Abstract
Properties such as porosity, pore-size distribution, surface area and drying shrinkage are determined for silica fume-portland cement blends (0–30% silica fume) cured from 1 to 180 days at w/ (c+sf) of 0.25 and 0.45. Porosity was measured by helium, mercury and water techniques. It is shown that in paste blends a discontinuous pore structure is formed after as little as seven days of curing due to reaction of Ca(OH) 2 with silica fume. The pores are not so large as those in mortars owing to the lack of interface effects. Total porosities of the blends can only be measured by a water technique, whereas for plain cement pastes other techniques are applicable.
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