Increasing the amount of final hydration products of magnesium potassium phosphate cements (MKPC) can improve its mechanical properties and increase its application diversity. This work investigates the influence of the MgKPO₄·6H₂O (K-struvite) on the hydration behavior and mechanisms of MKPC with Mg/P ratio of 6 at w/c ratio of 0.3. The results indicate the number of exothermic peaks decreases with addition of K-struvite, besides, the hydration heat of MKPC increases first and then decreases compared with MKPC without K-struvite. At w/c ratio of 0.3, traces of K-struvite and Mg(OH)₂ are present in the final hydrated products. The compressive strength of MKPC at 3 d and 28d is 22.5% and 26.1% higher than that of control sample, the porosity of MKPC pastes decreases by 23.5% and 25.3% compared with control sample with 10 wt% of K-struvite at the age of 3d and 28d. K-struvite provides the nucleation site, which increase the quantity of hydration products as nucleating seeding. This work gives an innovative idea to partially replace MKPC by K-struvite, which provide theoretical reference for the practical application of MKPC.

增加磷酸镁钾水泥（MKPC）的最终水合产物的数量可以改善其机械性能并增加其应用多样性。这项工作研究了MgKPO ₄ ·6H ₂ O（钾鸟粪石）对水合比为0.3的Mg / P比为6的MKPC的水合行为及其机理的影响。结果表明，加入K-鸟粪石的放热峰数减少，此外，与没有K-鸟粪石的MKPC相比，MKPC的水合热先增加后降低。w / c比为0.3时，有痕量的钾鸟粪石和Mg（OH）₂存在于最终的水合产物中。MKPC在3 d和28 d时的抗压强度比对照样品高22.5％和26.1％，与10重量％K-鸟粪石的对照样品相比，MKPC糊剂的孔隙率分别降低了23.5％和25.3％。 3d和28d。K-鸟粪石提供了成核位点，这增加了水化产物作为成核种子的数量。这项工作提出了一种创新的思想，即用钾鸟粪石部分替代MKPC，这为MKPC的实际应用提供了理论参考。