{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,18]],"date-time":"2026-04-18T06:09:12Z","timestamp":1776492552015,"version":"3.51.2"},"reference-count":44,"publisher":"MDPI AG","issue":"3","license":[{"start":{"date-parts":[[2022,2,8]],"date-time":"2022-02-08T00:00:00Z","timestamp":1644278400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Materials"],"abstract":"<jats:p>Concrete 3D printing is a novel construction method that can bring new horizons to the construction industry. However, there are still many challenges that limit its capabilities. Despite the huge research efforts, to date, there are still no standardized acceptance criteria and guidelines for the evaluation of printing concrete. Therefore, the main objective of this research was to develop 3D printing mixes with different aggregate-to-binder (a\/b) ratios (1.2, 1.5, and 1.8) and evaluate it in terms of its fresh printing properties, which include the workability, extrudability, setting time, open time, and buildability. The compressive strengths of cast and printed specimens were also tested to determine the effect of the layering process. The workability was evaluated using commonly used devices in the construction industry (slump and flow table test) and was monitored over time along with the penetration test to indicate the structuration rate of concrete. From the experimental results and observations, the flow test resulted in the best indication of the structuration rate (thixotropy) of concrete, followed by the penetration and slump tests. The a\/b ratio affected all the investigated properties of the printing concrete. Higher a\/b ratios resulted in increased structuration rate, buildability, and compressive strength of cast specimens. However, for printed specimens, the compressive strength decreased with the increase in a\/b ratio due to increased thixotropy. Therefore, from the results of the present investigation, it can be concluded that high a\/b ratios (&gt;1.5) are not desirable for printing concrete.<\/jats:p>","DOI":"10.3390\/ma15031243","type":"journal-article","created":{"date-parts":[[2022,2,8]],"date-time":"2022-02-08T23:37:48Z","timestamp":1644363468000},"page":"1243","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":20,"title":["Evaluation of Workability and Structuration Rate of Locally Developed 3D Printing Concrete Using Conventional Methods"],"prefix":"10.3390","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8260-5334","authenticated-orcid":false,"given":"Sara","family":"Ahmed","sequence":"first","affiliation":[{"name":"Civil Engineering Department, American University of Sharjah, Sharjah 26666, United Arab Emirates"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3118-5074","authenticated-orcid":false,"given":"Sherif","family":"Yehia","sequence":"additional","affiliation":[{"name":"Civil Engineering Department, American University of Sharjah, Sharjah 26666, United Arab Emirates"}]}],"member":"1968","published-online":{"date-parts":[[2022,2,8]]},"reference":[{"key":"ref_1","unstructured":"(2021, November 11). News Release Bureau of Labor Statistics US Department of Labor, Available online: https:\/\/www.bls.gov\/news.release\/pdf\/cfoi.pdf."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"303","DOI":"10.1146\/annurev.energy.26.1.303","article-title":"Carbon Dioxide Emissions From the Global Cement Industry","volume":"26","author":"Worrell","year":"2001","journal-title":"Annu. Rev. Energy Environ."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"103238","DOI":"10.1016\/j.jobe.2021.103238","article-title":"Impact of using different materials, curing regimes, and mixing procedures on compressive strength of reactive powder concrete\u2014A review","volume":"44","author":"Ahmed","year":"2021","journal-title":"J. Build. Eng."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"475","DOI":"10.1007\/s11431-016-9077-7","article-title":"State-of-the-art of 3D printing technology of cementitious material\u2014An emerging technique for construction","volume":"61","author":"Ma","year":"2018","journal-title":"Sci. China Technol. Sci."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"1221","DOI":"10.1617\/s11527-012-9828-z","article-title":"Mix design and fresh properties for high-performance printing concrete","volume":"45","author":"Le","year":"2012","journal-title":"Mater. Struct."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"104115","DOI":"10.1016\/j.cemconcomp.2021.104115","article-title":"Large-scale 3D printing concrete technology: Current status and future opportunities","volume":"122","author":"Xiao","year":"2021","journal-title":"Cem. Concr. Compos."},{"key":"ref_7","unstructured":"Starr, M. (2021, November 12). World\u2019s First 3D-Printed Apartment Building Constructed in China. Available online: https:\/\/www.cnet.com\/news\/worlds-first-3d-printed-apartment-buildingconstructed-in-china\/."},{"key":"ref_8","unstructured":"Garofalo, F. (2021, February 27). The World\u2019s First 3D Printed Office Is in Dubai. Available online: https:\/\/www.lifegate.com\/worlds-first-3d-printed-office-building-dubai#:~:text=Printed in 17 days and,printed office%2C lo-cated in Dubai."},{"key":"ref_9","unstructured":"(2021, February 25). Office of the Future\/Kila Design. Available online: https:\/\/www.archdaily.com\/875642\/office-of-the-future-killa-design."},{"key":"ref_10","unstructured":"(2021, February 26). Dubai Unveils World\u2019s Largest 3D Printed Two-Storey Building. Available online: https:\/\/www.thenational.ae\/uae\/government\/dubai-unveils-world-s-largest-3d-printed-two-storey-building-1.927590#3."},{"key":"ref_11","first-page":"127","article-title":"3D-printed concrete: Applications, performance, and challenges","volume":"9","author":"Siddika","year":"2020","journal-title":"J. Sustain. Cem. Mater."},{"key":"ref_12","first-page":"14","article-title":"3D Concrete Printing: Machine and Mix Design","volume":"6","author":"Malaeb","year":"2015","journal-title":"Int. J. Civ. Eng."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"263","DOI":"10.1016\/j.conbuildmat.2018.04.115","article-title":"Fresh properties of a novel 3D printing concrete ink","volume":"174","author":"Zhang","year":"2018","journal-title":"Constr. Build. Mater."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"613","DOI":"10.1016\/j.conbuildmat.2017.12.051","article-title":"Printable properties of cementitious material containing copper tailings for extrusion based 3D printing","volume":"162","author":"Ma","year":"2018","journal-title":"Constr. Build. Mater."},{"key":"ref_15","unstructured":"Hu, J.A. (2006). A Study of Effects of Aggregate on Concrete Rheology. [Ph.D. Thesis, Iowa State University]."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"76","DOI":"10.1016\/j.cemconres.2018.04.005","article-title":"Rheological requirements for printable concretes","volume":"112","author":"Roussel","year":"2018","journal-title":"Cem. Concr. Res."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"1213","DOI":"10.1617\/s11527-015-0571-0","article-title":"Structural built-up of cement-based materials used for 3D-printing extrusion techniques","volume":"49","author":"Perrot","year":"2016","journal-title":"Mater. Struct."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"278","DOI":"10.1016\/j.conbuildmat.2018.12.061","article-title":"Rheological and harden properties of the high-thixotropy 3D printing concrete","volume":"201","author":"Zhang","year":"2019","journal-title":"Constr. Build. Mater."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"610","DOI":"10.1016\/j.jclepro.2019.02.185","article-title":"Synthesis and characterization of one-part geopolymers for extrusion based 3D concrete printing","volume":"220","author":"Panda","year":"2019","journal-title":"J. Clean. Prod."},{"key":"ref_20","doi-asserted-by":"crossref","unstructured":"Siddika, A., Hajimohammadi, A., Mamun, M.A.A., Alyousef, R., and Ferdous, W. (2021). Waste Glass in Cement and Geopolymer Concretes: A Review on Durability and Challenges. Polymers, 13.","DOI":"10.3390\/polym13132071"},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"120930","DOI":"10.1016\/j.conbuildmat.2020.120930","article-title":"Effect of recycled aggregates and treated wastewater on concrete subjected to different exposure conditions","volume":"266","author":"Ahmed","year":"2021","journal-title":"Constr. Build. Mater."},{"key":"ref_22","unstructured":"Sooryanarayana, K.P., Stynoski, P., and Lange, D. (2020, January 8). Effect of Vibration on the Rheology of Concrete for 3D Printing. Proceedings of the RILEM International Conference on Concrete and Digital Fabrication, Eindhoven, The Netherlands."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"13","DOI":"10.1016\/j.cemconcomp.2018.12.014","article-title":"3D printable concrete: Mixture design and test methods","volume":"97","author":"Rahul","year":"2019","journal-title":"Cem. Concr. Compos."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"321","DOI":"10.1122\/1.549709","article-title":"Yield Stress Measurement for Concentrated Suspensions","volume":"27","author":"Dzuy","year":"1983","journal-title":"J. Rheol."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"101833","DOI":"10.1016\/j.jobe.2020.101833","article-title":"3D printed concrete for large-scale buildings: An overview of rheology, printing parameters, chemical admixtures, reinforcements, and economic and environmental prospects","volume":"32","author":"Souza","year":"2020","journal-title":"J. Build. Eng."},{"key":"ref_26","unstructured":"Feys, D., and Khayat, K.H. (2013, January 12\u201315). Comparing Rheological Properties of SCC Obtained with the ConTec and ICAR Rheometers. Proceedings of the Fifth North American Conference on the Design and Use of Self-Consolidating Concrete, Chicago, IL, USA."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"119551","DOI":"10.1016\/j.conbuildmat.2020.119551","article-title":"Effectiveness of the rheometric methods to evaluate the build-up of cementitious mortars used for 3D printing","volume":"257","author":"Moeini","year":"2020","journal-title":"Constr. Build. Mater."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"458","DOI":"10.1016\/j.conbuildmat.2019.04.134","article-title":"Underwater 3D printing of cement-based mortar","volume":"214","author":"Mazhoud","year":"2019","journal-title":"Constr. Build. Mater."},{"key":"ref_29","unstructured":"(2011). BS EN 197-1. Raising Standards Worldwide TMBSI Standards Publication Cement Part 1: Composition, Specifications and Conformity Criteria for Common Cements, BSI."},{"key":"ref_30","unstructured":"(2006). EN 15167-1. Ground Granulated Blast Furnace Slag for Use in Concrete, Mortar and Grout-Part 1: Definitions, Specifications and Conformity Criteria, BSI."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"639","DOI":"10.1016\/j.conbuildmat.2017.04.015","article-title":"Cementitious materials for construction-scale 3D printing: Laboratory testing of fresh printing mixture","volume":"145","author":"Kazemian","year":"2017","journal-title":"Constr. Build. Mater."},{"key":"ref_32","unstructured":"(2019). ASTM C191. Standard Test Methods for Time of Setting of Hydraulic Cement by Vicat Needle 1, ASTM International."},{"key":"ref_33","unstructured":"(2021). ASTM C1437. C01 Committee Specification for Flow of Hydraulic Cement Mortar, ASTM International."},{"key":"ref_34","unstructured":"(2021). ASTM C 230. Standard Specification for Flow Table for Use in Tests of Hydraulic Cement, ASTM International."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"103","DOI":"10.1016\/j.cemconres.2018.02.001","article-title":"Early age mechanical behaviour of 3D printed concrete: Numerical modelling and experimental testing","volume":"106","author":"Wolfs","year":"2018","journal-title":"Cem. Concr. Res."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"117989","DOI":"10.1016\/j.conbuildmat.2019.117989","article-title":"Yield stress criteria to assess the buildability of 3D concrete printing","volume":"240","author":"Jayathilakage","year":"2020","journal-title":"Constr. Build. Mater."},{"key":"ref_37","doi-asserted-by":"crossref","unstructured":"Baz, B., Remond, S., and Aouad, G. (2021). Influence of the mix composition on the thixotropy of 3D printable mortars. Mag. Concr. Res., 1\u201313.","DOI":"10.1680\/jmacr.20.00193"},{"key":"ref_38","unstructured":"(2020). ASTM C 109. C01 Committee Test Method for Compressive Strength of Hydraulic Cement Mortars (Using 2-in. or [50-mm] Cube Specimens), ASTM International."},{"key":"ref_39","doi-asserted-by":"crossref","unstructured":"Ahmed, S., Mahaini, Z., Abed, F., Mannan, M.A., and Al-Samarai, M. (2021). Materials Microstructure and Mechanical Property Evaluation of Dune Sand Reactive Powder Concrete Subjected to Hot Air Curing. Materials, 15.","DOI":"10.3390\/ma15010041"},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"212","DOI":"10.1016\/j.autcon.2017.08.019","article-title":"Effects of interlocking on interlayer adhesion and strength of structures in 3D printing of concrete","volume":"83","author":"Zareiyan","year":"2017","journal-title":"Autom. Constr."},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"486","DOI":"10.1016\/j.conbuildmat.2015.05.132","article-title":"Mechanical properties of structures 3D printed with cementitious powders","volume":"93","author":"Feng","year":"2015","journal-title":"Constr. Build. Mater."},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"132","DOI":"10.1016\/j.cemconres.2019.02.017","article-title":"Hardened properties of 3D printed concrete: The influence of process parameters on interlayer adhesion","volume":"119","author":"Wolfs","year":"2019","journal-title":"Cem. Concr. Res."},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"558","DOI":"10.1016\/j.cemconres.2011.12.003","article-title":"Hardened properties of high-performance printing concrete","volume":"42","author":"Le","year":"2012","journal-title":"Cem. Concr. Res."},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"105787","DOI":"10.1016\/j.cemconres.2019.105787","article-title":"Weak bond strength between successive layers in extrusion-based additive manufacturing: Measurement and physical origin","volume":"123","author":"Keita","year":"2019","journal-title":"Cem. Concr. 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