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

Chin J Mater Res

2010, Vol. 24

Issue (2): 123-128 DOI:

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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

Cite this article:

YAO Wu LIANG Kang HE Li. Determination of Elastic–plasticity and Creep of Calcium–Silicate–Hydrate Gel. Chin J Mater Res, 2010, 24(2): 123-128.

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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

Received: 22 December 2009

Fund:

Supported by the National Basic Research Program of China No.2009CB623105.

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https://www.cjmr.org/EN/ OR https://www.cjmr.org/EN/Y2010/V24/I2/123

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