Influence of SO_3 from CFBC Coal Ash on Setting Time of Cement

【Author】

Wenshang Zhu;Bilan Yan;Lizhen Jiang;Lan Wang;

【Abstract】

<正>As the Circulated Fluidized Bed Combustion(CFBC) coal ash has high SO_3 content, when used as cement admixture with gypsum,the SO_3 content in cement easily goes beyond the limit.By 3 CFBC coal ash samples,this paper respectively studied the clinker setting time influence caused by 30%CFBC coal ash and 30%CFBC coal ash added anhydrite or gypsum.The results showed that 30%CFBC coal ash was added to the clinker directly,if the SO_3 content in cement was more than 1.50%,the setting time satisfied the standard request,if not,the setting time was short,by adding some anhydrite or gypsum additionally,and the setting time was qualified.

【Keywords】

CFBC coal ash;;clinker;;gypsum;;anhydrite;;setting time

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