废弃混凝土再生水泥熟料的配制与性能

Manufacture and Property of Recycled Cement Clinker by Demolition Concrete

以完全不用天然石灰石、粘土、页岩和砂岩,废弃混凝土在生料中的质量百分含量高达95%～99%和普通煅烧工艺制备出了水泥熟料(以下简称再生熟料)。将再生熟料与用天然石灰石和砂岩制备的水泥熟料进行了对比试验与分析,结果表明:2种熟料具有完全相同的XRD特征峰位,再生熟料的熟料矿物形成正常;2种熟料化学成分相近,再生熟料的率值设计中更倾向于高钙低硅;再生熟料的f-CaO含量满足安定性要求;再生熟料制备的水泥的3d强度达到42.5级硅酸盐水泥的要求,28d强度达到52.5级硅酸盐水泥的要求。

Without natural lime stone,clay,shale and sandstone,with the mass fracrion of demolition concrete in raw meal up to 95%~99%,along with ordinary calcining process,the cement clinkers（hereinafter called recycled clinkers for short） were produced.Experiments and analysis were employed to compare these recycled clinkers with the cement clinker which was manufactured by natural lime stone and sandstone.It is shown that the two types of clinkers have completely the same positions of characteristic peaks of XRD;the clinker minerals of recycled clinkers are formed normally;the two clinkers have similar chemical composition,and the rate value design of recycled clinkers are more likely to higher calcium and lower silicon;the content of f-CaO of recycled clinkers meets the requirements of soundness;the 3d strength of cements produced by recycled clinkers reaches the requirements of 42.5 grade Portland cement,and the 28d strength reaches the requirements of 52.5 grade.