Development of non-shrinkage concrete based on the shrinkage mechanism studied with nano-sized channels

本研究的目的是根据干燥收缩机理开发无收缩混凝土。起初，计划用代表混凝土中孔隙的模型通道来研究机理，这种通道是用硬化镜像水泥浆制备的。在上述研究中，证实了当硬化的水泥浆或混凝土被破碎时，它们仅通过压实成型而恢复强度。水泥石压坯在大气中会发生收缩，而干燥后的压坯则会发生膨胀，且膨胀幅度随干燥温度的变化而变化。试验结果表明，将混凝土粉碎后适当干燥，经碾压成型可制备出无收缩混凝土。

The objective of this research is to develop non-shrinkage concrete based on the mechanism of drying shrinkage. In the beginning, it was planned to study the mechanism with model channels which represents the pore in concrete, such channels are prepared with hardened-mirrored cement paste. In the above study, it was confirmed that when hardened cement paste or concrete are crushed, they regain the strength by just compaction molding. The compacts of crushed cement paste shrink in the atmosphere, however, the compacts of dried before the compression expanded and the magnitude changed by the drying temperature. The above results indicates that the non-shrinkage concrete can be prepared by the compaction molding of crushed and appropriately dried concrete.