Microscopic Mechanism Study on Carbonation Resistance of Recycled Aggregate Concrete

Hai Feng Yang; Zhi Heng Deng; Xue Liang Li

doi:10.4028/www.scientific.net/AMR.194-196.1001

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 194-196Microscopic Mechanism Study on Carbonation...

Microscopic Mechanism Study on Carbonation Resistance of Recycled Aggregate Concrete

Abstract:

24 100mm × 100mm × 300mm recycled concrete prisms and 96 150mm × 150mm × 150mm cubes are completed in this paper.The relationships of the carbonation depth in each carbonation age with replacement rate of recycled coarse aggregate and fly ash is studied; The SEM is used to observe the interface structure of recycled coarse aggregate concrete and compared with ordinary concrete, and finally,a recycled concrete carbonation model is proposed. The results showed that: the substitution of recycled coarse aggregate and fly ash cut down the recycled concrete carbonation resistance significantly, which are related with the replacement rate; the content of Ca(OH)2 in the recycled aggregate concrete decreased ,also there are obvious interface transition zone between the recycled coarse aggregate and the new cement;obvious cracks and large voids are exist before the recycled aggregate concrete is loaded, which lead directly to lower carbonation resistance of the recycled concrete.

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Periodical:

Advanced Materials Research (Volumes 194-196)

Pages:

1001-1006

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.194-196.1001

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Online since:

February 2011

Authors:

Hai Feng Yang, Zhi Heng Deng, Xue Liang Li

Keywords:

Carbonation, Fly Ash (FA), Microscopic, Recycled Aggregate Concrete (RAC)

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References

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