مطالعه آزمایشگاهی مشخصات مکانیکی و دوام بتن حاوی سنگدانه بتن بازیافتی و زئولیت

نوع مقاله : پژوهشی

نویسندگان

• مسعود سعادت خوش
• مهدی آرزومندی
• شقایق افشار

دانشکده فنی و مهندسی، دانشگاه شهاب دانش، قم.

10.22067/jfcei.2021.61272.0

چکیده

در سال‌های اخیر توسعه استفاده از بتن در صنعت ساختمان باعث افزایش آلودگی گازهای گلخانه_­ای ناشی از تولید سیمان شده ­­­است و از طرفی افزایش تولید نخاله­های ساختمانی و نبود مکان مناسب جهت دفن این زبالهها، باعث افزایش آلودگی محیط زیست گردیده است . امروزه استفاده از مواد بازیافتی و پوزولان‌ها در راستای کاهش هزینه‌های جاری و همچنین کاهش یا حذف مشکلات زیست محیطی به یکی از مباحث مورد علاقه اکثر محققین تبدیل شده است. در این پژوهش امکان استفاده از زئولیت و همچنین نخاله بتن بازیافتی به عنوان درصدی از سنگدانه­های مصرفی در بتن مطالعه شده است. برای این منظور از 14 طرح اختلاط (280 آزمونه) استفاده گردید و نقش جایگزینی درصدهای مختلف سنگدانه بازیافتی ریز­دانه، درشت­دانه و ترکیب ریزدانه و درشت­دانه (15 و 30 درصد) در بتن همراه با 10 درصد زئولیت  بر روی مقاومت فشاری، مقاومت کششی، مقاومت در برابر نفوذ یون کلراید و مقاومت ویژه الکتریکی بتن مورد ارزیابی قرار گرفت. در نهایت بر اساس نتایج به دست آمده، در بین نمونه­های بازیافتی نمونه با 15 درصد جایگزینی درشت دانه بازیافتی همراه با زئولیت، بیشترین درصد افزایش مقاومت فشاری وکششی، بتن با 15 درصد سنگدانه بازیافتی ترکیب ریزدانه و درشت­دانه همراه با زئولیت بیشترین افزایش مقاومت الکتریکی و مخلوط بتنی با جایگزینی 15 درصد سنگدانه بازیافتی درشت­دانه و 10 درصد جایگزینی پوزولان زئولیت، بیشترین کاهش نرخ نفوذ یون کلراید را نسبت به بتن معمولی ثبت کرده است.

کلیدواژه‌ها

• سنگدانه بتن بازیافتی
• زئولیت
• مشخصات مکانیکی بتن بازیافتی
• دوام بتن بازیافتی

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عنوان مقاله [English]

An Experimental Study on Mechanical properties and Durability of Concrete with Recycled Aggregate Concrete and Zeolite

نویسندگان [English]

• Masoud Saadatkhosh
• Mahdi Arezoumandi
• Shaghayegh Afshar

Shahab Danesh University, Qom, Iran.

چکیده [English]

Recently, there has been an increasing trend toward the use of sustainable materials. Sustainability helps the environment by reducing the consumption of non-renewable natural resources. Concrete – the second most consumed material in the world after water – uses a significant amount of non-renewable resources. Efforts aimed at producing environmentally friendly concrete can play a major role in securing sustainable construction.Candidate technologies for sustainable concrete materials include the incorporation of supplementary cementitious materials (SCMs) as a partial replacement for Portland cement; as well as recycled materials in concrete production. As a result, an experimental investigation was conducted to study the mechanical properties and durability of concrete constructed with 15% and 30% recycled aggregate concrete as well as 10% zeolite. This experimental program consisted of fourteen mix designs. Thecompressive strength,split tensile strength, electrical resistivity and chloride ion penetration of recycled concrete mixes were compared with the conventional concrete. Results of this study show that the zeolite and recycled aggregate concrete increased compressive strength,split tensile strength and electrical resistivity also decreased chloride ion penetration of concrete. To overcome inferior durability andmechanical properties of recycled mixes, zeolite (10%) has been added to recycled mixes. Results of the mixes including both recycled aggregate concrete and zeolite show superior durability (both electrical resistivity and chloride ion penetration) compared with the conventional concrete.

کلیدواژه‌ها [English]

• Recycled aggregate concrete
• Zeolite
• Mechanical properties of recycled concrete
• Durability of recycled concrete

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