بررسی عملکرد خاکستر لجن فاضلاب با و بدون نانو ذرات سیلیس در خواص مصالح پایه سیمانی خودتراکم

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه ارومیه، ارومیه

2 استادیار گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه ارومیه، ارومیه

چکیده

امروزه استفاده از مواد پوزولانی به‌عنوان جایگزین بخشی از سیمان مصرفی و به‌منظور ارتقای خواص مصالح پایه سیمانی و صرفه‌جویی در هزینه‌ها امری مهم است. از طرفی لجن فاضلاب به‌عنوان یک پسماند خطرناک برای محیط‌ زیست و سلامتی انسان مطرح است. در همین راستا در این پژوهش از خاکستر لجن فاضلاب به‌عنوان یک پوزولان مصنوعی برای ساخت مصالح پایه سیمانی خودتراکم که به‌عنوان انقلابی در صنعت بتن مطرح می‌باشند، استفاده شد. هدف از این پژوهش، تسریع در عملکرد خاکستر لجن فاضلاب با استفاده از نانو ذرات سیلیس در جهت به‌کارگیری صنعتی این ماده در تولید مصالح پایه سیمانی خودتراکم بود. در این پژوهش 10 طرح اختلاط با درصدهای مختلف جایگزینی خاکستر لجن (0، 5، 10، 15 و20 درصد) و نانوسیلیس (0 و 1 درصد) برای تولید نمونه‌های دو جزئی و سه جزئی ملات و بتن خودتراکم، طراحی شده و خواص آنها مورد بررسی قرار گرفت. نتایج نشان می‌دهند که با افزودن خاکستر لجن فاضلاب، خواص رئولوژیک و مکانیکی نمونه‌ها افت پیدا کرده و خواص دوامی آنها در حضور درصدهای پایین این پوزولان بهبود می‌یابد. با افزودن نانوسیلیس نیز خواص مکانیکی و دوامی نمونه‌ها بهبود می‌یابد. همچنین حضور نانوسیلیس در کنار ذرات خاکستر لجن باعث افزایش واکنش‌پذیری این پوزولان شده و عملکرد این ماده را بهبود می‌بخشد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

The Effect of Using Sewage Sludge Ash with and without Nano Silica Particles on Properties of Self-compacting Cement Based Materials

نویسندگان [English]

  • Amin Khoshravesh 1
  • hadi bahadori 2
  • Alireza Manafpour 2
چکیده [English]

Nowadays using pozzolanic materials is crucial as a replacement of needed cement, improving properties of cement based materials and saving costs. On the other hand sewage sludge is harmful to the environment and human health. So in this research the sewage sludge ash has been used as an artificial pozzolan to produce self compacting cement based materials which could be evaluated as a revolution in the concrete industry. The objective of this research was to accelerate the performance of sewage sludge ash by utilizing nano silica particles. This research includes 10 mix designs for self compacting mortar and concrete made up of binary and ternary cementitious blends of sewage sludge ash (0%,5%,10%,15%,20%) and nano silica (0%,1%). The results showed that by adding the sewage sludge ash, rheological and mechanical properties of the samples were reduced and for small percentages of sewage sludge ash, the durability characteristics were improved. The results also showed that adding nano silica improved the mechanical and durability properties of self compacting mortar and concrete. Finally in presence of nano silica, the reactivity of the sewage sludge ash was increased and its performance was improved.

کلیدواژه‌ها [English]

  • Self Compacting Concrete
  • Self Compacting Mortar
  • Cement Based Materials
  • Sewage Sludge Ash
  • nano silica

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