کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1457896 | 989286 | 2006 | 9 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Pessimum effect of externally applied chlorides on expansion due to delayed ettringite formation: Proposed mechanism Pessimum effect of externally applied chlorides on expansion due to delayed ettringite formation: Proposed mechanism](/preview/png/1457896.png)
Mortars and concretes were subjected to a heat treatment cycle consisting of a pre-set period of 4 h at 23 °C followed by accelerated curing at 95 °C prior to storage at room temperature in water or limewater, 0.5 M, 2.8 M sodium chloride solutions. It was found that the specimens stored in 0.5 M sodium chloride solution gave a much greater expansion than those stored in limewater or 2.8 M sodium chloride solution. This pessimum influence of chlorides on expansion due to delayed ettringite formation deviates from the commonly held view that chlorides mitigate sulphate attack in concretes. The mechanism of the pessimum effect of chlorides on expansion due to delayed ettringite formation, and the final products of the associated phase transformations have been proposed. X-ray diffraction and differential thermal analysis techniques were used to follow phase transformations.
Journal: Cement and Concrete Research - Volume 36, Issue 4, April 2006, Pages 688–696