Abstract

Info

Title:: 3D distribution characteristics on concrete porous structure under freeze-thaw environment based on CT tehcnique

Author(s):: TIAN Wei; ZHANG Peng-kun; XIE Yong-li; DANG Fa-ning; (1. School of Civil Engineering, Chang’an University, Xi’an 710061, Shaanxi, China; 2. School of Highway, Chang’an University, Xi’an 710064, Shaanxi, China; 3. Institute of Geotechnical Engineering, Xi’an University of Technology, Xi’an 710048, Shaanxi, China)

Keywords:: geotechnical engineering; concrete; freeze-thaw cycle; CT technique; porous structure; meso-damage

Abstract:: To research the change law of internal meso-porous characteristics of concrete under different freeze-thaw cycles, the CT technology was used to in situ scan the evolution of concrete damage process under freeze-thaw cycles, so the batch of 2D slice images was obtained. On this basis, the 3D porous structure of concrete was reconstructed by means of full digital image processing analysis tools, so the statistics porosity and porous structure distribution of 3D porous structure characteristics parameters were obtained. The results show that the porosity of concrete materials present a “down-up” trend with the growth of cycle numbers. Meanwhile, the frequency distribution curve of volume porous significantly changes with the change of freeze-thaw cycle numbers. The results demonstrate that the characteristics of concrete porous development and propagation are indicated under the condition of freeze-thaw cycles. Three dimensional dynamic measurement and distribution characteristics of interior porous structure is vital for the depiction on interior structure characteristics and damage mechanism of freeze-thaw damage concrete.