تاثیر باکتری اسپوروسارسینا و خاکستر بادی بر توانایی خودترمیم شوندگی بتن

نوع مقاله : مقاله پژوهشی

نویسندگان

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

2 گروه مهندسی عمران، مرکز میمند، دانشگاه آزاد اسلامی، میمند، ایران

10.22124/jcr.2022.21953.1568

چکیده

در مقاله حاضر تاثیر باکتری بر روی خود ترمیم شوندگی بتن‌های حاوی خاکستر بادی مورد مطالعه قرار گرفته است. جهت ارزیابی از باکتری اسپوروسارسینا با چهار غلظت مختلف استفاده شده است. در بتن دارای خاکستر بادی، از خاکستر بادی معادل 20 درصد وزنی سیمان طرح اختلاط استفاده شده است. به منظور ارزیابی و کنترل نمونه‌ها از آزمایش‌های مخرب و غیر مخرب از جمله آزمایش اولتراسونیک در سنین 1، 3، 7، 14 و 28 روزه، آزمایش نفوذ ناپذیری و جذب آب در سن 28 روزه و آزمایش مقاومت فشاری در سن 7 و 28 روزه استفاده شده است. جهت ارزیابی تاثیر باکتری بر روی خود ترمیم شدن ترک‌های بتن، با استفاده از میکروسکوپ الکترونی روبشی (SEM) و میکروسکوپ نوری، ترک‌های بتن مورد مطالعه قرار گرفت. نتایج حاصل نشان می‌دهد غلظت 106×10.46 مناسب‌ترین غلظت باکتری اسپوروسارسینا جهت تولید کلسیت و پر شدن خلل و فرج‌های بتن توسط محصولات هیدراته ترکیبات کلسیم و سیلیکون می‌باشد. غلظت مذکور منجر به افزایش 36 درصدی مقاومت فشاری در نمونه‌های دارای خاکستر بادی و 30 درصدی در نمونه‌های بدون خاکستر بادی گردید. همچنین نتایج حاصل نشان داد افزایش غلظت باکتری، در مقاومت فشاری، جذب آب، نفوذ ناپذیری و سرعت امواج اولتراسونیک تغییرات محسوسی ایجاد نمی‌گردد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Effect of Sporosarcina bacteria and fly ash on concrete self-healing ability

نویسندگان [English]

  • Mahmoud Sadeghpour 1
  • mohammadreza baradaran 2
1 2- Department of Civil Engineering, Marvdasht Branch, Islamic Azad University, Marvdasht, Iran.
2 2- Department of Civil Engineering, Meymand center, Islamic Azad University, Meymand, Iran.
چکیده [English]

In this paper, the effect of bacteria on self-healing concrete with fly ash has been studied. Sporosarcina bacteria with four different concentrations were used for evaluation. In concrete with fly ash, fly ash is replaced by 20% by weight of cement of mixing design has been used. In order to evaluate and control the specimen, destructive and non-destructive tests such as ultrasonic, permeability, water absorption and compressive strength have been used. To evaluate the effect of bacteria on self-healing of concrete cracks, concrete cracks were studied using scanning electron microscopy (SEM) and light microscope. The results show that the concentration of 10.46 × 106 is the most suitable concentration of Sporosarcina for the production of calcite and filling the pores of concrete by products such as calcium carbonate. The mentioned concentration resulted in a 36% increase in compressive strength in specimen with fly ash and a 30% increase in specimen without fly ash. The results also showed that increasing the bacterial concentration did not cause significant changes in compressive strength, water absorption, impermeability and ultrasonic wave velocity.

کلیدواژه‌ها [English]

  • Self-healing concrete
  • Bacteria
  • Sporosarcina
  • Fly ash

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