Influence of cation types on the stability of bound chloride ions in cement mortar simultaneously under electric field and SO42− attack

Chu, Huaqiang; Pan, Congling; Guo, Ming-Zhi; Cao, Li; Zhu, Zhengyu; Zhang, Song; Jiang, Linhua

doi:10.1016/j.conbuildmat.2020.118402

Cited by 10 publications

(2 citation statements)

References 20 publications

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“…He Yi et al [10] thought that the higher carboxyl group content of PCE molecules would facilitate the dispersion of cement particles. Chu Hongqiang et al [11] found that SO 4 2− would increase the dissolution concentration of Ca 2+ in calcium-silicate-hydrate gel (C-S-H), which increased polycarboxylate superplasticizer aggregates and sharply reduced PCE molecule dispersion in Portland cement. Therefore, it is necessary to strictly control the content of PCE in a concrete system.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Effects of Polyurethane-Modified Polycarboxylate at Ambient Temperature on the Characteristics of Cement with Supplementary Cementitious Materials

Xiang,

Zheng,

Zhang

et al. 2023

Polymers

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Via radical polymerization, three polyurethane-modified polycarboxylate molecules of various comb topologies were synthesized. This study investigated the effects of varying types and concentrations of supplementary cementitious materials (SCMs) on the surface tension, flowability, and zeta potential of cement. An elevation in the molar ratio between isoamyl alcohol polyoxyethylene (TPEG) and acrylic acid (AA) from 1:1 to 5:1 reduced the surface tension of the polycarboxylate molecule from 47.70 mN/m to 35.53 mN/m and increased flowability from 280 mm to 310 mm, as the results indicated. An increase in the SCM and polycarboxylate dosage proportionally decreased liquid-phase surface tension and increased flowability. A decrease in the water-to-cement (w/c) ratio from 0.5 to 0.3 corresponded to an observed increase in the zeta potential of cement pastes. However, a rise in the quantity of polycarboxylate and SCMs corresponded to a decrease in the zeta potential at a w/c ratio of 0.3.

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Section: Introductionmentioning

confidence: 99%

Investigation of the Effects of Polyurethane-Modified Polycarboxylate at Ambient Temperature on the Characteristics of Cement with Supplementary Cementitious Materials

Xiang,

Zheng,

Zhang

et al. 2023

Polymers

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“…[ 12 , 19 , 20 , 21 , 22 , 23 ]; however, the components of NaCl diffusion source solution are not similar to those in the actual environment, such as marine engineering and underground engineering environment. With the deepening of research, some researchers [ 24 , 25 , 26 ] have paid attention to the influence of the cationic type on the diffusion behavior of chloride. Kondo [ 27 ] and Ushiyama et al [ 28 ] studied the diffusion behavior of chloride in hardened cement paste under different chloride by diffusion cell and found that the relationship of the chloride diffusion coefficient is D Cl (MgCl 2 ) > D Cl (CaCl 2 ) > D Cl (LiCl) > D Cl (KCl) > D Cl (NaCl).…”

Section: Introductionmentioning

confidence: 99%

Influence of Hydrostatic Pressure and Cationic Type on the Diffusion Behavior of Chloride in Concrete

Liu

Jiang

2021

Materials

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The durability of the concrete in underground and marine engineering is affected by the underground and ocean environment. Chloride diffusion coefficient under hydrostatic pressure is a key parameter of concrete durability design under corresponding conditions. Therefore, this paper studies the diffusion behavior of chloride in different diffusion source solutions by experiment and simulation. Based on the experimental results, this paper proposes a new chloride diffusion model under the coupling effect of diffusion and convection. The interaction of ions and compounds in the diffusion source solutions, concrete pore fluid, and concrete material are considered in the new chloride diffusion model. The experimental results show that chloride diffusion rate is significantly affected by hydrostatic pressure, which increases with the increase of hydrostatic pressure. The chloride diffusion coefficient shows a certain difference in difference diffusion source solutions. The chloride diffusion coefficient in divalent cationic diffusion source solutions is the largest, the chloride diffusion coefficient in the divalent and monovalent cationic compound ones is in the middle, and the chloride diffusion coefficient in the monovalent cationic ones is the smallest. There is a linear relationship between the chloride diffusion coefficient and the hydrostatic pressure whether in single or combined cationic diffusion source solutions.

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Electrochemical chloride extraction on reinforced concrete contaminated external chloride: Efficiencies of intermittent applications and impacts on hydration products

Nguyen

Trần

Pansuk

et al. 2021

Cement and Concrete Composites

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Influence of cation types on the stability of bound chloride ions in cement mortar simultaneously under electric field and SO42− attack

Cited by 10 publications

References 20 publications

Investigation of the Effects of Polyurethane-Modified Polycarboxylate at Ambient Temperature on the Characteristics of Cement with Supplementary Cementitious Materials

Investigation of the Effects of Polyurethane-Modified Polycarboxylate at Ambient Temperature on the Characteristics of Cement with Supplementary Cementitious Materials

Influence of Hydrostatic Pressure and Cationic Type on the Diffusion Behavior of Chloride in Concrete

Electrochemical chloride extraction on reinforced concrete contaminated external chloride: Efficiencies of intermittent applications and impacts on hydration products

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