Chloride Resistance of Concrete with Marine Blended Cement Using Corrosion Resistant Mineral Admixture

Bae, Jae-Hyeong; Shin, Kyung-Hun; Hyun, Jung Hwan; Jang, Young Il; Kim, Seong Su

doi:10.4028/www.scientific.net/amr.831.23

Cited by 4 publications

(2 citation statements)

References 3 publications

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“…At the present time, the technology of recycled concrete is one of the most effective ways of dealing with the recycling of waste concrete [2]. As a major cause of deterioration of the durability performance of concrete structures, chloride ions (Cl -) [3], when the Clcontent superficial the reinforcement reaches a critical value, the passivation film on the surface will be damaged, which will lead to corrosion and degradation of the force performance of the reinforcement [4], and the complex source of recycled aggregate composition, macroscopic tests produce greater dispersion, the progress of computer technology and numerical simulations can both reduce this error and intuitively visualize the diffusion behavior of Clinto the concrete, linking the fine structure to the macroscopic properties. In recent years, scholars at home and abroad have viewed recycled concrete as a five-phase composite at the fine level.…”

Section: Introductionmentioning

confidence: 99%

Study on Chloride Diffusion Behaviors of Recycled Concrete of Random Aggregates

Yao,

Zhang,

Linghu

et al. 2023

J. Phys.: Conf. Ser.

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Based on the chloride ions (Cl−) diffusion model and aggregate grading theory, PYTHON and COMSOL are used to construct a mesoscopic model of recycled concrete random polygon aggregate and verify its validity in combination with existing experimental results. The diffusion law of Cl− in recycled concrete and the law of influence of critical factors on the Cl− erosion resistance are studied by calculating and analyzing the Cl− erosion resistance of recycled concrete under different working conditions such as the diffusivity of new and old mortar, the thickness of old mortar and the replacement ratio of recycled aggregate. The results show that the simulation results agree well with the test results, and the method can better reproduce the Cl− diffusion process inside the recycled concrete. There are discontinuous features based on the relationship curves between the Cl− concentration and the depth of the recycled concrete. The Cl− concentration inside the concrete gradually increases with the increase of the diffusion rate of the old and new mortars. The resistance behavior of the recycled concrete to Cl− attack decreases with the increase of the thickness of the old mortar.

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Section: Introductionmentioning

confidence: 99%

Study on Chloride Diffusion Behaviors of Recycled Concrete of Random Aggregates

Yao,

Zhang,

Linghu

et al. 2023

J. Phys.: Conf. Ser.

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“…Traditional research of the transmission of chloride ions in concrete considers only the diffusion effect, induces the analytical solution of chloride concentration based on the partial differential equation of the Fick's second law [13][14][15][16][17], and modifies the equations according to the service environment [18][19][20]. Since the transmission mechanism of chloride ion is complex and the parameters for the partial differential equation are a lot, there is no accepted and precise analytical formula for chloride concentration.…”

Section: Introductionmentioning

confidence: 99%

Concentration Distribution of Chloride Ion under the Influence of the Convection-Diffusion Coupling

Zhao

Zhang

2017

Advances in Materials Science and Engineering

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The transfer process of chloride ion under the action of the convection-diffusion coupling was analyzed in order to predict the corrosion of reinforcement and the durability of structure more accurately. Considering the time-varying properties of diffusion coefficient and the space-time effect of the convection velocity, the differential equation for chloride ion transfer under the action of the convection-diffusion coupling was constructed. And then the chloride ion transfer model was validated by the existing experimental datum and the actual project datum. The results showed that when only diffusion was considered, the chlorine ion concentration increased with the time and decreased with the decay index of time. Under the action of the convection-diffusion coupling, at each point of coupling region, the chloride ion concentration first increased and then decreased and tended to stabilize, and the maximum appeared at the moment of convection velocity being 0; in the diffusion zone, the chloride ion concentration increased over time, and the chloride ion concentration of the same location increased with the depth of convection (in the later period), the velocity of convection (in the early period), and the chloride ion concentration of the surface.

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