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- W3100909041 abstract "Calcium silicate hydrate (C-S-H), the most important Portland cement hydration product, determines the mechanical properties and durability of cementitious materials. In marine environment, C-S-H often suffers from sulfate attack – one of the most common and severe degradations for concrete. pH is considered as a critical factor in determining the deterioration behavior of C-S-H during sulfate attack, of which the significance may be overlooked. This study focused on the role of pH on the deterioration of C-S-H in terms of the composition and nano/micro structure under sulfate attack. The results show that lowering pH aggravates the decalcification of C-S-H, whereas a strong alkaline condition is beneficial to increase the resistance to deterioration. An increase in the mean chain length together with the proportion of large pores (>10 nm) is observed when C-S-H is subjected to low-pH sulfate attack (pH = 10–12), resulting in a relatively loose structure. The deep analysis on defective tobermorite model reveals that calcium at the interlayer of C-S-H nanostructure is readily removed under sulfate attack, thereby improving the potential of Si-O-Si groups formation and increases the mean chain length of C-S-H." @default.
- W3100909041 created "2020-11-23" @default.
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- W3100909041 date "2021-02-01" @default.
- W3100909041 modified "2023-10-11" @default.
- W3100909041 title "Effects of pH on the nano/micro structure of calcium silicate hydrate (C-S-H) under sulfate attack" @default.
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- W3100909041 doi "https://doi.org/10.1016/j.cemconres.2020.106306" @default.
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