کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
256170 503543 2016 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Ultrasonic scattering measurement of air void size distribution in hardened concrete samples
ترجمه فارسی عنوان
اندازه گیری پراکندگی التراسونیک از توزیع حجمی هوا در نمونه های بتنی سخت شده
کلمات کلیدی
توزیع حجم هوا، محتویات هوا تجزیه و تحلیل معکوس، تکنیک های پراکندگی التراسونیک، بتن سخت
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی عمران و سازه
چکیده انگلیسی


• Favorably compare ultrasonic scattering measurement with ASTM C457 test results.
• Apply combined log-normal and normal distributions for improved measurement accuracy.
• Describe small-size and large-size air void distributions of air-entrained concrete.
• Ultrasonic air void measurement can help to evaluate freeze-thaw durability.

The size distribution of air voids in concrete has significant impacts on freeze-thaw damage. This study presented a non-destructive ultrasonic scattering technique to determine the air void size distribution in hardened concrete samples. The ultrasonic scattering theory was applied to calculate the theoretical attenuation of concrete by including the effects of the viscoelastic matrix and different sizes of air voids and aggregates. The air void size distribution was determined by using an inverse analysis to minimize the difference between theoretical and experimental attenuation of concrete. The logarithm normal distribution for large-size air voids and normal distribution for small-size air voids were selected to better represent the air void size distribution in concrete. Both the large-size range and small-size air void distributions were obtained with ultrasonic scattering techniques for hardened concrete specimens. These results were favorably compared with the petrography-based ASTM C 457 method. The comparisons indicated that the developed ultrasonic scattering technique can measure the size distribution of air voids in concrete for the evaluation of freeze-thaw durability.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Construction and Building Materials - Volume 113, 15 June 2016, Pages 415–422
نویسندگان
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