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分别采用短切碳纤维和短切玻璃纤维对磷酸盐水泥进行了增强改性研究。采用羧甲基纤维素溶液做分散剂使短切纤维在水泥基体中得到了很好的分散;通过凝结时间及抗折强度测试,研究了纤维种类与掺量对磷酸盐水泥性能的影响。结果表明,短切纤维的加入对磷酸盐水泥的凝结时间影响不明显;两种短切纤维的加入都使磷酸盐水泥的抗折强度显著提高,磷酸盐水泥的抗折强度随着纤维掺量的增加(0%～1.5%)而增加,其中当纤维加入量为1.5%时,碳纤维改性磷酸盐水泥的抗折强度达到13.1MPa,玻璃纤维改性磷酸盐水泥的抗折强度达到12.8MPa,分别比素磷酸盐水泥提高了34.0%和30.0%。两种短切纤维增强改性的磷酸盐水泥的性能都达到了实际道路修补材料的要求。
Reinforced phosphate cement was modified by chopped carbon fiber and chopped glass fiber respectively. Using carboxymethyl cellulose solution as dispersant, the chopped fibers were well dispersed in the cement matrix. The influence of fiber types and dosages on the properties of phosphate cement was studied by setting time and flexural strength. The results showed that the addition of chopped fiber had no significant effect on the setting time of phosphate cement. The addition of both chopped fibers increased the flexural strength of phosphate cement significantly. The flexural strength of phosphate cement increased with the increase of fiber content (0% ~ 1.5%). When the amount of fiber added is 1.5%, the flexural strength of carbon fiber modified phosphate cement reaches 13.1MPa, the flexural strength of glass fiber modified phosphate cement reaches 12.8MPa , Respectively, increased by 34.0% and 30.0% than the phosphate cement. The performance of both short cut fiber reinforced phosphate cement meets the requirements of actual road repair materials.