Mesoscale Analysis of the Effect of Interfacial Transition Zone on the Compressive Damage of Concrete Based on Discrete Element Method.

Autor: Lei JJ; College of Architecture and Civil Engineering, Wenzhou University, Wenzhou 325000, China., Wu ZX; College of Architecture and Civil Engineering, Wenzhou University, Wenzhou 325000, China., Wen ZJ; Wenzhou Public Utilities Development Group Co., Ltd., Wenzhou 325000, China., Cheng ZS; College of Architecture and Civil Engineering, Wenzhou University, Wenzhou 325000, China., Zhu R; Shanghai Construction Group Co., Ltd., Shanghai 200080, China.
Jazyk: angličtina
Zdroj: Materials (Basel, Switzerland) [Materials (Basel)] 2022 Dec 10; Vol. 15 (24). Date of Electronic Publication: 2022 Dec 10.
DOI: 10.3390/ma15248840
Abstrakt: The coarse aggregate-mortar interface transition zone (ITZ) has a great influence on the mechanical properties of concrete, which cannot be easily studied using laboratory tests in the mesoscale. In this paper, a series of axial compression tests were conducted using the discrete element method (DEM) on concrete specimens for four phases: coarse aggregates, mortars, aggregate-mortar interface transition zones, and voids. The effects of ITZ strength on macroscopic stress and microscopic cracks under different strength reduction factors were investigated through axial compression testing. With the increase in interface transition strength, the compressive strength of the concrete becomes stronger; moreover, the number of cracks decreases, and the anisotropy of contact orientation becomes weaker. Meanwhile, the direction of crack development and the damage mode of compressed concrete specimens were also dependent on the coarse aggregate-mortar interface strength coefficient.
Databáze: MEDLINE
Externí odkaz:
Nepřihlášeným uživatelům se plný text nezobrazuje