具有碱-硅反应性的现场混凝土的水分条件

"SP-126: Durability of Concrete: Second International Conference, Montreal, Canada 1991" Pub Date : 1991-08-01 DOI:10.14359/2467

D. Stark

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引用次数: 58

摘要

利用相对湿度(RH)测量，研究了现场混凝土表现出碱-二氧化硅反应性的水分状况。先前的测定是在实验室砂浆样品上进行的，以确定维持膨胀反应性所需的阈值水平。结果表明，在21℃至24℃范围内，相对湿度大于80%才能支持膨胀的碱-硅反应性。现场测量显示，沙漠地区高速公路和水坝中的大部分混凝土都足够潮湿，可以维持膨胀的ASR。

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The Moisture Condition of Field Concrete Exhibiting Alkali-Silica Reactivity

The moisture condition of field concretes exhibiting evidence of alkali-silica reactivity was investigated utilizing relative humidity (RH) measurements. Prior determinations were made on laboratory mortar specimens to determine the threshold level required to sustain expansive reactivity. Results indicated that RH values greater than 80 percent, referenced to 21 degrees to 24 degrees Centigrade, are required to support expansive alkali-silica reactivity. Field measurements revealed that most of the concrete in highways and dams in desert areas are sufficiently damp to sustain expansive ASR.

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"SP-126: Durability of Concrete: Second International Conference, Montreal, Canada 1991"

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