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Open AccessArticle

Physical Mechanism of Concrete Damage under Compression

1
Sichuan Institute of Building Research, Chengdu 610081, China
2
School of Civil Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China
3
School of Civil Engineering and Architecture, Zhejiang Sci-Tech University, Hangzhou 310018, China
*
Author to whom correspondence should be addressed.
Materials 2019, 12(20), 3295; https://doi.org/10.3390/ma12203295
Received: 12 September 2019 / Revised: 4 October 2019 / Accepted: 9 October 2019 / Published: 11 October 2019
(This article belongs to the Special Issue Concrete and Construction Materials)
Although considerable effort has been taken regarding concrete damage, the physical mechanism of concrete damage under compression remains unknown. This paper presents, for the first time, the physical reality of the damage of concrete under compression in the view of statistical and probabilistic information (SPI) at the mesoscale. To investigate the mesoscale compressive fracture, the confined force chain buckling model is proposed; using which the mesoscale parameters concerned could be directly from nanoindentation by random field theory. Then, the mesoscale parameters could also be identified from macro-testing using the stochastic damage model. In addition, the link between these two mesoscale parameters could be established by the relative entropy. A good agreement between them from nano- and macro- testing when the constraint factor approaches around 33, indicates that the mesoscale parameters in the stochastic damage model could be verified through the present research. Our results suggest that concrete damage is strongly dependent on the mesoscale random failure, where meso-randomness originates from intrinsic meso-inhomogeneity and meso-fracture arises physically from the buckling of the confined force chain system. The mesoscale random buckling of the confined force chain system above tends to constitute the physical mechanism of concrete damage under compression. View Full-Text
Keywords: concrete; damage; compression; random field; nanoindentation; multiscale concrete; damage; compression; random field; nanoindentation; multiscale
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MDPI and ACS Style

Liu, H.; Ren, X.; Liang, S.; Li, J. Physical Mechanism of Concrete Damage under Compression. Materials 2019, 12, 3295.

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