基于流变特性的消石灰改性油污泥热解残渣沥青胶浆稳定性研究

为探究油污泥热解残渣沥青胶浆性能，实现其在道路工程中的应用，开展了消石灰改性油污泥热解残渣沥青胶浆稳定性与改性机理研究。通过扫描电镜和红外光谱试验分析油污泥热解残渣的理化性质；在此基础上通过沥青胶浆三大指标和黏度试验，解析消石灰改性油污泥热解残渣沥青胶浆的掺配比；通过沥青弯曲蠕变劲度(BBR)和动态剪切流变(DSR)等试验评价了消石灰改性油污泥热解残渣沥青胶浆水稳定性能及高低温流变性能；最后通过微观试验解析消石灰改性油污泥热解残渣沥青胶浆的微观界面特性和改性机理。结果表明：油污泥热解残渣存在以中大孔为主、微小孔为辅的多孔体系，经消石灰改性后的油污泥热解残渣与沥青之间存在较强的物理吸附作用与化学吸附作用，提高了油污泥热解残渣与沥青之间的黏结力；消石灰掺量占填料总质量的30%时，其对油污泥热解残渣沥青胶浆的改性效果最佳；当粉胶比为1.0,消石灰掺量为30%时，与普通矿粉沥青胶浆相比，其水煮后的质量损失率减小了18.2%;-6℃、-12℃、-18℃时的蠕变劲度分别降低18.3%、16.5%、5.4%;64℃、70℃、76℃、82℃时的抗车辙因子分别降低6.9%、7.4%、3.3%、1.4%。...

Stability of Asphalt Mortar from Pyrolysis Residue of Oil Sludge Modified with Hydrated Lime Based on Rheological Properties

The effect of hydrated lime on the performance of asphalt mortar from oil sludge pyrolysis residue and its action mechanism were investigated to evaluate the modified asphalt mortar properties and its application in road engineering. The physicochemical properties of the oil sludge pyrolysis residue were analyzed using scanning electron microscopy and infrared spectroscopy. Based on three indexes of asphalt mortar and viscosity tests, the mix ratio of asphalt mortar obtained from the pyrolysis residue of oil sludge modified with slaking lime was analyzed. Through dynamic shear rheometer and bending beam rheometer tests, the water stability and high- and low-temperature rheological properties of the modified asphalt mortar were evaluated. Finally, the microstructure interface characteristics and modification mechanism of the modified asphalt mortar were analyzed using microscopic tests. The results show that the pyrolysis residue of oil sludge has a porous system with large and small pores as the main pores. Significant physical and chemical adsorption exists between the pyrolysis residue of oil sludge modified with slaked lime and the asphalt, which improves the adhesion between the pyrolysis residue of oil sludge and the asphalt. When the slaked lime content is 30% of the total mass of the filler, the asphalt mortar exhibits the best modification effect. When the powder-to-binder ratio is 1.0, and the lime content is 30%, the mass-loss rate after boiling decreases by 18.2% compared with that of ordinary asphalt mortar. The creep stiffness values at -6℃, -12℃, and -18℃ decrease by 18.3%, 16.5%, and 5.4%, respectively. The rutting resistance factor values at 64℃, 70℃, 76℃, and 82℃ decrease by 6.9%, 7.4%, 3.3%, and 1.4%, respectively. Therefore, slaked lime can improve the water stability and low-temperature rheological properties of asphalt mortar obtained from oil sludge pyrolysis residue. The research results provide theoretical and technical support for effective resource utilization of oil sludge pyrolysis residues.