This paper provides an overview of the effects of ripening the olivine nano-silica to form particles with a
lower specific surface area for optimal use in high performance concrete. The nano-silica was ripened using a
hydrothermal treatment in a mixed batch reactor at 90 °C, pH ranging from 8 to 10 and a silica weight percentage of three and six percent. The specific surface area of the olivine nano-silica can be reduced by
62 percent by Ostwald ripening in 22 hours. This reduction corresponds to a 80 percent drop of the micropore
surface area and a 57 percent drop of the external surface area. The different hydrothermal conditions did not
affect the final specific surface area at the equilibrium. However, the use of a high energy mixer reduced the
specific surface area by 52 percent in only five minutes. Despite the reduction in specific surface area, the aggregates of the original olivine nano-silica are not dissolved during the ripening process.
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