ارزیابی خصوصیات مهندسی بتن‌های خودتراکم ژئوپلیمری با استفاده از روش تاگوچی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری مهندسی عمران-سازه،دانشکده فنی مهندسی، دانشگاه بوعلی سینا، همدان، ایران

2 دانشیار گروه مهندسی عمران، دانشکده فنی مهندسی، دانشگاه بوعلی سینا، همدان، ایران

چکیده

در پژوهش حاضر در راستای توسعه پایدار و حفظ محیط‌زیست، از سرباره و خاکستربادی فعال‌شده در محیط قلیایی، به‌عنوان مواد چسباننده ژئوپلیمری جایگزین سیمان، در ساخت و ارتقا خصوصیات بتن‌های خودتراکم ژئوپلیمری استفاده گردیده است. محلول فعال‌ساز قلیایی حاوی سدیم هیدروکسید و سدیم سیلیکات مایع بوده است. عیار مواد چسباننده 500-700 کیلوگرم بر متر مکعب و نسبت آب به مواد چسباننده 45/0-48/0 بوده است. درصد یون سدیم 5-7 درصد عیار مواد چسباننده و نسبت سنگدانه درشت‌به‌ریز در سه سطح 75/25، 70/30 و 65/35 استفاده گردیده است. طراحی آزمایش‌ها با استفاده از روش تاگوچی و براساس آرایه متعامد L9 بوده است. 9 طرح مخلوط اصلی و 3 طرح مخلوط صحت‌سنجی بتن خودتراکم ژئوپلیمری ساخته شده است. مشخصات بتن تازه و خصوصیات مکانیکی از جمله مقاومت‌های فشاری و کششی دونیم‌شدن، مدول الاستیسیته و جذب آب بتن‌های خودتراکم ژئوپلیمری ارزیابی گردیده است. عیار مواد چسباننده و نسبت سنگدانه درشت به ریز بیشترین اثر را بر خصوصیات مکانیکی بتن‌های سخت شده، داشته‌اند. حداکثر مقاومت‌های فشاری و کششی دونیم‌شدن 58 و 5/4 مگاپاسکال، مدول الاستیسیته 32 گیگاپاسکال و حداقل جذب آب 8/2 درصد حاصل شده است. خصوصیات مکانیکی بتن‌های خودتراکم ژئوپلیمری با دقت مناسبی (967/0R²≥) با روش تاگوچی قابل تحلیل و پیش‌بینی بوده است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

An investigation on Engineering properties of Self-Compacting Geopolymer Concrete by Taguchi Method

نویسندگان [English]

  • shahriar abdolahzade 1
  • Mahmoud Nili 2
1 PhD Candidate, Department of Civil Engineering, Bu-Ali Sina University, Hamedan, Iran
2 Associate Professor, Department of Civil Engineering, Bu-Ali Sina University, Hamedan, Iran
چکیده [English]


In the present study, due to sustainable development and eco-friendly aims, alkali activated slag and fly ash were used as the geopolymer binder instead of cement in self-compacting concretes. The alkaline solution consisted of sodium hydroxide and sodium silicate solutions. Binder content was between 500-700 kg/m³ and water to binder (W/B) ratio varied from 0.45 to 0.48. Na₂O percentages were in the range of 5 - 7% and three ratios of coarse to fine aggregate (25/75, 30/70, 35/65) were used. Design of experiments was based on orthogonal L9 array of Taguchi methodology. A total of nine main mixes and three validation mixes were prepared. Fresh concrete characteristics and mechanical properties including compressive strength, splitting tensile strength, modulus of elasticity and water absorption were evaluated. The results demonstrated that the binder content and coarse to fine aggregate ratio were the most influential parameters on the mechanical properties. The highest compressive strength, splitting tensile strength and modulus of elasticity were belonging to the mixture with low W/B ratio and higher binder content by 58 MPa, 4.5 MPa and 32 GPa, respectively. Moreover, Taguchi method has a good capability (R²≥0.967) to analyze and predict the mechanical properties of self-compacting geopolymer concrete.

کلیدواژه‌ها [English]

  • Self -Compacting Geopolymer Concrete
  • Slag
  • Fly Ash
  • Modulus of Elasticity
  • Taguchi Method

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  • تاریخ دریافت: 23 اسفند 1401
  • تاریخ بازنگری: 15 خرداد 1402
  • تاریخ پذیرش: 12 شهریور 1402

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