Effect of Chemical Components of Blast Furnace Slag on Microstructure Evolution of Silicate Polymerization
The components synergistic affect the structure formation and complexity of anionic polymerization of blast furnace slag directly.The structure evolution of silicate polymerization with different R2,ω(MgO)/ω(Al2 O3)and ω(Al2O3)changes was studied in this paper,thermodynamic calculation was used to determine the temperature rise regime and node for interrupting of the experiment.According to Raman spectrum analysis,it was found that when R2 and ω(MgO)/ω(Al2 O3)increased,the silicate anion groups in the blast furnace slag depolymerization occurred,and the structural units from Q4,Q3 to Q0,Q1 and Q2 evolved,resulting in the deterioration of structural stability and the enhancement of slag fluidity.When the alkalinity is greater than 1.2,ω(MgO)/ω(Al2O3)is greater than 0.55,there is a reverse transformation or slowing trend.With the increase of ω(Al2O3),it can be seen that the relative content of Q0 changes little,the relative content of Q1 increases first and then decreases,the relative content of Q2 decreases significantly,the relative content of Q3 increases significantly,the overall relative content of Q4 shows an increasing trends,the slag cluster structure tends to be complex,and the non-bridge oxygen content in the slag system shows a slow decreasing trend.When the content of ω(Al2O3)exceeds 16％,the downward trend is more obvious.
blast furnace slagsilicate structural unitdegree of polymerizationnon-bridge oxygen
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