Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 188, Issue -, Pages 583-598Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2018.08.085
Keywords
Foamed concrete; X-ray computed tomography; Mesa-scale modelling; XCT based modelling; Damage plasticity model
Categories
Funding
- University of Melbourne
- ARC Centre for Advanced Manufacturing of Prefabricated Housing (ARC Grant) [IC150100023]
- Trace Analysis for Chemical, Earth and Environmental Sciences (TrACEES) platform from the Melbourne Collaborative Infrastructure Research Program at the University of Melbourne
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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 mesa-scale modelling provides a comprehensive framework to understand the mechanical behaviour of foamed concrete. (C) 2018 Elsevier Ltd. All rights reserved.
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