بررسی تاثیرات مثبت ولاستونیت و میکروسیلیس بر خواص مکانیکی و نفوذپذیری بتن کامپوزیتی در محلیط معمولی و سولفاته

نوع مقاله : مقاله پژوهشی

نویسندگان

1 عضو هیات علمی- استاد دانشگاه محقق اردبیلی- گروه عمران

2 کارشناسی ارشد گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه محقق اردبیلی، اردبیل، ایران

10.22124/jcr.2025.30973.1707

چکیده

در این پژوهش اثرات هم‌افزایی ولاستونیت و میکروسیلیس به‌عنوان جایگزین جزئی سیمان بر خواص مکانیکی و نفوذپذیری در دو محیط معمولی و سولفاته (با غلظت‌های %5 و %10 سولفات منیزیم) ارزیابی شد. در مجموع، ۲۸۸ نمونه مکعبی ساخته شد و در سنین ۲۸ و ۹۰ روزه، آزمایش‌های مقاومت فشاری، نفوذپذیری، مدول الاستیسیته دینامیکی و جذب آب انجام شد. ولاستونیت در مقادیر ۷٫۵، ۱۵ و ۲۰ و میکروسیلیس در مقادیر۴ و ۷ درصد جایگزین سیمان شد. نتایج نشان داد که ترکیب %7 میکروسیلیس و %20 ولاستونیت بیشترین کاهش نفوذپذیری (تا %46/63) و جذب آب (تا %39/13) را به ‌ویژه در محیط‌های خورنده سولفاته ایجاد کرد. همچنین، مخلوط‌های حاوی %5/7 ولاستونیت و %7 میکروسیلیس بهبود قابل‌توجهی در مقاومت فشاری نشان داد که تا %18/17 افزایش داشت. تحلیل رگرسیون خطی نیز همبستگی قوی بین نفوذپذیری، جذب آب و مقاومت فشاری را در تمامی محیط‌ها نشان داد (R² > 0.90). همچنین فرآیندهای تولید ساده‌ ولاستونیت، آن را تبدیل به ماده همسو با زیست محیط کرده است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigating the positive effects of wollastonite and micro-silica on the mechanical properties and permeability of composite concrete in normal and sulfated environment

نویسندگان [English]

  • Yaghoub Mohammadi 1
  • Sattar Shafiei 2
1 Professor, Civil Engineering Department, University of Mohaghegh Ardabili
2 M.Sc, Department of Civil - Structural Engineering, University of Mohaghegh Ardabili
چکیده [English]

This research investigates the combined effects of wollastonite and micro-silica as partial cement replacements on the mechanical properties and durability performance of composite concrete under both standard curing and corrosive environment (sulfate exposure) conditions (5% and 10% MgSO₄ solutions). A total of 288 concrete cube specimens were cast and tested for compressive strength, water permeability, dynamic modulus of elasticity, and water absorption at 28 and 90 days. Wollastonite was incorporated at replacement levels of 7.5%, 15%, and 20%, while microsilica was added at 4% and 7%. The results revealed that the mixture containing 20% wollastonite and 7% micro-silica exhibited the highest reduction in water permeability (up to 63.46%) and water absorption (up to 13.39%), particularly in sulfate-rich environments. Furthermore, mixtures with 7.5% wollastonite and 7% microsilica showed a notable improvement in compressive strength, with increases of up to 17.18% under 5% sulfate exposure. Regression analysis indicated strong correlations between compressive strength, water absorption, and permeability across all curing conditions (R² > 0.90). These findings suggest that the use of wollastonite, particularly in combination with microsilica, can significantly enhance the mechanical performance and durability of concrete, while also offering environmental and economic benefits due to its natural availability, low energy processing, and potential synthesis from industrial waste materials. Also, wollastonite's simple production processes have made it an environmentally friendly material.

کلیدواژه‌ها [English]

  • Wollastonite
  • Micro-silica
  • Concrete Durability
  • Sulfate Attack
  • Permeability
  • Compressive Strength

مراجع

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