沥青热稳定性与燃烧特性的量化评价

Quantitative evaluation on thermal stability and combustion properties of asphalt

采用恒温加热试验、氧指数试验和锥形量热试验,对比分析了基质沥青和橡胶沥青的质量损失、氧指数、热释放速率(HRR)、总释放热(THR)和质量损失速率(MLR),用以精确量化评价沥青的热稳定性和燃烧特性.试验结果表明:橡胶沥青在相同温度下的质量损失、氧指数值、HRR峰值、THR峰值、MLR峰值及其质量损失速率随温度升高而增加的变化值均高于基质沥青;橡胶沥青热稳定性和燃烧特性劣于基质沥青;对比3种试验方案,锥形量热试验评价参数较多,结果更为可靠,建议采用锥形量热法评价沥青热稳定性与燃烧特性.

To quantitatively evaluate the thermal stability and combustion characteristics of asphalt,the tests of constant temperature heating,oxygen index and cone calorimetry were used to obtain mass loss,oxygen index,heat release rate(HRR),total heat release rate(THR)and mass loss rate(MLR)of two asphalts of base asphalt and rubber asphalt.The results show that at the identical temperature,the mass loss,oxygen index,peaks of HRR,THR and MLR of rubber asphalt and the value of mass loss rate increased with the increasing of temperature are higher than those of base asphalt,while the thermal stability and combustion characteristics of rubber asphalt are inferior to base asphalt.Comparing three tests,the cone calorimetry test results are more reliable because of its more parameters,which is recommended to evaluate thermal stability and combustion characteristics of asphalt.