The low activity of waste cementitious powder from construction and demolition waste (CDW) is the main reason that limits its application in cementitious materials, and thus, this work investigates the utilization of thermal activation treatment in improving the properties of waste cementitious powder and its newmade mortar. The un-treated waste powder mainly consists of inert hydrated products, quartz or calcite, and new active components are formed in thermal-activated waste powder, and the utilization of thermal-activated waste powder promotes the hydration reaction of new cementitious materials. The waste powder has an irregular micro-structure, but it becomes smooth after 1200 °C activation. When the thermal activation temperature on waste powder is 600–800 °C, the properties of mortar including thermal-activated waste powder are better than those of mortar with un-treated waste powder, and specifically, the activity index of waste paste powder ranges from 71.7% to 90.1% when the activation temperature ranges from 20 °C to 600 °C. But the properties of mortar including 1200 °C thermal-activated waste powder are generally inferior to those of mortar with other thermal-activated waste powders. The 600–800 °C thermal-activated temperature is suggested to improve the properties of waste cementitious powder by taking energy consumption and thermal-activated efficiency into consideration. And although higher than untreated waste powder preparation, the costs and energy consumption for preparing thermal-activated waste powder still has advantages in contrast with cement preparation. Replacing partial cement with thermal-activated waste powder in new cementitious materials is feasible and beneficial.

【摘要】：建筑拆迁废料(CDW)废胶凝粉活性低是限制其在胶凝材料中应用的主要原因,因此,本工作研究了热活化处理在改善废胶凝粉性能及其新制备中的应用。砂浆。未经处理的废粉主要由惰性水合产物、石英或方解石组成，热活化废粉中形成新的活性成分，热活化废粉的利用促进了新型胶凝材料的水化反应。废粉具有不规则的微观结构，但经过1200°C活化后变得光滑。当废粉热活化温度为600～800℃时，含有热活化废粉的砂浆的性能优于含有未处理废粉的砂浆，具体而言，活化温度为20℃～90.1％时，废糊粉的活性指数为71.7%～90.1%。 600℃。但含有1200℃热活化废粉的砂浆的性能普遍不如含有其他热活化废粉的砂浆。考虑到能耗和热活化效率，建议采用 600-800 °C 的热活化温度来改善废弃胶凝粉的性能。并且虽然比未经处理的废粉制备高，但制备热活化废粉的成本和能耗与水泥制备相比仍然具有优势。