ارزیابی آزمایشگاهی خصوصیات مکانیکی روسازی بتن غلتکی با استفاده از روش سطح پاسخ

عرب‌یارمحمدی, حسین; شربتدار, محمد کاظم; نادرپور, حسین

doi:10.22075/jtie.2021.23803.1540

ارزیابی آزمایشگاهی خصوصیات مکانیکی روسازی بتن غلتکی با استفاده از روش سطح پاسخ

نوع مقاله : مقاله پژوهشی

نویسندگان

¹ دانشجوی دکتری عمران، دانشکده مهندسی عمران، واحد ساری، دانشگاه آزاد اسلامی، ساری، ایران

² استاد، دانشکده مهندسی عمران، دانشگاه سمنان

10.22075/jtie.2021.23803.1540

چکیده

بتن غلتکی نوعی بتن خشک با اسلامپ صفر است که دارای دو کاربرد اصلی مختلف در سدسازی و روسازی است. با توجه به مزایایی مانند بهره‌وری هزینه، گرمای هیدراتاسیون کم، دوام و سرعت زیاد اجرا، این بتن به ویژه در ساخت باند فرودگاه‌ها، سایت‌های نظامی و نیروگاه‌های هسته‌ای ترجیح داده می‌شود. در این مقاله، چگونگی تأثیر مقدار سیمان، نسبت آب به سیمان (W/C) و نسبت ریزدانه به کل سنگدانه (S/A) بر مشخصات مکانیکی بتن غلتکی روسازی بررسی شده است. نتایج از طریق آزمایش‌های تجربی و تجزیه و تحلیل روش سطح پاسخ (RSM) به‏دست آمد. بدین منظور، دو مقدار سیمان، سه نسبت آب به سیمان و سه نسبت ریزدانه به کل سنگدانه در نظر گرفته ‌شد و تأثیر این پارامترها بر کارایی، مدول الاستیسیته و مقاومت‌های فشاری، خمشی و کششی مورد بررسی قرار‌ گرفت. نتایج نشان داد که مؤثرترین راه برای افزایش کارایی (کاهش زمان وی بی)، افزایش نسبت آب به سیمان است. همچنین، مقدار سیمان و نسبت آب به سیمان رابطه‌ی معکوس با زمان وی بی داشتند. در‌ حالی ‌که نسبت ریزدانه به کل سنگدانه به طور مستقیم بر آن تأثیر می‌گذارد. مقدار سیمان بیشترین تأثیر را در مقاومت فشاری داشت و افزایش نسبت آب به سیمان نیز به دلیل افزایش میزان تراکم‌پذیری باعت افزایش مقاومت فشاری گردید. بر مبنای نتایج، مشخص گردید که مدول الاستیسیته تابعی از میزان مصالح سنگی درشت‌دانه است. از دیگر نتایج، تأثیر مقدار سیمان و اولین مقاومت در برابر ترک‌خوردگی خمیرسیمان بر مقاومت خمشی بود. در حالی ‌که در مقاومت کششی، نسبت ریزدانه به کل سنگدانه بیشترین تأثیر را داشت.

کلیدواژه‌ها

موضوعات

روسازی

عنوان مقاله [English]

Mechanical Properties Evaluation of Roller Compacted Concrete Pavement Using Response Surface Methodology in Terms of an Experimental Program

نویسندگان [English]

Hosein Arabyarmohammadi ¹
M. Kazem Sharbatdar ²
Hosein Naderpour ²

¹ Department of Civil Engineering, Sari Branch, Islamic Azad University, Sari, Iran

² Professor, Faculty of Civil Engineering, Semnan University

چکیده [English]

Roller-Compacted Concrete (RCC) is a kind of dry consistency concrete with zero slump, with two various main applications for dams and pavements. Owing to the benefits such as cost efficiency, low hydration heat, durability, and high speed of execution, RCC is particularly preferred in the construction of airstrips, military sites, and nuclear plants projects. The effects of cement content, the water to cement (W/C) ratio, and the sand to aggregate (S/A) ratio were investigated on Roller-Compacted Concrete Pavement (RCCP) mechanical properties in this paper. Results were obtained through experimental tests and response surface methodology (RSM) analysis. Two cement content, three W/C ratios, and three S/A ratios were implemented, and their effects on Vebe time, modulus of elasticity, and compressive, flexural, and tensile strengths were evaluated. It was found that the most efficient way to decrease the Vebe time was to increase the W/C ratio. The cement content and W/C ratio had an inverse relationship with the Vebe time, while the S/A ratio influences the Vebe time directly. The cement content had the greatest impact on compressive strength and compressive strength increased when the W/C ratio increased due to greater compact-ability. Results indicated that the modulus of elasticity was a function of coarse aggregate content. The flexural strength was governed by cement content and the first cracking strength of paste. However, in the splitting test, it was the S/A ratio had the maximum effect.

کلیدواژه‌ها [English]

Vebe time"
Roller-Compacted Concrete"
Pavement"
Mechanical Properties"
"
Response Surface Methodology"

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