Resistivity Study on Early Hydration Process of Phosphoaluminate Cementitious Material
Resistivity Study on Early Hydration Process of Phosphoaluminate Cementitious Material
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磷铝酸盐胶凝材料早期水化过程的电阻率研究
DOI：
10.4028/www.scientific.net/amr.79-82.95
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发表时间：
2009-08
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新近研制的无电极电阻率测量系统为连续、准确地监测水泥基材料的水化过程提供了可靠的手段。磷铝酸盐水泥（PAC）凝结快，早期强度高。为了更好地理解其作用机理，需要对PAC早期水化产物和微观结构的形成进行研究。采用无极电阻率法研究了不同缓凝剂掺量的聚合氯化铝的早期水化过程。从电阻率-时间曲线可以看出，新拌PAC浆体电阻率先急剧下降后缓慢上升，在不同水化阶段出现了一些特征峰。还测量了PAC的放热。根据这些结果，对水泥的水化机理和结构形成进行了研究。根据缓凝剂掺量的不同，PAC的水化过程分为溶解、诱导、加速和减速四个阶段。
An electrodeless resistivity measurement system developed recently can provide a reliable method for monitoring the hydration process of cement-based materials continuously and accurately. Phosphoaluminate cement (PAC) sets quickly and develops high early strength. In order to understand the mechanism, the hydration products and microstructure formation of PAC in early age need to be studied. In the study, early hydration process of PAC with different dosage of retarder was investigated by the electrodeless resistivity equipment. According to resistivity-time curve, resistivity of freshly mixed PAC paste decreases sharply and then rises slowly, some characteristic peaks appear at different hydration stages of PAC. Heat evolution of PAC was also measured. The hydration mechanism and structure formation were studied according to these results. Depending on the dosage of retarder, the hydration process of PAC includes four stages which are dissolution, induction, acceleration and deceleration.