基于响应曲面法确定玄武岩纤维热再生沥青混合料最佳配合比

Determination of the Optimal Mix Proportions for Basalt Fiber Recycled Asphalt Mixtures Using Response Surface Methodology

在进行沥青混合料配合比设计时,由于掺加两种或两种以上掺合物时,采用马歇尔试验法或正交试验法进行沥青混合料配合比存在不足,为了确定沥青混合料最佳配合比,通过基于响应曲面法中的BBD(Box-Behnken design)法对级配类型AC-13掺加玄武岩纤维、RAP的热再生沥青混合料进行级配优化设计。结果表明,计算优化得出最佳油石比为5.17%、旧料掺量RAP为31.89%及玄武岩纤维掺量0.26%。并通过试验对预测模型进行验证,预测值与实测值模型之间相对误差较小(小于3%),可见BBD法建立的二阶模型具有较好的拟合效果,对再生沥青混合料各掺量配合比设计能进行有效优化,并且最佳各掺量下的玄武岩纤维热再生沥青混合料具有良好的路用性能。

In the design of asphalt mixture proportions,when two or more additives are added,the use of Marshall test or orthogonal test method may have limitations.In order to determine the optimal asphalt mixture proportion,a Box-Behnken(BBD)design based on response surface methodology was employed to optimize the gradation of AC-13 type asphalt mixture with the addition of basalt fiber and RAP for hot recycled asphalt mixture.The results indicated that the optimized oil-stone ratio is 5.17%,the reclaimed asphalt pavement(RAP)content is 31.89%,and the basalt fiber content is 0.26%.Experimental validation of the predictive model shows a small relative error(less than 3%)between predicted and measured values,demonstrating that the second-order model established by the BBD method has a good fitting effect.This optimization approach can effectively optimize the mixture proportions of recycled asphalt mixture with basalt fiber and achieve good performance for the hot recycled asphalt mixture under the optimal additive contents.