磷酸镁水泥基材料力学性能研究

Research on Mechanical Performance of Magnesium Phosphate Cement-Based Materials

研究了分别以磷酸二氢铵和磷酸二氢钾为主要原料的磷酸盐水泥试件的抗压强度。首先测试了水灰比为0.09~0.21的水泥浆试件的抗压强度,研究水灰比对抗压强度的影响。然后,研究了镁磷比、硼砂的掺量和磷酸盐的种类对水泥抗压强度的影响。研究结果显示,磷酸盐水泥的抗压强度随着水灰比的增加先增大后降低,当水灰比为0.12时水泥的抗压强度最大。磷酸盐水泥的抗压强度随着镁磷比的增加而先增大后降低,当镁磷比为9∶1时,磷酸盐水泥的抗压强度达到最高。当磷酸盐水泥的养护龄期小于7 d时,磷酸盐水泥试块的抗压强度随着硼砂掺量的增加而降低,当养护龄期达到7 d以上时,磷酸盐水泥试块的抗压强度随着硼砂掺量的增加而升高。掺磷酸二氢铵的水泥试件的抗压强度高于掺磷酸二氢钾的水泥试件的抗压强度。

The compressive strengths of phosphate cement specimens with ammonium dihydrogen phosphate and potassium dihydrogen phosphate as main raw materials were studied. Water cement ratios ranged from 0.09 to 0.21. Additionally, the influence of Mg/P ratio, borax content and phosphate types on the compressive strength of cement were determined. Results show that the compressive strength of phosphate cement increases first and then decreases with the increase of water cement ratio. When the water cement ratio is 0.12, the compressive strength of cement paste is the highest. The compressive strength of phosphate cement increases first and then decreases with the increase of Mg/P ratio. When the Mg/P ratio is 9∶1, the compressive strength of phosphate cement is the highest. When the curing age of phosphate cement is less than 7 d, the compressive strength of phosphate cement paste decreases with the increase of borax content. When the curing age is more than 7 d, the compressive strength of phosphate cement paste increases with the increase of borax content. The compressive strength of cement specimens with ammonium dihydrogen phosphate is higher than that of cement specimens with potassium dihydrogen phosphate.