Investigation of the High-Temperature and Rheological Properties for Asphalt Sealant Modified by SBS and Rubber Crumb

Abstract

Crack sealing is an important measure for pavement maintenance. Hot-poured crack sealant is the most utilized material for crack sealing. However, its poor high-temperature and rheological properties seriously weaken the mechanical properties of repaired pavement. Thus, to overcome the disadvantage of the poor high-temperature and rheological properties of sealant, styrene–butadiene–styrene (SBS) and rubber crumb (CR) were utilized for modifying the asphalt-based sealants. Softening point tests, temperature tests, frequency scan tests, and multiple stress creep recovery tests (MSCR) were conducted to evaluate the high-temperature and rheological properties of the modified sealant. Additionally, the influence of SBS and CR on the high-temperature performance of the modified sealant was quantitatively analyzed by the grey relational analysis method. The results reveal that the SBS has a greater enhancement effect on the high-temperature performance of sealant than CR. Increasing the SBS and CR content in the sealant could enhance the sealant’s high-temperature performance, stiffness, and elasticity. Compared with asphalt-based sealant and one-component modified asphalt-based sealant, SBS/CR-modified asphalt sealant has greater viscosity and higher temperature deformation resistance. Additionally, SBS can increase the stress level of the sealant, thereby enhancing the resistance of the sealant to permanent deformation.

A Review of Rubberised Asphalt for Flexible Pavement Applications: Production, Content, Performance, Motivations and Future Directions

“…The temperature sweep test also showed that the asphalt binders modified with SBS and CR had higher flexibility at high temperatures. When considering the shear modulus and phase angle of asphalt binders, the viscoelastic balance of the 20% CR and 5% SBS-modified asphalt binder was more suitable for dealing with cracking issues [80]. The higher Superpave values for rutting resistance and complex modulus in the frequency sweeps produced better rheological performance with higher CR contents.…”

A Study on the Performance of Asphalt Modified by Desulfurized Waste Rubber/Ethylene Vinyl Acetate Composite with Additives

“…A study also showed that waste tire rubber powder (WTR) exists in a granular state in asphalt, which is not conducive to the compatibility of the two, resulting in stress concentration. At present, using WTR composite with other asphalt modifiers is the mainstream way to prepare a modified asphalt with better performance, including common modified materials such as SBS, PE, EVA, and so on [6][7][8][9]. Although composite-modified asphalt prepared using WTR and SBS has excellent performance at high and low temperatures, there are some problems, the most important of which is the presence of rubber molecular chains and the difference in physicochemical properties with asphalt, resulting in high viscosity in the modified asphalt, processing difficulties, high temperature degradation, poor storage stability, hydrogen sulfide gas release processing [3,4], and mixture mixing difficulties [2,5].…”

Study on Thermal Stability and Fatigue Properties of SBS/CNT-Modified Asphalt Sealant

“…During road use, cracks are affected by factors such as temperature, precipitation, and loading. Cracks can develop into frost swelling and mineral spalling during stretching, destroying the structural integrity and service life of roads [1][2][3][4]. Therefore, the timely repair of cracks is very significant.…”