基于性能的水坝防渗面板沥青混凝土设计方法

Performance-based design-method for asphalt-concrete as seepage prevention face of embankment dams

为全面提高水坝防渗面板沥青混凝土力学性能,提出粗集料间隙率最小值的测定方法和沥青混凝土中粗集料骨架嵌挤的新标准,改进基于性能的粗集料空隙填充法,用于设计一种水坝防渗面板密断级配富沥青混凝土;通过试验评价设计混凝土的稳定度、流值、斜坡流淌值、渗透系数和低温弯拉破坏应变等力学性能,各项力学指标均满足《水工碾压式沥青混凝土施工规范(》DL/T 5363—2006)的要求。结果表明,改进的粗集料空隙填充法是一种基于性能的有效的沥青混凝土组成设计方法,具有广泛的推广和应用价值。

To improve the mechanical properties of asphalt-concrete in embankment dam seepage prevention facing, a method for determination of the minimum value of voids in coarse aggregate and the index of skeleton-interlocking of densegap graded mixture were put forward, in order to improve the coarse aggregate void filling method. A dense-gap-grade full- asphalt-concrete was designed by using the improved method, and its properties were tested through Marshal-test, slop-flow test, permeability-test and small girder bending test at low temperature. These properties satisfied the requirements of the Specifications for Construction of Hydraulic Roller Compacted Bituminous Concrete. The results show that the improved coarse aggregate void filling method is an effective performance-based method for the design of asphalt-concrete.