Influence of filler–bitumen ratio on performance o

Authors: Hongsheng Qiu Ximing Tan Shu Shi Heng Zhang

Publish Date: 2013/06/20

Volume: 21, Issue: 1, Pages: 40-46

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Abstract

When the filler–bitumen ratio of asphalt mortar changes its adhesion and viscoelasticity will also change as well as its mechanical performances such as fatigue durability at normal temperature and lowtemperature ductility Thus the filler–bitumen ratio directly affects the asphalt mortar’s performance This paper tested the physical indexes of the No 70 matrix asphalt mortar modified by additive Sasobit SB and Sasowam SW through dynamic shear rheometer and bending beam rheometer under different temperature conditions and comprehensively analyzed the hightemperature antirutting and fatigue performance lowtemperature crack resistance performance and ductility of asphalt mortar The results show that ore powder not only can increase the antirutting factor but also can increase the aging resistance of asphalt SB has better performances than SW at high temperatures As for the filler–bitumen ratio of asphalt mortar with additive SB the recommended value is between 08 and 12 and the value may be a little larger for that with SWAsphalt is often the choice of highway pavement material in the world With the traffic growth the overloaded vehicles will cause the early damage of asphalt pavement including hightemperature rutting lowtemperature cracks subsidence potholes etc Mortar theory assumes that asphalt mixture is a dispersed system of multilevel interspace reticulate structure with coarse aggregate as the dispersed phase and asphalt mortar is the first decentralized system of asphalt mixture with fine aggregate as the dispersed phase scattered in the asphalt medium 1 The structure composition and performance of asphalt mortar have direct influence on the road performance of the asphalt pavement A lot of research about asphalt mortar 2 3 4 5 6 has been done in terms of the standard Marshall test immersion Marshall test rutting test and lowtemperature bending test of beam specimens Zhang et al 7 studied the asphalt mortar property with SHRP equipment dynamic shear rheometer DSR and bend beam rheometer BBR tested and analyzed the effect of filler–bitumen ratio on performance of mortar at high and low temperatures in 2004 and they recommended that the filler–bitumen ratio should not exceed 14 for hightemperature performance and not exceed 10 for lowtemperature performance But they did not give the minimum value of filler–bitumen ratio and did not consider additive in asphalt It has been concluded that modified asphalt by additive can significantly improve the asphalt pavement performance 8 9 10 It is still important to explore a proper filler–bitumen ratio to control the asphalt performanceIn this paper we conducted tests on asphalt mortar with additive SB Sasobit and SW Sasowam through DSR and BBR By analyzing test data the hightemperature antirutting and lowtemperature crack resistance performance and the fatigue durability of asphalt mortar are explored Finally a filler–bitumen ratio of asphalt mortar is recommended

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