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Influence of silica fume on drying shrinkage of alkali-activated carbon steel slag
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Drying shrinkage is an important factor affecting the durability of alkali-activated materials.The drying shrinkage of alkali-activated carbon steel slag and the effect of silica fume substitution were studied.The drying shrinkage test lasted for 300 d.The compressive strength,flexural strength,Vickers hardness,mass recovery and drying shrinkage recovery of the samples after drying shrinkage were tested.The hydration products and microstructure were characterized by X-ray diffraction,mercury intrusion porosimetry,thermogravimetry-differential thermogravimetry,and scanning electron microscopy-energy dispersive spectroscopy.The results show that although the chemical expansion compensates for the drying shrinkage in 42 d,the drying shrinkage increases continuously within 300 d.Silica fume affects drying shrinkage by refining pore size and increasing matrix microhardness.Solid surface tension and capillary pressure are the driving forces for drying shrinkage in the early and middle to late stages,respectively.The evolution of drying shrinkage is also influenced by chemical expansion,matrix microhardness and macropore collapse.
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