基于响应曲面法的封层材料组成优化

Optimization of Seal Material Composition Based on Response Surface Method

为了提高面层层间的黏结性能,采用纤维封层替代黏层行使功能,而封层的不同材料组成使得其黏结性能发生变化。为得到层间黏结强度最佳情况下的封层材料组成,进行了路面封层材料组成的优化试验。首先针对影响纤维封层黏结性能的3个主要影响因素:沥青用量、纤维用量和纤维长度,采用单因素试验研究了3个因素对封层剪切强度的影响规律。然后基于单因素试验得到的3因素变化规律,利用正交试验法与响应曲面法开展了优化封层材料组成的试验研究。结果表明:在单因素试验条件下,层间的剪切强度随着沥青用量、纤维用量和纤维长度的增大,呈先增后减的趋势,采用正交试验法和响应曲面法得到的最优封层材料组成的剪切强度分别为1.33 MPa和1.53 MPa;通过响应曲面法改良后得到的最佳纤维封层材料组成中,沥青用量、纤维用量、纤维长度分别为1.845 kg/m^(2),97 g/m^(2)和5.7 cm;为了对响应曲面法得到结果进行对比验证,经剪切强度预测值与优化方案的剪切强度实测值比较,两者误差不超过5%。以剪切强度为响应值对比分析了3种试验方法的优化效果,分别为:响应曲面法>单因素试验法>正交试验法。响应曲面法得出的最优解优于正交试验和单因素试验的最优解,明确了响应曲面法可以实现封层材料的组成优化,提高封层剪切强度。

In order to improve the bonding performance between surface layers, fiber sealing layer is used to replace the adhesive layer to perform the function, and the different material compositions of the sealing layer changes the bonding performance. In order to obtain the composition of the sealing material under the best condition of interlayer bonding strength, the optimization test of the material composition of pavement sealing layer is carried out. First, in view of the 3 main influencing factors of the bonding performance of fiber sealing layer(asphalt dosage, fiber dosage and fiber length), the influence of the 3 factors on the shear strength of the sealing layer is studied by single-factor experiment. Then, based on the 3-factor change rule obtained by single-factor test, the composition of sealing material is optimized by using the orthogonal test method and response curved surface method. The result shows that(1) under the single-factor test condition, the interlaminar shear strength increases first and then decreases with the increase of asphalt dosage, fiber dosage and fiber length, and the shear strengtsh of the optimal sealing material obtained by orthogonal test method and response curved surface method is 1.33 MPa and 1.53 MPa respectively;(2) among the optimal fiber sealing material compositions obtained by the response surface method, the asphalt dosage, fiber dosage and fiber length are 1.845 kg/m^(2), 97 g/m^(2) and 5.7 cm respectively;(3) in order to compare and verify the result obtained by the response curved method, the error of the shear strength prediction value and the measured shear intensity of the optimization scheme is compared, the error of the 2 does not exceed 5%;(3) the optimization effects of the 3 test methods are compared and analyzed using shear strength as the response value, which are: response surface method>single-factor test method>orthogonal test method. The optimal solution obtained by the response surface method is better than those of the orthogonal test and the single-factor test, it is clear that the response surface method can optimize the composition of the sealing material and improve the shear strength of the sealing layer.