砂浆密实剂对PCCP保护层砂浆耐久性的影响研究

关键字：砂浆,密实剂,PCCP,保护层,耐久性,影响

[（1.南京水利科学研究院，江苏 南京  210024；2.南京瑞迪高新技术有限公司，江苏 南京  211161；
3. 江苏省（瑞迪）水工新材料工程技术研究中心，江苏 南京  210024）] 

 
    摘要：测试了砂浆密实剂（DSF）不同掺量对预应力钢筒混凝土管（PCCP）保护层砂浆流动度、力学性能和耐久性（砂浆致密性、抗裂性及粘结性）的作用效果。结果表明：DSF对保护层砂浆的流动度和力学性能无不利影响；掺加15%DSＦ后，保护层砂浆28 d吸水率降低66.7%，氯离子扩散系数和渗水高度均降至0，28 d干缩率降低22.4%，圆环开裂试件无裂缝产生，粘结强度提高15.4%，明显提高了保护层砂浆的抗渗、抗裂、抗侵蚀及粘结强度等耐久性能。
    关键词：砂浆密实剂；PCCP；保护层砂浆；耐久性
    中图分类号：TU528.042        文献标识码：A        文章编号：1001-702X（2017）10-0135-04
 

Research on influence of mortar dense agent for durability of PCCP protective layer mortar
WANG Dong1，2，3，ZHU Yeran1，2，3，CHEN Guoxing1，2，3，SHI Mingjian2，3
[1.Nanjing Hydraulic Research Institute，Nanjing 210024，China；2.Nanjing R&D High-tech Co.　Ltd.，Nanjing 211161，China；3.Jingsu（R&D）Hydraulic Project New Material Engineering Technology Research Center，Nanjing 210024，China]

    Abstract：This paper tested the effect of mortar density agent（DSF）　of different dosage on work degree，mechanical strength and durability（mortar density，crack resistance and bonding）　of PCCP protective layer mortar.Test results show that：DSF is without adverse effects to work degrees and mechanical strength of protective layer mortar，with 15% DSF，28 d bibulous rate of mortar is reduced by 66.7%，chloride ion diffusion coefficient and the height of the water seepage is 0，28 d drying shrinkage rate reduced by 22.4%，crack specimens without cracks，bond strength increased by 15.4%. The permeability of mortar，crack resistance，erosion resistance，bond strength and other endurance performance are significantly improved.
    Key words：mortar density agent，PCCP，protective layer mortar，endurance performance