52 An Investigative Study on the Effects of Nano-SiO2 on Compressive Strength and Permeability of Concrete Available to Purchase

Cement is the substance which holds concrete together, i.e. it is extremely widely used in civil projects. Consequently, application of nano-materials into the production of cement and concrete can lead to improvements in sustainable engineering because the mechanical strength and life of concrete structures are determined by the micro-structure and by the mass transfer in nano-scale. Nano-SiO2 in many countries is produce in industrial scale these days. So, this paper is going to evaluate the compressive strength and the permeability of nano-SiO2 stabilized concrete samples. The Critical Voltage Method (CVM) was used to investigate the later property; So 6 mix designs with different nano-SiO2 percents were tested. The results showed that by increasing the nano-SiO2 content, the electrical resistance of concrete is increased. So, nano-SiO2 can improve the water permeability resistance of concrete. The same concept was occurred for the compressive strength.