بررسی آزمایشگاهی تأثیر بنتونیت در جایگزینی بخشی از سیمان بر خصوصیات مکانیکی بتن

نوع مقاله : علمی - پژوهشی

نویسندگان

1 مهندسی عمران، دانشکده مهندسی عمران، دانشگاه سمنان، سمنان، ایران

2 دانشیار، دانشکده مهندسی عمران، دانشگاه سمنان، سمنان، ایران

3 استاد، دانشکده مهندسی عمران، دانشگاه سمنان، سمنان، ایران

چکیده

رشد جمعیت و نیازهای متعدد جوامع، سبب افزایش روز افزون تقاضای سیمان شده است. ‌استفاده از مواد پوزولانی در ساخت بتن، راه‌حل مناسبی برای کاهش مصرف منابع انرژی، تولید گازهای گلخانه‌ای و مصرف سیمان می‌باشد. در این مطالعه تأثیر استفاده از بنتونیت سمنان به جای بخشی از سیمان بررسی شده است. در این مقاله هفت طرح اختلاط به همراه طرح اختلاط نمونه کنترل (CM) ساخته و مقایسه شده است. متغیر اصلی، تغییر نسبت بنتونیت به وزن سیمان می‌باشد که در بازه 5%، 10%، 15%، 20%، 25%، 30% و 35% در نظر گرفته شده است. آزمایش‌های مقاومت فشاری، مقاومت کششی شکافتگی نمونه‌ها و پیش‌بینی مدول گسیختگی برای بررسی خواص بتن، انجام شده است. با توجه به نتایج به دست آمده از آزمایش مقاومت فشاری، استفاده از بنتونیت به جای بخشی از سیمان به میزان 5 درصد، سبب افزایش 8 درصدی مقاومت فشاری 28 روزه نسبت به نمونه کنترل (Control Mix-CM) شده است. با جایگزین کردن 35% بنتونیت نسبت به وزن سیمان، مقاومت فشاری 28 روزه به میزان 21% کاهش یافته است. با توجه به نتایج مخلوط‌های حاوی بنتونیت در صورتی که مقدار بنتونیت بیش از 20% وزن سیمان باشد، مقاومت کششی 28 روزه نسبت به CM تا 45% کاهش می‌یابد. با توجه به نتایج،‌ در صورت جایگزینی 5% و 10% بنتونیت، مدول گسیختگی پیش‌بینی شده نسبت به نمونه CM، به ترتیب 7/3% و 1/3% افزایش می‌یابد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigation Experimental of the Effect of Bentonite as a Partial Replacement for Cement on Mechanical Properties of Concrete

نویسندگان [English]

  • Seyedeh Marzieh Qiyami Taklimi 1
  • Omid Rezayfar 2
  • majid Gholhaki 3
1 faculty of civil engineering,Semnan University,Semnan,Iran
2 Associate Proffessor, Faculty of Civil Engineering, Semnan University, Semnan, Iran
3 Professor, Faculty of Civil Engineering, Semnan University, Semnan, Iran
چکیده [English]

The continuous growth of the population will guarantee a massive demand for cement in the near future. Using pozzolanic materials in concrete manufacturing is intended as an optimal solution to lower the rate of greenhouse gas emission, and diminish energy resources and cement consumption. This research is aimed at evaluating Semnan Bentonite as partial replacement of cement. Seven bentonite mixes and control mix (CM) were examined. The main variable is the proportion of bentonite (5%, 10%, 15%, 20%, 25%, 30% and 35% by weight of cement) in replacement mode while the amount of cementitious material, water to cementitious material ratio, fine aggregate content were kept constant. To study properties of hardened concrete, compressive strength, splitting tensile strength tests and prediction of the modulus of rupture were performed. According to the results of compressive strength test, using 5% bentonite as partial replacement of cement, results in 8% increase in compressive strength 28 days as compared with the control mix. By replacing 35% of bentonite with the weight of cement, the compressive strength 28 days is reduced by 21%. According to the results in mixtures containing bentonite, if the amount of bentonite is more than 20% by weight of cement, the tensile strength 28 days is reduced by 45% compared to CM. According to the results, replacing 5% and 10% (by weight) of cement with bentonite, the predicted rupture modulus will increase by 3.7% and 3.1% compared to the CM, respectively

کلیدواژه‌ها [English]

  • Replacement of Cement
  • Bentonite
  • Compressive Strength
  • Tensile Strength
  • Rupture Modulus

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  • تاریخ دریافت: 22 فروردین 1400
  • تاریخ بازنگری: 01 خرداد 1400
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