| dc.description.abstract | Reutilizing the bottom ash has become the future trend. Due to the characteristics of the bottom ash, in the cement products making process, it often retards the cement setting or causes volume expansion. Therefore it is considered necessary to pre-treat bottom ash. The study includes three parts: (1) the establishment of the water-wash parameters; (2) comparison of fundamental properties, and (3) reuse assessment.
The experiment resulted in the following conclusions. First, water-washing can reduce the amount of water soluble chlorine ion in the bottom ash. Secondly, water-wash efficiently increases with L/S ratio. Third, multi-stages water-wash is a better process than single batch one. Based on the fundamental property Testes, after processing water-washing, bottom ash has shown observable improvement on its engineering property, such as reduction of the absorption, the abrasion rate, and content of organic matter.
The CLSM mixing design test had shown that the CLSM produced with water-washed bottom ash meets the standard of general-type CLSM. However, in order to meet the standard of early-strong-type CLSM, adding admixtures is considered necessary. In addition, the result of the study shows that adding sodium silicate and sodium hydroxide in the process, greatly shortens the setting time of CLSM. | en_US |