کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6725934 | 503608 | 2013 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
New perspective of service life prediction of fly ash concrete
ترجمه فارسی عنوان
چشم انداز جدید پیش بینی عمر مفید بتن خاکستر پرواز
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی عمران و سازه
چکیده انگلیسی
Rapid Chloride Migration (RCM) test developed in Sweden in the 90s is widely used to determine the chloride migration coefficient (DRCM) of concrete because of its simplicity and rapidity. In Europe, the time-dependent DRCM has been introduced in the DuraCrete project as input parameter to predict the service life of concrete. In the DuraCrete project, when determining the DRCM of fly ash concrete, reference time (the maturity age of concrete) is normally set as 28Â days like what used in Portland cement concrete and blast furnace slag (BFS) concrete. However, fly ash does not fully play its role in concrete at 28Â days due to slow Pozzolanic reaction of fly ash. Therefore, 28Â days is not a realistic reference time for predicting service life of fly ash concrete. This study is aimed at determining a reasonable reference time (t0) for fly ash concrete. The DRCM of fly ash concrete is determined by the RCM test for a long-term period of curing up to 2Â years. The influences of fly ash dosage and w/b ratio on the DRCM of fly ash concrete were considered. The results show that the DRCM of fly ash concrete significantly decreases after 28Â days of curing. The reference time, t0 for fly ash concrete is proposed according to the concrete maturity indicated by the content of calcium hydroxide (CH) in cement paste blended with fly ash. This proposed reference time is applied to predict the service life of fly ash concrete and predict the long-term chloride migration coefficient of fly ash concrete under laboratory condition.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Construction and Building Materials - Volume 48, November 2013, Pages 764-771
Journal: Construction and Building Materials - Volume 48, November 2013, Pages 764-771
نویسندگان
Zhuqing Yu, Guang Ye,