GTM-based Experimental Study on the Asphalt Mixtures Design
CHAI Jinling1,2, LI Wei2,3,4
1 Henan Vocational and Technical College of Communications, Zhengzhou 451400, China 2 State Engineering Laboratory of Highway Maintenance Technology, Changsha University of Science & Technology, Changsha 410114, China 3 Henan Transportation Research Institute Co.,Ltd, Zhengzhou 450006, China 4 Henan Future Transportation Technologies Co.,Ltd, Zhengzhou 450000, China
Abstract: In ordert to study the asphalt mixture GTM (Gyratory testing machine) mixture ratio design method in the road engineering practicability effectively, through comparison and analysis of volumetric property with GTM design and Marshall design. Finally, the pavement performance of on grouted composite materials was validated. The results show that: The limit equilibrium methods adopted in GTM design methods, the optimum proportion can be determined by stability factor GIS and shear safety factor GSF. Compared with the Marshall mix design, the optimum proportion has declined markedly, volume relative density and VFA asphalt saturation index increased, voids of mineral aggregate and ratio of void have generally on the low side; Marshall design method control is not considered to fit for asphalt mixture. Under the optimum conditions. Just as a reference index volume compressibility parameters, the road performance requires corresponding verification. The performance of GTM design asphalt mixture is better than the Marshall mix design. High temperature stable performance and low temperature freeze resistance loss ability were improved significantly. Low temperature anti-cracking performance advantage is not obvious. With the increase of temperature, the higher-temperature deformation resistance of asphalt mixture was more, high temperature has a lower sensitivity. In the case of AC-16 test data, Asphalt content was reduced by 6.1%, volume relative density increased by 1.9%, VV fell by 37.6%,VMA reduced by 18.5% and stability increased by 27%. Among them, 60 ℃ dynamic stability increased by 26.9%,65 ℃ dynamic stability increased by 99.2%, low temperature bending failure strain increased by 4.7%, and the residual stability increased by 4.9%, freeze-thaw splitting strength ratio increased by 8.7%.
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2020, Vol. 34 
