为了全面提高废口罩纤维(Waste Mask Fiber, WMF)改性沥青的高低温性能,将其与SBR改性剂共同制备WMF-SBR复合改性沥青,基于MSCR流变性能试验,对未老化、FTROT短期老化和PAV长期老化三种状态下的复合改性沥青,测试分析其蠕变恢复率R、不...为了全面提高废口罩纤维(Waste Mask Fiber, WMF)改性沥青的高低温性能,将其与SBR改性剂共同制备WMF-SBR复合改性沥青,基于MSCR流变性能试验,对未老化、FTROT短期老化和PAV长期老化三种状态下的复合改性沥青,测试分析其蠕变恢复率R、不可恢复蠕变柔量Jnr、应力敏感性Jnrdiff、Rdiff等指标的变化规律。结果表明,其软化点较基质沥青提高了14.6%,较WMF改性沥青降低了5%,延度较WMF改性沥青增加了380%;在0.1 kPa、3.2 kPa应力作用下,WMF-SBR复合改性沥青的R值、Rdiff值、Jnr值、Jnrdiff值随老化程度的增加分别呈增大、减小、减小、减小的趋势变化;与基质沥青、SBR改性沥青相比,WMF-SBR复合改性沥青在相同老化阶段和应力水平条件下,R、Rdiff指标均最大,Jnr、Jnrdiff指标均最小。WMF-SBR复合改性沥青显著提高了WMF改性沥青的低温塑性;相比SBR改性沥青,其高温抗车辙变形稳定性更好,弹性变形恢复能力更强,应力敏感性更小,老化后性能更稳定、更耐久。In order to comprehensively improve the high and low temperature performance of waste mask fiber (Waste Mask Fiber, WMF) modified asphalt, the WMF-SBR composite modified asphalt was prepared with SBR modifying agent. Based on the MSCR rheological performance test, the changes in creep recovery rate R, unrecoverable creep compliance Jnr, stress sensitivity Jnrdiff, and Rdiff of composite modified asphalt under three states of unaged, FTROT short-term aging, and PAV long-term aging were tested and analyzed. The results show that, its softening point is 14.6% higher than the matrix asphalt, is 5% lower than the WMF modified bitumen. The extension is 380% higher than that of WMF modified asphalt;under the action of the 0.1 kPa, 3.2 kPa stress, the R value, Rdiff value, Jnr value and Jnrdiff value of WMF-SBR composite modified asphalt respectively increase, decrease, decrease and decrease with the increase of aging degree;compared with matrix asphalt and SBR modified bitumen, WMF-SBR composite modified bitumen under the same aging stage and stress level conditions, the indicators (R, Rdiff) are the largest and the indicators (Jnr, Jnrdiff) are the minimum. WMF-SBR composite modified asphalt significantly improves the low temperature plasticity of WMF modified asphalt;compared with SBR modified asphalt, it has better high temperature rut deformation stability, more resilient elastic deformation recovery, less stress sensitivity, and more stable and durable performance after aging.展开更多
本研究利用70号道路石油沥青和SBS改性沥青,将温拌剂(Sasobit)、氢氧化铝(ATH)和有机蒙脱土(OMMT)与沥青复配,制备成三种不同阻燃剂掺量(质量分数)的温拌阻燃沥青,采用多应力蠕变恢复(MSCR)试验开展对温拌阻燃沥青高温性能的评价。分别...本研究利用70号道路石油沥青和SBS改性沥青,将温拌剂(Sasobit)、氢氧化铝(ATH)和有机蒙脱土(OMMT)与沥青复配,制备成三种不同阻燃剂掺量(质量分数)的温拌阻燃沥青,采用多应力蠕变恢复(MSCR)试验开展对温拌阻燃沥青高温性能的评价。分别对温拌阻燃沥青在60℃下的应变变化、蠕变恢复率(R)、不可恢复蠕变柔量(J_(nr))及其相应应力敏感性指标(R_(diff)、J_(nrdiff))进行分析,并依据AASHTO M 332-20标准对不同阻燃剂掺量的温拌阻燃沥青进行交通分级。结果表明:随着阻燃剂掺量的提高,两种类型沥青的应变值减小,J_(nr)值呈减小趋势,R值呈增大趋势;阻燃剂掺量较低时,提高其掺量对沥青结合料的高温性能改善效果更加明显;温拌阻燃沥青(道路石油沥青)的J_(nr3.2)值不满足AASHTO标准中“≤4.5”的要求。温拌阻燃沥青的J_(nrdiff)值均能满足AASHTO标准中“≤75%”的要求。温拌阻燃沥青(道路石油沥青)未达到标准交通要求而无法分级,温拌阻燃沥青(SBS改性沥青)在4%阻燃剂掺量下达到特重交通的标准,在8%、12%掺量下达到极重交通的标准,因此温拌阻燃沥青(SBS改性沥青)的高温性能更好。基于对温拌阻燃沥青蠕变力学指标、高温交通分级和经济性的综合考虑,推荐复配阻燃剂(ATH、OMMT的质量比为3∶1)的最佳掺量为8%。展开更多
文摘为了全面提高废口罩纤维(Waste Mask Fiber, WMF)改性沥青的高低温性能,将其与SBR改性剂共同制备WMF-SBR复合改性沥青,基于MSCR流变性能试验,对未老化、FTROT短期老化和PAV长期老化三种状态下的复合改性沥青,测试分析其蠕变恢复率R、不可恢复蠕变柔量Jnr、应力敏感性Jnrdiff、Rdiff等指标的变化规律。结果表明,其软化点较基质沥青提高了14.6%,较WMF改性沥青降低了5%,延度较WMF改性沥青增加了380%;在0.1 kPa、3.2 kPa应力作用下,WMF-SBR复合改性沥青的R值、Rdiff值、Jnr值、Jnrdiff值随老化程度的增加分别呈增大、减小、减小、减小的趋势变化;与基质沥青、SBR改性沥青相比,WMF-SBR复合改性沥青在相同老化阶段和应力水平条件下,R、Rdiff指标均最大,Jnr、Jnrdiff指标均最小。WMF-SBR复合改性沥青显著提高了WMF改性沥青的低温塑性;相比SBR改性沥青,其高温抗车辙变形稳定性更好,弹性变形恢复能力更强,应力敏感性更小,老化后性能更稳定、更耐久。In order to comprehensively improve the high and low temperature performance of waste mask fiber (Waste Mask Fiber, WMF) modified asphalt, the WMF-SBR composite modified asphalt was prepared with SBR modifying agent. Based on the MSCR rheological performance test, the changes in creep recovery rate R, unrecoverable creep compliance Jnr, stress sensitivity Jnrdiff, and Rdiff of composite modified asphalt under three states of unaged, FTROT short-term aging, and PAV long-term aging were tested and analyzed. The results show that, its softening point is 14.6% higher than the matrix asphalt, is 5% lower than the WMF modified bitumen. The extension is 380% higher than that of WMF modified asphalt;under the action of the 0.1 kPa, 3.2 kPa stress, the R value, Rdiff value, Jnr value and Jnrdiff value of WMF-SBR composite modified asphalt respectively increase, decrease, decrease and decrease with the increase of aging degree;compared with matrix asphalt and SBR modified bitumen, WMF-SBR composite modified bitumen under the same aging stage and stress level conditions, the indicators (R, Rdiff) are the largest and the indicators (Jnr, Jnrdiff) are the minimum. WMF-SBR composite modified asphalt significantly improves the low temperature plasticity of WMF modified asphalt;compared with SBR modified asphalt, it has better high temperature rut deformation stability, more resilient elastic deformation recovery, less stress sensitivity, and more stable and durable performance after aging.
文摘本研究利用70号道路石油沥青和SBS改性沥青,将温拌剂(Sasobit)、氢氧化铝(ATH)和有机蒙脱土(OMMT)与沥青复配,制备成三种不同阻燃剂掺量(质量分数)的温拌阻燃沥青,采用多应力蠕变恢复(MSCR)试验开展对温拌阻燃沥青高温性能的评价。分别对温拌阻燃沥青在60℃下的应变变化、蠕变恢复率(R)、不可恢复蠕变柔量(J_(nr))及其相应应力敏感性指标(R_(diff)、J_(nrdiff))进行分析,并依据AASHTO M 332-20标准对不同阻燃剂掺量的温拌阻燃沥青进行交通分级。结果表明:随着阻燃剂掺量的提高,两种类型沥青的应变值减小,J_(nr)值呈减小趋势,R值呈增大趋势;阻燃剂掺量较低时,提高其掺量对沥青结合料的高温性能改善效果更加明显;温拌阻燃沥青(道路石油沥青)的J_(nr3.2)值不满足AASHTO标准中“≤4.5”的要求。温拌阻燃沥青的J_(nrdiff)值均能满足AASHTO标准中“≤75%”的要求。温拌阻燃沥青(道路石油沥青)未达到标准交通要求而无法分级,温拌阻燃沥青(SBS改性沥青)在4%阻燃剂掺量下达到特重交通的标准,在8%、12%掺量下达到极重交通的标准,因此温拌阻燃沥青(SBS改性沥青)的高温性能更好。基于对温拌阻燃沥青蠕变力学指标、高温交通分级和经济性的综合考虑,推荐复配阻燃剂(ATH、OMMT的质量比为3∶1)的最佳掺量为8%。
