期刊
CEMENT & CONCRETE COMPOSITES
卷 90, 期 -, 页码 169-177出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.cemconcomp.2018.04.002
关键词
Magnesium potassium phosphate cement (MKPC); Fly ash (FA); Compressive strength; Water resistance; Microstructure
资金
- China Ministry of Science and Technology [2015CB655100]
- Hong Kong Research Grants Council [615810]
The ratio between fly ash (FA) and magnesia is an important factor for the optimum design of FA blended magnesium potassium phosphate cements (MKPCs). In this study, a high CaO content FA (CaO = 12.5 wt%) was used to partially replace magnesia at 0 wt%, 30 w%, 50 wt%, 70 wt%, and 90 wt%, respectively. The experimental results showed that a FA replacement of 50 wt% led to the highest compressive strengths. A FA replacement of 70 wt% is considered as upper limit, as the presence of more FA caused significantly lower strength. In the plain and the FA blended MKPCs, K-struvite (MgKPO4 center dot 6H(2)O) was the main hydrate. At very high FA contents, additional calcium potassium hydrogen phosphate (CaK3H(PO4)(2)) was observed as well as the destabilization of K-struvite to cattiite (Mg-3(PO4)(2)center dot 22H(2)O), which could be one of the main factors responsible for the lower strength of high FA blended MKPC mortars stored under water.
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