期刊
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
卷 97, 期 3, 页码 929-937出版社
WILEY
DOI: 10.1111/jace.12751
关键词
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资金
- Spanish Ministry of Science and Innovation [BIA 2010:17530]
- JAE-Post doc scholarship
- European Social Fund
A study examining the complex hydration chemistry of a hybrid alkaline cement containing a high content of coal bottom ash (BA) (>70%) and a low content of portland cement clinker in the presence of an alkaline activator is presented. The use of a water reducing additive was found to significantly delay the overall hydration process, allowing an opportunity to more clearly distinguish the hydration reactions that take place. The results presented showed that both the cement clinker phases and the ash glassy phases are highly reactive for the first 3d of hydration. In situ formed reaction products portlandite and gypsum were shown to be metastable and had disappeared within 3d of hydration. Ettringite stability was limited in the hybrid system but unlike gypsum and portlandite, remained detectable for the first 3d of hydration at least. SEM-EDX and subtracted Fourier transform infrared evidence suggest the development of three different gel bond environments, tentatively attributed to C-(A)-S-H, C-A-S-H, and (N,C)-A-S-H type gels.
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