Influence of fly ash as a cement addition on the hardened properties of recycled aggregate concrete |
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Authors: | Shi Cong Kou Chi Sun Poon Dixon Chan |
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Affiliation: | (1) Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong |
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Abstract: | The effects of the use of Class F fly ash as a cement addition on the hardened properties of recycled aggregate concrete were
determined. In this study, four series of concrete mixtures were prepared with water-to-cement (w/c) ratios of 0.55, 0.50, 0.45 and 0.40. The recycled aggregate was used as 0%, 20%, 50% and 100% replacements of coarse natural
aggregate. Furthermore, fly ash was employed as 0% and 25% addition of cement. Although the use of recycled aggregate had
a negative effect on the mechanical properties of concrete, it was found that the addition of fly ash was able to mitigate
this detrimental effect. Also, the addition of fly ash reduced the drying shrinkage and enhanced the resistance to chloride
ion penetration of concrete prepared with recycled aggregate. Moreover, it was found that the drying shrinkage and chloride
ion penetration decreased as the compressive strength increased. Compared with the results of our previous study, the present
study has quantified the advantages of using fly ash as an additional cementitious material in recycled aggregate concrete
over the use of fly use as a replacement of cement. |
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Keywords: | Chloride ion penetration Drying shrinkage Fly ash Mechanical properties Recycled aggregate |
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