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使用动态力学分析的模量成像技术对硬化水泥净浆进行微观层次上的物相识别,根据不同物相弹性性质的差异得到了目标区域的储能模量图,辅以形貌观测、成分分析和原位静态压痕手段,准确识别了未水化颗粒及其周边的高密度(High density,HD)和低密度(Low density,LD)CSH凝胶。结果表明,HD CSH凝胶和LD CSH凝胶的化学成分一致,其各自的典型动态模量分别为36GPa和24GPa,具有较好的区分度,且该值与同样表征物相弹性性质的压痕模量数值近似,动态模量成像图可给出清晰的物相边界。用该方法分析硬化水泥浆体微观性能,可避免由于不能准确定位各物相而引起盲目性和重复工作,有助于有的放矢地研究目标物相。
The phase structure of the hardened cement paste was identified at the microscopic level by using the modulus imaging technology of dynamic mechanical analysis. The storage modulus diagram of the target area was obtained according to the difference of the elastic properties of different phases, and the morphology observation and composition analysis And in-situ static indentation method to accurately identify the high density (HD) and low density (LD) CSH gels of unhydrated particles and their surroundings. The results show that the chemical compositions of HD CSH gel and LD CSH gel are the same, and their typical dynamic moduli are 36GPa and 24GPa, respectively, with good discrimination, which is consistent with the indentation Modulus numerical approximation, dynamic modulus imaging can give a clear phase boundary. Using this method to analyze the microscopic properties of hardened cement paste can avoid the blindness and repetitive work caused by the inaccurate positioning of each phase and help to study the target phase.