Molecular dynamics simulation was utilized to investigate the transport and adsorption of chloride in the nanopore of calcium aluminosilicate hydrate(C-A-S-H)with associated cation types of Ca,Mg,Na and K.The local ionic structure,atomic dynamics and bond stability were analyzed to elucidate the interaction between cations and chloride ions.The results show that interfacial chloride is absorbed through the ion pairing formation in the vicinity of C-A-S-H substrate.Interfacial cations can simultaneously interact aluminosilicate chains,water molecules and Cl-ions,which restrict the motion of interfacial Cl ions.Pore solution chloride can be immobilized through the solvation effect of cations.Cations along with their hydration shell can connect to neighboring Cl-ions to decrease their mobility.Owing to the varied ionic chemistry,cations show different interaction strength with neighboring water molecules and anions,which determines the chloride transport behavior in the nanopore of C-A-S-H.The chloride immobilization capacity of C-A-S-H nanopore with different associated cations is listed in following order:Mg2+＜Ca2+＜Na+≈K+,which agrees reasonably with previous experiments.

YANG Jun;ZHANG Gaozhan;DING Qingjun;WANG Aiguo;HOU Dongshuai

Anhui Province Engineering Laboratory of Advanced Building Materials,School of Materials and Chemical Engineering,Anhui Jianzhu University,Hefei 230601,China;State Key Laboratory of Silicate Materials for Architectures,School of Materials Science and Engineer-ing,Wuhan University of Technology,Wuhan 430070,China;School of Materials Science and Engineering,Department of Civil Engineer-ing,Qingdao University of Technology,Qingdao 266033,China

武汉理工大学学报（材料科学版）（英文版）

[1]YANG Jun;ZHANG Gaozhan;DING Qingjun;WANG Aiguo;HOU Dongshuai-.Influence of Associated Cations on the Transport and Adsorption of Chloride Ions in the Nano-channel of Calcium Aluminosilicate Hydrate Gel:A Molecular Dynamics Study)[J].武汉理工大学学报（材料科学版）（英文版）,2022(05):963-976

Aluminosilicate

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