Author/Authors :
Zhang, Ji Northwest Normal University - Institute of Polymers - College of Chemistry and Chemical Engineering,College of Life Science, China , Wang, Junlong Northwest Normal University - Institute of Polymers - College of Chemistry and Chemical Engineering,College of Life Science, China , wu, Yiqian Northwest Normal University - Institute of Polymers - College of Chemistry and Chemical Engineering,College of Life Science, China , Sun, Wenxiu Northwest Normal University - Institute of Polymers - College of Chemistry and Chemical Engineering,College of Life Science, China , Wang, Yunpu Northwest Normal University - Institute of Polymers - College of Chemistry and Chemical Engineering,College of Life Science, China
Abstract :
One problem of polymer modified bitumens (PMBs) concerns the poor compatibility between polymer and bitumens. Natural bitumen (NB) is often used for bitumen modification in order to obtain improved performance of the respective bitumen mixtures. This paper presents the results of NB modified bitumens with improved properties, prepared by incorporating styrene butadiene rubber (SBR). The effects of SBR and SBRlNB on the conventional, rheological, thermal, and morphological properties of the modified bitumens were studied. It was found that 2% content of NB shows marked improvement in high temperature properties by increasing the softening point in SBRlNB modified bitumen, while SBR of 3% content in SBRlNB modified bitumens shows significant effect on the low temperature properties and the aging resistance. The morphology in accordance with TG-DTG and DSC analysis indicated that compatibility and thermal properties were improved with a homogeneous and stable mix structure in modified bitumens. FTIR analysis shows few new weak peaks for modified bitumens indicating that physical alteration is the main change in the modified bitumens.
Keywords :
natural bitumen , SBR , modified bitumen , rheological properties , DSC , TGA , DTGA ,
