A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Study on the classical and rheological properties of castor oil-polyurethane pre polymer (C-PU) modified asphalt
Highlights C-PU modifier was prepared by chemical synthesis. C-PU can be uniformly dispersed in the matrix asphalt and enhance both the high and low temperature properties. Complex modulus increased and phase angle descent obviously with the increase of C-PU. 30wt% is the optimal additive content.
Abstract The castor oil-polyurethane pre polymer (C-PU) terminated with NCO group was synthesized by renewable castor oil and liquefied MDI as asphalt modifier and C-PU modified asphalt with 10–40wt% C-PU were prepared. Classical and rheological properties were investigated. The results showed that, softening point and ductility of C-PU modified asphalt were both increased, while penetration was decreased to some extent. With the increase of C-PU, the modulus increases and the phase angle decreases which showed an improved resistance to deformation. Among them, 30wt% is the best dosage. Moreover, Brookfield viscosity of the modified asphalt varies little at 130°C with the time prolonged and a fairly homogeneous dispersion system was observed by microscope, which indicated that the thermal stability of modified asphalt at 130°C was good. FTIR analysis showed that C-PU with NCO terminated could react with water and active hydrogen in asphalt and air. The transition from the simple physical blending with asphalt to slowly chemical modification process could explain the improvement of the asphalt performance.
Study on the classical and rheological properties of castor oil-polyurethane pre polymer (C-PU) modified asphalt
Highlights C-PU modifier was prepared by chemical synthesis. C-PU can be uniformly dispersed in the matrix asphalt and enhance both the high and low temperature properties. Complex modulus increased and phase angle descent obviously with the increase of C-PU. 30wt% is the optimal additive content.
Abstract The castor oil-polyurethane pre polymer (C-PU) terminated with NCO group was synthesized by renewable castor oil and liquefied MDI as asphalt modifier and C-PU modified asphalt with 10–40wt% C-PU were prepared. Classical and rheological properties were investigated. The results showed that, softening point and ductility of C-PU modified asphalt were both increased, while penetration was decreased to some extent. With the increase of C-PU, the modulus increases and the phase angle decreases which showed an improved resistance to deformation. Among them, 30wt% is the best dosage. Moreover, Brookfield viscosity of the modified asphalt varies little at 130°C with the time prolonged and a fairly homogeneous dispersion system was observed by microscope, which indicated that the thermal stability of modified asphalt at 130°C was good. FTIR analysis showed that C-PU with NCO terminated could react with water and active hydrogen in asphalt and air. The transition from the simple physical blending with asphalt to slowly chemical modification process could explain the improvement of the asphalt performance.
Study on the classical and rheological properties of castor oil-polyurethane pre polymer (C-PU) modified asphalt
Xia, Lei (author) / Cao, Dongwei (author) / Zhang, Haiyan (author) / Guo, Yansheng (author)
Construction and Building Materials ; 112 ; 949-955
2016-02-25
7 pages
Article (Journal)
Electronic Resource
English
| British Library Online Contents | 2016
| British Library Online Contents | 2016
| British Library Online Contents | 2016