中文摘要：

目的研发一种常温下可制备、且无需碱活化的生态型纯粉煤灰水泥（EPFC）,验证其具有与325R普通硅酸盐水泥相当甚至某些指标超出325R的使用性能.方法采用扫描电镜（SEM）、能量色散谱分析（EDS）、X射线衍射分析（XRD）等手段对原材料和不同龄期的生态型纯粉煤灰水泥开展微观分析,初步确定其水化机制、水化过程等微观工作机理;对EPFC试件进行抗压强度试验,氯离子渗透性能试验,干密度、塌落度、硬度和弹性模量试验,分析其宏观性能.结果粉煤灰中CaO含量较低,会降低溶液中Ca2＋和OH-的浓度,降低pH值,造成粉煤灰中的硅酸盐溶解通常较慢,因此EPFC在超出28 d养生龄期后的一年内还有强度增长.EPFC水化过程非常复杂,水化产物包括氢氧化铝,C-S-H,M-A-S-H和C-A-S-H.EPFC的高早强是因为粉煤灰主要由无定形的富Al富Ca相和石英的结晶相、赤铁矿、游离石灰、方镁石和氧化铝组成.结论 EPFC具有高早强和低密度的特点,可作为快速修补材料以及轻型混凝土原材料混凝土原材料.

英文摘要：

A newecological pure fly-ash cement was developed at room temperature without alkali activation,which is proved has equivalent performance compared with 325R portland cement,as well as its potential to be a desirable binder for.fire-resistant concrete,lightweight concrete,and fast repairing cement.By means of ESM,EDS,and XRD etc,microcosmic tests were carried out toidentify the micro information of this green material;microcosmic working mechanism such as hydration process and hydration mechanism were elucidated based on these test results.The content of CaO in fly ash is relatively low,which would reduce the concentration of Ca2＋ and OH- in the solution,as well as the value of pH,so the strength of EPFC keeping growing beyond the 28 d curing period.The hydration process of EPFC is very complex,and the hydration products include aluminum hydroxide,C-S-H,M-A-S-H and C-A-S-H.The reason of high early strength of EPFC is that the crystallization of fly ash is mainly composed of amorphous Al rich phase and Ca rich phase and quartz hematite,free lime,magnesia and alumina.EPFC can be used as fast repair materials and light concrete raw materials because which has the characteristics of high early strength and low density.