اثر زئولیت بر مقاومت فشاری و خصوصیات دوام بتن غلتکی حجیم

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی عمران، دانشگاه تهران، تهران، ایران

چکیده

بتن غلتکی کم ‌سیمان یکی از انواع بتن‌های خاص است که به جهت کاهش حدود 2 برابری حرارت ناشی از واکنش هیدراته شدن، مقدار سیمان در نسبت مخلوط آن کم است. این موضوع باعث افزایش قابل توجه نفوذپذیری بتن غلتکی نسبت به بتن معمولی می‌شود. افزایش نفوذپذیری نیز ورود یون‌های مخرب (نظیر یون‌های کلراید، سدیم، پتاسیم و کلسیم) به بدنه بتنی سازه‌های حجیم را موجب می‌شود و در نهایت عدم پایداری این سازه‌ها را به دنبال دارد. پوزولان‌ها مانند زئولیت می‌توانند نفوذپذیری را کاهش دهند، از این رو در تحقیق حاضر، تأثیر جایگزینی بخشی از سیمان با زئولیت بر مقاومت فشاری و خصوصیات دوام نظیر نفوذ تسریع شده یون کلراید، عمق نفوذ آب، جذب آب، مقاومت الکتریکی و سرعت پالس اولتراسونیک بتن غلتکی بررسی شده است. ابتدا آنالیز شیمیایی و واکنش پوزولانی زئولیت بررسی شدند. سپس به منظور ارزیابی تأثیر زئولیت بر خواص بتن، نمونه‌های بتن غلتکی در چهار نسبت مخلوط با درصدهای جایگزینی %0، %15، %30 و 40% سیمان با زئولیت ساخته شدند و تحت آزمایش‌های مقاومت فشاری، عمق نفوذ آب، جذب آب، نفوذ تسریع شده یون کلراید (RCPT)، مقاومت الکتریکی، سرعت پالس اولتراسونیک (UPV) قرار گرفتند. کارایی مخلوط‌های بتن غلتکی نیز از طریق آزمایش میز وی بی تعیین شد. نتایج نشان دادند که بر طبق آزمایش‌های RCPT، عمق نفوذ آب و مقاومت الکتریکی، جایگزینی 15% وزن سیمان با زئولیت باعث کاهش نفوذپذیری و بهبود چشمگیر خصوصیات دوامی می‌شود. همچنین افزایش درصد زئولیت، مقاومت فشاری نمونه‌ها را کاهش می‌دهد. مقایسه با تعداد 96 نمونه مکعبی 15 سانتی‌متری صورت گرفته است. بر اساس نتایج مقاومت فشاری 7 روزه، جایگزینی سیمان با 15%، 30% و 40% زئولیت به ترتیب باعث کاهش 45/7%، 56% و 61/7% مقاومت فشاری نسبت به نمونه شاهد شده است. این مقادیر کاهش برای مقاومت فشاری 28 روزه به ترتیب 24/7%، 39/5% و 51/6%، برای نتایج 56 روزه به ترتیب 27%، 3/34% و 46/1% و برای نتایج 91 روزه نیز، به ترتیب 21/2%، 35/3% و 45/3% می‌باشد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Effect of Zeolite on the Compressive Strength and Durability Properties of Roller-Compacted Mass Concrete

نویسندگان [English]

  • ali sarafi
  • Seyed Mehdi Zahrai
  • Amir mohammad Ramezanianpour
Department of Civil Engineering, Faculty of Civil Engineering, Faculty of Engineering, University of Tehran, Tehran, Iran.
چکیده [English]

Roller Compacted Mass Concrete is one of the special types of concrete that has a low amount of cement in its mixture proportion in order to reduce the heat caused by the hydration reaction. This increases the permeability of roller-compacted concrete compared to conventional concrete. The increase in permeability also leads to the entry of destructive ions into the concrete of mass structures and ultimately the instability of these structures. Supplementary cementitious materials such as zeolite can reduce permeability, so in this research, the effect of replacing a part of cement with zeolite on the durability and mechanical properties of roller-compacted concrete has been investigated. First, chemical analysis and the pozzolanic activity of zeolite were investigated. Then, in order to evaluate the effect of zeolite on the properties of concrete, roller-compacted concrete specimens were made in four mixture proportions with replacement percentages of 0%, 15%, 30% and 40% of cement with zeolite and subjected to compressive strength, water penetration depth, water absorption, Rapid Chloride Permeability Test (RCPT), electrical resistivity, Ultrasonic Pulse Velocity (UPV). The workability of the roller-compacted concrete mixtures was also determined by the V.B. time test. The results showed that according to RCPT, water penetration depth and electrical resistivity tests, replacing 15% of cement weight with zeolite reduces permeability and significantly improves the durability properties of roller-compacted concrete. Also, increasing the percentage of zeolite reduces the compressive strength of the specimens.

کلیدواژه‌ها [English]

  • Zeolite
  • Roller-Compacted Concrete (RCC)
  • Durability Properties
  • Mechanical Properties
  • Workability

مراجع

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نشریه مهندسی عمران امیرکبیر
دوره 55، شماره 3
خرداد 1402
صفحه 641-664

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