Effect of temperature curing on properties and hydration of wollastonite blended magnesium potassium phosphate cements

K-struvite, the main hydrate of magnesium potassium phosphate (MKP) cements, dehydrates at ~50 °C, thus elevated temperatures service conditions could affect cement properties and durability. In this study, hydration MKP without with wollastonite were investigated 20 50 °C. hydrated pure K-struvite decomposes progressively over time to MgKPO4·H2O which leads a strong reduction solid volume severe strength loss. The presence significantly slows down decomposition rate is still observed after 393 days together amorphous hydroxyapatite, M-(C)-S-H CaK3H(PO4)2 from reaction result in good short long-term both