In order to study the mechanical properties and mechanism of red layer filler modified by slag powder,the strength characteristics of red layer filler under different slag powder content were analyzed through unconfined com-pressive strengthand direct shear tests,and microscopic analysis methods such as X-ray diffraction,thermogravimet-ric analysis,infrared spectroscopy,laser particle size,nuclear magnetic resonance and scanning electron microscopy were used.The mechanism of soil improvement by slag powder is studied.The experimental results show that the slag powder can improve the mechanical strength and water stability of the red layer filler,and the unconfined com-pressive strength of the modified filler increases from 0.76 MPa to 3.10 MPa.The cohesion and internal friction An-gle are also significantly improved.By infrared spectroscopy,laser particle size and nuclear magnetic resonance analy-sis,it is found that the vibration peak of Al3+cationic coordination between the modified packing particles is en-hanced,the thickness of the double electric layer of clay minerals is reduced,the agglomeration of soil particles is sig-nificantly enhanced,and the pore distribution is optimized.The formation process of hydration products was proved by X-ray diffraction and thermogravimetric analysis.The specific action mechanism of the modified filler was ob-served by scanning electron microscopy:The primary effects are the filling effect and the cementing effect,with the cementing effect including hydration and ion exchange.Quantitative analysis of micrographs further indicates an in-crease in the complexity of the soil structure,as well as enhanced particle roughness and skeletal framework.
关键词
改良红层填料/矿渣微粉/力学特性/微观分析/作用机理
Key words
modified red layer filler/slag powder/mechanical properties/micro-analysis/action mechanism
维普
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