中文摘要：

研究了磷酸二氢钾（KDP）、磷酸二氢铵（ADP）及其复合盐对磷酸镁水泥（MPC）净浆流动性、凝结时间、早期温升、强度发展和体积稳定性等的影响。并采用3种不同的粘结方式，着重研究了单一磷酸盐及其复合盐对MPC粘结强度、界面裂缝发展及孔洞形貌等的影响。结果表明：与KDP—MPC相比，ADP-MPC放热高，早期强度高，但前者内部及界面具有更少的孔洞，利于界面粘结；KDP—MPC早期收缩发展快，当处于约束状态下时，MPC粘结能力弱，更易开裂。将KDP＋ADP复合盐掺入MPC体系后，其浆体与ADP．MPC具有相似的流动性和凝结特性，孔洞数量减少且孔径变得细小均匀，强度有所提高，尤其界面区密实度的改善使得KDP＋ADP-MPC各龄期抗折和斜剪粘结强度比掺单一磷酸盐的平均提高40％以上：在收缩较大的KDP-MPC中掺入部分ADP后，使得KDP＋ADP-MPC在约束条件下也有较好的粘结能力。

英文摘要：

Influences of phosphate （i.e., potassium dihydrogen phosphate （KDP）, ammonium dihydrogen phosphate （ADP） and their compounds） on the fluidity, setting time, early temperature rise, strength development and volume stability of magnesium phosphate cement （MPC） were investigated. Besides, the effect of phosphate on the bond strength, interface crack development and interfacial morphology of voids in MPC was investigated emphatically by three different adhesive types. The results show that the ADP-MPC exhibits more exothermic evolution and substantially higher early strength than that of KDP-MPC, and the latter demonstrates a lower porosity in the paste as well as interface, which favors the improvement of the interface adhesion between MPC and substrate. The KDP-MPC under restricted state shows a weak bond and is liable to crack due to its faster early shrinkage development. The MPC prepared with either a combination of KDP and ADP or the ADP has the similar fluidity and setting behavior. However, the porosity amount and voids size of the MPC paste containing KDP and ADP are smaller, resulting in a higher compression strength. Moreover, the flexural bond strength and slant shear bond strength of MPC prepared with KDP and ADP are increased by an average of 〉40%, compared to those of MPC containing either KDP or ADP only at each age due to the higher compactness in the interface of the former. When the ADP is added to the KDP-MPC, the MPC prepared with ADP and KDP under restricted state can also exert a good bond behavior.