ارزیابی خواص مکانیکی و دوامی بتن های حاوی خاکستر لجن فاضلاب ( SSA ) به عنوان جایگزین سیمان و یا ریزدانه

نیک منش, امیرمهدی; رمضانیان پور, امیرمحمد; شکرچی زاده, محمد

doi:10.30478/jcsm.2023.404095.1335

ارزیابی خواص مکانیکی و دوامی بتن های حاوی خاکستر لجن فاضلاب ( SSA ) به عنوان جایگزین سیمان و یا ریزدانه

نوع مقاله : مقاله پژوهشی

نویسندگان

¹ کارشناسی ارشد مهندسی عمران، گرایش سازه، دانشگاه تهران

² دانشیار دانشکده مهندسی عمران، دانشگاه تهران

³ استاد دانشکده مهندسی عمران، دانشگاه تهران

10.30478/jcsm.2023.404095.1335

چکیده

با توسعه جامعه بشری و افزایش تعداد تصفیه خانه ها، تصفیه و دفع لجن آن هم در حجم زیاد، نیاز به یک مدیریت کارامد دارد. امروزه به دلیل کمبود زمین برای دفن لجن و محدودیت های زیست محیطی کاربرد لجن در کشاورزی، سوزاندن بعنوان یک راه حل مناسب برای دفع لجن مطرح می‌باشد. خاکستر لجن تصفیه خانه فاضلاب یکی از موادی است که در سالهای اخیر به عنوان جایگزین سیمان و سنگدانه در بتن و مصالح ساختمانی استفاده شده است. در پژوهش های پیشین صورت گرفته به ویژگی های دوامی بتن های حاوی خاکستر لجن فاضلاب کمتر پرداخته شده و همچنین خواص مکانیکی این نوع بتن‌ها به خصوص در جایگزینی خاکستر لجن به عنوان ریزدانه، دارای نقصان اطلاعات می‌باشد. در پژوهش حاضر در 2 گام به رفع خلاهای موجود پرداخته شد.

در گام اول به بررسی خواص مکانیکی و خواص تازه نمونه‌های بتنی حاوی خاکستر لجن فاضلاب به عنوان ماده جایگزین سیمان وریزدانه پرداخته شد و آزمایش‌های متنوعی اعم از اسلامپ، مقاومت فشاری، مقاومت کششی، مدول الاستیسیته بر روی نمونه ها صورت گرفت تا تناقضات و خلاهای موجود در پژوهش های پیشین برطرف گردد. در گام دوم به بررسی خواص دوامی نمونه‌های بتنی حاوی خاکستر لجن فاضلاب به عنوان ماده جایگزین سیمان وریزدانه که تاکنون کمتر مورد مطالعه قرار گرفته اند، پرداخته شد. مقاومت الکتریکی، عمق نفوذ آب، جذب آب، RCPT و پوسته شدن بتن در معرض سیکل های یخ زدن و آب شدن در مجاورت مواد یخ زدا از جمله آزمایش هایی هستند که بر روی این بتن‌ها انجام گردید.

از نتایج بدست آمده می‌توان استنباط کرد که جایگزینی خاکستر لجن تصفیه خانه فاضلاب به جای سیمان ( تا 20 درصد) یا ریزدانه ( تا 15 درصد) در بتن منجر به کاهش کارایی به ترتیب تا حدود 35 و 85 درصد و افت خواص مکانیکی به ترتیب تا حدود 25 و 20 درصد و از طرف دیگر تا حدی باعث بهبود پارامترهای دوامی به ترتیب تا حدود 25 و 50 درصد می‌شود. لذا با ملاک قرار دادن خواص مکانیکی، استفاده از این خاکستر در بتن به عنوان جایگزین سیمان یا ریزدانه می‌باید به10% تا 20%، بسته به کاربرد مورد نظر اعم از سازه‌ای یا غیر سازه‌ای، محدود گردد.

کلیدواژه‌ها

موضوعات

تکنولوژی بتن

عنوان مقاله [English]

Evaluation of Mechanical and Durability Properties of Concrete Containing Sewage Sludge Ash(SSA) as a Substitute for Cement or Fine Aggregate

نویسندگان [English]

Amirmahdi Nikmanesh ¹
Amirmohammad Ramezanianpour ²
Mohammad Shekarchizadeh ³

¹ M.Sc. of structural engineering. University of Tehran

² Associate Professor. School of Civil Engineering, University of Tehran

³ Professor. School of Civil Engineering, University of Tehran

چکیده [English]

With the development of the human community and increasing number of treatment plants, the treatment and disposal of high volume of sludge requires efficient management. Nowadays, due to the lack of land for burying sludge and environmental limitations of using sludge in agriculture, incineration is considered as a proper solution for sludge disposal. Sewage sludge ash is one of the materials that has been used in recent years as a substitute for cement and stone materials in concrete and construction materials.
Previous studies have paid less attention to the durability properties of concretes containing sewage sludge ash, and also the mechanical properties of this type of concrete, especially in the replacement of sludge ash as fine aggregate, have not been fully investigated and Characteristics such as tensile strength, modulus of elasticity need further investigation. The present research was compiled in two steps.
In the first step, the mechanical properties and fresh properties of concrete samples containing sewage sludge ash as an alternative to cement or fine aggregate were investigated, and various tests including slump, compressive strength, tensile strength, modulus of elasticity were performed on the samples to resolve contradictions in previous researches. In the second step, the durability properties of concrete samples containing sewage sludge ash as an alternative to cement or fine aggregate, which have been less studied so far, were investigated. Electrical resistivity, water penetration depth, water absorption, RCPT and salt scaling of concrete exposed to de-ice chemicals tests performed on these concretes.
From the obtained results, it can be inferred that the replacement of SSA instead of cement (up to 20%) or fine aggregate (up to 15%) in concrete leads to a reduction in workability up to 35% and 85%, and a decrease in mechanical properties, up to About 25% and 20% and on the other hand to some extent improves the durability parameters up to about 25% and 50%, respectively. Therefore, considering the mechanical properties, the usage of this ash in concrete as an alternative to cement or fine aggregate should be limited to 10% to 20%, depending on the application, whether structural or non-structural.

کلیدواژه‌ها [English]

Sustainable Development
Sewage Sludge Ash
Filler
Pozzolan
Durability

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