ABSTRACT
ABSTRACT: Utilising industrial by-products in the construction industry is an essential approach in the development of sustainable construction. Experimental research has been carried out to investigate the feasibility of utilising industrial by-products such as fly ash and silica fume in the production of a more environmentally friendly shotcrete by reducing the material rebound and generating a less dusty shooting environment. Polypropylene fibre (PPF) reinforced concrete mixes were initially optimised and investigated in a preliminary laboratory phase. The optimised mixes were used to produce shotcrete panels using the dry-mix process. The total material rebound was measured and samples were taken from the rebound and in-situ shotcrete for composition analysis. The effects of PPF, fly ash and silica fume on the total rebound material and the composition of the rebound and in-situ shotcrete were investigated. The results show that the use of fly ash and silica fume can benefit the environment when used as replacement for Portland cement and also effectively reduces the shotcrete material rebound and offer a less dusty shooting environment.
