磷酸镁水泥抗压强度及影响因素研究

关键字：磷酸镁水泥；抗压强度；硼砂；粉煤灰

[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  210024；

3.江苏省（瑞迪）水工新材料工程技术研究中心，江苏 南京  210024；

4.南京市长江河道管理处，江苏 南京  210011；5.正德职业技术学院，江苏 南京  211106]

    摘要：研究了镁磷质量比、硼砂掺量、镁砂细度、水胶比及粉煤灰掺量等因素对磷酸镁水泥抗压强度的影响规律。结果表明，镁磷质量比对抗压强度的影响比较大，存在一个最佳的比值；硼砂掺量对早期抗压强度的影响非常明显，4 h和1 d抗压强度最大降低幅度分别达79.7%和73.1%；重烧镁砂比表面积的增大有利于各龄期抗压强度的提高，水胶比的增大则不利于抗压强度的发展；少量的粉煤灰掺入对抗压强度影响较小，粉煤灰掺量过大则极大地降低了各龄期的抗压强度。

    关键词：磷酸镁水泥；抗压强度；硼砂；粉煤灰

    中图分类号：TU526；TQ177.5        文献标识码：A        文章编号：1001-702X（2018）03-0012-04

 

Study on compressive strength and influencing factors of magnesium phosphate cement

WEN Jinbao1，2，3，ZHANG Youcai4，ZHANG Lixia5，TANG Xiusheng1，2，3，

ZHU Yeran1，2，3，HUANG Guohong1，2，3，CAI Ming1，2，3

（1.Nanjing Hydraulic Research Institute，Nanjing 210024，China；2.Nanjing R&D High Technology Co. Ltd.，Nanjing 210024，China；

3.Research Center on New Materials in Hydraulic Structures of Jiangsu R&D，Nanjing 210024，China；

4.Nanjing Yangtze River Channel Administration，Nanjing 210011，China；5.Zhengde Polytechnic，Nanjing 211106，China）

   Abstract：The effects of magnesium to phosphorus ratio，borax content，fineness of magnesia，water binder ratio and fly ash content on the compressive strength of magnesium phosphate cement were investigated. The results show that the ratio of magnesium to phosphorus has a very great influence on compressive strength，and there is an optimum ratio value. The influence of borax content on the early compressive strength is obvious，and the compressive strength of 4 h and 1 d can be reduced by 79.7% and 73.1% respectively at most. The increase of specific surface area of burned magnesia is beneficial to the increase of compressive strength at different age. On the contrary，the increase of water binder ratio is unfavorable to the development of compressive strength. A small amount of fly ash has little influence on the compressive strength，while the large amount of fly ash has a greater influence on the compressive strength，which greatly reduces the compressive strength at all ages.

    Key words：magnesium phosphate cement，compressive strength，borax，fly ash