Pavement performance analysis of asphalts modified by different types of tourmalines
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摘要: 选取2种电气石粉和4种电气石负离子粉, 采用熔融共混法制备电气石改性沥青, 进行了针入度、软化点和延度性能测试, 研究了电气石类型及掺量对沥青感温性能、高温性能、低温性能与粘附性等路用性能的影响规律。采用改进弯曲流变试验研究了电气石对沥青低温性能的影响效果, 采用水煮法对电气石改性沥青与集料的粘附性能进行评价, 借助扫描电镜试验、差示扫描热试验、压电性试验和热电性试验分析了电气石对沥青路用性能的改善机理。试验结果表明: 电气石粉改性沥青感温性能随掺量增加先改善后变差, 电气石负离子粉改性沥青感温性能呈现相反的变化规律; 各电气石改性沥青高温性能随掺量增加均不断提高; 电气石粉目数越大, 对沥青路用性能改善效果越好; 电气石负离子粉改性沥青的路用性能随负离子释放量的增大而不断降低; 在相同目数条件下, 电气石负离子粉对沥青性能的改善效果优于电气石粉; 电气石能有效改善沥青的低温性能, 而且能够均匀稳定地分散在沥青中, 与沥青形成稳定整体; 电气石加入到沥青后其电性能仍能正常发挥。可见, 电气石能够显著改善沥青的路用性能。Abstract: Two kinds of tourmaline powders and four kinds of tourmaline anion powders were selected to modify asphalt, and the tourmaline modified asphalt was prepared by using a melting-blending method. The penetration, softening point and ductility were tested, and the effect laws of tourmaline types and mixing amount on asphalt temperature sensitivity, high-temperature and low-temperature properties, adhesion property were studied. The effect of tourmaline on asphalt low-temperature property was studied by using improved bending beam rheometer(BBR) test, and the adhesion property between tourmaline modified asphalt and aggregate was evaluated by using water-boiling method. The improved mechanism of tourmaline on asphalt pavement performance was analyzed by using scanning electron microscope(SEM) test, differential scanning calorimetry(DSC) test, piezoelectric test and thermoelectric test. Analysis result shows that the temperature sensitivity of tourmaline powder modified asphalt improves firstly and then reduces with the increase of mixing amount, and that of tourmaline anion powder modified asphalt shows an opposite law. The high-temperature performances of all tourmaline modified asphalts improve with the increase of mixing amount. The pavement performance of tourmaline powder modified asphalt improves significantly with the increase of tourmaline powder mesh, that of tourmaline anion powder modified asphalt reduces unceasingly with the increase of anion release amount.In the same mesh, the effect of tourmaline anion powder on asphalt pavement performance is better than that of tourmaline powder. Tourmaline can well improve the low-temperature property of tourmaline modified asphalt. Tourmaline can disperse in asphalt uniformly and stably, and can form a stable whole. The electric property of tourmaline can be played fully when tourmaline is added into asphalt.So tourmaline can improve the road performance of asphalt significantly.
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Key words:
- road material /
- tourmaline modified asphalt /
- pavement performance /
- SEM test /
- DSC test
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图 1 不同类型电气石粉改性沥青的PI值
Figure 1. PI values of asphalts modified by different types of tourmaline powders
图 2 不同类型电气石负离子粉改性沥青的PI值
Figure 2. PI values of asphalts modified by different types of tourmaline anion powders
图 3 电气石粉与负离子粉325目改性沥青的PI值
Figure 3. PI values of asphalts modified by tourmaline powder and tourmaline anion powder 325meshes
图 4 电气石粉改性沥青的软化点
Figure 4. Softening points of asphalts modified by tourmaline powders
图 5 电气石负离子粉改性沥青的软化点
Figure 5. Softening points of asphalts modified by tourmaline anion powders
图 6 电气石粉与负离子粉325目改性沥青的软化点
Figure 6. Softening points of asphalts modified by tourmaline power and tourmaline anion powder 325meshes
图 8 不同类型电气石改性沥青DSC图谱
Figure 8. DSC images of different types of tourmaline modified asphalts
表 4 压电性能与热电性能试验结果
Table 4. Test results of piezoelectric properties and thermoelectric properties
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