为减少超高性能混凝土（UHPC）的收缩变形并降低养护成本，以多孔烧结铝矾石（CB）骨料作为内养护剂，研发了一种低收缩免蒸养的UHPC。通过室内试验，对自研UHPC的力学和变形性能进行了测试与评估。通过有限元数值模拟，分析了UHPC桥面铺装层的早期温湿度应力演化规律。结果表明，自研UHPC在免蒸养条件下仍然具有超高强度，28 d抗压强度达154 MPa，28 d劈裂抗拉强度达19.3 MPa；含CB骨料UHPC的28 d自收缩变形仅为160 μm/m，可有效降低UHPC铺装层发生翘曲、与下层混凝土发生脱粘的风险；UHPC的耐磨耗和抗冲击性能远优于普通混凝土，可延长桥面铺装层的使用寿命。数值计算结果表明，UHPC铺装层的最大拉应力受铺装层厚度和长度影响不大，因此不需要切缝。为增强UHPC铺装层与基层之间的黏结性能，基层混凝土表面应做粗糙化处理（露石表面），基层与UHPC铺装层之间按设计进行植筋。通过上述研究，验证了采用自研UHPC作为混凝土桥面铺装层的可行性。

To reduce the shrinkage deformation and curing costs of UHPC (Ultra-High Performance Concrete), a low-shrinkage, non-steam-cured UHPC was developed using porous CB (Calcined Bauxite ) aggregate as an internal curing material. Mechanical and deformation properties of the UHPC were tested and evaluated through laboratory experiments. Finite element numerical simulations were employed to analyze the early temperature and humidity stress evolution in the UHPC overlay of a bridge deck pavement. The results indicate that the developed UHPC maintains its ultra-high strength under non-steam curing conditions, with a compressive strength of 154 MPa and a splitting tensile strength of 19.3 MPa at 28 d. The shrinkage deformation of UHPC containing CB aggregate is only 160 μm/m at 28 d, effectively reducing the risk of warping and delamination between the UHPC pavement layer and the underlying concrete. Moreover, UHPC exhibits superior abrasion resistance and impact resistance compared to ordinary concrete, thereby extending the service life of the bridge deck pavement. Numerical calculation results show that the maximum tensile stress in the UHPC overlay is minimally influenced by the thickness and length of the pavement layer, eliminating the need for the installation of expansion joints. To enhance the bond performance between the UHPC overlay and the base course, the surface of the concrete base course should be roughened (exposing aggregate), and reinforing bars should be installed between the base course and the UHPC overlay according to the design. This study validates the feasibility of using self-developed UHPC as a concrete bridge deck overlay.