بررسی اثر استفاده از نانوسیلیس بر روی خصوصیات مکانیکی ملات ماسه سیمان تحت تأثیر حرارت با نگرش به تغییرات نانوساختارهای سیمانی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری سازه، گروه مهندسی عمران، واحد سیرجان، دانشگاه آزاد اسلامی، سیرجان، ایران

2 دانشیار، دانشکده فنی، دانشگاه هرمزگان. استادیار دانشکده فنی مرودشت، دانشگاه فنی و حرفه‌ای

3 3- استادیار گروه مهندسی عمران، واحد سیرجان، دانشگاه آزاد اسلامی، سیرجان، ایران.

10.22124/jcr.2023.22616.1590

چکیده

در پژوهش حاضر تلاش شد تأثیر نانو سیلیس بر پارامتر‌های مقاومتی ملات ماسه-سیمان در درجه حرارت‌های زیاد بررسی شود. بدین منظور ملات ماسه-سیمان با جایگزینی 5، 10 و 15 درصد وزنی سیمان با نانوسیلیس تهیه شد و پس از عمل‌آوری در سنین 3، 28 و 90 روز تحت درجه حرارت‌های 25، 100، 200، 400، 600 و 800 درجه سلسیوس قرار گرفتند. بررسی اثر درجه حرارت‌های زیاد بر خواص فیزیکی و مکانیکی ملات ماسه-سیمان توسط آزمایش‌های درشت ساختاری مقاومت فشاری، افت وزنی و جذب آب و آزمایش‌های ریز‌ساختاری پراش پرتو ایکس (XRD) و میکروسکوپ الکترونی روبشی (SEM) مورد ارزیابی قرار گرفت. بر اساس نتایج حاصل از پژوهش،‌ رفتار درشت‌ساختاری ملات ماسه-سیمان به شدت وابسته به ریزساختار و تغییرات نانوساختارهای سیمانی ‌طی اعمال حرارت است. در دمای ºC 600 پرتلندیت اولیه کاملا تخریب و با خروج آب، CaO تشکیل شده است. در دمای ºC 800 نیز از تخریب نانوساختار C-S-H علاوه بر آلیت (C3S) و بلیت (C2S)، بتا ولاستونیت نیز تشکیل شده است. افزودن نانوسیلیس باعث بهبود خصوصیات مقاومتی ملات ماسه-سیمان در برابر حرارت شده است به طوریکه مقاومت فشاری آزمونه‌های 28 روزه فاقد نانوسیلیس با افزایش دما تا ºC 800 با 57% افت مواجه شده و از MPa 1/31 به MPa 3/13 رسیده است در حالی‌که مقاومت فشاری آزمونه‌های ملات ماسه-سیمان حاوی 15% نانوسیلیس با اعمال درجه حرارت ºC 800 کمتر دچار افت مقاومت شده و با 52% کاهش از MPa 2/40 به MPa 2/19 رسیده است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Examining the Effects of Using Nano-silica on the Mechanical Properties of Sand-cement Mortar Under the Effects of Heat, Considering Cementitious Nanostructure Changes

نویسندگان [English]

  • Motahreh Nasehi Geshooieh 1
  • mohammad amiri 2
  • mohsen malekinejad 3
1 Ph.D. Candidate of Civil Engineering, Department of Civil Engineering, Sirjan Branch, Islamic Azad University, Sirjan, Iran.
2 Associate professor, University of Hormozgan, Faculty of Engineering, Bandar Abbas, Iran
3 3. Assistant Professor, Department of Civil Engineering, Sirjan Branch, Islamic Azad University, Sirjan, Iran.
چکیده [English]

The present research investigates the effects of nano-silica on strength parameters of sand-cement mortar at high temperatures. For this, sand cement mortar replacing 5, 10 and 15 wt% of cement with nano-silica was prepared. The mortar, having been processed at 3, 28 and 90-day ages, was subjected to 25, 100, 200, 400, 600 and 800 ºC, respectively. Effects of high-temperature rates on the physical and mechanical properties of the sand-cement mortar were examined by macrostructural experiments of compressive strength, weight loss and water uptake, as well as microstructural experiments using XRD and SEM. The research found that the macrostructural behavior of sand-cement mortar was highly dependent on microstructures and nanostructure cementitious changes when subjected to heat. At 600 ºC, the initial portlandite was fully degraded, which caused the CaO to form as water exited. At 800 ºC, in addition to alite (C3S) and Belite (C2S), β- Wollastonite was formed from the degradation of the C-S-H nanostructure. The addition of nano-silica improved the strength properties of the sand cement mortar against heat, with the compressive strength of the 28-day samples without nano-silica experiencing a 57% weight loss as the temperature rose to 800 ºC, decreasing from 31.1 MPa to 13.3 MPa. On the other hand, the compressive strength of the sand cement mortar samples containing 15% nano-silica experienced lesser strength loss (52%) at 800 ºC, decreasing from 40.2 MPa to 19.2 MPa.

کلیدواژه‌ها [English]

  • Sand Cement Mortar
  • High-temperature Concrete
  • Cementitious Nanostructures
  • Nano-silica
  • Compressive Strength

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