IJE TRANSACTIONS B: Applications Vol. 29, No. 2 (February 2016) 192-201    Article Under Final Proof

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G. Shafabakhsh and S. Ahmadi
( Received: October 16, 2015 – Accepted: January 26, 2016 )

Abstract    The use of pervious concrete has been significantly considered in recent years. This consideration is due to the properties of pervious concrete in relating to the environmental sustainability that is utilized in the effective management of the runoff from rainfall. Coal extraction and rice husk obtained from milling, produces wastes that have no application and followed by environmental pollution. The purpose of the current research, is to evaluate of the effects of coal waste ash (CWA) and rice husk ash (RHA) and to compare between the mechanical properties of pervious concrete pavement. Therefore, both of these wastes were burned and after that XRF testing it was observed that they both achieve Pozzolanic properties. In order to strengthen pozzolanic cement paste has been used CWA and RHA as a cement replacement in concrete mixtures. The results indicated that the addition of RHA and CWA improved the mechanical properties of pervious concrete, however the optimum percentage is dramatically varying. Among these, the effectiveness of CWA is more significant compared to RHA. By increasing the amount of CWA and RHA to the optimum level, the permeability of the pervious concrete will decrease simultaneously. Meanwhile, after the optimum level, it will be reversed.


Keywords    Pervious Concrete Pavement, Mechanical Properties, Rice Husk Ash, Coal Waste Ash


چکیده    استفاده از بتن متخلخل به طور قابل توجهي در چند سال اخير مورد توجه قرار گرفته است. اين توجه به دليل ويژگي هاي بتن متخلخل در رابطه با محيط زيست پايدار در مورد مديريت موثر رواناب ناشي از بارندگي مورد توجه مي باشد. استخراج زغال سنگ و پوسته برنج بدست آمده از شالیکوبی، پسماندهایی را تولید می کند که هیچ کاربردی نداشته و آلودگی محیط زیست را در پی دارد. هدف از این پژوهش بررسی اثر ضایعات زغال سنگ سوخته و خاکستر پوسته برنج و مقایسه بین این دو بر خصوصیات مکانیکی روسازی بتنی متخلخل می باشد. بنابراین در این مطالعه هر دوی این مواد پسماند سوزانده شده و بعد از انجام آزمایشاتXRF مشخص گردیدکه هر دو این مواد خاصیت پوزولانی پیدا می کنند. در مطالعه حاضر به منظور تقویت خمیر سیمان از پودر ضایعاتی زغال سنگ سوخته و خاکستر پوسته برنج به عنوان جایگزین بخشی از سیمان در ترکیبات بتن استفاده شده است. نتایج نشان می­دهد اضافه شدن پودر ضایعاتی زغال سنگ سوخته و خاکستر پوسته برنج سبب بهبود خصوصیات مکانیکی بتن متخلخل می شوند این در حالی است که محدوده درصد بهینه آنها متغیر می­باشد. در این بین اثر پودر ضایعاتی زغال سنگ سوخته بسیار چشمگیرتر از خاکستر پوسته برنج بوده است و از طرف دیگر با افزایش مقدار پودر ضایعاتی زغال سنگ سوخته وخاکستر پوسته برنج تا مقدار بهینه نفوذپذیری بتن متخلخل کاهش و در ادامه افزایش می یابد.



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