Mesoscale analysis for mortar deterioration during freeze-thaw modification of recycled coarse aggregate

IF 4.7 3区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of Sustainable Cement-Based Materials Pub Date : 2023-08-11 DOI:10.1080/21650373.2023.2243470

F. Gong, Zhao Wang, Liu Yang, Yingjie Ning, Tamon Ueda

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Abstract

Freeze-thaw modification of recycled coarse aggregate (RCA) is capable to remove the attached mortar efficiently, which can promote the usage of such eco-friendly recycled construction materials. To produce natural coarse aggregate (NCA) without introducing additional damage by this method, it is important to know the frost resistance of attached mortar in RCA. This paper presents a mesoscale analysis of mortar deterioration during freeze-thaw modification of RCA. The pore size distribution, pore pressure induced from ice formation, meso-scale constitutive laws are modeled and integrated with the discrete element method—Rigid Body Spring Model. The deformation during FTC, crack patterns and the mechanical behaviors are simulated with three typical types of RCA. Experiment results are also adopted to qualitatively show the effectiveness of such freeze-thaw modification. Finally, an empirical model to calculate the deteriorated mechanical properties of RCA is developed according to the numerical analysis.

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再生粗骨料冻融改性砂浆劣化的中尺度分析

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来源期刊

Journal of Sustainable Cement-Based Materials Multiple-

CiteScore

6.60

自引率

15.90%

发文量

期刊介绍： The Journal of Sustainable Cement-Based Materials aims to publish theoretical and applied researches on materials, products and structures that incorporate cement. The journal is a forum for discussion of research on manufacture, hydration and performance of cement-based materials; novel experimental techniques; the latest analytical and modelling methods; the examination and the diagnosis of real cement and concrete structures; and the potential for improved cement-based materials. The journal welcomes original research papers, major reviews, rapid communications and selected conference papers. The Journal of Sustainable Cement-Based Materials covers a wide range of topics within its subject category, including but are not limited to: • raw materials and manufacture of cement • mixing, rheology and hydration • admixtures • structural characteristics and performance of cement-based materials • characterisation techniques and modeling • use of fibre in cement based-materials • degradation and repair of cement-based materials • novel testing techniques and applications • waste management