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

本研究的目的是开发基于干燥收缩机理的无收缩混凝土。最初，人们计划用模型通道来研究混凝土中的孔洞，这种通道是用硬化的镜面水泥浆体制备的。在上述研究中，证实了当硬化水泥浆体或混凝土被压碎时，它们只需压实成型即可恢复强度。压实水泥浆体在大气中收缩，而压缩前干燥的压实膨胀，其大小随干燥温度的变化而变化。上述结果表明，通过压实成型并适当干燥的混凝土可以制备无收缩混凝土。

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.