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3D meso-scale modelling of foamed concrete based on X-ray Computed Tomography

Nguyen, Tuan, Ghazlan, Abdallah, Kashani, Alireza, Bordas, Stéphane ORCID: and Ngo, Tuan 2018. 3D meso-scale modelling of foamed concrete based on X-ray Computed Tomography. Construction and Building Materials 188 , pp. 583-598. 10.1016/j.conbuildmat.2018.08.085

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Foamed concrete has been widely used in infrastructure construction and poses new challenges to design and modelling. This paper investigates the behaviour of foamed concrete with the help of X-ray Computed Tomography (XCT), which is capable of characterising the microstructure of foamed concrete. An in situ compressive test-XCT scan is carried out to observe the failure mechanism of foamed concrete by XCT when subjected to compression load. A meso-scale simulation based on XCT images is conducted to simulate the behaviour of foamed concrete. An algorithm that directly reconstructs the meso-scale model from XCT images is developed. The experimental and numerical results show that foamed concrete exhibits a significant change in mechanical behaviour; it is less brittle compared to the response of dense samples. However, the reduction in the level of brittleness is accompanied by a significant decrease in compressive strength. Failure development inside samples is successfully captured by the XCT scan and the meso-scale modelling. The topology of foamed structures, in particular the chain of interconnected pores, influences the failure mechanism of foamed concrete. The combination of XCT scan and meso-scale modelling provides a comprehensive framework to understand the mechanical behaviour of foamed concrete.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Publisher: Elsevier
ISSN: 0950-0618
Date of Acceptance: 15 August 2018
Last Modified: 25 Oct 2022 13:39

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