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Preparation and Properties of Flame Retarded SBS Modified Asphalt

Author: LuoXiaoFeng
Tutor: YuJianYing
School: Wuhan University of Technology
Course: Materials Processing Engineering
Keywords: Flame retardant Modified asphalt Synergistic effect Limiting oxygen index Rheology
CLC: U414
Type: Master's thesis
Year: 2006
Downloads: 417
Quote: 9
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Abstract


Asphalt pavement has become the mainstream of the road type of road construction at home and abroad, because of its low noise and ride comfort, slip resistance, ease of maintenance, but there are also flammable disadvantage due to asphalt, highway tunnels are still mainly using cement pavement . Therefore, improving the flame retardancy of asphalt, to make it suitable for the construction of highway tunnel road materials sector at home and abroad has become an important research topic. SBS modified asphalt base material, respectively, using different types of flame retardants, prepared a series of fire-retardant modified asphalt to evaluate its flame retardancy, the oxygen index method Determination of the limiting oxygen index (LOI) of the flame retardant asphalt , the type of flame retardant effect of improving the flame-retardant properties of the modified asphalt. The results showed that the flame-retardant effect of the single flame retardants modified asphalt is not obvious, composite flame retardants due to the synergistic effect can significantly improve the flame resistance of the modified asphalt best ratio DBDPO: ZB: Sb 2 O 3 3:1:1, the optimum amount of flame retardants to 8%, the LOI of up to 26.0. DSC-TGA results show retardant SBS modified asphalt accelerating decomposition temperature, the thermal degradation temperature and start the combustion temperature than the modified asphalt obvious improvement, start weight loss temperature decreases, indicating that the combustion significantly inhibited. The test results show that the flame retardant physical properties of SBS modified asphalt, after flame-retardant processing, the softening point and viscosity of the modified asphalt has increased, a slight decrease in the degree of extension, the heat storage stability is improved and the temperature reduced sensitivity. Fluorescence photomicrograph showed that the flame retardant treatment SBS particle diameter becomes smaller, the better the dispersibility of the flame retardant modified bitumen SBS. Dynamic shear rheometer (DSR), rotational viscometer rheological properties show that the phase angle of the flame retardant SBS modified asphalt is reduced and the platform area longer, low temperature viscous improve, enhance high-temperature flexibility, rutting factor increases with better resistance to rutting deformation. Rotating thin film oven aging the test (RTFOT) and fluorescent UV aging test (QUV) trials evaluating the aging properties of the flame retardant SBS modified asphalt. The results showed: RTFOT LOI larger, improved flame resistance, RTFOT before and after the fire-retardant modified asphalt softening point of difference and the difference is smaller than the variation of the modified asphalt ductility; greatly reduced the impact of temperature on the tan delta, making the flame retardant modified asphalt system temperature increase flexibility, rutting factor is a substantial increase in temperature sensitivity decreased, indicating that the thermal aging abilities have improved. With fluorescent UV aging time, LOI and the softening point increase slightly increased rutting factor, 45 days and 60 days after aging retardant modified asphalt performance difference is small.

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CLC: > Transportation > Road transport > Road works > Road construction materials
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