مقاومت خوردگی بتن مسلح دوگانه فعال شده قلیایی
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مقاومت خوردگی بتن مسلح دوگانه فعال شده قلیایی

عنوان فارسی مقاله: مقاومت خوردگی بتن مسلح دوگانه فعال شده قلیایی بر اساس پوزولان آتشفشانی طبیعی قرار گرفته شده در معرض کلرویدها
عنوان انگلیسی مقاله: Corrosion resistance of alkali-activated binary reinforced concrete based on natural volcanic pozzolan exposed to chlorides
مجله/کنفرانس: مجله مهندسی ساختمان – Journal of Building Engineering
رشته های تحصیلی مرتبط: مهندسی عمران، مهندسی مواد
گرایش های تحصیلی مرتبط: سازه، خوردگی و حفاظت از مواد
کلمات کلیدی فارسی: بتن های فعال شده قلیایی، پوزولان آتشفشانی طبیعی، کلرویدها، خوردگی فلز، پایداری
کلمات کلیدی انگلیسی: Alkali – activated concretes, Natural volcanic pozzolan, Chlorides, Steel corrosion, Durability
نوع نگارش مقاله: مقاله پژوهشی (Research Article)
نمایه: Scopus – Master Journals List – JCR
شناسه دیجیتال (DOI): https://doi.org/10.1016/j.jobe.2020.101593
دانشگاه: Universidad del Valle, Cali, Colombia
ناشر: الزویر - Elsevier
نوع ارائه مقاله: ژورنال
نوع مقاله: ISI
سال انتشار مقاله: 2021
ایمپکت فاکتور: 4.276 در سال 2019
شاخص H_index: 26 در سال 2020
شاخص SJR: 0.901 در سال 2019
شناسه ISSN: 2352-7102
شاخص Quartile (چارک): Q1 در سال 2019
فرمت مقاله انگلیسی: PDF
تعداد صفحات مقاله انگلیسی: 13
وضعیت ترجمه: ترجمه نشده است
قیمت مقاله انگلیسی: رایگان
آیا این مقاله بیس است: خیر
آیا این مقاله مدل مفهومی دارد: ندارد
آیا این مقاله پرسشنامه دارد: ندارد
آیا این مقاله متغیر دارد: ندارد
کد محصول: E15082
رفرنس: دارای رفرنس در داخل متن و انتهای مقاله
فهرست انگلیسی مطالب

Abstract


۱٫ Introduction


۲٫ Significance of the research


۳٫ Materials and experimental procedure


۴٫ Results and discussion


۵٫ Conclusions Declaration of competing interest


Acknowledgements


References

نمونه متن انگلیسی مقاله

Abstract


Alkali-activated concretes are being considered as an alternative environmentally friendly construction materials compared to the ordinary Portland cement. However, although these materials have reported mechanical properties comparable to those of OPC, the corrosion of reinforcing bars is a major durability issue that needs to be studied. This article studies the corrosion performance of an alkali-activated binary reinforced concrete (AABC) based on natural volcanic pozzolan (NP) and ground blast furnace slag (GBFS) exposed to chlorides ions. OPC concrete was used as reference material. To carry out the study, accelerated chloride ingress methods (impressed voltage, wet-dry cycles, and saltwater immersion (3.5% NaCl)) were used. Monitoring of the corrosive process was carried out using the techniques of half-cell potential, linear polarization resistance, polarization curves and curves of current intensity versus time. As complementary techniques, surface electrical resistivity and resistance to chloride ion penetration were evaluated. AABC showed higher resistance to chloride ion penetration compared to OPC concrete, a reduction of the charge passed up to 60% at 360 days of exposition. In general, the various accelerated chloride ingress techniques employed in the present research revealed that reinforcing steel embedded in AABCs have a higher resistance to corrosion compared to steel bars embedded in Portland cement (OPC)-based concrete. It should be noted that the B constant values obtained for AABC differ from the values commonly used in (OPC)-based concretes. In addition, the results indicate that the ranges of corrosion probability, such as half-cell potentials or corrosion currents, specified for OPC concretes should be checked for its application in alkali-activated concretes.


Introduction


Reinforced concrete based on ordinary Portland cement (OPC) is one of the most widely used materials in the civil industry due to its versatility, properties and low cost. One of the most important factors for the construction industry is the durability, which is determined by the useful life of the material under real service conditions, including its exposure to aggressive environments [1]. Durability is not an intrinsic property of a material, since it depends on the conditions of service, so that in concrete it is known to vary according to the type of environment to which it is exposed. One of the biggest threats that reinforced concrete faces is the corrosion of reinforcing steel due to cracking, delamination, and in severe cases, the partial or total collapse of a structure. The primary cause is the exposition to aggressive environments such as CO2 and/or the entry of chloride (Cl−) ions [[2], [3], [4], [5]]. These agents have been responsible for most structural damage and, therefore, a significant increase in investment in structure maintenance and repair. Chloride ions can come from a range of sources – marine environments, the use of de-icing salts (≈NaCl), chemical substances coming into contact with the concrete, or they may be present in the concrete mix, as happens with the inclusion of some types of additives (CaCl2) during production. Chlorides diffuse through the concrete and, on reaching a critical concentration near the steel, cause destruction of the passive layer and initiate the corrosive process, generating pitting corrosion in the steel [6,7]. In addition to concrete durability, a major concern is the environmental impact associated with production, especially relating to the use of Portland cement (OPC). Indeed, the OPC industry generates annually 2 billion tons of CO2, corresponding to 8–۱۰% of greenhouse gas emissions into the atmosphere [[8], [9], [10]]. For this reason, research applied to the development of alternative low carbon footprint cementitious materials is a priority for the construction sector [11]. Among these alternatives, alkali-activated materials (AAMs) have caught attention. These are obtained from chemical interaction between an alumina-silicate material (precursor) and a strongly alkaline solution (activator) [[12], [13], [14]]. AAMs are synthesized at temperatures between 25 and 100 °C, while OPC production temperatures rise to 1460 °C to obtain clinker. AAMs can thus be considered as potential low carbon cements [15]. These types of materials also have structural mechanical strengths and physical characteristics such as reduced permeability and thermal stability [16,17].

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