水化硅酸钙凝胶的弹塑性和徐变特性

材料研究学报

2010, Vol. 24

Issue (2): 123-128

研究论文

本期目录 | 过刊浏览

水化硅酸钙凝胶的弹塑性和徐变特性

姚武; 梁慷; 何莉

同济大学先进土木工程材料教育部重点实验室上海 200092

Determination of Elastic–plasticity and Creep of Calcium–Silicate–Hydrate Gel

YAO Wu; LIANG Kang; HE Li

Key Laboratory of Advanced Civil Engineering Materials (Tongji University); Ministry of Education; Shanghai 200092

引用本文:

姚武梁慷何莉. 水化硅酸钙凝胶的弹塑性和徐变特性[J]. 材料研究学报, 2010, 24(2): 123-128.
, , . Determination of Elastic–plasticity and Creep of Calcium–Silicate–Hydrate Gel[J]. Chin J Mater Res, 2010, 24(2): 123-128.

全文: PDF(565 KB)

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。

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

Abstract：

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.

Key words： inorganic non-metallic material elasto-plastic performance nanoindentation calcium silicate hydrate gel creep

收稿日期: 2009-12-22

基金资助:

国家重点基础研究发展计划2009CB623105资助项目。

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https://www.cjmr.org/CN/ 或 https://www.cjmr.org/CN/Y2010/V24/I2/123

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