UHPFC. The study consists of two parts, the first is to find a formulation based on local materials, the second is to replace the silica fumes by recycled fillers with the percentage of 10% and 20%. The tests carried out on the fresh state mixtures are density, workability and occluded air, and on hardened state are the compressive and flexural tensile strength, sclerometer, ultrasound regarding untreated concrete, and the performance in compressive and tensile strength concerning the concrete heat treated at 90 degrees C, as well as durability parameters (water absorption and chlorides penetrations). The results show that recycled ceramic fillers and 20% of the recycled granite fillers present an acceptable compressive strength, the recycled fillers increase the flexural tensile strength of the UHPFC and the heat treatment improves the mechanical strength. Recycled fillers affect sustainability parameters.