Influence of the composition of cement kiln dust on its interaction with fly ash and slag

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• 作者：Piyush Chaunsali ; Sulapha Peethamparan
• 关键词：Cement kiln dust (CKD) (D) ; X-ray diffraction (B) ; Scanning electron microscopy (B) ; Transmission electron microscopy (B)
• 刊名：Cement and Concrete Research
• 出版年：December, 2013
• 年：2013
• 卷：54
• 期：Complete
• 页码：106-113
• 全文大小：1455 K

文摘

Cement kiln dust (CKD), a by-product of the cement industry, contains significant amounts of alkali, free lime, chloride and sulfate. Wide variation reported in the chemical composition of CKDs limits their potential application as a sustainable binder component in concrete. In the current study, the performance of two different CKDs as components in a novel binder is evaluated. Several binders are developed by blending CKDs with fly ash or slag. Binders with 70% CKD were prepared at a water-to-binder ratio of 0.4, and heat-cured at 75 掳C to accelerate the strength development. The hydration progress was monitored using X-ray diffraction, and morphological examination was performed using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Ettringite and calcium aluminosilicate hydrate (C-A-S-H) were identified as the main hydration products in the hardened binder system. Strength development of CKD-based binder was found to be significantly influenced by its free lime and sulfate contents.