Internal curing effect of raw and carbonated recycled aggregate on the properties of high-strength slag-cement mortar

• Published in: Construction & building materials 2018-03, Vol.165, p.64-71
• Main Authors: Abate, Selamu Yihune, Song, Keum-Il, Song, Jin-Kyu, Lee, Bang Yeon, Kim, Hyeong-Ki
• Format: Article
• Language: English
• Subjects: Aggregates (Building materials); Autogenous shrinkage; Carbonation; Curing; Degree of hydration; Dry shrinkage; High strength slag-cement mortar; Internal curing; Mechanical properties; Mortar; Properties; Recycled aggregates
• ISSN: 0950-0618; 1879-0526
• DOI: 10.1016/j.conbuildmat.2018.01.035

•RRA and CRA were used in high-strength slag-cement mortar for internal curing.•Incorporation of RA reduced both autogenous and dry shrinkage of the mortar.•Internal curing efficiency of recycled aggregates was improved by their carbonation. The internal curing effect of raw and carbonated recycled aggregates on the properties of high-strength slag-cement mortar was investigated. First, the aggregates were characterized using different methods and their effects on the shrinkage, drying mass loss, non-evaporable water content, and compressive strength of the mortar were evaluated. Their incorporation reduced the shrinkage and improves non-evaporable water content, i.e., degree of hydration, with a slight reduction in compressive strength. Because of the carbonation of the aggregates, the mixtures incorporating carbonated aggregates show lesser improvements in non-evaporable water content and compressive strength than the ones with non-carbonated aggregates. However, the shrinkage property was better improved by the incorporation of the carbonated ones.