بررسی تاثیر فرایندهای متابولیک باکتری باسیلوس سوبتیلیس بر خواص مکانیکی و جذب آب بتن

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشگاه جامع امام حسین(ع)

10.22124/jcr.2021.19288.1492

چکیده

بتن یکی از پرمصرف‌ترین مصالح ساختمانی در جهان است. محققین زیادی در تلاش هستند که بتوانند ضعف‌های بتن را رفع و هزینه‌های تعمیر و نگهداری آن را کاهش دهند. در سال‌های اخیر روش‌های نوینی برای بهبود خواص مکانیکی و دوامی بتن موردبررسی و تحقیق قرارگرفته است. یکی از این روش‌ها استفاده از نوع خاصی از باکتری‌ها است که بتوانند با عملکرد خود در داخل بتن باعث‌ ترمیم بتن شوند. باکتری‌های خانواده باسیلوس غالباً با تولید کلسیم کربنات قابلیت خود ترمیمی و پوشش ترک‌های ایجادشده در بتن را دارند. باکتری باسیلوس سوبتیلیس باکتری است که در خاک زندگی می‌کند و توانایی تجزیه اوره و کلسیم لاکتات را دارد که منجر به تولید کلسیم کربنات می‌شود. مقایسه این دو متابولیک باکتری باسیلوس سوبتیلیس می‌تواند باعث کاهش هزینه‌های تحقیق شود. همچنین اضافه کردن هر ماده‌ غیرمعمول در بتن نباید تأثیر منفی در خواص بتن ایجاد کند. بدین منظور در این تحقیق سعی شده است تأثیر باکتری و همچنین اثر افزودنی‌های مورد نیاز به منظور ارزیابی عملکرد باکتری در ترمیم بتن مورد بررسی قرار گیرد. در این راستا 6 طرح مورد بررسی قرار گرفت و نتایج آزمایش‌های مقاومت نشان داد عملکرد تجزیه کلسیم لاکتات توسط باکتری باسیلوس سوبتیلیس نسبت به تجزیه اوره بهتر بوده و باعث افزایش مقاومت فشاری به میزان 55 درصد می‌گردد. همچنین میزان رسوب کلسیم کربنات در عملکرد تجزیه کلسیم لاکتات بیشتر از عملکرد تجزیه اوره است. ساختار ریز مقیاس نمونه‌های بتنی که توسط تصاویر میکروسکوپ الکترونی برداشت گردید نیز مؤید نتایج به دست آمده است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

The effect of metabolic processes of Bacillus subtilis on mechanical properties and water absorption of concrete

نویسندگان [English]

  • Amin Jafarniya
  • Mohammad Fayyaz
  • Mir Morteza Sadat Ebrahimi
Imam Hossein University
چکیده [English]

In recent years, new methods for improving the mechanical and durability properties of concrete have been studied and researched. One of these methods is the use of a special type of bacteria that can repair the concrete with their performance inside the concrete.For this purpose, Bacillus subtilis PTCC 1254 strain was used. Adding any unusual material to the concrete should not adversely affect the properties of the concrete. To investigate these effects, 6 mixing designs were investigated. The control design, which is expressed in the text as N; It has been proposed without any bacteria or additives. In the mixing desing called BU, bacteria are added to the concrete mix water with a concentration of 108 cell/ml. Also for bacteria anaerobic function and urea decomposition for produce calcium carbonate, Yeast extract, urea and calcium nitrate are added to the mixture. The mixing design, called BL, contains bacteria with a concentration of 108 cell / ml, yeast extract and calcium lactate. In other mixing design, the bacterial effect alone (B), the lactate effect (L) and the urea effect without the presence of the bacterium (U) are investigated. To investigate the effectiveness of these materials, 28- and 90-day compressive strength tests as well as concrete water absorption were taken. The results of this study showed that the bacterium did not have a negative effect on the properties of concrete. Also, the bacteria with calcium lactate improved the mechanical properties and permeability of concrete.

کلیدواژه‌ها [English]

  • Concrete
  • bacteria
  • self-healing
  • cracking
  • compressive strength

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