| Title |
Changes in Physical Properties of High-strength Concrete due to the Influence Cement Paste Attached to Recycled Fine Aggregates |
| Authors |
김한식(Kim, Han-Sic) ; 하정수(Ha, Jung-Soo) ; 이영도(Lee, Young-Do) |
| DOI |
https://doi.org/10.5659/JAIK.2022.38.2.187 |
| Keywords |
Recycled fine aggregate; Attached cement paste; Autogenous shrinkage; Moisture supply |
| Abstract |
This study is to confirm an appropriate substitution rate by evaluating the autogenous shrinkage and physical properties of high-strength
concrete by supplying moisture required for hydration reaction by recycled fine aggregates containing a lot of moisture by attached cement
paste. The experimental variables were the moisture content and substitution rate of the recycled fine aggregate, and the hydration
temperature, length change, and compressive strength characteristics were evaluated. As moisture was supplied by recycled fine aggregates,
cement paste at a low water-cement ratio was able to reduce autogenous shrinkage and continue hydration reactions. However, when the
substitution rate of the recycled fine aggregate exceeds 30%, the decrease in strength was large due to the influence of the attached cement
paste. From these results, it was confirmed that the decrease in strength due to the attachment cement paste was not significant and the
substitution rate of the recycled fine aggregate that helps to continue the hydration reaction was 30%. |