| The semi-rigid asphalt pavement is widely used in our country,but some diseases caused by poor quality of interlayer are one of the key problems and technical difficulties in highway construction at present.Thinking about the deficiencies of the traditional technologies in interlayers treatment,in this thesis,non-smooth surface treatment technologies of interlayers are put forward.With interlayer treatment technologies of semi-rigid asphalt pavement as research object,the contrast tests between the non-smooth surface treatment technologies and conventional treatment technologies were carried out,which would provide the basis for the application of the non-smooth surface treatment technologies in semi-rigid asphalt pavement.In this thesis,the common diseases and destruction mechanism of interlayers are first explained.Facing at the shortcomings of treatment technologies,several treatment technologies,such as preheating treatment,hydraulic treatment and distributing pits treatment,are put forward.With the interface strength as evaluation indexes,the contrast tests between the non-smooth surface treatment technologies and conventional treatment technologies were completed by the shear strength tests and tensile strength tests.The feasibility of preheating treatment technology was also explored.The experimental results show that the interface strength of the fine milling technology is greater than that of the untreated base when priming oil is sprayed.Under the condition of priming oil sprayed,compared with fine milling of traditional technologies,the maximum shear stress of preheating treatment technology(preheated to 60℃)decreases by 5.20%,and the maximum tension stress increases by 5.04%.The maximum shear stress of hydraulic treatment technology increases by 0.93%,and the maximum tension stress increases by 9.18%.Under the condition of 9 pits of diameter 18 mm distributed at equal distance,the maximum shear stress increases by 5.20%,and the maximum tension stress increases by 7.39%.These results verify the feasibility of enhancing the interface strength by preheating treatment technology,hydraulic treatment technology and distributing pits treatment technology,and also prove that the effect of the distributing pits is better.The interface strength increases when the spacing of pits is smaller or the diameter increases.Thus it can be seen that the embedded structure of the distributing pits non-smooth treatment technology has a reinforced effect on the interlayer bonding,which can replace the traditional fine milling technology. |
