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缩机理的无收缩混凝土。一开始，我们计划用代表混凝土孔隙的模型通道来研究其机理，这种通道是用硬化镜像水泥浆体制备的。在上述研究中，证实了硬化后的水泥浆体或混凝土被压碎后，仅通过压实成型即可恢复强度。水泥浆体破碎后的压实物在大气中收缩，而干燥后的压实物在压缩前膨胀，其大小随干燥温度的变化而变化。上述结果表明，碾碎后适当干燥的混凝土可通过压实成型制备无收缩混凝土。

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.