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In-situ X-ray computed tomography characterisation of 3D fracture evolution and image-based numerical homogenisation of concrete

Abstract:
In-situ micro X-ray Computed Tomography (XCT) tests of concrete cubes under progressive compressive loading were carried out to study 3D fracture evolution. Both direct segmentation of the tomography and digital volume correlation (DVC) mapping of the displacement field were used to characterise the fracture evolution. Realistic XCT-image based finite element (FE) models under periodic boundaries were built for asymptotic homogenisation of elastic properties of the concrete cube with Young's moduli of cement and aggregates measured by micro-indentation tests. It is found that the elastic moduli obtained from the DVC analysis and the FE homogenisation are comparable and both within the Reuss-Voigt theoretical bounds, and these advanced techniques (in-situ XCT, DVC, micro-indentation and image-based simulations) offer highly-accurate, complementary functionalities for both qualitative understanding of complex 3D damage and fracture evolution and quantitative evaluation of key material properties of concrete.
Publication status:
Published
Peer review status:
Peer reviewed

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Publisher copy:
10.1016/j.cemconcomp.2016.10.001

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Grant:
“QUBE:quasi-brittlefracture:a3Dexperimentally-validatedapproach”(EP/J019763/1
EP/J019992/1

Publisher:
Elsevier
Journal:
Cement and Concrete Composites More from this journal
Volume:
75
Pages:
74–83
Publication date:
2016-10-05
Acceptance date:
2016-10-01
DOI:
EISSN:
1873-393X
ISSN:
0958-9465

Language:
English
Keywords:
Pubs id:
pubs:647767
UUID:
uuid:aec09f14-3554-4dd8-af87-f823051558db
Local pid:
pubs:647767
Source identifiers:
647767
Deposit date:
2016-10-03

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