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A case study of evaluating joint performance in relation with subsurface permeability in cold weather region

机译：评估寒冷地区联合性能与地下渗透率的案例研究

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Water that stays in a pavement system increases the risk of distress due to mechanisms such as freezing and thawing and erosion. This can be avoided by providing permeable subsurface layers to drain excess water from the pavement system. A borehole permeameter developed at Iowa State University was used in this research to measure the permeability of subsurface layers of an existing pavement with a view to investigating causes of joint distress. This research aims to increase understanding of the relationship between concrete pavement performance and the permeability of subsurface layers. Field borehole permeameter test results on a city street indicate that low permeable subsurface layer may contribute to joint deterioration under freezing condition. Laboratory falling head permeability tests on a similar base material under a frozen condition show that permeability of the samples decreases as moisture content increases, and freezing of the moist base material significantly reduces permeability.
机译：由于冻结，解冻和侵蚀等机理，滞留在路面系统中的水会增加遇险的风险。通过提供可渗透的地下层以从路面系统中排出多余的水，可以避免这种情况。在爱荷华州立大学开发的钻孔渗透仪被用于这项研究中以测量现有路面的地下层的渗透率，以调查造成关节窘迫的原因。这项研究旨在加深对混凝土路面性能与地下层渗透性之间关系的理解。在城市街道上进行的现场钻孔渗透率测试结果表明，在冻结条件下，低渗透性地下层可能会导致接头劣化。在冷冻条件下对类似基材的实验室落头渗透性测试表明，样品的渗透性会随着水分含量的增加而降低，而潮湿基础材料的冷冻会显着降低渗透性。

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