新型超硫酸盐水泥水化硬化机理

Hydration and Hardening Mechanisms of Newly Developed Supersulfated Cement

研究了硫铝酸盐激发的超硫酸盐水泥(CSA-SSC)的水化硬化机理。采用微量热仪、TGA和SEM-SE方法对CSA-SSC的水化放热过程、水化产物和微观结构进行了分析。研究表明:CSA-SSC早期的强度略低,后期CSA-SSC的强度快速增长;该材料表现出超低水化热特性;CSA-SSC水化早期产物主要是钙矾石,在水化后期,主要产物是C-S-H凝胶;CSA-SSC硬化体中的针状钙矾石相互交错形成骨架,C-S-H凝胶则填充于骨架之间,使整个水泥浆体形成致密的结构,从而CSA-SSC的强度逐渐提高。

The hydration and hardening mechanisms of calcium sulfoaluminate activated supersulfated cement(CSA-SSC)were investigated.The methods of Isothermal Calorimetry,TGA and SEM-SE were used to determine the hydrating process,the compositions of hydration products and microstructure features.The results show that the early strength of CSA-SSC is slightly lower,and the late strength of CSA-SSC increases rapidly.CSA-SSC exhibits the characteristic of ultra-low hydration heat.During early hydration period,the main hydration product of CSA-SSC is ettringite.During late hydration period,the main hydration product of CSA-SSC is C-S-H gel.The acicular ettringite in CSA-SSC pastes is interlaced to form a framework.The C-S-H gel is filled with the pore of framework to form a dense structure to increase its strength.