摘要
磷酸镁水泥由过烧氧化镁和可溶性磷酸盐组成,是一种新型的水硬性胶凝材料。它早期强度高、收缩小、抗硫酸盐侵蚀能力强,能够与硅酸盐水泥基材料形成较强的粘结力,但其耐水性较差,原材料成本较高。因此,各类矿物掺合料如矿渣、粉煤灰、偏高岭土等被尝试用来取代部分原材料。在适当的掺量与取代方式下,矿物掺合料能够延缓凝结时间,提高抗压强度,并且能够改善耐水性。此外,氧化镁与磷酸盐的物质的量比、水胶比等也决定着磷酸镁水泥的性能。本文对磷酸镁水泥的水化机理、抗压强度、粘结强度、耐久性、体积稳定性进行了总结,指出了现有研究中的不足,并给出了建议与展望。
Magnesium phosphate cement(MPC),composed of dead burned MgO and soluble phosphate,is a new cement material.The advantages of MPC are high early strength,low shrinkage,strong sulfate resistance and strong bonding with Portland cement-based materials.Howe-ver,the water resistance of MPC is weak and the cost of raw materials is high.Therefore,mineral admixtures such as GGBS,fly ash and metakaolin are used to replace a part of raw materials.At suitable replacement ratio,mineral admixtures could retard setting time,elevate compressive strength and enhance water resistance of MPC.Besides,the MgO to phosphate mole ratio and water to binder ratio have an important influence on the property of MPC.In this paper,the hydration mechanism,compressive strength,bonding strength,durability and volume stability of MPC are summarized.Finally,the limitations of current researches and suggestions as well as perspectives for the future are provided.
作者
刘进
呙润华
张增起
LIU Jin;GUO Runhua;ZHANG Zengqi(Department of Civil Engineering,Tsinghua University,Beijing 100084,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2021年第23期23068-23075,共8页
Materials Reports
基金
国家自然科学基金项目(51568063)
中国博士后科学基金项目(2019M660037,2020T130355)。
关键词
矿物掺合料
水化机理
粘结强度
耐久性
mineral admixture
hydration mechanism
bond strength
durability
