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重庆科技学院高等教育自学考试本科毕业论文 英文摘要

宋体五号 The Title of the thesis

空一行

ABSTRACT Times New Roman三号加粗，居中

空一行

Due to lack of effective ways to utilize the bottom ashes of circulating fluidized bed combustion (CFB ashes), it is difficult to use widely the advanced technology of circulating fluidized bed combustion and defulfurization. In this paper, the properties of the CFB ashes are systematically analyzed and then a series of methods are proposed to evaluate the reactivity of CFB ashes. Meanwhile, the factors influencing and the method activating the reactivity of CFB ashes, and the expansion properties are investigated experimentally. The spontaneous setting, and the mechanism of activation of reactivity of CFB ashes and its expansion are investigated by XRD and SEM. Finally, the utilization in building materials of CFB ashes is studied.

The properties of CFB ashes show it is difficult to utilize CFB ashes in building materials, however reasonable using its properties is possible in building materials. As concrete fine aggregate, it can improve structure of interface between aggregates and cement paste for its reactivity, then can increase the concrete flexural strength. As concrete additive can fully activate the reactivity, and can partly compensate the concrete shrinkage. Because of performance of the fresh concrete and durability, it is better to use it with FA. They both influence performance of the fresh concrete. It can produce CFB ashes-fly ash mortar used indoors and CFB ashes-fly ash-clinker mortar used outdoors with low shrinkage by using the cement and expansion of CFB ashes. CFB ashes mixed with lime, FA or cement, can be used for roadbed mixture in road engineering.

Times New Roman小四号

Keywords： Circulating Fluidized Bed Combustion, CFB Ashes, Reactivity, Expansion,

Utilization in Building Materials Times New Rom小四号

Times New Roman加粗小四号

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