مهندسی سازه و ساخت

مهندسی سازه و ساخت

بررسی آزمایشگاهی تأثیر تخلخل و سرعت امواج التراسونیک بر مقاومت‌های مکانیکی ملات پایه سیمانی حاوی سنگدانه ضایعاتی کوره فولاد

نوع مقاله : علمی - پژوهشی

نویسندگان
سحر مهدی نیا 1
محمدرضا توکلی زاده 2
امیررضا مسعودی 2
1 دانشجوی دکتری، گروه مهندسی عمران، دانشگاه فردوسی مشهد، مشهد، ایران
2 استادیار، گروه مهندسی عمران، دانشگاه فردوسی مشهد، مشهد، ایران
10.22065/jsce.2025.518991.3706
چکیده
در سال‌های اخیر، استفاده از مصالح بازیافتی به‌منظور توسعه پایدار و کاهش آثار زیست‌محیطی صنعت ساخت‌وساز مورد توجه گسترده قرار گرفته است. از این رو، استفاده از سنگدانه‌های ضایعاتی کوره فولاد به‌عنوان جایگزین مصالح طبیعی، گامی مؤثر در کاهش اثرات زیست‌محیطی و مدیریت پسماندهای صنعتی است. در این راستا، شناخت رفتار مکانیکی ملات‌های حاوی سنگدانه‌های ضایعاتی و ارزیابی غیرمخرب خواص آن‌ها، ضرورتی انکارناپذیر برای طراحی بهینه مصالح نوین محسوب می‌شود. هدف این پژوهش، بررسی نوآورانه رابطه تخلخل و سرعت انتشار امواج التراسونیک با مقاومت‌های خمشی و فشاری ملات‌های پایه سیمانی در سن ۲۸ روزه می‌باشد. بدین منظور، تعداد ۱۸۰ نمونه در قالب ۳۶ طرح اختلاط با استفاده از سه رده سیمان (5/32، 5/42و 5/52 مگاپاسکال)، دو نوع سنگدانه (طبیعی و ضایعات کوره فولاد)، دو نسبت آب به سیمان (4/0و 5/0)، نسبت ثابت ماسه به سیمان (75/2) و شش درصد جایگزینی مختلف سنگدانه ضایعاتی (۰%، 10%، 20%، 30%، 40% و ۵۰%) تهیه و مورد آزمایش قرار گرفتند. نتایج نشان داد که مقاومت خمشی و فشاری با تخلخل رابطه‌ای معکوس و با سرعت امواج التراسونیک رابطه‌ای مستقیم دارند. همچنین رابطه میان تخلخل و سرعت امواج، غیرخطی و نمایی است. در شرایط نسبت آب به سیمان کمتر و رده مقاومتی بالاتر، مقدار مقاومت خمشی به مقاومت فشاری نزدیک‌تر است. همچنین، بیشترین کاهش مقاومت در نمونه‌هایی با ۵۰ درصد جایگزینی سنگدانه ضایعاتی مشاهده شد. یافته‌های این تحقیق می‌تواند در طراحی مخلوط‌های سیمانی سازگار با محیط زیست و ارزیابی سریع و غیرمخرب عملکرد مکانیکی آن‌ها نقش بسزایی ایفا کند.
کلیدواژه‌ها
ملات پایه سیمانی
سنگدانه ضایعاتی کوره فولاد
مقاومت خمشی
تخلخل
سرعت موج التراسونیک
مقاومت فشاری

موضوعات

عنوان مقاله English

Experimental investigation of Porosity and Ultrasonic wave velocity impacts on the Mechanical Strengths of Cement-based Mortars containing Waste Foundry Sand

نویسندگان English

Sahar Mahdinia 1
Mohammadreza Tavakkolizadeh 2
Amir R. Masoodi 2
1 PhD candidate, Department of Civil Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
2 Assistant Professor, Department of Civil Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
چکیده English

The use of recycled materials in construction has recently gained prominence as a strategy for promoting sustainability and reducing environmental impact. In this context, understanding the mechanical behavior of mortars incorporating waste aggregates and assessing their properties through non-destructive methods is essential for optimized mix design. This study investigates the relationship between flexural and compressive strengths with porosity and ultrasonic pulse velocity (UPV) at 28 days of curing. A total of 180 mortar specimens were prepared from 36 mix designs using three cement grades (32.5, 42.5, and 52.5 MPa), two types of aggregates (natural and waste foundry sand—WFS), two water-to-cement ratios (0.4 and 0.5), a constant sand-to-cement ratio (2.75), and six WFS replacement levels (0%, 10%, 20%, 30%, 40% and 50% by weight). Results indicated inverse relationships between strengths and porosity: higher strength specimens had lower porosity. A direct relationship was observed between mechanical strengths and UPV, implying that higher strength corresponds to greater internal cohesion and faster wave transmission. The porosity–UPV relationship was found to be exponential and nonlinear. Moreover, flexural and compressive strengths were more closely aligned at lower water-to-cement ratios and higher cement grades. The lowest strength values consistently occurred at the 50% WFS replacement level. These findings offer valuable insights for designing eco-friendly mortars and enabling rapid, non-destructive performance evaluation.

کلیدواژه‌ها English

Cement-based mortar
Waste foundry sand (WFS)
Flexural strength
Porosity
Ultrasonic pulse velocity
Compressive strength
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  • تاریخ دریافت 20 اردیبهشت 1404
  • تاریخ بازنگری 02 مرداد 1404
  • تاریخ پذیرش 09 شهریور 1404