| 摘要 |
PURPOSE:To obtain a concrete product which has a small rate of shrinkage on drying and has no possibility of cracking by placing granular concrete of a low or zero fine aggregate percentage, subjecting this concrete to absolute drying after curing and impregnating an impregnating material therein. CONSTITUTION:The granular concrete which is extremely lowered in the fine aggregate percentage to about 4-9% or in which fine aggregate is not used is placed. After this placed concrete is cured, the concrete is dried to the absolute dry state or the state nearly equal thereto. The impregnating material is then impregnated in this concrete. The concrete product which hardly changes in volume after curing of the impregnating material is produced according to this process for production. The above-mentioned granular concrete has water permeability and there are many kinds of monomers which can be used; in addition, a wide range of materials to be used as the packing material are selectiable and since the mixing ratio is increased, the cost is reduced.
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