The durability of concrete structures is crucial for their sustainable use; therefore, this study aims to provide a method for their service life prediction. The first stage of the study presents an in-situ air permeability measurement approach to evaluate the carbonation resistance of steam-cured concrete. The changes in properties of steam-cured concrete, including moisture content, air permeability, and carbonation depth of precast concrete elements were first highlighted by discussing normal-cured concretes, produced with different water-to-binder ratios and curing periods. The validity of the proposed approach was then verified by combining the coefficient of air permeability, kT, (using a Torrent tester) and carbonation rate. The results indicate that kT is a good index for predicting carbonation resistance of steam-cured concrete. In the second stage, an application of the kT index for predicting the service life of steam-cured concrete is demonstrated on mock-up box culvert elements produced in a precast concrete plant.

混凝土结构的耐久性对于其可持续利用至关重要。因此，本研究旨在为他们的使用寿命预测提供一种方法。研究的第一阶段提出了一种现场透气性测量方法，以评估蒸汽固化混凝土的抗碳化性。首先通过讨论以不同的水灰比和不同的养护时间生产的普通养护混凝土，来突出蒸汽养护混凝土的性能变化，包括含水量，透气性和预制混凝土构件的碳化深度。然后通过结合透气系数kT（使用Torrent测试仪）和碳化速率来验证所提出方法的有效性。结果表明，kT是预测蒸汽养护混凝土抗碳化性的良好指标。