基体约束条件下路用复合材料粘接性能研究

Study on bonding properties of highway cement-based composites under matrix constraints

考察基体约束条件下磷酸镁水泥基材料的粘接性能,对比了不同硼砂掺量、水胶比和龄期的磷酸镁水泥基材料的抗剪粘接强度和界面形貌。结果表明,相同龄期下磷酸二氢铵配制的磷酸镁水泥基材料的拉剪粘接强度相对较大;随着龄期的增加,不同掺量的磷酸镁水泥基材料的抗剪粘接强度都呈现逐渐上升的趋势,且硼砂掺量为15%时磷酸镁水泥基材料具有相对最高的抗剪粘接强度。当龄期达到1 d及以上、M/P=2时,磷酸镁水泥基材料的拉剪粘接强度明显高于其他试样的特征;不同水胶比的磷酸镁水泥基材料(砂浆)的拉剪粘结强度都明显高于龄期2 h的试样,且水胶比为0.12时磷酸镁水泥基材料(砂浆)的拉剪粘接强度相对最大。

The bond properties of magnesium phosphate cement-based materials under matrix constraints were investigated,and the shear bond strength and interface morphology of magnesium phosphate cement-based materials with different borax content,water binder ratio and age were compared.The results show that the tensile and shear bond strength of magnesium phosphate cement-based materials prepared by ammonium dihydrogen phosphate is relatively large at the same age;with the increase of age,the shear bond strength of magnesium phosphate cement-based materials with different content presents a gradual increase trend,and the magnesium phosphate cement-based material with 15%borax has the highest shear bond strength.When the age reaches 1d and above and when M/P=2,the tensile shear bond strength of magnesium phosphate cement-based materials(mortar)is significantly higher than that of other samples;the tensile and shear bond strength of magnesium phosphate cement-based materials(mortar)with different water binder ratio is significantly higher than that of samples with age of 2 h,and the tensile shear bond strength of magnesium phosphate cement-based materials(mortar)is the largest when the water binder ratio is 0.12.