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To investigate the combined effects of micro-silica (MS) and nano-silica (NS) on the durability of concrete, an experimental program was launched, in which mortar mixes representing mortar portions of concrete with various water, MS and NS contents but a constant workability were made for strength, sulphate attack, carbonation, rapid chloride permeability and water absorption tests. It was found that the addition of MS and/or NS was effective in improving the durability of mortar. Moreover, for enhancing the strength, sulphate resistance and carbonation resistance, 1% NS was almost as good as 10% MS and the combined addition of MS and NS showed certain synergistic effects in the sense that the combined effects were larger than the respective sums of the individual effects. However, for enhancing the chloride resistance and water resistance, 1%–2% NS was less effective compared to 10% MS probably …