垃圾焚烧飞灰煅烧阿利尼特水泥熟料的形成过程及其水化性能研究

以城市垃圾焚烧飞灰(以下简称焚烧飞灰)为主要原料,在实验室电炉里成功研制了阿利尼特水泥熟料。本文主要研究水泥熟料煅烧形成过程及其水化性能,分析了阿利尼特水泥的适宜石膏掺量、水化放热特征、水化产物及其显微结构。研究结果表明:利用垃圾焚烧飞灰为主要原料可以成功烧制阿利尼特水泥熟料,煅烧过程中首先出现C2S、C12A7和C2S·CaCl2,随后与MgO和CaCl2反应生成阿利尼特;掺加5%二水石膏可以促进阿利尼特水泥水化,较普通硅酸盐水泥更快,阿利尼特水泥可以作为一种早强快硬型水泥使用;阿利尼特水泥主要水化产物除含有硅酸盐水泥中常见的CSH凝胶、棒状AFt和Ca(OH)2晶体外,还含有C3A·CaCl·210H2O晶体。

Hydration Characteristics and Formation Progress of Alinite Cement Prepared from Mswi Fly Ash

Municipal Solid Waste Incineration （MSWI） fly ash was successfully used as raw material in sintering Alinite cement clinker in the laboratory. In this paper, formation progress of Alinite cement clinker, influence of gypsum on the hydration of alinite cement, hydration heat release rate, hydration product and its microstructure were studied. Results show that Alinite cement clinker can be sintered by using MSWI fly ash as a major raw material. During the sintering, C2S, C12A7 and C2S·CaCl2 was presented first,then make alinite cement clinker when react with MgO, CaCl2. Addition appropriate amount of gypsum can improve the early compressive strength and accelerate the hydration rate of Alinite cement, and the Alinite cement can be utilized as a kind of early-strength and rapid-hardening cement; Hydration product of Alinite cement not only includes CSH gel, AFt with clavate shapes and CH crystals which can be observed in Portland cement, but also has C3A·CaCl2·10H2O crystals.