مطالعه آزمایشگاهی برخی خواص فیزیکی و مکانیکی بتن گوگردی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 فارغ التحصیل کارشناسی ارشد رشته سازه‌های آبی دانشگاه تهران

2 استادیار گروه آبیاری و آبادانی دانشگاه تهران

3 استادیار پژوهشی موسسه تحقیقات فنی و مهندسی کشاورزی

چکیده

بتن پلیمر گوگردی، ماده­ای ساختمانی است که از ترکیب سیمان گوگردی اصلاح شدهبه صورت مذاب (با استفاده از
افزودنی­های پلیمری) و مصالح سنگی درشت­دانه و ریزدانه حاصل می­شود.  در این تحقیق تأثیر مقدار سیمان گوگردی و زمان عمل­آوری بر خواص مکانیکی و فیزیکی بتن پلیمر گوگردی بررسی شده است.  بدین منظور با استفاده از گوگرد اصلاح شده با افزودنی پلیمر هیدروکربن اولفین و سنگدانه­های رایج برای بتن معمولی، نمونه­های آزمایشی با درنظر گرفتن درصدهای مختلف مقدار سیمان گوگردی و 4 سطح زمان عمل آوری در 5 تکرار تهیه و تحت آزمایش­های تعیین خواص مکانیکی و فیزیکی قرار گرفتند.  خواص مکانیکی شامل مقاومت فشاری، نقطۀ تسلیم و مدول یانگ و خواص فیزیکی شامل وزن واحد حجم بتن، فضای خالی مصالح در بتن و درصد هوای بتن در نظر گرفته شد.  نتایج نشان می­دهد که خواص مکانیکی با افزایش گوگرد تا یک حد آستانه (بسته به دانه­بندی مصالح) افزایش و با تجاوز از آن کاهش می­یابد.  بتن پلیمرگوگردی مورد تحقیق، به طور متوسط 70 درصد مقاومت 28 روزه­اش را حدود 3 روز بعد از بتن­ریزی کسب می­کند.  مقایسه بین خواص فیزیکی و مقاومت فشاری 28 روزه نشان می­دهد که برای دستیابی به بالاترین مقاومت، دانه­بندی متراکم، مقدار گوگرد کافی برای پر کردن فضای خالی مصالح و تراکم بتن تا حداکثر وزن واحد حجم، لازم است.   

کلیدواژه‌ها


عنوان مقاله [English]

Mechanical and Physical Properties of Sulfur Polymer Concrete

چکیده [English]

 
Sulfur polymer concrete (SPC) is a construction material composed of melted modified sulfur cement (MSC) and fine and coarse aggregates. This research investigated the effects of the quantity of MSC and curing time on the mechanical and physical properties of SPC. Samples were prepared using five levels of MSC and four curing times. The MSC used contained olefin hydrocarbon polymeric additive and the aggregates were those commonly used for conventional concrete. The mechanical and physical properties of the samples (compressive strength, yield point and Young's modulus, unit weight, voids in the aggregate and concrete air content) were determined. The results showed that increasing in the amount of MSC up to a specific threshold value (depending on aggregate gradation) improved the mechanical properties of samples. Beyond the threshold point, a decreasing trend was observed. The SPC in the present study gained an average of 70% of its 28-day compressive strength by three days from concrete placement. The greatest 28-day compressive strength was achieved using the densest aggregate gradation, a sufficient amount of MSC to fill voids in the aggregate and the maximum unit weight of SPC.

کلیدواژه‌ها [English]

  • Sulfur polymer concrete
  • Modified sulfur cement
  • compressive strength
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