investigation of effect of nano-sio2consumption in concrete on its environmental and economic functions

concrete is one of the most utilized construction materials in the world. nowadays, nano silicate usage due to its special property attracted considerable attention. on this basis, studying its environmental functions is an essential issue. accordingly, the behavior of normal concrete and the one with nano silicate were compared via taking advantage of life cycle assessment (lca) method in this investigation. in addition, due to astm recommendation, the abovementioned method was utilized to compare these two concrete mixtures economically, too. concluding the outcomes, the economic and environmental assessments were mixed via multi-criteria decision-making method. reducing environmental impacts via substitution of cement with 1.5% nano silicate, global warming criterion and fossil fuel consumption have been reduced 26.5 and 10.88 percent, respectively. having the same substitution in concrete production, economic assessment indicates 10% reduction in life cycle expenses for this mixture. the mixture assessments for both normal and mixture with nano silicate concrete ranked them 47.6 and 52.8, respectively.