This paper addresses the challenge of evaluating the air permeability of structural concrete in situ, using non-destructive techniques. Specifically, it aims to reconcile air permeability measurements made in the field with those made in the laboratory. Permeability measurements in the laboratory and in the field use both under pressure and in vacuum techniques in steady or unsteady states. Differences between the methods may arise from pressure or flow regime variations, or flow direction control. The study proposes a methodology for evaluating air permeability in the field using an existing vacuum technique and an original numerical inverse analysis. An experimental programme using different protocols of permeability measurement with vacuum techniques analysed by numerical modelling is used to understand the differences observed experimentally.

中文翻译：

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实验室和现场混凝土渗透率测量的数值分析

本文解决了使用无损技术现场评估结构混凝土透气性的挑战。具体来说，它的目的是协调现场进行的透气性测量与实验室进行的透气性测量。实验室和现场的渗透率测量在稳定或不稳定状态下使用压力和真空技术。方法之间的差异可能源于压力或流态变化或流向控制。该研究提出了一种使用现有真空技术和原始数值反分析来评估现场透气性的方法。使用通过数值模拟分析的真空技术的不同渗透率测量协议的实验程序来了解实验观察到的差异。