Abstract




 
   

IJE TRANSACTIONS A: Basics Vol. 31, No. 7 (July 2018) 1012-1019    Article in Press

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  COMBINE USE OF FLY ASH AND RICE HUSK ASH IN CONCRETE TO IMPROVE ITS PROPERTIES (RESEARCH NOTE)
 
V. Kanthe, S. Deo and M. Murmu
 
( Received: November 23, 2017 – Accepted in Revised Form: March 09, 2018 )
 
 

Abstract    This research paper describes the study of combined effect of Fly Ash (FA) and Rice Husk Ash (RHA) on properties of concrete as partial replacement of Ordinary Portland Cement (OPC). These by-products are having high pozzolanic reactivity. In this research, the composition of mix was used with 10% RHA along with 10, 20 and 30% FA as partial replacement of cement. In this study, the compressive strength, workability, durability performance, and microstructure of concrete were examined. The microstructures of the concrete sample were analyzed by Scanning Electron Microscope (SEM) and elemental contents by Energy Dispersive X-ray (EDX). The test results showed that the highest compressive strength was achieved by 10%RHA and 20%FA used and beyond that, the strength was shown similar to control concrete mix (CM). The Ultrasonic Pulse Velocity (UPV) test result values were above the 4.5km/s; hence it may be considered as excellent concrete as per IS code for all mix. Response Surface Methodology (RSM) was adopted for optimizing experimental data. Regression equation was yielded by the application of RSM relating response variables to input parameters. This method aids in predicting the experimental results accurately with an acceptable range of error. This type of concrete mix is very effective in enhancing the mechanical and durability properties of concrete by saving cement and cost. It also makes concrete sustainable as it reduces environmental problems.

 

Keywords    Rice Husk Ash; Fly Ash; Concrete; Compressive Strength; Workability; Durability

 

چکیده    این مقاله پژوهشی، بررسی اثر ترکیبی خاکستر (Fly Ash) و برنج خزه (RHA) بر خواص بتن به عنوان جایگزینی جزئی از سیمان پرتلند معمولی (OPC) است. این محصولات جانبی دارای واکنش پوزولانی بالا هستند. در این تحقیق ترکیب مخلوط با 10٪ RHA همراه با 10، 20 و 30٪ FA به عنوان جایگزینی جزئی سیمان مورد استفاده قرار گرفت. در این مطالعه، مقاومت فشاری، کارایی، عملکرد دوام و میکروساختار بتن مورد بررسی قرار گرفت. میکروسکوپ اسکن الکترونیک (SEM) و محتویات عنصر توسط اشعه ایکس پراشنده (EDX)، میکروساختارهای نمونه بتن مورد بررسی قرار گرفت. نتایج آزمایش نشان داد که بیشترین مقاومت فشاری با 10٪ RHA و 20٪ FA مورد استفاده قرار گرفت و از آن بالاتر بود، مقاومت نسبت به ترکیب بتن کنترل (CM) نشان داده شد. مقادیر نتایج آزمایش UPV)) بالاتر از km /s 4.5 بود؛ از این رو آن را می توان به عنوان بتن بسیار عالی در نظر گرفته شده در هر کد IS برای همه مخلوط. برای بهینه سازی داده های تجربی، روش پاسخ سطحی (RSM) مورد استفاده قرار گرفت. معادله رگرسيون با استفاده از متغيرهاي مربوط به پاسخ RSM به پارامترهاي ورودي بدست آمد. این روش در پیش بینی نتایج تجربی دقیق با دامنه قابل قبولی خطا کمک می کند. این نوع مخلوط بتنی با صرفه جویی در هزینه سیمان و سیمان در ارتقای خواص مکانیکی و دوام بتن بسیار موثر است. همچنین باعث می شود که پایدار بماند زیرا مشکلات محیط زیست را کاهش می دهد.

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