| 摘要 |
PROBLEM TO BE SOLVED: To prevent the separation of a mortar and a coarse aggregate by regulating a bulk density of the mortar obtained by removing the coarse aggregate from a composition comprising a cement, the coarse aggregate, a fine aggregate, water and various additives optionally added thereto so as to be the same as the density of the coarse aggregate. SOLUTION: The ratio of the bulk density of a mortar to the density of a coarse aggregate is preferably regulated so as to be 1.0-1.1, and the regulation is preferably carried out by regulating the density of the coarse aggregate, or regulating the density of the fine aggregate. The density difference between the mortar and the coarse aggregate is reduced by regulating the bulk density of the mortar so as to be nearly the same as the density of the coarse aggregate, and the separation of both of the mortar and the coarse aggregate is hardly caused even if the concrete composition is compacted while forcibly providing a vibrational energy thereto. In the case of highly fluid concrete with imparted self-filling properties hardly requiring the compaction, the separation of both of the components is hardly caused even if the fluidizing distance becomes long, and the concrete composition is loaded in a homogeneous state.
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