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采用纳米压痕技术研究了不同龄期水泥硬化浆体中水化硅酸钙(C-S-H)凝胶的微观弹塑性和徐变特性。结果表明,随着龄期的增长,C-S-H凝胶在相同荷载作用下的弹性能逐渐减小,并趋于稳定值,且低密度C-S-H凝胶的弹性能均高于同龄期的高密度C-S-H凝胶。对于相同的荷载和持荷时间,高密度C-S-H凝胶的徐变显著低于同龄期低密度C-S-H凝胶。应用纳米压痕技术从微观层面测定了两种密度C-S-H凝胶的变形性能的差异,揭示了C-S-H凝胶的弹性能和徐变与凝胶的折合弹性模量呈反比关系。
The micro-elasto-plasticity and creep properties of hydrated calcium silicate (C-S-H) gels in different age cement hardened slurries were studied by nano-indentation technique. The results show that with the increase of age, the elastic properties of CSH gel decrease with the same loading and tend to be stable, and the elastic properties of CSH gel are higher than those of the same age glue. For the same loading and holding time, the creep of high-density C-S-H gel was significantly lower than that of low-density C-S-H gel of the same age. The difference of deformability of C-S-H gel with two kinds of densities was measured at the microscopic level by nano-indentation. The elastic energy and creep of C-S-H gel were inversely proportional to the equivalent elastic modulus of gel.