Durability characteristics of high-performance concrete (HPC) and ultra-high performance concrete (UHPC) are evaluated in comparison to normal strength concrete (NSC). HPC and UHPC are cast using commonly available materials with no special heat treatment. Concrete resistivity, rapid chloride permeability, sorptivity, porosity, and resistance to chloride migration and carbonation of these three types of concrete are assessed. Microstructure and hydration products are investigated using scanning electron microscope (SEM) imaging and X-ray diffraction (XRD) analyses, respectively. Potential enhancement in the service life of reinforced concrete (RC) structures when concrete is replaced with HPC and UHPC is predicted using the time-to-corrosion model. Dense microstructures, high electrical resistance, negligible chloride permeability, low sorptivity, no carbonation ingress are observed in HPC and UHPC. The chloride diffusion coefficient was found to be at least three orders of magnitude lower in UHPC compared to NSC, which could delay the corrosion initiation of steel reinforcement. With such positive attributes, these concretes are expected to find more widespread application in concrete structures in harsh-climatic conditions. This paper provides additional data and analysis that could accelerate the adoption of these materials in practice.

与标准强度混凝土（NSC）相比，评估了高性能混凝土（HPC）和超高性能混凝土（UHPC）的耐久性能。HPC和UHPC使用通用材料铸造，无需特殊热处理。评估了这三种类型混凝土的混凝土电阻率，快速的氯离子渗透性，吸水性，孔隙率以及对氯离子迁移和碳化的抵抗力。分别使用扫描电子显微镜（SEM）成像和X射线衍射（XRD）分析研究了微结构和水合产物。使用腐蚀时间模型预测了用HPC和UHPC代替混凝土时钢筋混凝土（RC）结构使用寿命的潜在增长。致密的微观结构，高电阻，可忽略的氯离子渗透率，低吸着性，在HPC和UHPC中未观察到碳化进入。与NSC相比，UHPC中的氯化物扩散系数至少降低了三个数量级，这可能会延迟钢筋的腐蚀开始。具有这些积极特性，这些混凝土有望在恶劣气候条件下在混凝土结构中找到更广泛的应用。本文提供了其他数据和分析，可以加速在实践中采用这些材料。这些混凝土有望在恶劣气候条件下在混凝土结构中找到更广泛的应用。本文提供了其他数据和分析，可以加速在实践中采用这些材料。这些混凝土有望在恶劣气候条件下在混凝土结构中找到更广泛的应用。本文提供了其他数据和分析，可以加速在实践中采用这些材料。