Development of an Estimation Method for Depth of Spalling Damage in Concrete Pavement by Ultrasonic Velocity Measurement

Round 1

Reviewer 1 Report

Thank you for your effort to apply NDT for PCC pavement. It will be good reference for future researchers. For the next research, I recommend Indirect test method using Ultrasonic without coreing of PCC. 

Author Response

Appreciate for taking a close review at our Manuscript.

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Reviewer 2 Report

A very interesting manuscript.

It shows a very important issue of road degradation.

Better discuss the accuracy and reproducibility of the ultrasonic method.

In summary, provide practical recommendations for road maintenance for road managers and administrations.

The original non-destructive test (Ultrasonic Velocity Measure) is described in the manuscript. It is very important in the case of existing surfaces. Compared to other publications, a wider range of results is shown for other cases. The conclusions are clear and clear, it is only worth indicating a practical recommendation for administration and road managers.

Author Response

Appreciate for taking a close review at our Manuscript.

We are submitting a word file containing your responded to the of comments by the reviewers.

We have carefully responded to the reviewers' detailed reviews.

We heartily thank you.

Author Response File: Author Response.docx

Reviewer 3 Report

Ultrasonic pulse velocity is based on 1-D compressional wave propagation, governed by several mechanical properties. The authors should consider the mechanical properties and their environmental effects on the measurement. For example, relative humidity and temperature play a significant role in ultrasonic pulse velocity. That is why the measurement itself cannot be the criteria of concrete quality as shown in Table 3, where the range of velocities varies. The experimental results in Figure 7 show that the specimens from the field have a large range of ultrasonic velocity including outliers over the set of measurements, compared to the lab mix specimens. However, the authors just classified all "good" specimens. The authors should mention the environmental issue and how to use the absolute number of ultrasonic velocities before concluding the classification.

 

Author Response

Appreciate for taking a close review at our Manuscript.

We are submitting a word file containing your responded to the of comments by the reviewers.

We have carefully responded to the reviewers' detailed reviews.

We heartily thank you.

Author Response File: Author Response.pdf

Round 2

Reviewer 3 Report

The authors responded to my comment correctly.