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题名: Recycling of Sustainable Co-Firing Fly Ashes as an Alkali Activator for GGBS in Blended Cements
作者: Yann-Hwang Wu
Ran Huang
Chia-Jung Tsai
Wei-Ting Lin
贡献者: 國立臺灣海洋大學:河海工程學系
关键词: sustainable materials
co-firing fly ashes
GGBS
innovative alkali activators
日期: 2015-04
上传时间: 2018-10-05T07:47:52Z
出版者: Materials
摘要: Abstract: This study investigates the feasibility of co-firing fly ashes from different boilers, circulating fluidized beds (CFB) or stokers as a sustainable material in alkali activators for ground granulated blast-furnace slag (GGBS). The mixture ratio of GGBS and co-firing fly ashes is 1:1 by weight. The results indicate that only CF fly ash of CFB boilers can effectively stimulate the potential characteristics of GGBS and provide strength as an alkali activator. CF fly ash consists of CaO3 (48.5%), SiO2 (21.1%), Al2O3 (13.8%), SO3 (10.06%), Fe2O3 (2.25%) and others (4.29%). SA fly ash consists of Al2O3 (19.7%), SiO2 (36.3%), Fe2O3 (28.4%) and others (15.6%). SB fly ash consists of Al2O3 (15%), SiO2 (25.4%), Zn (20.6%), SO3 (10.9%), Fe2O3 (8.78%) and others (19.32%). The mixtures of SA fly ash and SB fly ash with GGBS, respectively, were damaged in the compressive strength test during seven days of curing. However, the built up strength of the CF fly ash and GGBS mixture can only be maintained for 7–14 days, and the compressive strength achieves 70% of that of a controlled group (cement in hardening cement paste). The strength of blended CF fly ash and GGBS started to decrease after 28 days, and the phenomenon of ettrigite was investigated due to the high levels of sulfur content. The CaO content in sustainable co-firing fly ashes must be higher than a certain percentage in reacting GGBS to ensure the strength of blended cements.
關聯: 8(2) pp.784-798
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50367
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