{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,24]],"date-time":"2026-03-24T01:05:31Z","timestamp":1774314331690,"version":"3.50.1"},"reference-count":46,"publisher":"MDPI AG","issue":"10","license":[{"start":{"date-parts":[[2019,5,26]],"date-time":"2019-05-26T00:00:00Z","timestamp":1558828800000},"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>Recently, 3D printing has become one of the most popular additive manufacturing technologies. This technology has been utilised to prototype trial and produced components for various applications, such as fashion, food, automotive, medical, and construction. In recent years, automation also has become increasingly prevalent in the construction field. Extrusion printing is the most successful method to print cementitious materials, but it still faces significant challenges, such as pumpability of materials, buildability, consistency in the materials, flowability, and workability. This paper investigates the properties of 3D printed fibre-reinforced cementitious mortar prisms and members in conjunction with automation to achieve the optimum mechanical strength of printed mortar and to obtain suitable flowability and consistent workability for the mixed cementitious mortar during the printing process. This study also considered the necessary trial tests, which are required to check the mechanical properties and behaviour of the proportions of the cementitious mix. Mechanical strength was measured and shown to increase when the samples were printed using fibre-reinforced mortar by means of a caulking gun, compared with the samples that were printed using the same mix delivered by a progressive cavity pump to a 6 degree-of-freedom robot. The flexural strength of the four-printed layer fibre-reinforced mortar was found to be 3.44 \u00b1 0.11 MPa and 5.78 \u00b1 0.02 MPa for the one-layer. Moreover, the mortar with different types of nozzles by means of caulking is printed and compared. Several experimental tests for the fresh state of the mortar were conducted and are discussed.<\/jats:p>","DOI":"10.3390\/ma12101708","type":"journal-article","created":{"date-parts":[[2019,5,26]],"date-time":"2019-05-26T23:07:27Z","timestamp":1558912047000},"page":"1708","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":117,"title":["A Study into the Effect of Different Nozzles Shapes and Fibre-Reinforcement in 3D Printed Mortar"],"prefix":"10.3390","volume":"12","author":[{"given":"Pshtiwan","family":"Shakor","sequence":"first","affiliation":[{"name":"Centre for Built Infrastructure Research, School of Civil and Environmental Engineering, Faculty of Engineering and Information Technology, University of Technology Sydney, Ultimo, NSW 2007, Australia"}]},{"given":"Shami","family":"Nejadi","sequence":"additional","affiliation":[{"name":"Centre for Built Infrastructure Research, School of Civil and Environmental Engineering, Faculty of Engineering and Information Technology, University of Technology Sydney, Ultimo, NSW 2007, Australia"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3478-0020","authenticated-orcid":false,"given":"Gavin","family":"Paul","sequence":"additional","affiliation":[{"name":"Centre for Autonomous Systems, School of Mechanical and Mechatronic Engineering, Faculty of Engineering and Information Technology, University of Technology Sydney, Ultimo, NSW 2007, Australia"}]}],"member":"1968","published-online":{"date-parts":[[2019,5,26]]},"reference":[{"key":"ref_1","unstructured":"Buswell, R.A., Soar, R., Gibb, A.G., and Thorpe, T. (2005, January 1\u20133). The potential of freeform construction processes. Proceedings of the 16th International Symposium on Solid Freeform Fabrication, Austin, TX, USA."},{"key":"ref_2","unstructured":"Edwards, L., Holt, C., Keyte, L., and Lloyd, R. (2015). Construction 3D Printing. Concrete 2013, Concrete Institute of Australia."},{"key":"ref_3","unstructured":"Junk, S., S\u00e4mann-Sun, J., and Niederhofer, M. Application of 3D Printing for the Rapid Tooling of Thermoforming Moulds. Proceedings of the 36th International MATADOR Conference."},{"key":"ref_4","unstructured":"Kwon, H. (2002). Experimentation and Analysis of Contour Crafting (CC) Process Using Uncured Ceramic Materials, University Of Southern California."},{"key":"ref_5","unstructured":"Lipson, H., and Kurman, M. (2013). Fabricated: The New World of 3D Printing, John Wiley & Sons."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"481","DOI":"10.1115\/1.2900701","article-title":"Three dimensional printing: Rapid tooling and prototypes directly from a CAD model","volume":"114","author":"Sachs","year":"1992","journal-title":"J. Eng. Ind."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"37","DOI":"10.1016\/j.cemconres.2018.05.006","article-title":"3D printing using concrete extrusion: A roadmap for research","volume":"112","author":"Buswell","year":"2018","journal-title":"Cem. Concr. Res."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"50","DOI":"10.1016\/j.cemconres.2018.05.018","article-title":"Particle-bed 3D printing in concrete construction \u2013 Possibilities and challenges","volume":"112","author":"Lowke","year":"2018","journal-title":"Cem. Concr. Res."},{"key":"ref_9","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_10","doi-asserted-by":"crossref","first-page":"427","DOI":"10.1016\/S0926-5805(96)00166-5","article-title":"Exploratory investigation of solid freeform construction","volume":"5","author":"Pegna","year":"1997","journal-title":"Autom. Constr."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"32","DOI":"10.1108\/13552540110365144","article-title":"Experimental investigation of contour crafting using ceramics materials","volume":"7","author":"Khoshnevis","year":"2001","journal-title":"Rapid Prototyp. J."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"165","DOI":"10.1016\/j.matlet.2014.10.065","article-title":"Fiber reinforcement during 3D printing","volume":"139","author":"Christ","year":"2015","journal-title":"Mater. Lett."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"398","DOI":"10.1016\/j.conbuildmat.2017.02.037","article-title":"Modified 3D printed powder to cement-based material and mechanical properties of cement scaffold used in 3D printing","volume":"138","author":"Shakor","year":"2017","journal-title":"Constr. Build. Mater."},{"key":"ref_14","first-page":"55","article-title":"Mechanical Properties of Cement-Based Materials and Effect of Elevated Temperature on Three-Dimensional (3-D) Printed Mortar Specimens in Inkjet 3-D Printing","volume":"116","author":"Shakor","year":"2019","journal-title":"Mater. J."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"5930","DOI":"10.1002\/adma.201401804","article-title":"3D-printing of lightweight cellular composites","volume":"26","author":"Compton","year":"2014","journal-title":"Adv. Mater."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"62","DOI":"10.1016\/j.cemconcomp.2017.02.001","article-title":"Properties of 3D-printed fiber-reinforced Portland cement paste","volume":"79","author":"Hambach","year":"2017","journal-title":"Cem. Concr. Compos."},{"key":"ref_17","doi-asserted-by":"crossref","unstructured":"Ogura, H., Nerella, V., and Mechtcherine, V. (2018). Developing and testing of strain-hardening cement-based composites (SHCC) in the context of 3D-printing. Materials, 11.","DOI":"10.3390\/ma11081375"},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"209","DOI":"10.1080\/17452759.2016.1209867","article-title":"Additive manufacturing of concrete in construction: Potentials and challenges of 3D concrete printing","volume":"11","author":"Bos","year":"2016","journal-title":"Virtual Phys. Prototyp."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"784","DOI":"10.1108\/RPJ-09-2016-0154","article-title":"A review of 3D concrete printing systems and materials properties: Current status and future research prospects","volume":"24","author":"Paul","year":"2018","journal-title":"Rapid Prototyp. J."},{"key":"ref_20","doi-asserted-by":"crossref","unstructured":"Lim, S., Buswell, R.A., Le, T.T., Wackrow, R., Austin, S.A., Gibb, A.G.F., and Thorpe, T. (July, January 29). Development of a viable concrete printing process. Proceedings of the 28th International Symposium on Automation and Robotics in Construction, (ISARC2011), Seoul, Korea.","DOI":"10.22260\/ISARC2011\/0124"},{"key":"ref_21","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_22","doi-asserted-by":"crossref","first-page":"670","DOI":"10.1016\/j.conbuildmat.2018.04.017","article-title":"3D printing of earth-based materials: Processing aspects","volume":"172","author":"Perrot","year":"2018","journal-title":"Constr. Build. Mater."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"102","DOI":"10.1016\/j.matdes.2016.03.097","article-title":"Large-scale 3D printing of ultra-high performance concrete \u2013 a new processing route for architects and builders","volume":"100","author":"Gosselin","year":"2016","journal-title":"Mater. Des."},{"key":"ref_24","first-page":"373","article-title":"Size and shape effect of specimen on the compressive strength of HPLWFC reinforced with glass fibres","volume":"29","author":"Hamad","year":"2017","journal-title":"J. King Saud Univ. Eng. Sci."},{"key":"ref_25","unstructured":"Anell, L. (2015). Concrete 3d Printer. [Master Thesis, Lund University]."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"690","DOI":"10.1016\/j.conbuildmat.2018.04.195","article-title":"Mechanical properties of layered geopolymer structures applicable in concrete 3D-printing","volume":"176","author":"Nazari","year":"2018","journal-title":"Constr. Build. Mater."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/j.cemconcomp.2018.03.017","article-title":"A self-reinforced cementitious composite for building-scale 3D printing","volume":"90","author":"Soltan","year":"2018","journal-title":"Cem. Concr. Compos."},{"key":"ref_28","unstructured":"Shakor, P., Renneberg, J., Nejadi, S., and Paul, G. (2017). Optimisation of Different Concrete Mix Designs for 3D Printing by Utilising 6DOF Industrial Robot. ISARC. Proceedings of the International Symposium on Automation and Robotics in Construction, Vilnius Gediminas Technical University, Department of Construction Economics & Property."},{"key":"ref_29","unstructured":"ASTMC1437 (2019, May 24). Standard Test Method for Flow of Hydraulic Cement Mortar. Available online: https:\/\/infostore.saiglobal.com\/store\/details.aspx\/details.aspx?ProductID=1834850."},{"key":"ref_30","unstructured":"ABNT-NBR15839 (2019, May 24). Argamassa de assentamento e revestimento de paredes e tetos\u2014Caracteriza\u00e7\u00e3o reol\u00f3gica pelo m\u00e9todo Squeeze-flow. Available online: https:\/\/www.abntcatalogo.com.br\/norma.aspx?ID=59321."},{"key":"ref_31","unstructured":"ASTMC191-13 (2013). Standard Test Methods for Time of Setting of Hydraulic Cement by Vicat Needle, ASTM."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"681","DOI":"10.1016\/j.cemconres.2009.12.001","article-title":"A new look at the measurement of cementitious paste setting by Vicat test","volume":"40","author":"Sleiman","year":"2010","journal-title":"Cem. Concr. Res."},{"key":"ref_33","unstructured":"AS1012.9:2014 (2014). Methods of testing concrete\u2014Compressive strength tests\u2014Concrete, mortar and grout specimens, Standards Australia."},{"key":"ref_34","unstructured":"ASTMC293\/C293M (2002). 293 Standard Test Method for Flexural Strength of Concrete (Using Simple Beam With Center-Point Loading). ASTM Stand."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"1477","DOI":"10.1016\/S0008-8846(00)00330-6","article-title":"Study of the shear thickening effect of superplasticizers on the rheological behaviour of cement pastes containing or not mineral additives","volume":"30","author":"Cyr","year":"2000","journal-title":"Cem. Concr. Res."},{"key":"ref_36","doi-asserted-by":"crossref","unstructured":"Shakor, P., Nejadi, S., Paul, G., and Malek, S. (2019). Review of Emerging Additive Manufacturing Technologies in 3D Printing of Cementitious Materials in the Construction Industry. Front. Built Environ., 4.","DOI":"10.3389\/fbuil.2018.00085"},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"240","DOI":"10.1016\/j.applthermaleng.2017.07.002","article-title":"Flow characteristic of highly underexpanded jets from various nozzle geometries","volume":"125","author":"Li","year":"2017","journal-title":"Appl. Therm. Eng."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"4654","DOI":"10.1039\/C6SM00205F","article-title":"Rheology of cubic particles suspended in a Newtonian fluid","volume":"12","author":"Cwalina","year":"2016","journal-title":"Soft Matter"},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"96","DOI":"10.1016\/j.colsurfa.2006.04.011","article-title":"Preparation of monodisperse polymer particles and capsules by ink-jet printing","volume":"289","author":"Schroeders","year":"2006","journal-title":"Colloids Surf. A: Physicochem. Eng. Asp."},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"31","DOI":"10.1016\/j.jfoodeng.2014.03.005","article-title":"Influence of protein concentration on the physical characteristics and flow properties of milk protein concentrate powders","volume":"135","author":"Crowley","year":"2014","journal-title":"J. Food Eng."},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"510","DOI":"10.1016\/j.cemconres.2009.03.004","article-title":"Why is fresh self-compacting concrete shear thickening?","volume":"39","author":"Feys","year":"2009","journal-title":"Cem. Concr. Res."},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"399","DOI":"10.1016\/S0260-8774(03)00147-X","article-title":"Flow property measurement of food powders and sensitivity of Jenike\u2019s hopper design methodology to the measured values","volume":"61","author":"Fitzpatrick","year":"2004","journal-title":"J. Food Eng."},{"key":"ref_43","doi-asserted-by":"crossref","unstructured":"Marchment, T., and Sanjayan, J. (2019). Method of Enhancing Interlayer Bond Strength in 3D Concrete Printing. Proceedings of the 1st RILEM International Conference on Concrete and Digital Fabrication, Zurich, Switzerland, 10\u201312 September 2018, Springer.","DOI":"10.1007\/978-3-319-99519-9_13"},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"247","DOI":"10.1061\/(ASCE)0899-1561(2003)15:3(247)","article-title":"Determination of Early Age Mortar and Concrete Strength by Ultrasonic Wave Reflections","volume":"15","author":"Surendra","year":"2003","journal-title":"J. Mater. Civil Eng."},{"key":"ref_45","unstructured":"Mindess, S., Young, J.F., and Darwin, D. (2019, May 25). Concrete, Prentice Hall, Available online: https:\/\/trove.nla.gov.au\/work\/9840756?q&versionId=45251401."},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"554","DOI":"10.1016\/j.conbuildmat.2017.09.128","article-title":"Combined influence of recycled concrete aggregates and high contents of fly ash on concrete properties","volume":"157","author":"Kurda","year":"2017","journal-title":"Constr. Build. 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