An Experimental Study on the Abrasion Resistance of Pervious Concrete Containing Nano SiO2 in pavement

Pervious concrete is increasingly used in the pavements and overlays subjected to heavy traffic and in cold weather regions. Typically, pervious concrete has little or no fine aggregate and has just enough cementitious paste to coat the coarse aggregate particles while preserving the interconnectivity of voids. In the present study, effect of nano silica additives on pervious concrete abrasion resistance is investigated. Five samples indicate the PPC, PCNS1, PCNS3, PCNS5 and PCNS7, which respectively represent plane pervious concrete, pervious concrete containing nano silica in the amount of 1%, 3%, 5% and 7% by weight of binder, have been evaluated. A total of 30 samples were prepared which 15 samples for testing compressive and 15 cubic cubes was for wear resistance. The results indicate that by increasing the use of nano silica in pervious concrete, compressive strength and abrasion resistance were also increased. The concrete containing nano silica in the amount of 5 % by weight of binder has the best abrasion resistance performance. Use of nano silica in the amount of 5% has a very good influence in enhancing abrasion resistance and compressive strength about 48% and 28% respectively. Other studies on microstructures between the cement mortar mixed with the nano-particles and the plain cement mortar showed that the nano-silica filled up the pores and reduced CaOH2 compound among the hydrates. Finally, the relationship between the indices of abrasion resistance and compressive strength of concrete is obtained, which indicates that the abrasion resistance of concrete increases with increasing compressive strength.