Characterization of the Porous Structure and Its Influence on Mechanical Properties of High-Content Steel Slag Powder-Cement Foamed Concrete
To investigate the relationship between pore structure and mechanical properties in high-content steel slag powder foamed concrete,X-ray computer tomography(X-CT)technology wasused to analyze variations of pore structure characteristic parameters of foamed concrete un-der different conditions,including steel slag powder content,water-cement ratios,and wet density levels.Meanwhile,using the grey correlation theory,analyzed the correlation between various pore structure characteristic parameters and mechanical properties of the concrete.The results revealed that an increase in steel slag powder content,or a decrease in wet density levels should lead to an increase of porosity,a decrease of sphericity values,and an increase of pore sizes.Conversely,an increase of water-cement ratio should decrease porosity,increase sphericity val-ues,and enlarge pore sizes.Spherical pores are the predominant pore type,and there is a negative correlation between sphericity values and pore volume.Characteristic parameters of pore structure are closely related to the compressive strength,and porosity has the greatest influence on the compressive strength.And the pore size smaller than 0.5 mm and between 0.5 mm to 1 mm have the greatest influence on compressive strength.Considering pore shapes,spherical pores exhibit the highest grey correlation,which indicates that the more similar the spherical pore has the greater influence on compressive strength.These findings hold practical implications for the resourceful recycling of steel slag waste.
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