بررسی آزمایشگاهی تاثیر درجه حرارت‌های بالا بر خصوصیات مکانیکی و جذب انرژی بتن مبتنی بر سیمان کلسیم آلومینات مسلح شده با الیاف ترکیبی

کردی, سعید; امیدی نسب, فریدون; دهستانی, مهدی

doi:10.22065/jsce.2020.172995.1790

بررسی آزمایشگاهی تاثیر درجه حرارت‌های بالا بر خصوصیات مکانیکی و جذب انرژی بتن مبتنی بر سیمان کلسیم آلومینات مسلح شده با الیاف ترکیبی

نوع مقاله : علمی - پژوهشی

نویسندگان

¹ گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه لرستان، ایران

² گروه عمران - دانشکده فنی و مهندسی - دانشگاه لرستان - خرم آباد - ایران

³ دانشیار/دانشگاه صنعتی نوشیروانی بابل

10.22065/jsce.2020.172995.1790

چکیده

سازه‌ها ضمن اینکه به عنوان یکی از اصلی‌ترین منابع و سرمایه‌های هر کشور محسوب می‌شوند، به دلیل استفاده طولانی مدت و مداوم، و ضرورت حفظ جان انسان‌ها باید همواره پایداری و ایمنی کافی را دارا باشند. بر این اساس چگونگی رفتار بتن در معرض درجه حرات‌های بالا از اهمیت بالایی برخوردار است. استفاده از سیمان‌های با آلومین بالا به دلیل ضعف قابل توجه سیمان‌های معمولی در دماهای بالاتر از 300 درجه سلسیوس، مورد توجه محققین قرار گرفته است. در این مطالعه ضمن استفاده از سیمان کلسیم آلومینات IRC40 به جای سیمان معمولی، از ترکیب دو نوع الیاف فولادی و الیاف پلی‌پروپیلن، در ساخت بتن استفاده شده است. هدف از این پژوهش ارزیابی اثر درجه حرارت‌های بالا بر خصوصیات مکانیکی بتن ساخته شده از سیمان کلسیم آلومینات، و محاسبه جذب انرژی نمونه‌های بتنی پس از قراردهی آن‌ها در مجاورت دماهای 600،110 و 800 درجه سلسیوس می‌باشد. در همین راستا از 4 طرح اختلاط بر مبنای استفاده از چهار سطح الیاف ترکیبی به مقدار 0، 0.5، 1و 1.5 درصد برای ساخت مجموعا ً108 نمونه، شامل نمونه‌‌های فشاری مکعبی 10×10×10سانتی‌متر، نمونه‌های کششی استوانه‌ای با قطر 10 و ارتفاع 20 سانتی‌متر و تیر‌های خمشی با ابعاد 6×8×32 سانتی‌متر استفاده شد. مطابق با نتایج آزمایشگاهی مشاهده شد که استفاده از 1.5 درصد الیاف ترکیبی موجب افزایش قابل ملاحظه مقادیر خصوصیات مکانیکی شامل مقاومت فشاری، مقاومت کششی و مقاومت خمشی و همچنین ارتقاء سطح جذب انرژی می‌گردد.

کلیدواژه‌ها

موضوعات

مهندسی سازه و آتش

عنوان مقاله [English]

Laboratory study of the effect of high temperatures on mechanical properties and energy absorption of concrete based calcium aluminate reinforced with hybrid fiber

نویسندگان [English]

saeed kordi ¹
Fereydoon Omidinasab ²
mehdi dehestani ³

¹ lorestan university, iran

² civil, engineering, lorestan university, khorramabad, iran

³ Civil Engineering, Babol Noshirvani University of Technology, Babol, Iran

چکیده [English]

Structures are considered as one of the main sources and resources of each country, due to their long-term and continuous use and the need to preserve human lives; they must always have sufficient stability and safety. Accordingly, the behavior of concrete is subject to the high degree of temperature is very important. The use of high-alumina cement has attracted the attention of researchers because of the considerable weakness of conventional cements at temperatures above 300 ° C. In this study, using the cement of IRC40 Calcium Aluminate instead of conventional cement, the combination of two types of steel fibers and polypropylene fibers was used in the manufacture of concrete. The purpose of this study was to evaluate the effect of high temperatures on the mechanical properties of Calcium Aluminate cement concrete and calculate the energy absorption of concrete samples after depositing them in the vicinity of 600,110 and 800 degrees Celsius. In the same way, four mix composition based on the use of four levels of 0, 0.5, 1, and 1.5% hybrid fibers were used to make a total of 108 samples, including cube compressive specimens of 10 × 10 × 10 cm, cylindrical tensile specimens with a diameter of 10 and a height of 20 cm and flexural beams with dimensions of 6 × 8 × 32 cm. According to laboratory results, the use of 1.5% of the hybrid fiber increased the amount of mechanical properties, including compressive strength, tensile strength and flexural strength, as well as increased energy absorption.

کلیدواژه‌ها [English]

Concrete
Calcium Aluminate Cement
High temperature
Mechanical properties
Steel fibers
Polypropylene fibers

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