Concrete Additive Manufacturing in Construction: Integration Based on Component-Related Fabrication Strategies
Round 1
Reviewer 1 Report
The submitted manuscript is about the applicability and possible fabrications strategies of concrete additive manufacturing to integrate concrete additive manufacturing on component level. I kindly ask authors to prepare a point-by-point rebuttal response letter and must be subjected to the manuscript as well, considering the following comments.
1) Please make very comprehensive introduction, reporting earlier promising studies.
2) What are the distinguishing features between the three main groups of additive manufacturing processes (extrusion, spraying-based, and particle bed-based) for concrete components, as mentioned in the article?
3) In the context of additive manufacturing with concrete, which types of components (compressive or flexural) are predominantly produced using the extrusion method, based on the information provided in the article?
4) According to the article, what is the potential future application of 3D printing of concrete in terms of integrating it into the conventional design and construction process?
5) In the field of additive manufacturing with concrete, what are some of the challenges that have not yet been fully addressed in terms of exploring the full potential of different structural component types?
6) What are some of the factors that contribute to the potential of additive manufacturing with concrete to decrease labor costs and increase material efficiency and geometric complexity of non-standardized building components, as stated in the article?
7) Based on the information provided in the article, what are the potential advantages of implementing a hybrid manufacturing strategy that combines conventional and additive manufacturing for future applications of additive manufacturing with concrete?
8) What are some of the types of structural components (e.g., walls, columns, slabs, beams) that are specifically addressed in the review of fabrication strategies in the article?
Author Response
Please see the attachment.
Author Response File: 
Author Response.pdf
Reviewer 2 Report
Reviewer comments and suggestions on the article entitled: “Concrete Additive Manufacturing in Construction: Integration based on component-related fabrication strategies.”
This paper focuses on exploring the potential and fabrication strategies of concrete additive manufacturing at the component level. It is divided into two main parts. The first part provides an explanation of the basic differences, methods, and processes involved in the additive manufacturing of concrete. It discusses the fundamental distinctions between additive manufacturing and conventional construction methods (such as formative or subtractive approaches) and compares the three main types of concrete additive manufacturing. In the second part, the principles and characteristics identified in the first part are applied to analyze the applicability of concrete additive manufacturing in the construction industry, specifically considering different types of structural components. The paper examines trends, potentials, and challenges based on the reviewed fabrication strategies and identifies the need for further research in this field.
However, the paper could be written more carefully. Therefore, the listed revisions should be done:
1) Line 122 “According to DIN 8580 and DIN EN 121 ISO/ASTM 52900, additive manufacturing is defined as "a process that produces components [...] from 3D model data by joining material, usually layer [...] by layer, in contrast to subtractive and forming manufacturing processes" [22,25].” What does the “[...]” mean in that passage?
2) Line 149: 4-10 mm in diameter. Bigger-sized filaments have been printed in the literature. The authors should revise or explain this dimension given here.
3) Typically, there are several rheological requirements made to printing material 166 [35,36]: (1) the material should be able to be pumped from the mixing unit to the nozzle; 167 (2) it should be able to be extruded from the nozzle in a controlled manner, e.g. by means 168 of an extruder screw; and (3) it should be dimensionally stable after it has left the nozzle.
4) Line 181: “The extrusion process is influenced by a large number of process, material, and machine parameters, including the nozzle diameter and distance, the thickness and height of the layer, the extrusion temperature or the pressure speed. In particular, nozzle speed and flow rate must be matched.” What distance is referred to here? Printing path distance or nozzle height? Or? What is the extrusion temperature during extrusion in 3DCP? What is meant by pressure speed?
5) Line 497: “In particular, masonry walls are often replaced concrete walls produced by extrusion [20].” It is not clear what replaces what. Please check.
6) Line 737: The title number is wrong. Please check it.
7) Can the employed or selected AM method affect the strength of the printed object? If yes, it should be comparatively explained.
8) In this manuscript, Figure 10 is mentioned before Figure 9. It would be more appropriate if the numbers of Figures 9 and 10 were exchanged.
9) There is a mistake in the citation order. Citation number 45 is missing. Please check the order again.
10) Is it possible to use fiber reinforcement in all these AM techniques? This should be comparatively discussed.
Recommendation: Many articles have been published on 3D concrete printing in BUILDINGS journal, so the appropriate ones can optionally be cited to enhance the manuscript and emphasize the relevancy of the journal.
Paper can be checked against typos and grammar errors using "Grammarly" software, etc.
Author Response
Please see the attachment
Author Response File: Author Response.pdf
Round 2
Reviewer 1 Report
The current version of paper is ready to be accepted for publication.
