Improving the chloride binding capacity of cement paste by adding nano-Al2O3: The cases of blended cement pastes

摘要: Abstract Chloride ingress is one of the main causes for degradation reinforced concrete structures. Increasing chloride binding capacity generally thought as a feasible way to restrain ingress. In our previous study, γ-phase nano-Al2O3 (NA) was found be beneficial improving plain Portland cement paste result formation additional Friedel’s salt. Herewith, cases blended pastes were further investigated, into which supplementary cementitious materials (SCMs) incorporated, including fly ash (FA), blast furnace slag (SL) and silica fume (SF). NA with dosage 1% 2% introduced paste, determined conventional equilibrium method. The results showed that use even viable improve pastes. X-ray diffraction (XRD)/Rietveld refinement method thermogravimetric analysis (TGA) performed unravel phase assemblages change upon exposure. It revealed besides more salt, addition could allow enhanced physical C-A-S-H, i.e., substitution Si by Al in C-S-H gel.