بررسی و مقایسه مقاومت مکانیکی انواع بتن‌های خودترمیمی باکتریایی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری راه و ترابری، دانشکده مهندسی عمران، دانشگاه سمنان، سمنان، ایران

2 استاد، گروه راه و ترابری، دانشکده مهندسی عمران، دانشگاه سمنان، سمنان، ایران

3 استاد، گروه باکتری‌شناسی، دانشکده علوم پزشکی، دانشگاه تربیت مدرس، تهران، ایران

چکیده

ترک‌ها از عوامل اصلی خرابی بتن هستند که نفوذ محلول‌های شیمیایی را تسهیل کرده و بر ویژگی‌های سازه‌های بتنی تأثیر منفی می‌گذارند. برای رفع این مشکل، روش‌های مختلفی مانند مواد پوششی و چسب‌ها استفاده شده است. اما به دلیل هزینه‌بر بودن و مشکلاتی مانند لایه‌برداری، توجه به روش‌های جایگزین از جمله بتن‌های خودترمیم‌شونده افزایش یافته است. یکی از این روش‌ها، استفاده از میکروارگانیسم‌ها برای ترمیم ترک‌ها است. در این پژوهش، از باکتری باسیلوس سوبتیلیس استفاده شده که برخلاف سایر باکتری‌ها نیازی به میکروکپسول یا نانومواد ندارد و هزینه تولید آن کمتر است. استفاده از این باکتری باعث بهبود قابل توجهی در مقاومت فشاری، خمشی و کششی بتن شده است. نمونه‌های RB10 و RB12 بیشترین افزایش مقاومت را نشان داده‌اند؛ به طوری که نمونه RB10  دارای 100٪ افزایش در مقاومت خمشی و 5/76 درصد در مقاومت فشاری بوده است. همچنین، مقاومت کششی بتن با استفاده از این باکتری تا 15٪ افزایش یافته است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigating and Comparing the Mechanical Resistance of Bacterial Self-healing Concretes

نویسندگان [English]

  • abolfazl Noori Shahr Abadi 1
  • Gholamali Shafabakhsh 2
  • Bita Bakhshi 3
1 PhD Candidate of Road and Transportation, Faculty of Civil Engineering, Semnan University, Semnan, I.R. Iran.
2 Professor, Department of Road and Transportation, Faculty of Civil Engineering, Semnan University, Semnan, I.R. Iran.
3 Professor Department of Bacteriology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
چکیده [English]

Cracks are one of the main causes of concrete failure, facilitating the penetration of chemical solutions and negatively impacting the characteristics of concrete structures. To address this problem, various methods such as coatings and adhesives have been used. However, due to the high costs and issues like peeling, attention has shifted toward alternative methods, including self-healing concrete. One of these methods involves the use of microorganisms to repair cracks. In this study, Bacillus subtilis bacteria were used, which, unlike other bacteria, do not require microcapsules or nanomaterials, making it less expensive to produce. The use of this bacteria has significantly improved the compressive, flexural, and tensile strength of the concrete. The RB10 and RB12 samples showed the highest strength increases, with RB10 exhibiting a 100% increase in flexural strength and 76.5% in compressive strength. Additionally, the tensile strength of the concrete increased by up to 15% with the use of this bacteria.

کلیدواژه‌ها [English]

  • Mechanical strength of concrete
  • Bacillus subtilis
  • Bacterial self-healing

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  • تاریخ دریافت: 17 مرداد 1403
  • تاریخ بازنگری: 10 مهر 1403
  • تاریخ پذیرش: 24 مهر 1403

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