摘要
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。
A nanoindentation was used to investigate nanoscale elasto-plastic and creep behaviors of Calcium Silicate Hydrate（C-S-H） gel of hardened cement pastes at different ages.The test results show that with the growth of age,the elastic energy stored in C-S-H gel decreases gradually and finally approaches to a stable value for the fixed load condition.Moreover,the elastic energy stored in low density （LD） C-S-H gel is greater than that stored in high density（HD） C-S-H gel at the same age.For the same load and same holding-time,the creep of HD C-S-H gel is significantly less than that of LD C-S-H gel at the same age.The deformation difference between two C-S-H gels with different densities was determined in micro-scale by using nanoindentation technique,indicating the elastic energy and creep of C-S-H gel are inversely related to its reduced elastic modulus.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2010年第2期123-128,共6页
Chinese Journal of Materials Research
基金
国家重点基础研究发展计划2009CB623105资助项目~~
关键词
无机非金属材料
弹塑性
纳米压痕
水化硅酸钙凝胶
徐变
inorganic non-metallic material
elasto-plastic performance
nanoindentation
calcium silicate hydrate gel
creep
