تأثیر مصالح سنگی آلوده به آلاینده‌های آلی از منظر ریزساختار بر پارامتر‌های مقاومتی و دوام بتن

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشیار، دانشکده فنی، دانشگاه هرمزگان.

2 2. دانشجوی کارشناسی ارشد، مهندسی عمران، دانشگاه هرمزگان

10.22124/jcr.2023.24670.1622

چکیده

فعالیت در بخش‌های مختلف صنایع پتروشیمی و پالایشگاه‌ها، طیف گسترده‌ای از آلودگی‌های آلی را به محیط‌زیست وارد کرده است. امروزه آلودگی مصالح سنگی در اثر نشت نفت خام یا فرآورده‌های نفتی به‌طور عمدی یا سهوی افزایش‌یافته است و به‌عنوان یک نگرانی زیست‌محیطی بزرگ در سراسر جهان شناخته‌شده است. از سوی دیگر در بسیاری از پروژه‌های عمرانی و ژئوتکنیکی نیاز به تثبیت مصالح سنگی آلوده به مواد آلی توسط سیمان است. در این مقاله، تأثیر مصالح سنگی آلوده به نفت خام و گازوئیل بر فرآیند هیدراتاسیون سیمان، از منظر ریزساختاری و ویژگی‌های مکانیکی بررسی‌شده است. در این پژوهش حدود 90 نمونه بتنی حاوی مصالح سنگی آلوده ساخته و ارزیابی‌شده است. نمونه‌ها به مدت 6 ماه در حوضچه آب شرب نگهداری شدند و آزمایش‌های مقاومت فشاری و درصد جذب آب در سنین 1، 3، 7، 28، 90 و 180 روز روی آزمونه‌ها انجام شده است. برای بررسی ریزساختاری از آزمایش تصاویر میکروسکوپ الکترونیکی روبشی (SEM) و برای تجزیه‌وتحلیل ساختاری از آزمایش طیف‌سنجی پراش انرژی پرتوایکس (EDX) استفاده‌شده است. همچنین آزمایش پراش پرتوایکس (XRD) برای بررسی تشکیل محصولات هیدراتاسیون، تأثیر آلاینده‌های آلی بر فرآیند هیدراتاسیون و محصولات هیدراتاسیون و آنالیز ساختار بلورین مواد انجام‌شده است. بر اساس نتایج حاصل‌شده مقاومت فشاری نمونه حاوی مصالح سنگی آلوده به نفت خام و گازوئیل بعد از گذشت 90 روز نسبت به نمونه شاهد به ترتیب حدود 47٪ و 31٪ کاهش یافته است و مقاومت فشاری نمونه از MPa 36 به MPa 19 و MPa 25 رسیده است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

The Effect of Organic Contaminants on the Microstructure-Based Mechanical and Durability Parameters of Concrete Containing Polluted Aggregate Materials

نویسندگان [English]

  • mohammad amiri 1
  • Hadis Karimi 2
1 Associate Professor, University of Hormozgan, Faculty of Engineering, Bandar Abbas, Iran
2 Master Student, University of Hormozgan, Faculty of Engineering, Bandar Abbas, Iran.
چکیده [English]

Industrial activities, particularly in petrochemical and refinery sectors, have introduced a wide range of organic pollutants into the environment, leading to the pollution of aggregate materials with crude oil or petroleum products. This study investigates the influence of aggregate materials contaminated with crude oil and diesel on the cement hydration process and concrete properties. Around 90 concrete samples with polluted aggregates were evaluated over a 6-month period. Compressive strength tests and water absorption percentage tests were conducted at different ages. Microstructural analysis through SEM, structural analysis via EDX, and XRD analysis for hydration product characterization were performed. Results showed a significant reduction in compressive strength (47% and 31%) for samples contaminated with crude oil and diesel, respectively, compared to the control. Water absorption and permeability increased in polluted samples. SEM, and XRD, results indicated increased ettringite production, decreased nanostructure C-S-H, reduced strength and durability, and increased water absorption and permeability in the concrete. This study highlights the detrimental effects of organic contaminants on concrete properties, emphasizing the need for pollution management in aggregate materials for sustainable construction practices.

کلیدواژه‌ها [English]

  • Polluted aggregate materials
  • organic contaminants
  • C-S-H
  • SEM
  • XRD
  • crude oil
  • diesel

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