Jiao B.-X.,Yancheng Institute of Technology |
Zhou Q.-Z.,Yancheng Institute of Technology |
Yan X.-B.,Yancheng Institute of Technology |
Ding S.,Yancheng Traffic Bureau |
And 3 more authors.
Jianzhu Cailiao Xuebao/Journal of Building Materials | Year: 2012
A new type of magnesia-phosphate cement(MPC)that has high strength and controllable setting time was prepared by low acidity phosphates (NH 4) 2HPO 4 and K 2 HPO 4 as raw materials. The results show that the new MPC has better fluidity and longer setting time with the decrease in (NH 4) 2HPO 4/ K 2 HPO 4 molar ratio in the case of fixed m w/m c ratio and retarder dosage. Early compressive strength of the new MPC after adding K 2 HPO 4 decreases slightly, while 28 d compressive strength of the new MPC is all above 70 MPa. The main hydration products of MPC are N H4MgPO 4· 6H 2O and KMgPO 4 · 6H 2O.
Yang J.-M.,Nanjing Southeast University |
Yang J.-M.,Yancheng Institute of Technology |
Qian C.-X.,Nanjing Southeast University |
Zhou Q.-Z.,Yancheng Traffic Bureau |
And 2 more authors.
Jianzhu Cailiao Xuebao/Journal of Building Materials | Year: 2011
The effect of waterglass on the anti-washout ability of potassium and magnesium phosphate cement(MKPC) paste in water was observed. The preformance and microstructure of hardened MKPC were investigated. The results indicated that, because a certain dosage of waterglass has thickening effect on MKPC paste, it may prevent infiltration of water and dissolution of phosphate when fresh MKPC paste was placed in water, at the same time, it will decrease the change of composition in early hydration of MKPC paste. Some waterglass may make the crystal size of hydration products of hardened MKPC smaller and obtain the hardened MKPC with compact structure. It also leads to the obvious decrease of strength loss of hardened MKPC under the erosion of water environment.