بررسی مشخصات مکانیکی و دوام بتن خود ترمیم شونده حاوی باکتری رسوب دهنده کربنات کلسیم ایموبلایز شده در پرلیت

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه میکروبیولوژی، واحد تهران مرکز، دانشگاه آزاد اسلامی، تهران، ایران

2 گروه مهندسی عمران، واحد تهران غرب، دانشگاه آزاد اسلامی، تهران، ایران

3 گروه میکروبیولوژی، واحد تهران شمال، دانشگاه آزاد اسلامی، تهران، ایران

10.22124/jcr.2022.21339.1544

چکیده

امروزه ترکیبات خود ترمیم کننده بعنوان مصالح هوشمند در بهبود خصوصیات مواد، در بسیاری از صنایع مورد استفاده قرار می‌گیرند. یکی از روشهای خود ترمیمی بتن، استفاده از مکانیسم رسوب کربنات کلسیم ناشی از فعالیت میکروبی می‌باشد. این مقاله به بررسی تأثیر استفاده از باکتری اسپورو‌سارسینا در بهبود مشخصات مکانیکی و دوام بتن پرداخته است. به این منظور از سنگدانه پرلیت بعنوان حامل استفاده شده و باکتری در آن ایموبلایز شده است.

باکتری اسپورو‌سارسینا در پنج غلظت مختلف (cfu/ml 109×7/6 و 109×2/5 ، 109×4 ، 109×6/2 ،109×5/1) در بتن مورد استفاده قرار گرفته و با آزمونه شاهد فاقد باکتری مقایسه شده است. بعد از ساخت و عمل آوری، پارامترهای مختلف از قبیل مقاومت فشاری، مقاومت کششی، میزان نفوذپذیری در برابر آب و یون کلر در آزمونه‌ها در سه سن 7، 28 و 90 روزه مورد ارزیابی قرار گرفت. همچنین ریزساختار تعدادی از مخلوط‌ها با استفاده از میکروسکوپ الکترونی روبشی بررسی شد. نتایج آزمایش‌های انجام شده نشان داد که مقاومت فشاری و مقاومت کششی آزمونه‌های حاوی باکتری به علت فعالیت میکروبی با افزایش روبرو شده و میزان نفوذپذیری آن کاهش می‌یابد. میزان افزایش مقاومت فشاری در نمونه حاوی باکتری با غلظت cfu/ml 109×6/2 حدود بیست و سه درصد اندازه‌گیری گردید.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Mechanical and durability properties of self-healing concrete containing carbonate precipitation bacteria immobilized in perlite

نویسندگان [English]

  • Motahhareh Nezafat Tabalvandani 1
  • Mehdi Esfandi Sarafraz 2
  • Maryam Tajabadi-Ebrahimi 1
  • Abbas Akhavan Sepahy 3
1 Department of Microbiology, Islamic Azad University, Central Tehran Branch, Tehran, Iran
2 Department of Civil Engineering, Islamic Azad University, West Tehran Branch, Tehran, Iran
3 Department of Microbiology, Islamic Azad University, North Tehran Branch, Tehran, Iran
چکیده [English]

Today, self-healing materials are used as intelligent materials in improving the properties of structures in many industries. One of the methods of self-healing in concrete is the use of calcium carbonate precipitation mechanism due to microbial activities. This research evaluated the effects of a specific strain of Sporosarcina pasteurii bacteria as a new method on the mechanical and durability properties of self-healing concrete. For this purpose, perlite aggregate was used as a carrier, and bacteria were immobilized in it.

Five different cell concentrations (1.5×109, 2.6×109, 4×109, 5.2×109, 6.7×109 cfu /ml) of bacteria were used in the concrete mixtures and compared with a control mixture without bacteria. The compressive strength, tensile strength, water permeability, and chloride ion penetration at the age of 7, 28, and 90 days were tested. Also, the microstructure of some mixtures was investigated by Scanning Electron Microscope. The test results demonstrated that the use of Sporosarcina pasteurii immobilized in perlite improved the compressive and tensile strength, reduced the permeability of concrete. Maximum increase (23%) in compressive strength was measured with 2.6×109 cfu/ml of bacteria.

کلیدواژه‌ها [English]

  • Self-healing concrete
  • Bacteria
  • Calcium carbonate precipitation
  • Compressive strength
  • Durability

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