Performance of Nanoparticles Combination (SiO2, Al2O3) on Highway Concrete Pavement

Abstract

Abstract Nano materials are being used in concrete technology to enhance the sustainability of performance grade for the pavement construction. In this paper, test investigations are conducted to study the addition effect of nanoparticles combination (Al2O3, SiO2) with the average diameter of 20 nm and with different acceptable percentages (Al2O3 : 0% and SiO2 : 0 %), (Al2O3 : 0.5% and SiO2 : 0.5 %), (Al2O3 : 0.5% and SiO2 : 1 %), (Al2O3 : 0.5% and SiO2 : 1.5 %), (Al2O3 : 1% and SiO2 : 0.5 %), (Al2O3 : 1.5% and SiO2 : 0.5 %) and (Al2O3 : 1% and SiO2 : 1 %) by weight of cement on the mechanical properties (compressive strength, flexural strength and modulus of elasticity) and the thickness design of concrete pavement. The optimal combination which contributed to the highest values of mechanical properties at (28) days in order to maintain the workability requirement of nano concrete mixes was found (Al2O3 : 1% and SiO2 : 0.5 %) which associated with the decrement in concrete pavement thickness, when all other factors were held constant. It is concluded that cement modification with nano particles (combination of SiO2 and Al2O3) increased compressive strength, flexural strength and modulus of elasticity though decreased concrete pavement thickness.