Abstract
Dioctyl phthalate (DOP) was introduced into asphalt-based sealant as a plasticizer in this work. Four kinds of sealants with different DOP content were prepared, and thermal stability and low-temperature performance of five samples with asphalt as a control group were evaluated by fluidity test, softening point test, thermogravimetric-differential thermal analysis (TG-DTA), low-temperature tensile test, and differential scanning calorimeter (DSC), respectively. Furthermore, the mechanism of DOP on sealant properties was analyzed by Fourier transform infrared spectroscopy (FTIR) and fluorescence microscope. Results show that DOP can significantly improve the low-temperature performance of sealant, but slightly deteriorate the high-temperature performance. This is because DOP can supplement the light component of sealant and enhance the fluidity of the internal components. On the one hand, DOP reduces the apparent activation energy of sealant and lowers the barrier to chemical reactions, indicating that DOP is slightly detrimental to the thermal stability of sealant. On the other hand, DOP greatly reduces the glass transition temperature of sealant and improves its low-temperature performance. However, there is no evident chemical reaction between DOP and sealant, and physical effects play a major role in the effects of DOP on sealant properties. In addition, DOP can promote the expansion and cross-linking of the polymer in the sealant and ultimately enhance the compatibility between asphalt and polymer molecules. In short, DOP is recommended as a plasticizer to prepare asphalt sealants with excellent properties.
Highlights
Defects such as cracks, ruts, potholes, and subsidence are prone to occur during the period of pavement service
Addition, no other characteristic peaks were found. erefore, it is further proved that there is no evident chemical reaction between Dioctyl phthalate (DOP) and asphalt molecules, and the plasticizing effect of DOP mainly comes from physical effects
Effects of DOP content on the thermal stability and low-temperature performance of asphalt sealants were investigated. ermal stability was evaluated by flow, softening point and thermogravimetric-differential thermal analysis (TG-DTA) results, and low-temperature performance was reflected by low-temperature tensile length and glass transition temperature
Summary
Ruts, potholes, and subsidence are prone to occur during the period of pavement service. Many researchers have improved the performance of the high-temperature sealant by adding different modifiers to the original asphalt. Fan et al [18] compared the effects of plasticizers on the mechanical properties of sealant suitable for permeable pavement. Cheng et al [21] added DOP to the modified asphalt to improve the low-temperature performance degradation caused by the incorporation of linear low-density polyethylene (LLDPE). Asphalt sealant containing multiple polymers was prepared with asphalt, SBS, rubber powder, rubber oil, LLDPE, and stabilizers as raw materials, and effects of DOP content on the performances of sealant were studied. E research results of this work are of positive significance for revealing the mechanism of DOP on the performance of sealant and preparing asphalt sealants with excellent properties Asphalt sealant containing multiple polymers was prepared with asphalt, SBS, rubber powder, rubber oil, LLDPE, and stabilizers as raw materials, and effects of DOP content on the performances of sealant were studied. e research results of this work are of positive significance for revealing the mechanism of DOP on the performance of sealant and preparing asphalt sealants with excellent properties
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
