استفاده از بنتونیت در جایگزینی بخشی از سیمان در بتن‌های کم مقاومت

نوع مقاله : مقاله پژوهشی

نویسندگان

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

2 دانشیار دانشکده مهندسی عمران دانشگاه سمنان

3 دانشیار دانشکده مهندسی عمران دانشگاه سمنان,

چکیده

استفاده از مواد پوزولانی در ساخت بتن، راه‌حل مناسبی برای کاهش منابع انرژی، تولید گازهای گلخانه‌ای و مصرف سیمان می‌باشد. در این مقاله تاثیر استفاده از بنتونیت سمنان به جای بخشی از سیمان در بتن‌های کم مقاومت بررسی شده است. در این مقاله 10 طرح مخلوط به همراه طرح مخلوط نمونه کنترل ساخته و مقایسه شده است. متغیر اصلی، تغییر نسبت بنتونیت به وزن سیمان می‌باشد که درصدهای 5، 10، 15، 20، 25، 30، 35، 40، 45 و50 در نظر گرفته شده است. آزمایش‌های مقاومت فشاری و مقاومت کششی دو نیم شدن نمونه‌ها، برای بررسی خواص بتن، انجام شده است.
با توجه به نتایج آزمایش مقاومت فشاری، استفاده از بنتونیت به جای بخشی از سیمان (مقاومت فشاری نمونه 5BC، MPa 1۷/20) باعث افزایش 7/2% مقاومت فشاری نسبت به نمونه شاهد (مقاومت فشاری نمونه CM، MPa 62/19) شده است. با جایگزین کردن 50% بنتونیت نسبت به وزن سیمان (نمونه 50BC)، مقاومت فشاری به میزان 40% کاهش یافته است. با توجه نتایج در مخلوط‌های حاوی بنتونیت در صورتی که مقدار بنتونیت بیش از 25% وزن سیمان شود، مقاومت کششی تا70% نسبت به CM کاهش می‌یابد.
 

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Utilization of bentonite as partial replacement of cement in low-strength concrete

نویسندگان [English]

  • Seyedeh Marzieh Qiyami Taklymi 1
  • Omid Rezaifar 2
  • Majid Gholhaki 3
1 M.Sc., Structural Engineering, Faculty of Civil Engineering, Semnan University, Semnan, Iran
2 Associate professor, Faculty of Civil Engineering, Semnan University, Semnan, Iran
3 Associate professor, Faculty of Civil Engineering, Semnan University, Semnan, Iran
چکیده [English]

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 in low-strength concrete.
Ten bentonite mixes and control mix were examined. The main variable is the proportion of bentonite (5%, 10%, 15%, 20%, 25%, 30% , 35%, 40%, 45% and 50% 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 and splitting tensile strength tests were performed.
According to the results of compressive strength test, using bentonite (compressive strength of 5BC sample is 20.17 MPa) results in 2.7% increase in compressive strength as compared with the control mix (compressive strength of control mix CM is 19.62 Mpa). By replacing 50% of bentonite with the weight of cement (sample 50BC), the compressive strength is reduced by 40%. According to the results in mixtures containing bentonite, if the amount of bentonite is more than 25% by weight of cement, the tensile strength is reduced by 70% compared to CM.

کلیدواژه‌ها [English]

  • : Pozzolanic Materials
  • Bentonite
  • Low Strength Concrete
  • Compressive strength
  • tensile strength
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