کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7884696 | 1509715 | 2018 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Reaction mechanism of magnesium potassium phosphate cement with high magnesium-to-phosphate ratio
ترجمه فارسی عنوان
مکانیسم واکنش سیمان فسفات پتاسیم منیزیم با نسبت منیزیم به فسفات بالا
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی صنعتی و تولید
چکیده انگلیسی
Understanding reaction mechanisms of magnesium potassium phosphate (MKP) cement is of significant importance, as it is closely related to the optimum design of MKP cement-based materials. In this study, reaction mechanisms of MKP cements with a high magnesium-to-phosphate (Mg/PO4) molar ratio of 8 were investigated at two different water-to-solid (w/s) ratios of 0.5 and 5. The experimental findings show that the use of this high Mg/PO4 molar ratio suppresses the formation of potassium-free magnesium phosphate hydrates. K-struvite is mainly formed with probably more phosphate than the theoretical value. Moreover, the w/s ratio plays a crucial role on governing the reaction path of MKP cements. The lower w/s ratio (w/sâ¯=â¯0.5) leads to higher potassium concentration and pH value, thus suppressing the formation of intermediate product, Mg2KH(PO4)2·15H2O, which is formed at the higher w/sâ¯=â¯5. However, it causes the formation of minor amount of brucite at 28 d, which coexists with K-struvite in the paste.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Cement and Concrete Research - Volume 108, June 2018, Pages 140-151
Journal: Cement and Concrete Research - Volume 108, June 2018, Pages 140-151
نویسندگان
Biwan Xu, Barbara Lothenbach, Andreas Leemann, Frank Winnefeld,