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Composites: Mechanics, Computations, Applications: An International Journal
ESCI SJR: 0.354 SNIP: 0.655 CiteScore™: 1.2

ISSN Imprimir: 2152-2057
ISSN En Línea: 2152-2073

Composites: Mechanics, Computations, Applications: An International Journal

DOI: 10.1615/CompMechComputApplIntJ.v9.i1.10
pages 1-16

INFLUENCE OF RANDOM AGGREGATES ON DIFFUSION BEHAVIOR OF CHLORIDE IONS IN CONCRETE BASED ON COMSOL SIMULATION

Shuangxi Zhou
School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang 330013, China
Zhen Han
School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang 330013, China
Lehua Yu
School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang 330013, China
Xing Wei
School of Civil Engineer and Architecture, East China Jiaotong University, Changbei Open and Developing District, Nanchang, 330013, China
Yongqi Wei
College of Civil Engineering, Tongji University, Shanghai 200092, China

SINOPSIS

In the previous paper, concrete was considered as a three-phase composite material consisting of aggregates, interfacial area, and mortar, and the random delivery model of aggregates in concrete was established by MATLAB software. In the paper, the model is introduced into COMSOL, and the effect of different aggregate contents and volume fractions of the interface on the diffusion of chloride ions is discussed. By means of design of experiment, the repeatability of the proposed model is verified and simulation precision is confirmed. The effectiveness of the model is tested by a comparative analysis of experimental data and simulated results. The simulation results show that the diffusion performance of chloride ions is restrained by the increase in the content of aggregates, which is manifested by a zigzag effect of the aggregate; the performance of the diffusion of chloride ions is accelerated with increase in the interfacial area, which is assumed as interfacial effect. From the simulated profiles, it can be seen that the acceleration becomes more obvious with increase of the content of aggregates.


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