تاثیر باکتری باسیلوس سابتیلیس بر خودترمیم شوندگی بتن های حاوی زئولیت

نوع مقاله : پژوهشی اصیل (کامل)

نویسندگان
1 گروه مهندسی عمران، مرکز میمند، دانشگاه آزاد اسلامی، میمند، ایران
2 گروه مهندسی عمران، واحد مرودشت، دانشگاه آزاد اسلامی، مرودشت، ایران
3 گروه میکروبیولوژی، واحد فیروزآباد، دانشگاه آزاد اسلامی، فیروزآباد، ایران
چکیده
امروزه استفاده از بتن های خودترمیم شونده مورد توجه محققین مختلف قرار گرفته است. در مقاله حاضر به بررسی تاثیر باکتری باسیلوس سابتیلیس با غلظت‌های مختلف بر روی بتن‌های حاوی زئولیت پرداخته شده است. باکتری مذکور در آزمایشگاه تولید و به طرح اختلاط بتن اضافه گردید. جهت ارزیابی تاثیر باکتری باسیلوس سابتیلیس بر روی نمونه‌های دارای زئولیت، آزمایشات مقاومتی و دوام از جمله آزمایش مقاومت فشاری، آلتراسونیک، نفوذ ناپذیری و جذب آب در سنین مختلف بر روی آزمونه‌ها انجام گرفت. همچنین با استفاده از میکروسکوپ الکترونی روبشی (SEM) و میکروسکوپ نوری ترمیم شوندگی بتن مورد ارزیابی قرار گرفت. نتایج حاصل از آزمون مقاومت فشاری نشان داد، نمونه های حاوی زئولیت با غلظت 8^10×2.8 سلول بر میلی لیتر منجر به افزایش 16.76 درصدی مقاومت فشاری و نمونه‌های بدون زئولیت 13.51 درصد مقاومت فشاری را افزایش دادند. همچنین وجود باکتری در طرح اختلاط منجر به کاهش حدودا 15 درصدی جذب آب نمونه‌های بدون زئولیت و 30 درصدی نمونه‌های دارای زئولیت گردید. بر اساس نتایج آزمایشات انجام شده مناسب‌ترین غلظت، جهت بهبود همزمان پارامترهای مقاومتی و دوام از بین غلظت‌های مختلف باکتری باسیلیس سابتیلیس، غلظت 8^10×2.8 سلول بر میلی لیتر پیشنهاد می‌گردد.

کلیدواژه‌ها

موضوعات


عنوان مقاله English

The Effect of Bacillus Subtilis on Self-healing of Zeolite Concretes

نویسندگان English

M.R. Baradaran 1
M. Sadeghpour 2
S. Afsharipour 3
1 Department of Civil Engineering, Meymand center, Islamic Azad University, Meymand, Iran.
2 Department of Civil Engineering, Marvdasht Branch, Islamic Azad University, Marvdasht, Iran.
3 microbiology department, Firoozabad Branch, Islamic Azad University, Firoozabad, Iran.
چکیده English

Today, the use of self-healing concretes has attracted the attention of various researchers. In this paper, the effect of Bacillus subtilis bacteria with different concentrations were used for evaluation on concrete containing zeolite.The mentioned bacteria were produced in the laboratory and added to the concrete mixing plan. In order to evaluate the effect of Bacillus subtilis bacteria on specimen with zeolite, resistance and durability tests including compressive strength, ultrasonic, water penetration test and water absorption tests were performed on the specimen at different ages. Also, using scanning electron microscope (SEM) and optical microscope, the self-healing of concrete was evaluated. The results of the compressive strength test showed that the specimen containing zeolite with a concentration of 2.8×108 cells/ml increased the compressive strength by 16.76% and the specimen without zeolite increased the compressive strength by 13.51%. Also, the presence of Bacillus subtilis bacteria in the mixing design led to a 15% decrease in water absorption of specimens without zeolite and 30% of specimens with zeolite. Based on the results of the experiments, the most suitable concentration, for the simultaneous improvement of the resistance parameters and durability among the different concentrations of Bacillus subtilis bacteria, is suggested to be 2.8 x 108.

کلیدواژه‌ها English

Self-healing concrete
Bacteria
Bacillus subtilis
Zeolite
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