Study on Durability and Piezoresistivity of Cement-Based Piezoelectric Materials Mixed with Carbon Fiber and Iron Tailings under Salt-Freezing Erosion
Round 1
Reviewer 1 Report
The presented research has scientific novelty and originality. The article may be published in Buildings magazine. Notes:
1) the authors in the article do not disclose the reason for the decrease in the Resistivity change rate in concrete depending on the stress;
2) correct the numbering of the list of references.
Author Response
Response 1: Thanks for your comment.Section 4.2. of the manuscript explains why the rate of resistivity change decreases with stress, “When the amount of carbon fiber is mixed to reach the permeability threshold, the charges are greatly de-trapped through the tunneling transition, the capacitive effect is enhanced. Compared with the capacitive effect, the advantage of the tunneling effect is further reduced, and the amplitude of the resistance reduction is reduced, which is manifested by a decrease in pressure sensitivity”, “Continuing to increase the amount of iron tailings sand will affect the conductive path and tunnel transition effect formed by carbon fiber overlap, and reduce the sensitivity of cement matrix composites to compressive stress”.
Response 2: Thanks for your comment. According to the comments from you, we have modified the numbering of the list of references.
Author Response File: 
Author Response.docx
Reviewer 2 Report
The manuscript is well-written. I think it can be considered for the publication after a minor revision. The following comments are given to the authors.
1. Please pinpoint the objective and innovate of this study. It will be best to be a single section,
2. Table 1 and Table 2: Please move the unit to the table header.
3. Table 3, Table 4, and Table 5: (kg/m3) is better than /kg/m3. Others are the same.
4. Table 5: Please explain the meaning of sample abbreviations when they first appear.
5. Please explain why Eq. (9) is selected to describe the relationship of freeze-thaw cycle.
6. Please check the whole manuscript. There are some typos. For example: SiO2 should be SiO2.
Author Response
Response 1: Thanks for your comment.Based on your comments, in the first section we have revised the purpose and innovation of this study, “In this study, iron tailings are added to carbon fiber cement-based materials to configure cement-based piezoelectric composites, the recycling of iron tailings is of positive significance to environmental protection.. The freeze-thaw cycle test chamber is used to simulate the extreme environments in cold areas, accelerate the sulfate freeze-thaw cycle of cement-based piezoelectric composites, and study its pressure-sensitive performance and degradation law under the action of salt and freeze-thaw cycle, so as to provide a feasible idea for the health monitoring of engineering structure under complex working conditions in cold regions.”.
Response 2: Thanks for your comment. According to the comments from you, we have moved the unit to the table header.
Response 3: Thanks for your comment.According to the comments from you, we have modified.
Response 4: Thanks for your comment. According to the comments from you, we have explained the meaning of sample abbreviations when they first appear.
Response 5: Thanks for your comment. Eq. (9) shows that with the increase of compressive stress, the resistivity change rate of each group of specimens without freeze-thaw cycles approximately conforms to the trend of linear decay.
Response 6: Thanks for your comment. According to the comments from you, we have modified.
Author Response File: Author Response.docx
Reviewer 3 Report
The article presents research on the durability and pressure-sensitive properties of cement-based composites mixed with carbon fiber and iron tailings sands after undergoing freeze-thaw cycles. Paper presents topical issue. Article is written in clear language. Introduction explain scope of the research, the entire text of the article is complete and updated. The bibliography is update and adequate related to the work. The conclusions are described in right way.
Remarks:
- There should be a gap between the unit and the value (e.g. line 171, and others)
- There is a double numbering of the literature in “References”.
- [28] (line 160) is cited in the text before [26] (line 166), and [25] is in line 286. Please also correct and check the others.
- Figure 3 and Table 5 are not cited in the text.
- In chapter 2.2. please add an explanation of the contents of Table 5.
Author Response
Response 1: Thanks for your comment. According to the comments from you, we have modified.
Response 2: Thanks for your comment. According to the comments from you, we have modified.
Response 3: Thanks for your comment. According to the comments from you, we have modified.
Response 4: Thanks for your comment. According to the comments from you, we have modified.
Response 5: Thanks for your comment. According to the comments from you, we have explained the meaning of sample abbreviations when they first appear in Table 5.
Author Response File: Author Response.docx
