Study on Preparation and Rheological Properties of 3D Printed Pre-Foaming Concrete
Round 1
Reviewer 1 Report
General
This work is very descriptive and must be reworked in a revised paper before to be published
Abstract
at the beginning, give the reason to use such systems
Section: Introduction:
Page 2
After 10-50 %: give the range of thermal conductivity
Give the densities with the same units: kg/m3 or g/cm3
Previous studies: give ref
Page 3:
Section 2.1
After: the commercial plant protein surfactant, give name and supplier
Section 2.2:
Change the maximum amount of surfactant dosed to 2%.by the amount of surfactant in the range (0-2%)
Pages 3-5
Section 2.3
Experimental methods
For clarity this section lacks of the strict logic: It is necessary to separate this section into two main sections, one concerning tests on pastes and the other on printed and cured materials.
Furthermore, section 2.3.6: 3. D Printing concrete, should be placed just before in 2.3
Page 4 :
2.3.2. Mini-slump and fluidity
Explain clearly mini-slump and fluidity experiments and put the dimensions in Figure 1a and b
Pages 4-5 change in Figure 2, I, II, III by i, ii, iii as in the text or change in the text
Page 6
Section 3.1
for 3DFCs mixed with surfactants, even a lower initial fluidity can still meet the printing requirements: Have you checked that it is good for materials with surfactant and not for paste without surfactant?
It seems that there is a confusion between fluidity loss and fluidity. Same for mini slump and mini slump gain
Figure 3: show standard deviation
Page 8
To go one step further, we plot ….. which is in good agreement with the experimental data: Where are the plot
Page 9
Section3.3
As demonstrated in previous study:at least, give a ref.
Page 10
Figure 6: plot the shear rate vs time in Figure 6
Page 11:
Show cracks (arrow) in Figure show the cracks for the highest surfactant content
After Fig.7 remove directly shows ( it's 2 times)
Pages 11 and 12
Clearly explain the parameters measured by the MIT technique and Figure 9A and b
Discuss Figure 9b
Page 13
Provide a figure showing the failed samples (at least one) and high magnification micrographs of all the failed samples and discuss them with other results.
Figure 10: give standard deviation for density
A discussion section must be added
Page 14
The highlights of this discussion should be reflected in the conclusion afterwards.
Author Response
Please see the attachment
Author Response File: 
Author Response.pdf
Reviewer 2 Report
This manuscript aims to study the fresh-state properties and hardened properties of 3D printed pre-foaming concrete. This topic is interesting and well combined with applied sciences of concrete. The logical structure, data analysis and language expression of this manuscript need to be improved. The authors need to revise the paper by considering the following recommendations:
1. The text and the English language in the revised paper must be checked, edited and corrected by native English speakers.
2. Keywords: I recommend organizing the keywords according to the structure of the article.
3. In Table 2, are the water-solid ratio and sand-solid ratio units (%)? If not, please modify it. In addition, there is an extra blank column in Table 2.
4. All the experimental methods and/or, procedures as described in this manuscript should refer to the accepted international standards/codes.
5. Conclusion: the conclusion should be a summary of the results, not a repetition of the results. A comprehensive summary of the content and innovation of the manuscript needs to be improved.
Author Response
Please see the attachment.
Author Response File: 
Author Response.docx
