Ultra-high performance concrete (UHPC) shows high strength, high ductility under tensile loading, and high durability. Self-compacting ability is one of the most important merit of UHPC, but high fluidity paradoxically limits concrete pavement application for slope casting. This paper investigates the behaviour of fresh UHPC at rest and proposes a rheological criterion for UHPC to be cast on an inclined slab. Computational fluid dynamics analysis is adopted and, consequently, a criterion ensuring zero-flow state of UHPC is determined together with the boundary effect of formwork. An in-situ criterion in terms of the slump flow is also proposed by applying the empirical formula relating the slump flow to the yield stress. Mock-up slope casting verifies the proposed criterion with three UHPC mixes showing slump flow of 500–700 mm. The results of this study could be used as a basic criterion for application of UHPC to inclined-surface pavement.

超高性能混凝土（UHPC）在拉伸载荷下表现出高强度、高延展性和高耐久性。自密实能力是 UHPC 最重要的优点之一，但高流动性矛盾地限制了混凝土路面在斜坡浇筑中的应用。本文研究了新鲜 UHPC 在静止时的行为，并提出了 UHPC 浇铸在倾斜板上的流变标准。采用计算流体动力学分析，从而确定了确保UHPC零流动状态的标准以及模板的边界效应。通过应用将坍落度流动与屈服应力联系起来的经验公式，还提出了关于坍落度流动的现场判据。模拟斜坡铸造验证了建议的标准，三种 UHPC 混合物显示坍落度为 500-700 毫米。