Quantitative assessment of the oxidation potential of sulfide-bearing aggregates in concrete using an oxygen consumption test
Quantitative assessment of the oxidation potential of sulfide-bearing aggregates in concrete using an oxygen consumption test
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DOI：
10.1016/j.cemconcomp.2016.01.003
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发表时间：
2016-03
影响因子：
10.5
通讯作者：
Andreia Rodrigues;J. Duchesne;B. Fournier
中科院分区：
文献类型：
--
作者：
Andreia Rodrigues;J. Duchesne;B. Fournier
在氧气和湿度的存在下，一些混凝土骨料中存在的硫化铁矿物质会氧化，对混凝土基础设施造成损坏。采用耗氧法测定混凝土骨料的氧化电位。将压实的骨料层暴露于密封单元中的氧气（O2）中，并监测O2消耗。优化的参数包括10 cm的颗粒尺寸<150 μm的聚集体材料的压实层，保持在40%的饱和度，在池的顶部留有10 cm的顶部空间。在22 °C下，在3小时的测试期内监测顶空中存在的O2的消耗。该测试是能够区分八个硫化物轴承和控制聚集体选择时，使用的阈值限制为5%的O2消耗。然而，这一限值草案将需要通过对大量集料进行测试来确认。
In the presence of oxygen and humidity, the iron sulfide minerals present in some concrete aggregates can oxidize creating damage to concrete infrastructure. An oxygen consumption test was developed to assess the oxidation potential of concrete aggregate. A compacted layer of aggregate material is exposed to oxygen (O2) in a hermetic cell, and the O2consumption is monitored. Optimized parameters included a 10 cm compacted layer of aggregate material with particle size <150 μm kept at 40% saturation degree with a 10-cm headspace left at the top of the cell. The consumption of the O2present in the headspace is monitored over a 3-h testing period at 22 °C. The test was able to discriminate the eight sulfide-bearing and control aggregates selected when using a threshold limit of 5% O2consumed. This draft limit will, however, require to be confirmed through the testing of a larger number of aggregates.