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为研究沥青路面在车辆荷载作用下的层间黏结特性,采用自主研发的能施加水平推力的切-拉拔装置进行层间黏结试验。通过正交试验,测试了不同温度、水平推力和黏层油用量等条件下沥青混合料复合试件的层间黏结强度,分析了各因素对黏结强度的影响规律,并通过敏感性分析确定了各因素的影响程度;采用多元非线性回归方法和SPSS统计软件,分析了层间黏结强度与温度、水平推力和黏层油用量的关系,构建了低温、常温、高温3种温度下沥青路面在切-拉拔力综合作用下的层间黏结模型,并验证了该模型的可行性。研究结果表明:水平推力削弱了层间黏结整体性能,层间黏结强度降低,当黏层油用量为0.8kg/m2时,水平推力由0 MPa增至0.2 MPa,其黏结强度降至原有的1/3;随着水平推力的增加,层间黏结强度随黏层油用量的增加呈先增后减趋势,但影响程度逐渐减弱,最大黏结强度所对应的合理黏层油用量为0.8~1.0kg/m2;随着温度的升高,层间黏结强度迅速降低,温度越高,水平推力对层间黏结强度的影响幅度越大,当温度为50℃、水平推力为0.2MPa时,层间黏结强度降为0MPa;不同温度区间层间黏结强度下降趋势不同,低温最快、常温变缓、高温最慢;各因素对层间黏结强度影响大小的顺序为温度、水平推力、黏层油用量。
In order to study the interlayer bonding behavior of asphalt pavement under vehicle loading, a self-developed cutting-drawing device capable of applying horizontal thrust was used to carry out interlayer adhesion test. The orthogonal test was used to test the interlaminar bond strength of asphalt mixture samples under different conditions of temperature, horizontal thrust and viscous oil dosage. The influence of various factors on the bond strength was analyzed and the sensitivity analysis was conducted to determine The relationship between the interlaminar bond strength and the temperature, the horizontal thrust force and the amount of the viscous layer oil was analyzed by multivariate non-linear regression and SPSS statistical software, and the relationship between the asphalt pavement and the asphalt pavement under the conditions of low temperature, normal temperature and high temperature Cut-pull force under the combined effect of the interlayer adhesion model, and verify the feasibility of the model. The results show that the horizontal thrust weakens the overall performance of interlayer bonding, and the bond strength between layers decreases. When the amount of viscous layer oil is 0.8kg / m2, the horizontal thrust increases from 0 MPa to 0.2 MPa, and the bond strength decreases to the original 1/3; with the increase of horizontal thrust, the interlaminar bond strength first increases and then decreases with the increase of the amount of viscous layer oil, but the degree of influence gradually weakened, and the maximum amount of viscous oil corresponding to the maximum bond strength is 0.8 to 1.0 kg / m2. As the temperature increases, the inter-layer bond strength decreases rapidly. The higher the temperature, the greater the influence of horizontal force on the inter-layer bond strength. When the temperature is 50 ℃ and the horizontal thrust is 0.2MPa, The bond strength is reduced to 0MPa; the bond strength between layers in different temperature trends downward trend, the lowest temperature is the fastest, normal temperature slows down, the slowest temperature; the order of the influence of various factors on the interlayer adhesion strength is the temperature, the level of thrust, .