Ion-transport characteristics of new-old concrete composite system
来源期刊：中南大学学报(英文版)2014年第2期
论文作者：LONG Guang-cheng(龙广成) 谢友均 DING Wei-wei(丁巍巍) Ahmed OMRAN
文章页码：790 - 798
Key words：new-old concrete composite; chloride diffusivity; permeability; transport property
Abstract: New-old concrete composite system usually exists in concrete repairing structure. In the present work, series of experiments were carried out to investigate permeability and ion diffusion properties of new-old concrete composite by measuring 6-hour coulomb charge and chloride diffusivity. The interrelation among transport properties of new-old composites, new, and old concretes was also discussed. Results indicate that the permeability and chloride diffusivity of new-old concrete composite system closely interrelate to the corresponding new concrete and old concrete. The interfacial transition zone between new concrete and old concrete greatly influences the transport property of new-old concrete system. Compared with the corresponding new concrete and old concrete lower permeability and diffusivity values for the new-old concrete composites can be achieved by choosing suitable new concrete. It is possible to design the tailor-made new-old concrete composite system for repair given the transport property.
LONG Guang-cheng(龙广成)1, XIE You-jun(谢友均)1, DING Wei-wei(丁巍巍)1, Ahmed OMRAN2
(1. School of Civil Engineering, Central South University, Changsha 410075, China;
2. Université de Sherbrooke, Sherbrooke J1K2R1, Canada)
Abstract:New-old concrete composite system usually exists in concrete repairing structure. In the present work, series of experiments were carried out to investigate permeability and ion diffusion properties of new-old concrete composite by measuring 6-hour coulomb charge and chloride diffusivity. The interrelation among transport properties of new-old composites, new, and old concretes was also discussed. Results indicate that the permeability and chloride diffusivity of new-old concrete composite system closely interrelate to the corresponding new concrete and old concrete. The interfacial transition zone between new concrete and old concrete greatly influences the transport property of new-old concrete system. Compared with the corresponding new concrete and old concrete lower permeability and diffusivity values for the new-old concrete composites can be achieved by choosing suitable new concrete. It is possible to design the tailor-made new-old concrete composite system for repair given the transport property.
Key words:new-old concrete composite; chloride diffusivity; permeability; transport property
