اثر عمل‌آوری بتن در محیط حاوی آلاینده نفت خام بر پارامترهای ریزساختاری و درشت‌ساختاری بتن

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشیار، دانشکده فنی، دانشگاه هرمزگان.

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

10.22124/jcr.2024.25976.1633

چکیده

حضور گسترده صنایع پتروشیمی و پالایشگاه‌های نفتی در غرب استان هرمزگان، موجب شده بسیاری از سازه‌های بتنی در مجاورت آلاینده‌های آلی قرار گیرند، این مجاورت می‌تواند بر پارامتر‌های مقاومتی و دوام بتن تأثیرگذار باشد. بر این اساس هدف این مقاله تأثیر عمل-آوری و مجاورت کوتاه مدت و بلند مدت بتن در محیط‌های حاوی آلاینده‌ آلی نفت خام و تأثیر آن بر دوام و مقاومت بتن از منظر ریزساختاری است. در این پژوهش حدود 360 نمونه بتنی ارزیابی شده است. نمونه‌ها به مدت 12 ماه در امولسیون‌های حاوی 5/0، 1، 5/1، 5/2، 5، 10، 25، 50 و 100 درصد نفت خام عمل‌آوری شده و آزمایش‌ مقاومت فشاری در سنین 1، 3، 7، 28، 90 و 365 روز روی نمونه‌ها انجام شد، همچنین تغییرات ضریب نفوذپدیری نیز بررسی شده‌است. 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، در محیط‌های آلوده به نفت خام و آنالیز ساختار بلورین مواد انجام‌شده است. بر اساس نتایج حاصل شده، مقاومت نمونه‌های عمل‌آوری شده در امولسیون‌های نفت خام نسبت به نمونه شاهد وابسته به میزان غلظت امولسیون است. مقاومت فشاری نمونه‌های عمل‌آوری شده در امولسیون با غلظت 100٪ نفت خام بعد از گذشت 365 روز نسبت به نمونه شاهد حدود 41٪ کاهش‌یافته است و مقاومت فشاری نمونه از MPa 41 به MPa 24 و ضریب نفوذپذیری نمونه از cm/h 7-10*2/3 به cm/h 7-10*3/15 رسیده است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

The Impact of Concrete Curing in Environments Contaminated with Crude Oil on Microstructural and Macrostructural Parameters of Concrete

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]

The proliferation of petrochemical industries and oil refineries in the western region of Hormozgan province has led to the placement of numerous concrete structures in close proximity to organic pollutants. This proximity has the potential to significantly influence the resistance parameters and durability of concrete. Therefore, the primary objective of this article is to investigate the short-term and long-term effects of exposure to organic pollutants from crude oil on the microstructural properties and strength of concrete. This research entailed the evaluation of approximately 360 concrete samples. These samples underwent a 12-month curing process in emulsions containing varying concentrations of crude oil (0.5%, 1%, 1.5%, 2.5%, 5%, 10%, 25%, 50%, and 100%). Compressive strength tests were conducted at intervals of 1, 3, 7, 28, 90, and 365 days, with concurrent analysis of changes in permeability coefficient. Microstructural examination was carried out using Scanning Electron Microscope (SEM) images, while structural analysis was performed using EDX. Additionally, X-ray Diffraction (XRD) tests were conducted to study the formation of hydration products in environments contaminated with crude oil and to analyze the crystalline structure of the materials. The results reveal that the resistance of concrete samples cured in crude oil emulsions depends on the concentration of the emulsion. Notably, the compressive strength of samples cured in 100% crude oil concentration emulsion decreased by approximately 41% after 365 days when compared to the control sample. Specifically, the compressive strength dropped from 41 MPa to 24 MPa, while the permeability coefficient increased from 3.2*10-7cm/h to 15.3*10-7cm/h.

کلیدواژه‌ها [English]

  • Microstructure
  • XRD
  • SEM
  • C-S-H
  • Crude oil

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