Mechanical Property and Mechanism Analysis of Steel Slag Powder Modified Red Beds Stuffing
To study the mechanical property and mechanism of steel slag powder modified red beds stuffing,the mechanical properties were studied with heavy compaction,unconfined,direct shear and confined compression tests.The microstructure and mechanism of interface were analyzed by using X-ray diffraction,infrared spectroscopy,nuclear magnetic resonance,laser particle size,and scanning electron microscopy.The result indicates that the steel slag powder has good effect on the mechanical strength and water stability of red beds stuffing.The compressive strength of modified stuffing with 15%steel slag powder increases from 0.6 MPa in plain soil to 1.5 MPa;the compressive strength of impregnated stuffing gradually increases from the state of wet disintegration to 0.8 MPa;and the mechanical strength and wet disintegration characteristics are significantly improved.Further,the mechanism of modified stuffing is revealed through microscopic analysis,including hydration and ion exchange reaction.Based on X-ray diffraction and infrared spectroscopy,it is shown that SiO2 peak is weakened,C—S—H peak is enhanced,and Al3+ion coordination vibration peak is enhanced.Under the action of strong ions,the double electric beds thickness of soil particles is reduced.NMR and laser particle size analysis show that the pore distribution curve of modified stuffing is optimized,and the particle agglomeration is enhanced.That contributes to the formation of a more stable soil structure.By using scanning electron microscopy,the pore structure and contact form among soil particles are found to change.Inside the soil,the tightly arranged layered stacking or flocculated structures are formed,which improve the overall structure.Simultaneously,the particle fractal dimension was quantitatively analyzed,which reflected the variation rule of shear strength indicators of the improved stuffing.The relation between shear strength indicator of the improved stuffing and its microstructure was established.
road engineeringmechanical propertyscanning electron microscopyred beds stuffingmechanismsteel slag powder
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