Abstract
The aim of this study was to investigate the effect of a high volume of roof-tile waste coarse aggregate (5–13 mm) as an internal curing agent on the compressive strength, modulus of elasticity, pore structure, and hydration and pozzolanic reactions in paste of fly-ash concrete with a low water-to-binder ratio of 0.30. The fly-ash concrete specimens in which the replacement ratio of cement by Class-F fly ash was 40% by mass and that of normal coarse aggregate by roof-tile waste aggregate was 40% by volume, were cured up to 728 days. Internal curing with roof-tile waste aggregate increased the compressive strength of the fly-ash concrete by 8.4–16.5% and decreased the modulus of elasticity by 4.9–12.8%. The use of a high volume of waste aggregate decreased the volume of the capillary pores in the 0.01–10 µm range and the volume proportion of the 0.02–0.33-µm pores after 28 days, but increased the volume proportion of 0.003–0.02-µm pores slightly at 7 days and significantly up to 728 days, and the consumption of Ca(OH)2 in the fly-ash concrete. This roof-tile waste aggregate can be used as an internal water reservoir to increase the compressive strength and to improve the pore structure of concrete with a high-volume (40%) replacement of Class-F fly ash.
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Acknowledgements
The authors are grateful to master’s student Mr. Yuhei Ito, and other students in the laboratory of Hiroshima University for their help with the experimental work.
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Bui, P.T., Ogawa, Y., Nakarai, K. et al. Internal curing of Class-F fly-ash concrete using high-volume roof-tile waste aggregate. Mater Struct 50, 203 (2017). https://doi.org/10.1617/s11527-017-1073-z
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DOI: https://doi.org/10.1617/s11527-017-1073-z