تاثیر نانو کلوئید اکسید گرافن و نانو دی‌اکسید تیتانیوم بر خواص مکانیکی و نفوذ یون کلراید در بتن

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی عمران، واحد شیراز، دانشگاه آزاد اسلامی، شیراز، ایران

2 گروه مهندسی عمران، دانشکده‌ی عمران، دانشگاه صنعتی شریف (پردیس کیش)، کیش، ایران

چکیده

سازه‌های دریایی بتن مسلح که در مناطق ساحلی و خورنده باشند مورد هجوم یون‌‌های مخرب کلراید قرار می‌‌گیرند. علاوه بر این، امواج دریا و وزش طوفان‌های ساحلی با وارد آوردن تنش‌های موثر به بتن، موجب بروز خوردگی، ساییدگی، تغییرات متوالی خیس و خشک شدن و همچنین واکنش‌های شیمیایی یون‌های کلراید و سولفات در بتن می‌شوند. یکی از معضلات اصلی سازه‌های بتنی نزدیک به ساحل، نفوذپذیری بالای آن‌ها در برابر رطوبت و آب است که این ویژگی سبب بروز مشکلاتی نظیر خرابی و ترک‌خوردگی در تمامی بخش‌های بتن می‌شود. به‌ویژه، یون‌های کلراید و سولفات که از مهم‌ترین عوامل خوردگی بتن مسلح به شمار می‌روند، می‌توانند به راحتی به دلیل نفوذپذیری بالا وارد سازه شده و موجب آسیب‌های گسترده گردند. بنابراین باید با اتخاذ روش‌‌هایی بتوان میزان نفوذپذیری بتن را به حداقل رساند. در این تحقیق با هدف کاهش نفوذپذیری بتن و افزایش دوام آن در برابر نفوذ یون کلراید از ترکیب نانو کلوئید اکسید گرافن و نانو دی‌‌اکسید تیتانیوم در بتن استفاده شد. آزمایش‌‌های انجام شده در این تحقیق شامل اسلامپ، مقاومت فشاری در سنین مختلف، میزان جذب آب در بتن سخت شده و دوام بتن در برابر نفوذ یون کلراید به روش RCMT می‌‌باشد. نتایج این تحقیق نشان داد که استفاده از ترکیب نانو کلوئید اکسید گرافن و نانو دی‌‌اکسید تیتانیوم تاثیر محسوسی بر روی اسلامپ بتن نداشت. اما افزودن نانو کلوئید اکسید گرافن آثار مخربی بر روی واکنش هیداراتاسیون سیمان داشته و میزان مقاومت فشاری بتن را کاهش داد. بطوریکه افزودن 1/5% نانو کلوئید اکسید گرافن مقاومت فشاری 90 روزه بتن را تا 22/5% کاهش داد. در حالیکه این مقدار نانو کلوئید اکسید گرافن در بتن تا 47% میزان مساحت نفوذ یون کلراید را در بتن کاهش داد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

The Effect of Nanographene and Nano Titanium Dioxide on the Mechanical Properties and Chloride Ion Penetration in Concrete

نویسندگان [English]

  • Leila Shahryari 1
  • mohamadamin abedzadeh 2
  • hossein zarei 1
1 Assistant Professor, Department of Civil Engineering, Shi.C., Islamic Azad University, Shiraz, Iran
2 M.Sc. in Civil Engineering (Construction Engineering and Management), Faculty of Civil Engineering, Sharif University of Technology (Kish Campus), Kish, Iran
چکیده [English]

Reinforced concrete marine structures located in coastal and corrosive environments are subjected to the attack of destructive chloride ions. In addition, sea waves and coastal storms impose significant stresses on the concrete, resulting in corrosion, abrasion, repeated cycles of wetting and drying, and chemical reactions involving chloride and sulfate ions. One of the main challenges for concrete structures near the shore is their high permeability to moisture and water, which leads to issues such as deterioration and cracking throughout the concrete. In particular, chloride and sulfate ions, which are among the primary causes of corrosion in reinforced concrete, can easily penetrate the structure due to high permeability and cause extensive damage. Therefore, it is essential to employ methods to minimize the permeability of concrete. In this study, with the aim of reducing concrete permeability and improving its durability against chloride ion penetration, a combination of nanographene and nano titanium dioxide was used in the concrete mix. The tests conducted in this study included slump, compressive strength at different ages, water absorption in hardened concrete, and durability against chloride ion penetration using the RCMT method. The results demonstrated that the use of the nanographene and nano titanium dioxide combination did not significantly affect the concrete slump, but the addition of nanographene negatively impacted the cement hydration reaction and reduced the compressive strength of the concrete. Specifically, the addition of 1.5% nanographene decreased the 90-day compressive strength by up to 22.5%. However, this amount of nanographene reduced the chloride ion penetration area in the concrete by up to 47%.

کلیدواژه‌ها [English]

  • Chloride Ion Penetration
  • RCMT Method
  • Nanographene
  • Nano Titanium Dioxide
  • Marine Structures

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نشریه مهندسی عمران امیرکبیر
دوره 57، شماره 6
شهریور 1404
صفحه 1047-1072

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