کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4918676 1428781 2016 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Evaluation of freeze-thaw damage on concrete material and prestressed concrete specimens
ترجمه فارسی عنوان
ارزیابی آسیب یخ زدگی بر روی مواد بتنی و نمونه های بتنی پیش رونده
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی عمران و سازه
چکیده انگلیسی
The pore structure of the hardened concrete and the microscopic changes of a few selected pores throughout the freeze-thaw test were investigated by a method combining RapidAir and digital metalloscope. Traditional tests were also performed to evaluate the macroscopic change caused by freeze-thaw cycles (FTCs). The investigation shows that the concrete material, of which the spacing factor is 0.405 mm and the air content is 2.38%, can still withstand more than 300 FTCs. Severe microscopic damages occurred after approximately 200 FTCs and the freeze-thaw damage were gradually aggravated afterwards. Prestress forces have a remarkable impact on the failure pattern under FTCs. It was further found that the compressive strength as an indicator is more reliable than the relative dynamic modulus of elasticity in evaluating the freeze-thaw damage on concrete material. In addition, the test and analysis show that the measured prestress losses of bonded specimen are larger than that of unbounded specimen under the attack of FTCs due to the duct grouting effect. The ultimate freeze-thaw prestress loss is about 5% of σcon for both the bonded and unbonded specimens because the grouting cement paste will eventually be completely destroyed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Construction and Building Materials - Volume 125, 30 October 2016, Pages 892-904
نویسندگان
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