改性沥青中SBS含量电化学检测法抗干扰指标

Anti-interference index of electrochemical detection technology for SBS content of modified asphalt

为了辨别SBS改性沥青中是否掺加SBS类似物或沥青类似物,排除其对改性沥青中SBS含量电化学检测方法的干扰。以橡胶粉、糠醛抽出油和芳烃油为干扰剂加入改性沥青中,模拟不良沥青生产商为降低SBS掺量而使用其生产改性沥青的情况。对不同SBS掺量的改性沥青标准样品进行SBS含量电化学分析试验,建立标准样品滴定体积与SBS掺量标准曲线。同时,对不同SBS掺量的改性沥青标准样品分别进行针入度、延度、软化点、弹性恢复和135℃运动黏度试验,拟合出各技术指标与SBS掺量标准曲线。然后,对不同干扰剂掺量的改性沥青分别进行SBS含量电化学检测和上述性能试验,并建立相应的关系曲线。将掺干扰剂的改性沥青试验关系曲线与改性沥青标准样品试验标准曲线进行对比分析,得到能够识别改性沥青中是否添加上述干扰剂的指标,并对提出的改性沥青中SBS含量电化学检测方法的抗干扰指标进行了可靠性分析。结果表明:延度可用于识别改性沥青中是否掺加了橡胶粉,延度和软化点2个指标可用于识别改性沥青中是否添加了糠醛抽出油和芳烃油,且延度和软化点与SBS含量的相关系数均达0.937以上,通过了显著性检验。

In order to identify whether SBS modified asphalt was mixed with SBS analogs or asphalt analogs,and eliminate the interference of that in the modified asphalt to SBS content electrochemical detection technology.Rubber powder,furfural extract oil,and aromatic oil were added to modified asphalt to simulate the production of modified asphalt with them,in order to reduce the SBS content.Electrochemical tests for the SBS content of the modified asphalt standard sample with different SBS contents were carried out,and the standard curve of the titrationvolume to the SBS content of the standard sample was established.At the same time,the penetration,ductility,softening point,elastic recovery,and 135 ℃ kinematic viscosity of the modified asphalt samples with different SBS contents were tested,the curves of the technical indexes to the standard SBS content were fitted.Then,the modified asphalt samples with different contents of interferences agents were tested by electrochemical detection of the SBS content and the above mentioned performance tests,and the corresponding relationship curves were established.By comparing and analyzing the relation curves obtained from the tests on the modified asphalt samples,with the interference agents and the standard curves obtained from the tests on the modified asphalt standard samples,the indexes that can identify whether or not interference agents were added to modified asphalt could be obtained.The reliability of the proposed index of the electrochemical detection technology for the SBS content of modified asphalt was studied.The results show that ductility can be used to identify whether rubber powder is added to modified asphalt,and the ductility and softening point can be used to identify whether furfural extract oil and aromatic oil are added to modified asphalt.The correlation coefficients of ductility and softening point with SBS content are all above 0.937,which has passed the significance test.6 tabs,14 figs,21 refs.