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首页> 外文会议>Structural Materials Technology III: An NDT Conference >Nondestructive test methods for evaluating durability of concrete highway structures: experience of Ontario Ministry of Transportation
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Nondestructive test methods for evaluating durability of concrete highway structures: experience of Ontario Ministry of Transportation

机译：评估混凝土公路结构耐久性的无损测试方法：安大略省交通运输部的经验

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Abstract: There is an urgent need for fast, reliable, non-destructive test methods to measure permeability and resistivity of concrete in the field, in order to assess the performance of concrete structures and confirm the benefits of the use of new materials. The application of high performance concrete for rehabilitation of corrosion-damaged highway structures and for new bridge construction has increased in Ontario over the past few years. High performance concrete, containing supplementary cementing materials such as silica fume, typically has lower permeability and higher electrical resistivity than conventional concrete. Since 1993, the R&D staff of the Ontario Ministry of Transportation (MTO) has been evaluating various non-destructive in-situ techniques to measure the permeability and resistivity of concrete. This paper describes two methods used by MTO to measure the permeability of concrete: surface water absorption and air permeability techniques; and presents the methods used to measure the concrete electrical resistivity, chloride movement in the concrete, and corrosion activity of the embedded steel. Many of the tests were performed on both the conventional and high performance concrete. Some of these techniques can be potentially used as quality assurance tools for assessing the quality, performance and durability of concrete in the field. !9
机译：摘要：迫切需要一种快速，可靠，无损的测试方法来测量现场的混凝土渗透率和电阻率，以评估混凝土结构的性能并确认使用新材料的好处。在过去的几年中，安大略省越来越多地将高性能混凝土用于腐蚀损坏的公路结构的修复和新建桥梁的应用。包含辅助胶结材料（例如硅粉）的高性能混凝土通常比常规混凝土具有较低的渗透性和较高的电阻率。自1993年以来，安大略省交通运输部（MTO）的研发人员一直在评估各种无损现场检测技术，以测量混凝土的渗透性和电阻率。本文介绍了MTO用来测量混凝土渗透率的两种方法：地表吸水率和空气渗透率技术；并介绍了用于测量混凝土电阻率，混凝土中氯化物的运动以及埋入钢的腐蚀活性的方法。许多测试都是在常规混凝土和高性能混凝土上进行的。这些技术中的某些可以潜在地用作质量保证工具，以评估现场的混凝土质量，性能和耐久性。 ！9

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