Abstract This study investigates the effect of wollastonite on the hydration and properties of magnesium potassium phosphate (MKP) cements. In MKP cements some efflorescence can occur; the presence of wollastonite suppresses efflorescence as the formation of Mg2KH(PO4)2·15H2O is prevented. The presence of wollastonite leads also to more heat (per g of MKP cement) due to the filler effect and due to the reaction of wollastonite, which increases strength, especially at low water-to-binder (w/b) ratio of 0.25 and at later ages, and lowers the pH values in the cement pore solution. The reaction of wollastonite does not lead to the formation of crystalline hydrates, both experimental and thermodynamic findings suggest the formation of amorphous hydroxyapatite and magnesium silicate hydrates (M-S-H).

中文翻译：

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硅灰石对磷酸钾镁水泥水化及性能的影响

摘要 本研究研究了硅灰石对磷酸镁钾（MKP）水泥水化和性能的影响。在 MKP 水泥中可能会发生一些风化；硅灰石的存在抑制风化，因为 Mg2KH(PO4)2·15H2O 的形成被阻止。由于填料的作用和硅灰石的反应，硅灰石的存在也会导致更多的热量（每克 MKP 水泥），这会增加强度，特别是在 0.25 和 0.25 的低水与粘合剂 (w/b) 比时在后期，并降低水泥孔隙溶液中的 pH 值。硅灰石的反应不会导致结晶水合物的形成，实验和热力学结果都表明形成了无定形羟基磷灰石和硅酸镁水合物 (MSH)。