Abstract
This work investigated the effect of sodium alginate on the hydration properties of magnesium potassium phosphate cement (MKPC) suspension with a high w/c ratio, and explored its retarding mechanism. At w/c = 10, hydration of MKPC presented a mult-step process, specifically, KMg2H(PO4)2•15H2O and possibly MgHPO4·7H2O first precipitate, then decomposed to struvite-k. As sodium alginate was added, Na2HPO4•12H2O and KMg2H(PO4)2•15H2O precipitated at the initial stage, and then destabilized afterwards. Sodium alginate could delay dissolution of KMg2H(PO4)2•15H2O as well as precipitation of struvite-k. Moreover, sodium alginate tends to transform to alginic acid at low pH, and left a large number of Na+ ions, leading to precipitation of Na2HPO4•12H2O. The alginic acid is difficult to dissolve at low pH, which limited its effect on extending the setting time of MKPC further.
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