مطالعه تغییرات مشخصات مکانیکی بتن‌های حاوی بنتونیت و زئولیت در جایگزینی سیمان

نوع مقاله : مقاله پژوهشی

نویسندگان

1 مهندسی عمران-سازه، دانشکده عمران، دانشگاه سمنان

2 عضو هیات علمی دانشگاه سمنان

چکیده

در عصر امروز ساخت مصالح ساختمانی مستلزم مصرف زیاد منابع طبیعی می­باشد. به جهت تأمین مصالح مورد نیاز برای تولید سیمان، آلودگی و تولید زباله‌های صنعتی افزایش می­یابد. زئولیت و بنتونیت از جمله پوزولان‌های طبیعی هستند که به راحتی قابل استخراج می‌باشند و با شرایط محیط زیست سازگاری دارند و از جمله موادی هستند که در مقایسه با سیمان پرتلند هزینه تولید کمتری دارند. در تحقیقات انجام شده، هر کدام از این پوزولان‌ها با مواد دیگر و یا به صورت منفرد مورد استفاده قرارگرفته‌اند. در این مقاله به بررسی مقاومت فشاری، جذب آب، مقاومت کششی و مدول الاستیسیته پرداخته شده است. در این تحقیق 10 مدل طرح اختلاط مورد بررسی قرار گرفته است، که نمونه‌های تولید شده با درصد بنتونیت و زئولیت متفاوت در آزمایشگاه ساخته و در سنین 7، 28 و 90 روزه مورد آزمایش قرار گرفته‌اند. جهت بررسی تأثیر رفتار استفاده از این مصالح به جای سیمان در بتن، نتایج به دست آمده با نمونه مرجع مورد مقایسه قرار گرفته است. بهترین ترکیب با جایگزینی 6 درصد زئولیت و 6 درصد بنتونیت بوده که پس از 28 روز، توانسته 93 درصد مقاومت نمونه مرجع با مقاومت 25/12 مگاپاسکال را کسب کند. درصد جذب آب نمونه‌های تولید شده با زئولیت و بنتونیت نسبت به نمونه مرجع افزایش یافته است و بهترین ترکیبات در کشش، نمونه­های با 10 درصد بنتونیت بوده­اند.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Mechanical Properties of Concrete Incorporating Bentonite and Zeolite as Replacement of Cement

نویسندگان [English]

  • fatemeh abdolshah 1
  • omid rezayfar 2
  • majid gholhaki 2
1 Structural Engineering, Faculty of Civil Engineering, Semnan University
2 Faculty Member of Semnan University
چکیده [English]

The production of concrete consumes huge amounts of natural resources. Due to the consumption of natural resources for cement production, using industrial waste materials has gained interest among researchers. Environmental issues are one of the most important issues that should be taken into consideration. Zeolite and bentonite are considered as natural pozzolans, they are easy to extract and count as environmentally-friendly raw material compared to ordinary Portland cement (OPC). In the current study, these materials were utilized blended with other materials and individually. Compressive strength, water absorption, tensile strength, and elastic modulus of concrete samples were evaluated. Moreover, 10 different mixing designs were designed to produce samples in the same curing condition with different content of bentonite and zeolite. These samples were cured for 7, 28, and 90 days. To investigate the properties of these materials as an alternative to OPC in the concrete, the results are compared with the blank sample. The optimum mixture was obtained by 6 wt. % of zeolite and 6 wt. % of bentonite, which was gained 93% of the compressive strength of the blank sample, i.e., 12.25 MPa, after 28 days of curing. This study also showed that the water absorption of samples with zeolite and bentonite had increased in comparison with the blank sample and the optimum amount in tension was observed 10 wt. % of bentonite.

کلیدواژه‌ها [English]

  • zeolite
  • Bentonite
  • Cement additives
  • Compressive Strength
  • Water Absorption
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