基于体积法的水泥稳定级配碎石配合比设计方法

Mix Design Method of Cement Stabilized Grade Crushed Stone Based on Volume Method

为了有效控制水泥稳定级配碎石的结构组成和内部材料分布,并使其具备更好的路用性能,利用体积法对间断级配水泥稳定碎石进行配合比设计,并提出控制指标。以粗骨料的间隙率为评价指标判断混合料是否为骨架嵌挤结构;以混合料的空隙率为评价指标控制混合料的密实度,确保所设计的混合料为骨架密实结构。通过试验,将利用此方法设计的混合料与利用传统级配设计方法设计的混合料在力学性能和干缩性能方面进行了对比,结果表明利用此方法设计的混合料具备更高的抗压强度和更好的干缩性能。此外,由于该方法通过具体试验确定混合料级配,因此能够兼顾不同石料的堆积特性、集料形状、表面纹理等物理性质,更加有针对性、灵活性。

In order to control the structure composition and inner material distribution of cement stabilized grade crushed stone and provide its better pavement performance, the mix proportion of gap gradation cement stabilized crushed stone was designed by using the volume design method, and the control index was put forward. To ensure the framework dense structure of the designed mixture, the voids of coarse aggregate was taken as the evaluation index of embedded skeleton structure, the voids of mixture was taken as the evaluation index of density of mixture. The parameters of mixtures designed by the presented method and the traditional method such as mechanical property and drying shrinkage were tested. The results show that （ 1 ） the mixture designed by the presented method has better compressive strength and dry shrinkage; （2） as the gradation of the mixture was determined by test, the presented method is more appropriate and flexible and it could consider the accumulation characteristics, aggregate shape and surface texture of different materials.