Chloride binding behavior of synthesized reaction products in alkali-activated slag

被引:44
作者
Cai, Weixi [1 ]
Xu, Zhipeng [1 ]
Zhang, Zhangmin [1 ]
Hu, Jie [1 ]
Huang, Haoliang [1 ]
Ma, Yuwei [2 ]
Zhang, Zuhua [3 ]
Wang, Hao [4 ]
Yin, Suhong [1 ]
Wei, Jiangxiong [1 ]
Shi, Caijun [3 ]
Yu, Qijun [1 ]
机构
[1] South China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510640, Peoples R China
[2] Guangzhou Univ, Res Ctr Wind Engn & Engn Vibrat, Guangzhou 510006, Peoples R China
[3] Hunan Univ, Coll Civil Engn, Key Lab Green & Adv Civil Engn Mat & Applicat Tech, Changsha 410082, Peoples R China
[4] Univ Southern Queensland, Ctr Future Mat, Toowoomba, Qld 4350, Australia
基金
中国国家自然科学基金;
关键词
Chloride binding; Alkali-activated slag; C-(A)-S-H gels; LDHs; Chemical composition; Surface properties; LAYERED DOUBLE HYDROXIDES; HYDROTALCITE-LIKE COMPOUNDS; CALCIUM-SILICATE-HYDRATE; BLAST-FURNACE SLAG; C-S-H; MOLECULAR-DYNAMICS; FLY-ASH; MG-AL; NANO-PORES; CEMENT;
D O I
10.1016/j.compositesb.2022.109919
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The chemical composition and surface properties of reaction products in alkali activated slag (AAS) are different from ordinary Portland cement, thus significantly affect their chloride binding behavior. The objective of this study is to investigate the relationship between physical/chemical characteristics and chloride binding capacity of the reaction products in AAS, i.e. C-S-H gel, C-A-S-H gel and LDHs. In this study, typical reaction products with different chemical compositions in AAS were chemically synthesized and characterized by XRD, NMR, BET and zeta potential. The chloride binding capacity of synthesized reaction products was evaluated in neutral and alkaline NaCl solution. The results indicate that C-S-H and C-A-S-H gels bind chlorides more physically. The increase of Ca/Si ratio and Al/Si ratio results in more positive zeta potential, which is beneficial for chloride binding of C-(A)-S-H gels. Further, the chloride binding capacity of C-A-S-H gels is higher than C-S-H gel, due to more positive zeta potential and larger layer spacing in the presence of Al. LDHs possess higher chloride binding capacity than C-(A)-S-H gels, due to its higher specific surface area (120.3-125.5 m(2)/g) and positive zeta po-tential (22.5-28.5 mV); the increase of Mg/Al ratio results in increased layer spacing and subsequently higher chloride binding capacity. The physical binding contributed most chloride binding of LDHs; due to the difficulty of exchange between Cl- and intercalated CO32- in Mg-Al LDH, its chemical binding is weak, which is resulted from the entering of chlorides into the interlayer from the edge of LDHs.
引用
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页数:19
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