The dynamic behaviour of high-volume fly ash concrete with nano-silica (HVFANS) and polypropylene fibres at curing ages of 7 to 90 days was determined by using a split Hopkinson pressure bar (SHPB) machine. At each curing age. the concrete samples were laboratory tested at different temperatures conditions under strain rates reached up to 101. 42 s−1. https://allfixelectricales.shop/product-category/upper-sprayer-nut/