بررسی خصوصیات مکانیکی و ویژگی‌های شکست بتن ژئوپلیمری مسلح شده به الیاف بازیافتی

نوع مقاله : مقاله پژوهشی

نویسندگان

ﮔﺮوه ﻣﻬﻨﺪﺳﯽ ﻋﻤﺮان، واحد شبستر، داﻧﺸﮕﺎه آزاد اسلامی، شبستر، اﯾﺮان.

چکیده

بتن ژئوپلیمری به‌عنوان جایگزینی پایدار برای سیمان، با استفاده از فعال سازی پوزولان‌ها تولید می‌شود. این نوع بتن از مزایای زیست محیطی بسیاری، از جمله کاهش انتشار CO2، برخوردار است. با این حال، بتن ژئوپلیمری دارای معایبی همچون ضعف در مقاومت خمشی، می‌باشد. افزودن الیاف می‌تواند تردشکنی و شکل‌پذیری آن را از طریق پل‌زنی ترک‌ها و افزایش تغییرشکل بهبود بخشد. در این پژوهش، شش طرح اختلاط با استفاده از محلول سدیم هیدروکسید ۸، ۱۰ و ۱۲ مولار برای فعال سازی پوزولان طراحی شد. به منظور بهبود خواص مکانیکی، از الیاف نخ تایر بازیافتی استفاده گردید. نمونه‌ها تحت سه دمای عمل‌آوری محیط، ۶۰ و ۱۰۰ درجه سانتی‌گراد عمل‌آوری شده و مقاومت فشاری، خمشی، انرژی شکست و مدول الاستیسیته آن‌ها اندازه گیری شد. نتایج نشان داد افزایش غلظت محلول سدیم هیدروکسید موجب کاهش 7 تا 32 درصدی مقاومت فشاری، خمشی و مدول الاستیسیته می‌شود و محلول 8 مولار بهترین عملکرد را داشت. استفاده از الیاف نخ تایر بازیافتی در مقدار 1 درصد، مقاومت فشاری و مدول الاستیسیته را 9 تا 50 درصد نسبت مقدار 2 درصد افزایش داد، در حالی که نمونه‌های حاوی 2 درصد الیاف مقاومت خمشی و انرژی شکست را 2 تا 6 درصد بهبود بخشید که بیانگر بهبود چقرمگی بوده است. عمل‌آوری در دماهای 60 و 100 درجه سانتی‌گراد روند رشد مقاومت را ظرف 72 ساعت به میزان 88 تا 95 درصد تسریع بخشیدند. نتایج حاصل نشان می‌دهد که بتن ژئوپلیمری قابلیت جایگزینی بتن معمولی را داشته و الیاف نخ تایر بازیافتی عملکرد آن را بهبود بخشیده است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigation of the Mechanical Properties and Fracture Characteristics of Fiber-Reinforced Geopolymer Concrete Using Recycled Fibers

نویسندگان [English]

  • Seyed Ehsan Seyed Hassani
  • Yashar Yasrebinia
  • Mohammad Saberi
  • Reza Vojoudi Mehrabani
  • Masoud Motallebian
Department of Civil Engineering, Shab.C., Islamic Azad University, Shabestar, Iran.
چکیده [English]

Geopolymer concrete, as a sustainable alternative to Portland cement, is produced through the alkaline activation of pozzolanic materials. This type of concrete offers several environmental advantages, notably the reduction of CO₂ emissions. However, one of its main drawbacks is its relatively low flexural strength. The incorporation of fibers can enhance its ductility and reduce brittleness by bridging cracks and increasing deformation capacity.

In this study, six geopolymer concrete mix designs were prepared using 8, 10, and 12 molar sodium hydroxide solutions for pozzolan activation. To improve mechanical properties, recycled tire cord fibers were incorporated into the mixes. The specimens were cured under three different conditions: ambient temperature, 60°C, and 100°C. Compressive strength, flexural strength, fracture energy, and elastic modulus were measured for each case.

The results showed that increasing the concentration of the sodium hydroxide solution led to a 7 to 32% reduction in compressive strength, flexural strength, and modulus of elasticity, while the 8-molar solution exhibited the best performance. Using 1% recycled tire cord fibers increased the compressive strength and modulus of elasticity by 9 to 50% compared to the 2% dosage. In contrast, specimens containing 2% fibers improved the flexural strength and fracture energy by 2 to 6%, indicating enhanced toughness. Curing at temperatures of 60 and 100°C accelerated strength development, achieving 88 to 95% of the ultimate strength within 72 hours. The obtained results indicate that geopolymer concrete has the potential to replace conventional concrete, and recycled tire cord fibers improve its performance.

کلیدواژه‌ها [English]

  • Geopolymer concrete
  • Curing temperature
  • Fracture energy
  • Mechanical properties

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