Main performance indices of linear SBS791.

An inexpensive and high-performing solid Coumarone resin was added to Styrene-butadiene-styrene (SBS) copolymer-modified asphalt to enhance its storage stability and road performance. To assess the effect of Coumarone resin dosage on the SBS-modified asphalt, a series of laboratory tests were conducted. The composite modified asphalt’s segregation test was used to evaluate its storage stability, Dynamic Shear Rheometer (DSR) and Multiple Stress Creep Recovery (MSCR) tests were employed to investigate its high-temperature performance and permanent deformation resistance, and the Bending Beam Rheology (BBR) test was utilized to measure its low-temperature performance. Fluorescence microscopy was used to observe the composite modified asphalt’s microstructure, and Fourier Transform Infrared Spectroscopy (FTIR) was conducted to study the changes in chemical structure during the modification process. The results showed that Coumarone resin can improve the compatibility of SBS and asphalt, improve the high-temperature performance and deformation resistance of SBS-modified asphalt, and adding an appropriate amount of Coumarone resin can help enhance the low-temperature cracking resistance of modified asphalt. The optimal dosage of Coumarone resin recommended for SBS-modified asphalt performance enhancement is 2% under the test conditions, as determined by comparing the test results of samples with various dosages.

将一种低成本高性能的固体香豆酮树脂（Coumarone resin）添加至苯乙烯-丁二烯-苯乙烯（Styrene-butadiene-styrene，SBS）改性沥青中，以提升其储存稳定性与路用性能。为探究香豆酮树脂掺量对SBS改性沥青的改性效果，本研究开展了一系列室内试验。采用离析试验评价该复合改性沥青的储存稳定性，通过动态剪切流变仪（DSR）与多应力蠕变恢复（MSCR）试验分别考察其高温性能与抗永久变形能力，利用弯曲梁流变（BBR）试验测定其低温性能。采用荧光显微镜观察复合改性沥青的微观结构，并通过傅里叶变换红外光谱（FTIR）分析改性过程中的化学结构变化。试验结果表明，香豆酮树脂可改善SBS与沥青的相容性，提升SBS改性沥青的高温性能与抗变形能力；掺入适量香豆酮树脂还有助于增强改性沥青的低温抗裂性能。通过对比不同掺量试样的试验结果，本研究推荐在本次试验条件下，用于优化SBS改性沥青性能的香豆酮树脂最佳掺量为2%。