Production of High-Quality Coarse Recycled Aggregates through a Two-Stage Jigging Process
, Weslei M. Ambrós 2, Gerson L. Miltzarek 2, Carlos Hoffmann Sampaio 3,*, Josep Oliva Moncunill 3, Bogdan Grigore Cazacliu 4 and Denise C. C. Dal Molin 5Round 1
Reviewer 1 Report
The authors wrote the manuscript on “production of high-quality coarse recycled aggregates through a two-stage jigging process”. The process is good as the author used the waste materials.
The authors only calculated the density, water absorption, size distribution, and shape index etc. However, the strength measurement is necessary as the author mentioned about the high strength concrete. Also, how the authors mentioned about high quality? If the authors explain about the mechanism of high strength material production, it will be good. Check the morphology of the initial raw materials and final product as well.
Author Response
Responses in a pdf enclosed.
Author Response File: 
Author Response.pdf
Reviewer 2 Report
The manuscript entitled "Production of High-quality Coarse Recycled Aggregates Through a Two-stage jigging process investigated the usage of hydraulic jig to produce recycled aggregates from a sample of Brazilian
construction and demolition waste. Different analysis methods were utilized in terms of size distribution density, shape index, and water absorption. The paper is well-organized and the usage of the English language is fine.
Although it can be acceptable in its current form, I think it will be better after revisioning some sections. Please find below my comments and suggestions;
-The introduction section is well-written and the previous studies on that subject are presented in detail. But I think it will be better to add some statements to the last paragraph for showing the originality and
need for such a study in literature. And if possible, move the last sentence to the Conclusions section.
-And the Taggart concentration criteria are mentioned. This is good. I think it will be better to show some calculations of this criteria with the possible densities of feed components in experimental studies. And also present why jig was selected for this study. As well-known this criterion is used for selecting the suitable instrument for the gravity process by using the medium and material density properties.
- In the characterization and analysis section, can you please write the equation for calculating the shape index values?
- In the results and discussion section, according to the separation principle of jig equipment, it was mentioned that a high-quality concrete can be obtained after 2-stage jigging. It's ok but is that also possible to separate the ceramics and mortar in the final waste products in another jigging stage? This is not a mandatory revision but if present it will be good to present.
- In figure 7, it will be better to write which shape index was used.
My overall suggestion is minor revision before publication in this prestigious journal.
Author Response
Responses in a pdf enclosed.
Author Response File: Author Response.pdf
Reviewer 3 Report
In this research, the authors showed that it was possible to recover high-quality recycled aggregate with more than 99.5% of concrete particles with the properties similar to those of natural aggregates. The process of producing the high-quality recycled aggregate seems to be expensive. Could the author mention if it is cost-effective? Are there any data on cost accounting? Authors should provide information related to this.
Author Response
Responses in a pdf enclosed.
Author Response File: Author Response.pdf
Round 2
Reviewer 1 Report
It can be acceptable in its current form.
