شناسایی خواص فیزیکی- مکانیکی دوغاب پایه سیمانی حاوی مواد معدنی و استفاده از آن در تقویت تیرهای بتن مسلح

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی، دانشگاه فردوسی مشهد، مشهد، ایران

چکیده

این پژوهش یک مطالعه‌ی آزمایشگاهی بر روی خصوصیات دوغاب‌های پایه سیمانی حاوی مواد معدنی مختلف (غبار کوره آهن‌گدازی، گل قرمز، پودر مرمر و پودر شیشه) می‌باشد که در این دوغاب‌ها درصدهای مختلف وزنی از مواد معدنی جایگزین بخشی از سیمان شده‌ است. به منظور بررسی دقیق خصوصیات مکانیکی دوغاب‌ها، بر روی تمامی مصالح استفاده شده آزمایش‌های آنالیز شیمیایی بر اساس روش فلورسانس اشعه ایکس، تعیین اندازه ذرات توسط دستگاه آنالیز لیزری ذرات، تجزیه و تحلیل ریزساختار با استفاده از تصاویر میکروسکوپ الکترونی روبشی و آزمایش طیف‌سنجی پراش اشعه ایکس انجام گرفت. بر روی دوغاب‌های پایه سیمانی، آزمایش‌های مقاومت فشاری در سنین 7، 28 و 90 روز، مقاومت کششی در سنین 7 و 28 روز، جذب آب 30 دقیقه‌ای، 24 ساعته و 72 ساعته در سن 90 روز و مقاومت در برابر سولفوریک اسید در سن 28 روز انجام شد. نتایج نشان می‌دهد که استفاده از پودر مرمر برای جایگزینی بخشی از سیمان به مقدار 15 درصد، مقاومت فشاری را به مقدار قابل توجهی در سنین 7، 28 و 90 روزه افزایش می‌دهد. همچنین استفاده از پودر شیشه به مقدار 5 و 15 درصد و گل قرمز به مقدار 5 درصد برای جایگزینی بخشی از سیمان منجر به افزایش مقاومت کششی می‌شود. همچنین به منظور بررسی دقیق‌تر دوغاب پایه سیمانی در تقویت اعضای بتنی، کاربرد یکی از دوغاب‌ها در تقویت خمشی تیرهای بتنی مورد بررسی قرار گرفت. بدین منظور سه تیر بتن مسلح ساخته شده و تحت آزمایش خمش چهار نقطه‌ای قرار گرفتند. نتایج نشان می‌دهد که ظرفیت باربری تیر تقویت شده با دوغاب پایه سیمانی مسلح به شبکه الیافی تقریباً مشابه تیر تقویت شده با چسب اپوکسی به همراه ورق CFRP بوده و تقریباً 60 درصد از تیر بدون تقویت بیشتر می‌باشد. همچنین استفاده از دوغاب پایه سیمانی برای تقویت، مشکلات مربوط به چسب اپوکسی مانند عدم امکان نصب بر روی سطوح خیس و مقاومت پایین در برابر آتش سوزی را برطرف می‌نماید.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Analysis of mechanical-physical properties of cement-based mortar made with mineral materials and its usage for strengthening of RC beams

نویسندگان [English]

  • javad sabzi
  • Esfahani M. R.
Civil engineering department, Faculty of engineering, Ferdowsi university, Mashhad, Iran
چکیده [English]

The present study investigates the properties of cementitious mortars in which different portions of cement were replaced with mineral materials including electric arc furnace dust (EAFD), red mud (RM), marble powder (MP), and glass powder (GP). In order to study the mechanical properties of the mortars, the microstructure of mortars was analyzed using scanning electron microscope (SEM) images and energy dispersive X-ray spectroscopy (EDX) test results. Compressive strength at ages of 7, 28, and 90 days, tensile strength at ages of 7 and 28 days, water absorption with durations of 30 minutes, 24 hours, and 72 hours after 90 days of curing, and chemical resistance against sulfuric acid tests were carried out on hardened specimens cured for 28 days. The results show that replacing 15% of cement with marble powder significantly increased the compressive strength of specimens cured for 7, 28, and 90 days. Furthermore, replacing cement with 5 and 15% glass powder or 5% of red mud increased the tensile strength. In order to investigate the performance of the repair mortars, one of them was chosen for strengthening RC beams. Three RC beams were manufactured and tested through 4-point bending scheme. The results indicate that the load-carrying capacity of the strengthened beam by CFRP sheet and repair mortar was the same as the specimen strengthened by CFRP sheet and epoxy resin, and was 60% higher than that of the un-strengthened specimen. It should also be highlighted that using the repair mortar instead of epoxy resin addresses some issues including low resistance to fire and poor connection of FRP with wet surfaces.

کلیدواژه‌ها [English]

  • Cement based mortar
  • Mineral materials
  • Beam
  • Strengthening
  • Reinforced concrete (RC)

مراجع

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نشریه مهندسی عمران امیرکبیر
دوره 54، شماره 12
اسفند 1401
صفحه 4459-4482

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