Modeling the elastic modulus of cement paste with X-ray computed tomography and a hybrid analytical-numerical algorithm: The effect of structural heterogeneity

被引：17

作者：

Gao, Y. ^{[1
]}

Li, W. ^{[2
]}

Wu, K. ^{[3
]}

Yuan, Q. ^{[4
]}

机构：

[1] Southeast Univ, Sch Mat Sci & Engn, Jiangsu Key Lab Construct Mat, Nanjing 211189, Peoples R China

[2] China Three Gorges Corp, Div Sci & Technol Management, Beijing 110108, Peoples R China

[3] Tongji Univ, Sch Mat Sci & Engn, Key Lab Adv Civil Engn Mat, Shanghai 201804, Peoples R China

[4] Cent South Univ, Sch Civil Engn, Natl Engn Lab High Speed Railway Construct, Changsha 410075, Peoples R China

来源：

CEMENT & CONCRETE COMPOSITES | 2021年 / 122卷 / 122期

关键词：

Modeling elastic modulus; X-ray computed tomography; Self-consistent scheme; Finite element method; Multifractal theory; MULTIFRACTAL ANALYSIS; PORE STRUCTURE; HYDRATION; MICROSTRUCTURE; CONCRETE; COMPUTATION; COMPOSITES; PARAMETERS; EVOLUTION; SURFACES;

D O I：

10.1016/j.cemconcomp.2021.104145

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

The elastic modulus is a fundamental parameter that controls the mechanical behavior of cement paste. Because of structural heterogeneity, modeling the elastic modulus remains a challenging problem. In this study, X-ray computed tomography images are used to represent the structural features of cement paste; based on that, a hybrid analytical-numerical algorithm is proposed for modeling the elastic modulus. At the voxel level, a powerlaw formula relating the grayscale value to the elastic modulus is established using a combination of a hydration model and a self-consistent scheme. At the cement paste level, the finite element method is adopted to achieve homogenization. Special attention is paid to the effect of structural heterogeneity. To that end, the multifractal theory is employed.

引用

页数：10

共 56 条

[1] Analysis of C-S-H gel and cement paste by small-angle neutron scattering [J].

Allen, Andrew J. ;

Thomas, Jeffrey J. .

CEMENT AND CONCRETE RESEARCH, 2007, 37 (03) :319-324

[2] Computation of linear elastic properties from microtomographic images: Methodology and agreement between theory and experiment [J].

Arns, CH ;

Knackstedt, MA ;

Pinczewski, WV ;

Garboczi, EJ .

GEOPHYSICS, 2002, 67 (05) :1396-1405

[3] An original approach to assess elastic properties of a short glass fibre reinforced thermoplastic combining X-ray tomography and finite element computation [J].

Ayadi, Abderrahmane ;

Nouri, Hedi ;

Guessasma, Sofiane ;

Roger, Frederic .

COMPOSITE STRUCTURES, 2015, 125 :277-286

[4] A multiscale mictomechanics-hydration model for the early-age elastic properties of cement-based materials [J].

Bernard, O ;

Ulm, FJ ;

Lemarchand, E .

CEMENT AND CONCRETE RESEARCH, 2003, 33 (09) :1293-1309

[5] Fractal and multifractal analysis of pore-scale images of soil [J].

Bird, Nigel ;

Diaz, M. Cruz ;

Saa, Antonio ;

Tarquis, Ana M. .

JOURNAL OF HYDROLOGY, 2006, 322 (1-4) :211-219

[6] Sparse matrix solvers on the GPU:: Conjugate gradients and multigrid [J].

Bolz, J ;

Farmer, I ;

Grinspun, E ;

Schröder, P .

ACM TRANSACTIONS ON GRAPHICS, 2003, 22 (03) :917-924

[7] Micro- and nano-X-ray computed-tomography: A step forward in the characterization of the pore network of a leached cement paste [J].

Bossa, Nathan ;

Chaurand, Perrine ;

Vicente, Jerome ;

Borschneck, Daniel ;

Levard, Clement ;

Aguerre-Chariol, Olivier ;

Rose, Jerome .

CEMENT AND CONCRETE RESEARCH, 2015, 67 :138-147

[8] MULTIFRACTAL NATURE OF CONCRETE FRACTURE SURFACES AND SIZE EFFECTS ON NOMINAL FRACTURE ENERGY [J].

CARPINTERI, A ;

CHIAIA, B .

MATERIALS AND STRUCTURES, 1995, 28 (182) :435-443

[9] DIRECT DETERMINATION OF THE F(ALPHA) SINGULARITY SPECTRUM [J].

CHHABRA, A ;

JENSEN, RV .

PHYSICAL REVIEW LETTERS, 1989, 62 (12) :1327-1330

[10] The microstructure of cement paste and concrete - a visual primer [J].

Diamond, S .

CEMENT & CONCRETE COMPOSITES, 2004, 26 (08) :919-933

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