溫度－濕度迴圈對混凝土結構和性能的影響

The Influences of Temperature-Humidity Cycles on the Structure and Performance of Concrete

李海飛(Hai-Fei Li) ； 水中和(Zhong-He Shui) ； 孫濤(Tao Sun)

《工程科技與教育學刊》 7卷2期 (2010/04) Pp. 349-353

https://doi.org/10.6451/JETE.201004.0349

摘要

混凝土試件在溫度爲0-60℃和相對濕度爲30-50%的迴圈變化環境中養護後，進行了力學性能試驗和顯微硬度、XRD、SEM測試。與標準養護條件下獲得的混凝土材料相比，經溫－濕迴圈的混凝土早期強度略高，但3d之後強度開始低於標準養護混凝土的強度，且兩者差距逐漸加大。微觀結構分析表明，低相對濕度且溫－濕交替環境下的混凝土水化程度較低，介面過渡區厚度較寬，影響了混凝土的宏觀性能。

關鍵字

溫－濕迴圈 ； 力學性能 ； 水化產物 ； 顯微硬度

並列摘要

Concrete specimens were cured in the cycling surroundings of 0-60℃ of temperature and 30-50% of RH. The mechanical properties, microhardness, XRD and SEM were tested on the concrete. Compared to samples that cured in standard condition, the early strength of the specimens cured with cycling temperature-humidity surroundings was slightly higher, but it became lower than the latter 3 days after. Moreover, the difference was gradually increased with time. The results of XRD and SEM show that a low relative humidity and fluctuant temperature-humidity surrounding can cause a low degree of hydration, the wider ITZ thickness, and affect the mechanical properties of concrete.

並列關鍵字

temperature-humidity cycle ； mechanical property ； hydration product ； microhardness