SIMULATION ON WATER ABSORPTION BEHAVIOR OF CRACKED ECC MATERIAL BASED ON A TWO-PHASE ABSORPTION MODEL

Author(s): Y. Luan, T. Ishida
Paper category: Proceedings
Book title: Proceedings of CONSEC13 Seventh International Conference on Concrete under Severe Conditions - Environment and Loading Volume I
Editor(s): Z.J. Li, W. Sun, C.W. Miao, K.Sakai, O.E. Gjørv, N.Banthia
ISBN: 978-2-35158-124-7
e-ISBN: 978-2-35158-134-6
Publisher: RILEM Publications SARL
Publication year: 2013
Pages: 243-255
Total Pages: 961
Language : English

Abstract: Cracks in cementitious materials are vulnerable and easily accessible to water and harmful agents, resulting in accelerated deterioration of structures. Therefore, it is unavoidable to consider the influence of cracks on durability. In this study, with the purpose of simulating water absorption behavior of Engineered Cementitious Composites (ECC) with the existence of multi-cracks, a two-phase model is proposed. Cement matrix and multi-cracks are treated as two phases, and the flows in them are separated and simulated, respectively. Multi-cracks are assumed to be smeared in space, and the flow is quantitatively described by capillary suction theory. On the contrary, water flow in cement matrix is simulated by an existing multi-scale model. Besides, water ingression from multi-cracks to cement matrix is treated as the exchange between the two phases. Multi-cracks are regarded as reservoirs to supply water to cement matrix continuously by means of capillary suction. This water exchange is quantified according to water status in multi-cracks and cement matrix. The two-phase model is verified using absorption test of cracked ECC specimens, and the accelerated absorption process can be reasonably simulated.

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