The Mechanical Properties and Chlorine Resistance of Concrete Based on the Effects of Pouring Interval Time
Round 1
Reviewer 1 Report
Comments and Suggestions for AuthorsTitle: Study on mechanical properties and chlorine resistance of concrete based on the effects of pouring interval time.
The following comments are to be addressed while preparing the revised manuscript
1. The authors have discussed entire results in the abstract section. It is suggested to short the content for the better improvement of abstract section.
2. Page 2: Line 48-51: The following sentences are unclear. It is suggested to reframe the sentence for better readability.
a) Instead, there exists a certain pouring interval time, such as wet joints in precast beams, continuous casting of rigid frame beams, and repair of damaged structures with high-toughness concrete, thereby creating a special "interlayer weak surface" in staged pouring concrete [1-5].
b) staged pouring concrete, on the other hand, involved pouring the lower half of the concrete specimen first, followed by pouring the upper half after the specified pouring interval time, resulting in the desired staged pouring concrete specimen.
3. It is suggested to discuss the difference between the ‘staged pouring concrete’ and conventional concrete in the introduction. It will help the readers to ease in understanding the concept.
4. Page 3: Section 2.1: The authors have mentioned that polypropylene fiber was one of the ingredients of concrete. It is suggested to include the volume fraction of polypropylene fiber?
5. Page 3: Line 124: What is the reason for using these three types of aggregates (fine sand, medium stone and small stone) in the concrete?
6. If pouring interval time is followed between the first layer and new layer, it greatly affects the bonding. Hence, what is the application of this staged pouring concrete?
7. It is suggested to correct the grammatical errors found in the manuscript.
8. What is the term ‘mechanism sand’ mentioned in the table 1.
9. Is there any reference for using 10 %/L NaCl solution for ingression of chloride ion concentration into the concrete? The percentage levels seem high.
10. Page 5: The figure 3 is blur. It is suggested to provide a quality image.
11. Page 7: Figure 6 depicted that the compressive strength of poured concrete decreases from 3-12 hours. But the compressive strength of the poured concrete gets increases after 18 and 24 hours’ time interval. It is asked to give explanation for this.
12. What is the term ‘Average aoerture’ mentioned in the y-axis of figure 10 (c).
Author Response
The authors appreciate the comment from the reviewer. And we provide a cover letter to explain the details of the revisions to the manuscript and responses to the reviewers' comments.
Author Response File: 
Author Response.pdf
Reviewer 2 Report
Comments and Suggestions for AuthorsThe manuscript is very clearly organized with a neat presentation of data, with a high degree of reproducibility.
I recommend this paper to be published, but I believe some minor additions would further highlight the quality of the paper. Therefore adding clear statements regarding the novelty of the study, as well as emphasising the application-orientated added value that this thoroughly performed experimental study brings to the domain.
Author Response
The authors sincerely appreciate the recognition from the reviewer for our research. And we provide a cover letter to explain the details of the revisions to the manuscript and responses to the reviewers' comments.
Author Response File: Author Response.pdf
Reviewer 3 Report
Comments and Suggestions for Authors Lines 26-28. "The most significant strength decrease occurred at a 24-hour interval, with reductions in splitting tensile strength of 40.93%, 32.92%, and 32.93% at 7 days, 28 days, and 56 days, respectively" and Lines 31-33. « At a pouring interval time of 12 hours, the compressive strength of staged pouring concrete decreased the most, with reductions of 25.90%, 34.34%, and 14.69% at 7 days, 28 days, and 56 days, respectively. Results". These two statements contradict each other, because it is not clear at what interval time: 12 or 24 hours, the strength decreased the most. Clarify or correct this; Lines 419–421. “...it can be observed that compared to the control group T0 concrete, although the number of harmless micropores (<50nm) increases with the increase in pouring interval time up to 12 hours, there is a significant increase in harmful macropores (>50nm )...". Explain what “harmless” and “harmful” macropores mean?Author Response
The authors appreciate the comment from the reviewer. And we provide a cover letter to explain the details of the revisions to the manuscript and responses to the reviewers' comments.
Author Response File: Author Response.pdf
Reviewer 4 Report
Comments and Suggestions for AuthorsDear authors,
thank you for your work.
Please, make the Introduction more deep, for example add information about high-performance fine-grained nanostructured concrete it would be more interesting. For example
Rassokhin A.S., Ponomarev A.N., Karlina A.I. High-performance fine-grained nanostructured concrete based on low strength aggregates // Magazine of Civil Engineering, 2022, 114(6), 11413
Also don't finish the chapter with Figure. Add analysis after figures before next chapter.
Best regards, reviewer
Author Response
The authors sincerely appreciate the recognition from the reviewer for our research. And we provide a cover letter to explain the details of the revisions to the manuscript and responses to the reviewers' comments.
Author Response File: Author Response.pdf
Round 2
Reviewer 1 Report
Comments and Suggestions for AuthorsComments are addressed.
