مهندسی سازه و ساخت

مهندسی سازه و ساخت

تفاوت اثر جایگزینی سیمان با خاکستر و بایوچار پوسته برنج بر خصوصیات فیزیکی و ‏مکانیکی ملات سیمانی تقویت شده با الیاف

نوع مقاله : علمی - پژوهشی

نویسندگان
1 دانشجوی کارشناسی ارشد، گروه سازه و زلزله، دانشکده مهندسی عمران، دانشگاه صنعتی نوشیروانی بابل، بابل، ایران
2 استاد، گروه سازه و زلزله، دانشکده مهندسی عمران، دانشگاه صنعتی نوشیروانی بابل، بابل، ایران
چکیده
افزایش انتشار گازهای گلخانه‌ای و رشد مصرف سیمان، به‌عنوان یکی از پرکاربردترین مصالح ساختمانی، از عوامل اصلی گرمایش جهانی ‏محسوب می‌شوند. استفاده از پسماندهای کشاورزی مانند پوسته برنج می‌تواند ضمن کاهش مشکلات زیست‌محیطی ناشی از دفع این ‏ضایعات، به کاهش مصرف سیمان نیز کمک قابل توجهی کند. در این پژوهش اثر جایگزینی 5% بایوچار پوسته برنج و 5% خاکستر پوسته ‏برنج به‌جای سیمان، همراه با تأثیر افزودن 3% الیاف فولادی سینوسی دوسر قلاب، بر خواص فیزیکی و مکانیکی ملات سیمانی مورد ‏بررسی قرار گرفت. نتایج نشان داد جایگزینی بایوچار و خاکستر موجب کاهش کارایی ملات شد. بایوچار با ساختار متخلخل خود ‏بیشترین اثر را در تسریع فرآیند گیرش داشت، به طوری‌که موجب کاهش حدود 46% در زمان گیرش اولیه و 29% در زمان گیرش نهایی ‏نسبت به نمونه شاهد گردید. جایگزینی 5% بایوچار موجب افزایش مقاومت فشاری بلندمدت تا حدود 14% در مقایسه با نمونه‌های شاهد ‏گردید. افزودن 3% الیاف به ملات حاوی خاکستر پوسته برنج، مقاومت خمشی و کششی بلندمدت را به‌ترتیب حدود 57% و 48% افزایش ‏داد. این نتایج نشان می‌دهد استفاده از بایوچار و خاکستر پوسته برنج، همراه با الیاف فولادی، می‌تواند ضمن بهبود خواص ملات، رویکردی ‏پایدار برای کاهش مصرف سیمان و اثرات زیست‌محیطی آن باشد.‏
کلیدواژه‌ها

موضوعات


عنوان مقاله English

The difference in the effect of replacing cement with rice husk ash and biochar ‎on the physical and mechanical properties of fiber-reinforced cement mortar

نویسندگان English

Hossein Gorji 1
Mehdi Dehestani 2
1 Graduate Student, Faculty of Civil Engineering, Babol Noshirvani University of Technology, Babol, Iran
2 Professor, Faculty of Civil Engineering, Babol Noshirvani University of Technology, Babol, Iran
چکیده English

In recent years, the Earth's temperature has risen due to the increase ‎in greenhouse gases. Cement production, as one of the most widely ‎used materials in the construction industry, is one of the contributors ‎to this issue. In the northern regions of the country, rice is cultivated ‎extensively, and rice husk is its waste byproduct, which requires ‎proper management. Utilizing rice husk in the form of biochar and ‎ash as a partial replacement for cement presents a promising solution ‎to the waste problem while also reducing the environmental impacts ‎of cement production. In this study, we investigated the effects of ‎replacing 5% of cement with rice husk biochar and 5% with rice husk ‎ash on the mechanical properties of mortar. Furthermore, the effect ‎of adding sinusoidal hook-ended steel fibers to the mortar on its ‎mechanical properties was also examined. The results indicated that ‎the addition of biochar and ash reduced cracks and voids, leading to ‎a denser mortar structure. However, their incorporation along with ‎steel fibers resulted in a reduction in the mortar’s workability. ‎Biochar was found to accelerate the setting process. Both rice husk ‎biochar and ash improved compressive strength. Moreover, the ‎addition of 3% steel fibers to mortar containing rice husk ash ‎increased flexural strength by 51% and tensile strength by 60% at 28 ‎days compared to the control specimen.‎

کلیدواژه‌ها English

Rice husk ash
Rice husk biochar
Metal fibers
Mechanical properties
Agricultural Waste
Sustainable Mortar
Cement Replacement
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  • تاریخ دریافت 21 تیر 1404
  • تاریخ بازنگری 31 شهریور 1404
  • تاریخ پذیرش 13 آبان 1404