4.6 Article

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

期刊

SUSTAINABILITY
卷 13, 期 8, 页码 -

出版社

MDPI
DOI: 10.3390/su13084169

关键词

marine sand; chloride binding; microstructure; mortar

资金

  1. Natural Science Key Foundation of Shandong Province [ZR2020KE046]
  2. Basic Science Research Project of Nantong City [JC2020125]
  3. National Natural Science Foundation of China [41827805]
  4. Strategic Priority Project of CAS [XDA13040402]

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This study investigated the chloride binding capacity and its effect on the microstructure of mortar made with different types of sand. The results showed diffusion trend of chloride ions, changes in chloride contents, formation of Friedel's salt, and increase in fine capillary pore volume.
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 center dot CaCl2 center dot 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.

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