A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Removing attached mortar from recycled aggregate by the combined freeze–thaw cycles and high‐temperature drying
The fundamental reason for the poor performance of recycled aggregate (RA) and recycled aggregate concrete (RAC) is the attached mortar, which severely restricts the application of RA and RAC. This research proposes an innovative method for the modification of RA: using the freeze–thaw cycle (FTC) to remove the attached mortar. In addition, to improve the spalling efficiency, high temperature drying is introduced before and during FTCs. The results show that as the lowest temperature of FTC decreases, the spalling rate increases. Besides, the attached mortar that suffered from high temperature drying is more likely to be peeled off during the following FTCs, and more times of high temperature drying treatments can provide higher efficiency. At the same time, vibrating process can introduce mechanical damage, which is also beneficial for the removal of mortar. Finally, after proper combination of FTC, high temperature drying and vibrating, all attached mortar can be peeled off quickly, and the physical/mechanical properties of modified RA can be very close to the natural aggregates.
Removing attached mortar from recycled aggregate by the combined freeze–thaw cycles and high‐temperature drying
The fundamental reason for the poor performance of recycled aggregate (RA) and recycled aggregate concrete (RAC) is the attached mortar, which severely restricts the application of RA and RAC. This research proposes an innovative method for the modification of RA: using the freeze–thaw cycle (FTC) to remove the attached mortar. In addition, to improve the spalling efficiency, high temperature drying is introduced before and during FTCs. The results show that as the lowest temperature of FTC decreases, the spalling rate increases. Besides, the attached mortar that suffered from high temperature drying is more likely to be peeled off during the following FTCs, and more times of high temperature drying treatments can provide higher efficiency. At the same time, vibrating process can introduce mechanical damage, which is also beneficial for the removal of mortar. Finally, after proper combination of FTC, high temperature drying and vibrating, all attached mortar can be peeled off quickly, and the physical/mechanical properties of modified RA can be very close to the natural aggregates.
Removing attached mortar from recycled aggregate by the combined freeze–thaw cycles and high‐temperature drying
Wu, Qingpei (author) / Gong, Fuyuan (author) / Zhi, Dian (author) / Zhao, Yuxi (author)
Structural Concrete ; 23 ; 3126-3139
2022-10-01
14 pages
Article (Journal)
Electronic Resource
English
Durability of Structural Recycled Aggregate Concrete Subjected to Freeze-Thaw Cycles
| DOAJ | 2020
| Taylor & Francis Verlag | 2023
| Springer Verlag | 2017