For the many kinds of concrete containing high-range water reducing and air-entraining agent comprised polycarboxylic ether system, with different mix-proportioning items, i.e. design slump, kind of cement, water-cement ratio and unit water content, slump retaining property, initial setting time and allowable period between concreting layers, which were determined by penetrating test, were measured under the various condition of kinds and quantity of workability retaining component. And it was cleared that relationships between allowable period between concrete layers and initial setting time, workability retention time and loss of slump after required time respectively and that the affection of concrete temperature for those properties.
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