Experimental Study and Simulation Calculation of the Chloride Resistance of Concrete under Multiple Factors

Abstract

Cement is widely used in marine concrete, and its resistance to chloride ion corrosion has been widely considered. In this paper, based on a laboratory test, the influence of different hydrostatic pressures, coarse aggregate contents and w/c ratios on the chloride resistance performance is analyzed. Based on COMSOL finite element software, a two-dimensional cementitious materials model is established, and the simulation results are compared with the experimental results. The results show that the penetration depth of chloride ions in cement increases with the increase of the w/c ratio. Under the hydrostatic pressure of 0 MPa, when the w/c ratio is 0.35, the penetration depth of chloride ions is 7.4 mm, and the simulation result is 8.0 mm. When the w/c ratio is 0.45, the penetration depth of chloride ions is 9.3 mm, and the simulation result is 9.9 mm. When the w/c ratio is 0.55, the penetration depth of chloride ions is 12.9 mm, and the simulation result is 12.1 mm. Under different hydrostatic pressures, the penetration depth of chloride ions obviously changes, and with the increase in hydrostatic pressure, the penetration depth of chloride ions deepens. Under the w/c ratio of 0.35, when the hydrostatic pressure is 0.5 MPa, the penetration depth of chloride ions is 11.3 mm, and the simulation result is 12.1 mm. When the hydrostatic pressure is 1.0 MPa, the penetration depth of chloride ions is 16.2 mm, and the simulation result is 17.5 mm.

Predicting the life cycle durability and ecological performance of cementitious coatings with a fuzzy‐stochastics–based approach

“…The first step of fuzzification involves the sampling of objective test data. The experimentally obtained age factor and the mean of initial chloride diffusion coefficient of uncracked (Chen et al., 2021; Ding et al., 2021; Dousti et al., 2013; Frederiksen et al., 1997; Hu & Xia, 2022; Jasielec et al., 2020; Leng et al., 2000; Lin & Yang, 2019; Lin et al., 2013; Liu et al., 2015; McNally & Sheils, 2012; Nguyen et al., 2009; Oh & Jang, 2004; Paul et al., 2016; Sahmaran et al., 2007; Sahmaran & Li, 2009; Si & Feng, 2018; Sun et al., 2020; Tian et al., 2020; Xu & Cai, 2010; Zhang & Kong, 2010; Zhang et al., 2018, 2021; Zhao et al., 2020) and cracked (Hu, 2021; Kwon et al., 2009; Lee et al., 2014; Lu et al., 2014; Mu et al., 2013; Ozyurt et al., 2020; Paul et al., 2016; Rodriguez & Hooton, 2003; Sahmaran et al., 2007; Wang et al., 2016; Zha, 2016) cementitious materials are summarized in Appendices A and B, respectively.…”

Evolution Law of Structural Form and Heat Transfer Performance of Thermal Insulation System

“…In this paper, the solid heat conduction was simulated using the powerful finite element function of COMSOL. The formula for this simulation is as follows [ 48 ]: where is the material density (kg/m 3 ), is the specific heat capacity (J/kgK), is the gradient operator, T is the temperature (K), λ is the thermal conductivity (W/mK), and Q is the total heat of the materials (J).…”

Influence of Wind Speed, Wind Direction and Turbulence Model for Bridge Hanger: A Case Study

“…Regarding the boundary conditions of the bridge hangers, they have a fixed constraint on the upper and lower. COMSOL Multiphysics is a general finite element software that can be used to calculate fluid dynamics, solid mechanics, multifield coupling, and so forth [38]. Regarding the finite element model, the left boundary is the wind speed inlet, the right boundary is the outlet, and the upper and lower boundaries are slip boundaries, which are the same COMSOL Multiphysics is a general finite element software that can be used to calculate fluid dynamics, solid mechanics, multifield coupling, and so forth [38].…”

“…COMSOL Multiphysics is a general finite element software that can be used to calculate fluid dynamics, solid mechanics, multifield coupling, and so forth [38]. Regarding the finite element model, the left boundary is the wind speed inlet, the right boundary is the outlet, and the upper and lower boundaries are slip boundaries, which are the same COMSOL Multiphysics is a general finite element software that can be used to calculate fluid dynamics, solid mechanics, multifield coupling, and so forth [38]. Regarding the finite element model, the left boundary is the wind speed inlet, the right boundary is the outlet, and the upper and lower boundaries are slip boundaries, which are the same boundary conditions with a wind tunnel test.…”