Simulation of autogenous and drying shrinkage based on micro-pore structure and internal moisture states

Author(s): Y. Luan, T. Ishida
Paper category: Conference
Book title: 2nd International conference on Microstructural-related Durability of Cementitious Composites
Editor(s): Guang Ye, K. Van Breugel, Wei Sun, Changwen Miao
Print ISBN: 978-2-35158-129-2
e-ISBN: 978-2-35158-123-0
Publisher: RILEM Publications SARL
Pages: 1072 - 1080
Total Pages: 8
Language: English

A multi-scale constitutive model which simulates shrinkage of concrete is improved based on early age hydration and moisture state in micro pores. First it is found that the original model underestimates autogenous shrinkage at initial days. Therefore the contribution of chemical shrinkage to autogenous shrinkage at early age is discussed and its influence is added. Besides, long time shrinkage is also modified, considering driving force acting on pores with different radii respectively. Driving force is assumed dominated by disjoining pressure in nanoscale pores and capillary tension acting in larger pores. With the improved model, autogenous shrinkage and drying shrinkage with various w/c ratios and relative humidity can be simulated reasonably.

Online publication: 2013
Publication Type: full_text
Public price (Euros): 0.00