基于Palierne模型的TPU改性沥青-煤矸石交互评价研究

Study on Interaction Evaluation Between TPU Modified Asphalt and Coal Gangue Based on Palierne Model

为了评价TPU改性沥青与煤矸石的交互作用能力,揭示其交互作用影响机理,并促进废弃煤矸石在公路工程领域的综合利用,本研究利用动态剪切流变仪(DSR)测试了TPU改性沥青胶浆的流变性能,采用广义sigmoidal函数和WLF方程构建了TPU改性沥青胶浆的动态剪切模量主曲线。利用Palierne模型对TPU改性沥青-煤矸石的交互作用能力进行评价,通过微观及物理化学试验对交互作用能力的影响机理进行了分析。结果表明:煤矸石与TPU改性沥青的交互作用能力优于石灰岩和花岗岩;TPU改性沥青与煤矸石混合后并未产生新的产物,两者之间主要发生物理吸附作用;矿粉的孔外比表面积是影响交互作用能力的关键指标,煤矸石的开口孔隙更容易与沥青紧密嵌锁,可提升其对TPU改性沥青的吸附能力,从而使煤矸石与TPU改性沥青具有更强的交互作用能力。

In order to evaluate the interaction ability between TPU modified asphalt and coal gangue,reveal its influence mechanism,and promote the comprehensive utilization of waste coal gangue in highway engineering,the DSR tests were conducted to obtain the rheological properties of TPU modified asphalt mastic.Master curves of dynamic shear modulus of asphalt mastic were constructed by generalized sigmoidal function and WLF equation.The interaction ability between TPU modified asphalt and coal gangue was evaluated by using the Palierne model.The influence mechanism of interaction ability was analyzed through microscopic and physical-chemical tests.The results show that the interaction ability between coal gangue and TPU modified asphalt is better than that of limestone and granite.There is no new substance formed after mixing of coal gangue and TPU modified asphalt.Physical adsorption is the major interaction between them.The specific surface area outside the pore of mineral filler is the key indicator affecting the interaction ability.The open pores of coal gangue are easier to be closely interlocked with asphalt,which can improve its adsorption ability to TPU modified asphalt,so as to make coal gangue powder have stronger interaction ability with TPU modified asphalt.