Abstract
By means of 29Si and 27Al magic angle spinning nuclear magnetic resonance (MAS NMR) combined with deconvolution technique, X-ray diffraction (XRD), scanning electron microscopy (SEM) as well as energy dispersive X-ray system(EDX), the effect of 5 wt% corrosive solutions (viz. 5 wt% Na2SO4, MgSO4, Na2SO4+NaCl and Na2SO4+NaCl+Na2CO3) on C-S-H microstructure in Portland cement containing 30 wt% fly ash was investigated.The results show that, in MgSO4 solution, Mg2+ promotes the decalcification of C-S-H by SO 2-4 ,increasing silicate tetrahedra polymerization and mean chain length (MCL) of C-S-H. However, the substituting degree of Al3+ for Si4+ (Al[4]/Si) in the paste does not change evidently. Effect of Na2SO4 solution on C-S-H is not significantly influenced by NaCl solution, while the MCL and Al[4]/Si of C-S-H in fly ashcement paste slightly change. However, the decalcification of C-S-H by SO 2-4 and CO 2-3 attack, as well as the activation of fly ash by SO 2-4 attack will increase the MCL and Al[4]/Si, which are both higher than that under Na2SO4 corrosion, MgSO4 or Na2SO4 +NaCl coordination corrosion.
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Funded by the Major State Basic Research Development Program of China (“973”Program) (No. 2015CB655101), Natural Science Foundation of Hebei (No.E2016209283), National Natural Science Foundation of China(No.51402003), and Open Foundation of Road Bridge and Structural Engineering Key Laboratory WHUT, China (No.DQZDJJ201504)
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Ding, Q., Wang, H., Hu, C. et al. Effect of corrosive solutions on C-S-H microstructure in portland cement paste with fly ash. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 31, 1002–1007 (2016). https://doi.org/10.1007/s11595-016-1482-9
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DOI: https://doi.org/10.1007/s11595-016-1482-9