Chloride Binding Capacity and Its Effect on the Microstructure of Mortar Made with Marine Sand

Congtao Sun, Ming Sun, Tao Tao, Feng Qu, Gongxun Wang, Peng Zhang, Yantao Li and Jizhou Duan
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Congtao Sun: Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
Ming Sun: School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China
Tao Tao: School of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, China
Feng Qu: School of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, China
Gongxun Wang: School of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, China
Peng Zhang: School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China
Yantao Li: Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
Jizhou Duan: Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China

Sustainability, 2021, vol. 13, issue 8, 1-12

Abstract: Chloride binding capacity and its effect on the microstructure of mortar made with marine sand (MS), washed MS (WMS) and river sand (RS) were investigated in this study. The chloride contents, hydration products, micromorphology and pore structures of mortars were analyzed. The results showed that there was a diffusion trend for chloride ions from the surface of fine aggregate to cement hydrated products. During the whole curing period, the free chloride content in the mortars made by MS and WMS increased firstly, then decreased and stabilized finally with time. However, the total chloride content of three types of mortar hardly changed. The bound chloride content in the mortars made by MS and WMS slightly increased with time, and the bound chloride content included the MS, the WMS and the RS arranged from high to low. C 3 A·CaCl 2 ·10H 2 O (Friedel’s salt) was formed at the early age and existed throughout the curing period. Moreover, the volume of fine capillary pore with a size of 10–100 nm increased in the MS and WMS mortar.

Keywords: marine sand; chloride binding; microstructure; mortar (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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