Effect of nano silica on the physical property of porous concrete pavement

Abstract

Rice husk can be categorized as an organic waste material from paddy industries. Silica is a major inorganic element of the rice husk. The aim of present study is to evaluate the effect of nano silica (NS) on the physical properties of porous concrete pavement. Rice husk has been burned in the furnace (650°C for 6 hours) and ground for four different grinding times (33, 48, 63 and 81 hours). Five types of mixes were prepared to evaluate the different NS grinding time. A NS dosage of 10% by weight of binder was used throughout the experiments. The physical properties were examined through compressive strength, transmission electron microscopy (TEM) and x-ray fluorescence (XRF). The experimental results indicate that the different nano size gives a different effect to porous concrete strength. Based on the results obtained, NS ground for 63 hours (65.84nm) gives the best result and performance to porous concrete pavement specimens.