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are discussed. By use of a survey, moreover, the data for the reasonable uses are prepared.
Silica is used for tile cement, grouting, mortar to repair, high performance concrete, etc in construction fields. Though Silica is more expensive than general sand, it is often used in repairing construction because it is pure as well as homogeneous and a prompt action is necessary during the polymer cement mortar or high performance mortar for grouting construction. As there aren't enough data of silica which is used for the construction fields, it is impossible to prospect about the vision of silica. So it is necessary to take statistics on the silica for the construction fields. Though each company has produced some silica which is sorted by sizes of particle, the particle sizes are not unified. As a result, it is necessary to make the unified silica standards for reasonable uses.