钢渣-沥青界面黏附特性研究

Research on adhesion characteristics of steel slag-asphalt interface

为研究钢渣-沥青界面黏附机理,以石灰岩为对照,采用压汞仪、傅里叶红外光谱仪、接触角仪、原子力显微镜、扫描电镜从孔隙吸附、化学反应、表面黏结3个角度揭示钢渣-沥青界面作用,结合室内试验评价钢渣集料水稳定性.结果表明,钢渣孔体积、孔隙率均比石灰岩的大,以小孔、中孔为主;钢渣能与沥青发生化学反应,钢渣与沥青接触角小于石灰岩与沥青的;钢渣粗糙度、表面积、黏附力均大于石灰岩的;钢渣集料水稳定性能优于石灰岩的.即钢渣集料因其优越的孔隙吸附能力、活跃的化学成分、粗糙的表面纹理具备更强的吸附沥青特性.

In order to study the adhesion mechanism of steel slag-asphalt interface,with limestone as the control,mercury porosimeter,Fourier infrared spectrometer,contact angle meter,atomic force microscope,scanning electron microscope were used to reveal steel slag-asphalt interface effect from three angles of pore adsorption,chemical reaction and surface adhesion.Combined with laboratory tests,the water stability of steel slag aggregates was investigated.The results show that the pore volume and porosity of steel slag are larger than those of limestone,and the pores are mainly small pores and mesopores.Steel slag can chemically react with asphalt,and the contact angle between steel slag and asphalt is smaller than that between limestone and asphalt.The roughness,surface area and adhesion of steel slag are larger than those of limestone.The water stability of steel slag aggregate is better than that of limestone.That is to say,steel slag aggregate has stronger asphalt adsorption characteristics due to its superior pore adsorption capacity,active chemical composition and rough surface texture.