Damage evolution and plasticity development of concrete materials subjected to freeze-thaw during the load process. (December 2019)

• Record Type: Journal Article
• Authors: Sun, Ming; Xin, Dabo; Zou, Chaoying
• Is Part Of: Mechanics of materials. Volume 139(2019)
• Publication Date: 2019-12
• Subjects: Damage evolution -- Plasticity development -- Concrete -- Freeze-thaw -- Constitutive model; Strength of materials -- Periodicals; Mechanics, Applied -- Periodicals; Résistance des matériaux -- Périodiques; Mécanique appliquée -- Périodiques; Mechanics, Applied; Strength of materials; Periodicals; Electronic journals; 620.11
• DOI: 10.1016/j.mechmat.2019.103192
• Languages: English
• ISSNs: 0167-6636

Abstract

Highlights: A cohesion reduction parameter could improve the calculation accuracy of model. Proposed freeze-thaw damage constitutive model was validated by previous data. Damage evolution and plasticity development during load process were calculated. Simulations could reflect the effect of air entraining agent on frost resistance. Abstract: Freeze-thaw has a severe degradation effect on concrete materials, especially in cold regions. The damage evolution and plasticity development of concrete materials subjected to freeze-thaw during the load process are essential to improve the frost durability of concrete structures. In this paper, a cohesion reduction parameter is proposed to improve the accuracy of previous damage constitutive models for concrete materials. The value of parameter is determined by a theoretical proof, which is verified by a series of simulations. Followed, freeze-thaw degradation models are established by previous research work to describe the freeze-thaw degradation behaviors on the mechanical properties of concrete materials. These degradation models are applied into the mentioned constitutive model to establish the freeze-thaw damage constitutive model, which can reflect the constitutive relationship of concrete materials subjected to freeze-thaw damage. Additionally, a series of simulations are carried out to obtain the stress-strain relationships of concrete materials subjected to freeze-thaw cycles by proposed model. The calculation results have a good fit with corresponding test results. Finally, the calculation results are discussed to investigate the mechanism of damage evolution and plasticity development of concrete materials subjected to freeze-thaw cycles during the load process.