Coated Recycled Aggregates

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  • Topic: Concrete, Construction aggregate, Fly ash
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Volume 12 Issue 3 Version 1.0 Year 2012 Type: Double Blind Peer Reviewed International Research Journal Publisher: Global Journals Inc. (USA) Online ISSN: 2249-4596 & Print ISSN: 0975-5861

Global Journal of Researches in Engineering Civil And Structural Engineering

Coated Recycled Aggregate Concrete Exposed To Elevated Temperature By Arundeb Gupta Somnath Ghosh & Saroj Mandal
Jadavpur University, India Abstract - An experimental investigation has been conducted to study the mechanical as well as micro structural properties of Recycled aggregate concrete (RAC) with uncoated and Geopolymer / Cement coated recycled aggregate exposed to elevated temperature. Fly ash (as replacement of cement) was added while making concrete. Cubes test specimens were prepared and cured under water for 28 days. Test specimens were exposed to different levels of temperature (400oC, 600oC, 800oC) for a period of 6 hours in the muffle furnace. The reduction in compressive strength was observed are in the ranges from 23.4% to as high as 50.3% when exposed to different elevated temperature. MIP (Mercury intrusion porosimetry) test was conducted to estimate the pore diameter and also to appreciate the change of total pore volume due to change of exposure temperature. SEM (Scanning electron microscopy) study was also done to appreciate the micro-structural change in recycled aggregate concrete.

Keywords : Coated Recycled aggregate, Natural aggregate, Concrete, Fly ash, Elevated temperature, Geopolymer, Mercury intrusion porosimetry, Compressive strength. GJRE-E Classification : FOR Code: 090503

Coated Recycled Aggregate Concrete Exposed To Elevated Temperature Strictly as per the compliance and regulations of:

© 2012. Arundeb Gupta Somnath Ghosh & Saroj Mandal. This is a research/review paper, distributed under the terms of the Creative Commons Attribution-Noncommercial 3.0 Unported License http://creativecommons.org/licenses/by-nc/3.0/), permitting all non commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Coated Recycled Aggregate Concrete Exposed To Elevated Temperature Arundeb Gupta α Somnath Ghoshσ & Saroj Mandalρ
to study the mechanical as well as micro structural properties of Recycled aggregate concrete (RAC) with uncoated and Geopolymer / Cement coated recycled aggregate exposed to elevated temperature. Fly ash (as replacement of cement) was added while making concrete. Cubes test specimens were prepared and cured under water for 28 days. Test specimens were exposed to different levels of temperature (400oC, 600oC, 800oC) for a period of 6 hours in the muffle furnace. The reduction in compressive strength was observed are in the ranges from 23.4% to as high as 50.3% when exposed to different elevated temperature. MIP (Mercury intrusion porosimetry) test was conducted to estimate the pore diameter and also to appreciate the change of total pore volume due to change of exposure temperature. SEM (Scanning electron microscopy) study was also done to appreciate the micro-structural change in recycled aggregate concrete.

Abstract - An experimental investigation has been conducted

II.

Experimental Details

Keywords : Coated Recycled aggregate, Natural aggregate, Concrete, Fly ash, Elevated temperature, Geopolymer, Mercury intrusion porosimetry, Compressive strength.

se of recycling of concrete waste have already been started all over the world but the use is restricted. Recycled aggregates have some basic problems like excessive absorption phenomena, poor surface texture, formation of weak interfacial zone etc compared with natural aggregates. Different research works are in progress to improve recycled aggregate properties, so that high performance concrete could be developed out of concrete waste (as coarse aggregate) [9] . Pre soaking of recycled aggregate in some acidic medium (HCl, H2So4 / H3Po4) is suggested to improve the quality [1].But addition of...
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