بررسی عملکرد بتن توانمند حاوی پوزولان در برابر حمله سولفوریک اسید

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی عمران و محیط زیست، دانشگاه صنعتی امیرکبیر، تهران، ایران

2 دانشکده مهندسی عمران، دانشگاه تهران، تهران، ایران

چکیده

بتن به عنوان پرمصرف ترین مصالح ساختمانی، ماهیتی قلیایی و آسیب پذیر در برابر حمله مواد شیمیایی اسیدی دارد. از این رو بررسی عوامل تأثیر گذار بر حمله انواع اسیدها به بتن های با شرایط ساختاری متفاوت، از اهمیت بسزایی برخوردار است. لذا در این تحقیق بتن هایی با دو نسبت آب به مواد سیمانی برابر با 0/32 (تحت عنوان بتن های توانمند) و 0/4 (تحت عنوان بتن های معمولی) توسط سیمان پرتلند و با جایگزینی سرباره کوره آهن گدازی و پوزولان طبیعی تهیه شده و عملکرد این بتن ها در محیط حاوی سولفوریک اسید با pH برابر با 1 مقایسه شده است. در این راستا آزمایش های مقاومت فشاری،اندازه گیری سرعت امواج التراسونیک، مقاومت الکتریکی سطحی و جذب آب موئینه جهت ارزیابی کیفیت بتن از لحاظ مشخصات مکانیکی و نفوذپذیری و آزمایش های کاهش وزن، افت مقاومت فشاری، تغییر طول نمونه های ملات و تغییر سرعت امواج اولتراسونیک به منظور بررسی عملکرد نمونه های بتنی در برابر حمله سولفوریک اسید در نظر گرفته شده اند. نتایج کلی حاکی از بهبود عملکرد بتن های حاوی مواد جایگزین سیمان با افزایش مقدار جایگزینی این مواد به جای سیمان می باشد. همچنین، بتن های توانمند علی رغم نفوذپذیری کمتر، در برابر حمله سولفوریک اسید آسیب پذیرتر از بتن های معمولی هستند. ضمناً روش اندازه گیری تغییرات سرعت امواج التراسونیک جهت ارزیابی خرابی ناشی از حمله سولفوریک اسید نیز همراه با خطای زیاد بوده و استفاده از این آزمایش برای بررسی شدت خوردگی نمونه های بتنی توصیه نمی شود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Assessment of High Performance Concrete Containing Mineral Admixtures Under Sulfuric Acid Attack

نویسندگان [English]

  • A. A. Ramezanianpour 1
  • A. Zolfagharnasab 1
  • F. Bahmanzadeh 1
  • A. M. Ramezanianpour 2
1 Civil and Environmental Engineering Department, AmirKabir University of Technology, Tehran, Iran
2 Civil Engineering Department, University of Tehran, Tehran, Iran
چکیده [English]

Concrete, as a main construction material has an alkali nature which makes it vulnerable to attack by acidic solutions. Therefore, investigations on performance of various types of concretes against different kinds of acid attacks are essential to achieve durable concretes in severe environments. Considering the significant effect of durability in sustainability of concrete structures, high performance concrete (HPC) which is characterized by its high compressive strength, low permeability and fine durability in many severe environments, is increasingly utilized in civil and infrastructural constructions. This paper presents an experimental study on durability of HPC and conventional concrete (CC) containing ordinary Portland cement (PC), ground granulated blast furnace slag (GGBFS) and natural pozzolan (NP) under sulfuric acid attack. Compressive strength, ultra-sonic pulse velocity determination, capillary water absorption test and evaluation of electrical resistivity were utilized to investigate mechanical properties and permeability of hardened concrete. The durability properties were studied through measurement of weight and compressive strength loss, ultra-sonic pulse velocity variations and length change of mortar prisms exposed to sulfuric acid. The results indicated that concretes containing less cementitious materials and mineral admixtures were more durable in acidic solutions, and incorporating higher volume of GGBFS and NP could improve performance of concrete against sulfuric acid attack.

کلیدواژه‌ها [English]

  • High Performance Concrete (HPC)
  • Sulfuric Acid Attack
  • Concrete durability
  • Concrete Permeability
  • Supplementary Cementing Materials

مراجع

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نشریه مهندسی عمران امیرکبیر
دوره 50، شماره 1
فروردین و اردیبهشت 1397
صفحه 121-138

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