基于响应曲面法水泥稳定碎石混合料配合比设计研究

Research on Mix Design of Cement Stabilized MacadamMixture Based on Response Surface Methodology

选定含水率、水泥剂量,以及4.75 mm通过率作为自变量,以振动成型试件的7 d无侧限抗压强度作为响应变量,借助响应曲面模型进行试验设计,通过不断调节各自变量水平,结合不同条件下三维曲面图和二维等高线图的变化规律,探索不同自变量的最优取值范围.结果表明:各因素对水泥稳定碎石性能的影响程度由大到小依次为:4.75 mm通过率>水泥剂量>含水率.4.75 mm通过率与水泥剂量的交互作用以及水泥剂量与含水率的交互作用都对水稳材料抗压强度都有显著影响,但含水率与4.75 mm通过率的交互作用对其抗压强度的影响不显著.各原材料的最佳取值范围:含水率为4.5%~4.8%;水泥剂量4.5%~5.5%;4.75 mm通过率为30%~40%.

The water content,cement dosage and pass rate of 4.75 mm were selected as independent variables,and the 7-day unconfined compressive strength of vibration molded specimens was taken as response variables.The experimental design was carried out with the help of response surface model.By constantly adjusting the level of their respective variables,combined with the changing rules of three-dimensional surface map and two-dimensional contour map under different conditions,the optimal range of different independent variables was explored.The results show that the influence degree of each factor on the performance of cement stabilized macadam is:4.75 mm pass rate>cement dosage>water content.The interaction between the passing rate of 4.75 mm and the cement dosage and the interaction between the cement dosage and the water content have significant effects on the compressive strength of water-stabilized materials,but the interaction between the water content and the passing rate of 4.75 mm has no significant effect on its compressive strength.The optimum range of raw materials:water content is 4.5%~4.8%,cement dosage is 4.5%~5.5%and the pass rate of 4.75 mm is 30%~40%.