轻度解交联橡胶粉干法改性SMA13性能研究

Study on performance of SMA13 modified by low-degree decrosslinking crumb rubber based on dry process method

通过沥青混合料车辙试验、小梁弯曲试验、冻融劈裂及浸水马歇尔试验,研究了不同掺量轻度解交联橡胶粉(LDCR)对干法改性SMA13高温性能、低温性能与水稳定性的影响。结果表明,掺入LDCR提高了SMA13的高温性能,尤其当掺量≥2%时,混合料的动稳定度超过4.5%SBS改性SMA13(对照组);2%掺量的LDCR干法改性SMA13低温抗裂性最优;总体上LDCR干法改性SMA13的水稳定性低于对照组。综合考虑,LDCR的最佳掺量为2%,与对照组相比,可降低材料成本约5%。

The high-temperature performance,low-temperature performance,and water stability of dry process modified SMA13 with varying dosages of low-degree Decrosslinked Crumb Rubber(LDCR)were assessed through several indoor tests,including the rutting test,the low-temperature bending tests,the freeze-thaw splitting test and the immersion Marshall test.These tests compare the modified SMA13 with a 4.5%SBS-modified SMA13(the reference group).The findings indicate that incorporation of LDCR markedly enhances the high-temperature properties of SMA13,particularly when the LDCR content is 2%or higher,at which point the dynamic stability value of the mixture surpasses that of the reference group.At low temperatures,the SMA13 modified with a 2%dosage of LDCR demonstrates superior crack resistance.In general,water stability of LDCR-modified SMA13 is below that of the reference group.Comprehensive considering,a 2%dosage of LDCR is recommended for optimal modification of SMA13,potentially reducing material costs by approximately 5%.