抄録
It is a hard work to produce the bending strength test specimen of extremely stiff consistency concrete for roller compacted concrete pavement. The purpose of this study is to reduce the work time of the specimen production. In order to carry out this purpose, superplasticizer was added to the base concrete after mixing. The consistency was measured by a Swedish-type Vebe apparatus and the vibrating compaction value of the base concrete was 50±5 seconds.
The suitable superplasticizer content was found to be 1.2% by cement content. By adding superplasticizer suitably to the base concrete, the vibrating compaction value and air content were decreased considerably and the compaction ratio was increased slightly. Furthermore, the surface vibrating compaction time to produce test specimens and the time to finish concrete surface by trowel could be reduced to half and one-eighth respectively, the surface finish condition was well and smooth enough, and the bending strength of the superplasticized concrete was equal to that of the base concrete at the age of 28 days. From these results, the work time to produce test specimens is reduced by adding superplasticizer.
