بررسی دوام در برابر سیکل‌های ذوب و یخ و مقاومت کششی بتن حاوی سیمان نانو لوله‌های کربنی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی مکانیک، دانشگاه پیام نور، تهران، ایران

2 دانشکده مهندسی عمران و محیط زیست، دانشگاه تربیت مدرس، تهران، ایران

10.22124/jcr.2026.27719.1662

چکیده

استفاده از نانو لوله‌های کربنی سنتز شده به صورت درجا، با استفاده از روش رسوب بخار شیمیایی در فرایند تولید سیمان به منظور بهسازی دوام بتن مورد توجه بسیاری از محققین قرار گرفته‌‌است. در این پژوهش محدوده مناسب استفاده از این نانو لوله‌ها در شرایط چرخه ذوب و یخ و مقاومت کششی مورد بررسی قرار گرفت. پس از افزودن سیمان حاوی نانو لوله‌های کربنی سنتز شده به صورت درجا در درصدهای مختلف (0، 4، 6، 8، 10 و 12) به نمونه‌های بتنی، افت وزنی نمونه‌ها در شرایط چرخه ذوب و یخ به عنوان عاملی برای تشخیص تأثیر این سیمان، اندازه‌گیری شد. میزان افت وزنی در نمونه شاهد (بدون نانو لوله) برابر 82/5 درصد و برای نمونه‌های سیمان حاوی نانو لوله 4، 6، 8، 10 و 12 درصد، به ترتیب میزان افت وزنی 74/1، 75/1، 38/1، 02/1 و 68/1 درصد بعد از 300 چرخه ذوب و یخ می‌باشد. افزودن 10 درصد از سیمان حاوی نانولوله‌های کربنی سنتز شده به صورت درجا به نمونه‌های بتنی، باعث شده است تا کمترین افت وزنی بدست آید. مقاومت کششی غیر مستقیم نمونه‌ها نیز به عنوان پارامتری مهم در طراحی سازه‌های بتنی، با استفاده از آزمایش کشش غیر مستقیم اندازه-گیری شد. نمونه‌های حاوی 8 درصد از این سیمان بیشترین مقاومت کششی را داشتند که تقریبا 24 درصد بیشتر از نمونه شاهد است. به منظور شناخت بهتر سیمان مورد نظر و هم‌چنین ریزساختار نمونه‌ها، مشاهدات FESEM نیز انجام شد. نتایج FESEM حاکی از تأمین پراکندگی مناسب نانولوله‌ها و عدم انباشتگی آن‌ها در ماتریس سیمانی بوده است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigation on The Durability Against Freeze-Thaw And Splitting Tensile Strength of Concrete Containing Cement Incorporating CNTs

نویسندگان [English]

  • moslem mohammadi soleymani 1
  • Sina Nezhad mohammadi 2
1 Department of Mechanical Engineering, Payame Noor University, P.O. Box 19395-3697, Tehran, Iran
2 Department of Civil Engineering, Tarbiat Modares University, Tehran, Iran
چکیده [English]

The use of in situ synthesized carbon nanotubes, using chemical vapor deposition in the cement production process, to improve the durability of concrete has attracted the attention of many researchers. In this study, the appropriate range of use of these nanotubes under freeze-thaw cycle conditions and tensile strength was investigated. After adding cement containing in-situ synthesized carbon nanotubes at different percentages (0, 4, 6, 8, 10, and 12) to concrete samples, the weight loss of the samples under freeze-thaw cycle conditions was measured as a factor to determine the effect of this cement. The weight loss in the control sample (without nanotubes) was 5.82%, and for the cement samples containing 4, 6, 8, 10, and 12% nanotubes, the weight loss was 1.74, 1.75, 1.38, 1.02, and 1.68%, respectively, after 300 freeze-thaw cycles. Adding 10% of cement containing in-situ synthesized carbon nanotubes to concrete samples resulted in the lowest weight loss. The indirect tensile strength of the samples, as an important parameter in the design of concrete structures, was also measured using indirect tensile testing. Samples containing 8% of this cement had the highest tensile strength, which is approximately 24% higher than the control sample. In order to better understand the desired cement and also the microstructure of the samples, Field Emission Scanning Electron Microscopy (FESEM) observations were also performed. The FESEM results indicated that the nanotubes were properly dispersed and did not aggregate in the cement matrix.

کلیدواژه‌ها [English]

  • CNT
  • Concrete
  • Durability
  • Microstructure
  • Weight loss
  • Tensile strength

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