RATTANASAK U, KENDALL K. Pore structure of cement/pozzolan composites by X-ray microtomography [J]. Cem Concr Res, 2005, 35: 637-640. [2] GALLUCCI E, SCRIVENER K, GROSO A, et al. 3D experimental investigation of the microstructure of cement pastes using synchrotron X-ray microtomography (uCT)[J]. Cem Concr Res, 2007, 37: 360-368. [3] ROUGELOT T, BURLION N, BERNARD D, et al. About microcracking due to leaching in cementitious composites: X-ray microtomography description and numerical approach [J]. Cem Concr Res, 2010, 40: 271-283. [4] LANDIS E N, NAGY E N and KEANE D T. Microstructure and fracture in three dimensions [J]. J Eng Mech, 2003, 70(7): 911-925. [5] STOCK S R, NAIK N K, WILKINSON A P. X-ray microtomography (micro CT) of the progression of sulfate attack of cement paste [J]. Cem Concr Res, 2002, 32: 1673-1675. [6] BENTZ D P, MIZELL S, SATTERFIELD S, et al. The visible cement data set [J]. J Res National Ins Standards Technol, 2002, 107(2): 137-148. [7] GOMMES C J, BONS A J, BLACHER S, et al. Practical methods for measuring the tortuosity of porous materials from binary or gray-tone tomographic reconstructions [J]. AICHE J, 2009, 55(8): 2000-2012. [8] FLANNERY B P, DECKMAN H W, ROBERGE W G, et al. Three- dimensional X-ray microtomography [J]. Science, 1987, 237: 1439- 1443. [9] LU S, LANDIS E N, KEANE D T. X-ray microtomographic studies of pore structure and permeability in portland cement concrete [J]. Mater Struct, 2006, 39: 611-620. [10] GUO L P, CARPINTERI A, SUN W, et al. Measurement and analysis of defects in high-performance concrete with three-dimensional micro-computer tomography [J]. J Southeast Univ (En Ed), 2009, 25(1): 83-88. [11] MORI S, ENDO M, KOMATSU S, et al. A combination-weighted Feldkamp-based reconstruction algorithm for cone-beam CT [J]. Phys Med Biology, 2006, 51(16): 3953-3965. [12] PAPADAKIS V G, VAYENAS C G, FARDIS M N. Fundamental modeling and experimental investigation of concrete carbonation [J]. ACI Mater J, 1991, 35: 363-373. [13] PAPADAKIS V G, VAYENAS C G. Experimental investigation and mathematical modeling of the concrete carbonation problems [J]. Chem Eng Sci, 1991, 46: 1333-1338. [14] THIERY M, VILLAIN G, DANGLA P, et al. Investigation of the carbonation front shape on cementitious materials: effects of the chemical kinetics [J]. Cem Concr Res, 2007, 37: 1047-1058. [15] HAN J D, PAN G H, SUN W, et al. X-ray computed tomography studies of 3D meso-defect volume distribution changes of cement paste due to carbonation [J]. Adv Mater Res, 2011, 163-167: 3061-3066.