کد مقاله کد نشریه سال انتشار مقاله انگلیسی ترجمه فارسی نسخه تمام متن
6716751 1428745 2018 10 صفحه PDF سفارش دهید دانلود کنید
عنوان انگلیسی مقاله ISI
Numerical service-life modeling of chloride-induced corrosion in recycled-aggregate concrete
ترجمه فارسی عنوان
مدل سازی سرویس عمر عددی از خوردگی ناشی از کلر در بتن بازیافتی
کلمات کلیدی
بتن های جمع آوری شده بازیافت شده، مواد سیمان تکمیلی، پیش بینی خدمات عمر، خوردگی ناشی از کلر، مدل سازی عددی،
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی عمران و سازه
چکیده انگلیسی
This paper presents the theoretical development, validation, and implementation of a 1D numerical service-life prediction model for reinforced recycled aggregate concrete exposed to internal and external sources of chlorides. The model accounts for the inclusion of supplementary cementitious materials (SCMs), namely (a) fly ash, (b) slag, (c) silica fume, and (d) metakaolin, and recycled aggregates (i) with and (ii) without initial chloride contamination from previous in-service exposure. The model is used to predict time to corrosion-induced cracking for reinforced recycled aggregate concrete in five case-study applications, namely structures in a marine splash zone (Zone I), a marine spray zone (Zone II), within 800 km of coastline (Zone III), within 1.5 km of coastline (Zone IV), and parking structures at locations greater than 1.5 km from the coastline (Zone V) in Los Angeles, California and Anchorage, Alaska. The effects of recycled aggregate size, aggregate replacement ratio, degree of aggregate pre-contamination, water-to-cement (w/c) ratio, and SCMs on time-to-cracking of reinforced recycled aggregate concrete are elucidated herein. The potential for SCMs to improve the service life of recycled aggregate concrete is investigated by estimating additions required to meet a target service life of 50 years. Results indicate that, in addition to geographic location, temperature, and severity of exposure, w/c ratio and aggregate replacement ratio exhibit the greatest impact on time to chloride-induced cracking in reinforced recycled aggregate concrete. Furthermore, initial aggregate chloride contamination and aggregate size impart minimal effects on expected service life. Finally, the results illustrate that the use of either fly ash or slag is most viable in achieving a 50-year service life for the recycled aggregate concretes in chloride-laden environments considered in this work.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Construction and Building Materials - Volume 161, 10 February 2018, Pages 236-245
نویسندگان
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