Comparison of the Mechanical Behavior of Concrete Containing Recycled CFRP Fibers and Polypropylene Fibers
Round 1
Reviewer 1 Report
The paper is a LAB reports, not a technical research paper, and the selection of quanities of fibers are specific, there is not much importance for the research of fiber concrete.
Author Response
A file with the responses to the observations is attached.
Author Response File: 
Author Response.pdf
Reviewer 2 Report
In this article, the authors have compared the mechanical behavior of concrete containing recycled CFRP fibers and polypropylene fibers. The detailed comments are as follows:
- There are different types of fibers available in the market to improve the properties of concrete. Authors have mentioned that polypropylene fibers are commonly used in concrete. The authors should discuss the reason behind the common use of polypropylene fibers in concrete. Authors may consider the following article: https://doi.org/10.1016/j.cemconcomp.2019.01.005
- The results of this study are not new. The authors should clearly discuss the need for this study.
- How have the authors measured the strain? It is unclear.
- A detailed discussion is missing. Authors may consider the above-mentioned article and other articles discussed in the references of the above-mentioned article to improve the discussion of results.
Author Response
A file with the responses to the observations is attached.
Author Response File: Author Response.pdf
Reviewer 3 Report
The paper is an interesting insight into the possible use of recycled carbon fibers as an alternative to polypropylene fibers. However there are some issues I would like authors to comment upon:
1) Both types of fibres have different shapes and measurements. Why this type of polypropylene fibres was used as a reference?
2) There is no statistics done for some of the results, which makes analysis extremely difficult. For example in Fig. 7 lack of statistical information such as, at least, standard deviation, makes it hard for the reader to judge if the differences between fracture energy is significant or not.
3) Were any test performed to see if the fibres are well spaced in the samples, and how well carbon fibers integrate into the mix?
4) Table 2 is very hard to understand; it might be better to make it into 2 separate tables.
5) How were the concrete composition determined?
Author Response
A file with the responses to the observations is attached.
Author Response File: Author Response.pdf
Round 2
Reviewer 1 Report
The literature review on the topics is relatively insufficient, more recent and relative studies are suggested to be included in the reference, the following references are suggested to be added.
[1] Experimental and analytical study on a new kind of steel-PVA hybrid fiber concrete in the anchorage zone of bridge expansion and contraction installation[J]. Materiale in tehnologije, 2021, 2.
Author Response
The indicated paper has been added to the references.
Reviewer 2 Report
The authors have revised the article as per reviewers' comments. Therefore, it is suitable for publication.
Author Response
Thank you very much for the observations made in the previous review, because they have helped to improve the paper.
