تأثیر الیاف پلی پروپیلن در مقابل ماکرو بارچیپ بر مشخصات بتن پلاستیک

نوع مقاله : مقاله پژوهشی

نویسندگان

• سید حسین قاسم زاده موسوی نژاد
• آرین درویشعلی نژاد
• مسعود صابر بازکیاگورابی

گروه مهندسی عمران، دانشکدۀ فنی، دانشگاه گیلان، رشت، ایران.

10.22067/jfcei.2024.80952.1215

چکیده

بتن پلاستیکی به طور گسترده در ساخت دیوارهای بریده سدهای خاکی استفاده می شود. خواص مکانیکی و رفتار مصالح به کار رفته در ساخت چنین دیوارهایی به دلیل بارهای وارده بر پی و ضد آب بودن دیوار از اهمیّت ویژه ای برخوردار است. انرژی شکست مهم ترین عامل تأثیرگذار در توصیف رفتار شکست در نظر گرفته می شود که در واقع مکانیسم ترک خوردگی بتن را توصیف می کند. این تحقیق با هدف بررسی اثر افزودن الیاف پلی پروپیلن 12 میلی متری و الیاف ماکروبارچیپ 30 میلی متری برای بتن پلاستیکی تقویت‌کننده دیوارهای بریده انجام شده است. خواص مورد مطالعه عبارتند از: آزمایش تعیین اسلامپ مخلوط بتن، آزمایش اولتراسونیک بتن، مدول الاستیسیته، منحنی تنش-کرنش، نفوذپذیری بتن، میکروسکوپ الکترونی روبشی (SEM) و مقاومت فشاری در سن 28 روزه. نتایج به دست‌آمده از مخلوط های بتن تازه نشان می دهد که وزن مخصوص و اسلامپ برای هر دو نوع الیاف کاهش می یابد. بیشترین کاهش در الیاف پلی پروپیلن52.27% بود. نتایج آزمایش اولتراسونیک نشان دهندۀ کاهش 9.47% سرعت موج برای الیاف پلی پروپیلن و 14.17% برای الیاف های ماکرو است. بر اساس نتایج مقاومت فشاری 28 روزه، افزودن الیاف باعث کاهش مقاومت فشاری شده است. بیش ترین مقدار برای الیاف پلی پروپیلن 27.20% و برای الیاف ماکروبارچیپ 23.32% بود. با توجه به نتایج مدول الاستیسیته، افزودن الیاف این ویژگی بتن پلاستیک را کاهش می دهد به طوری که بالاترین مقدار برای الیاف پلی پروپیلن 16.98% و برای الیاف ماکروبارچیپ 24.70% است.

کلیدواژه‌ها

• الیاف پلی‌پروپیلن
• الیاف ماکرو
• بتن پلاستیک
• نفوذپذیری
• سرعت امواج فرا صوت

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عنوان مقاله [English]

Effect of Polypropylene Fibers versus Macrobarchip on the Characteristics of Plastic Concrete

نویسندگان [English]

• Seyed Hosein Ghasemzadeh Mousavinejad
• Arian Darvishalinezhad
• Masoud Saber BazKiagourabi,

Department of Civil Engineering, Faculty of Engineering, University of Guilan, Rasht, Iran.

چکیده [English]

Plastic concrete is widely used in the construction of cut-off walls of earth dams. The mechanical properties and behavior of the materials used in the construction of such walls are of particular importance due to the loads on the foundation and the waterproofness of wall. Fracture energy is considered to be the most important influencing factor in the description of fracture behavior, which actually describes the cracking mechanism of concrete. This research aims to study the effect of adding 12 mm polypropylene fibers and 30 mm macrobarchip fibers to reinforce plastic concrete of cut-off walls. The studied properties include: concrete mix slump determination test, concrete ultrasonic test, modulus of elasticity, stress-strain curve, concrete permeability, scanning electron microscope (SEM) and compressive strength at the age of 28 days. The results obtained from fresh concrete mixtures show that the specific weight and slump are reduced for both types of fibers. The highest decrease in PP fibers was 52.27%. The results of the ultrasonic test indicate a 9.47% decrease in wave speed for PP fibers and 14.17% for macro fibers. Based on the 28 day compressive strength results, the addition of fibers have reduced the compressive strength as much as 27.20% for PP fibers and 23.32% for macro fibers. According to the results of the modulus of elasticity, adding fibers reduces this characteristic of plastic concrete. such that the highest value for PP fibers is 16.98% and 24.70% for macro fibers.

کلیدواژه‌ها [English]

• Polypropylene Fibers
• Macro Fibers
• Plastic Concrete
• Permeability
• Ultrasonic Wave Velocity

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