{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,2]],"date-time":"2026-05-02T16:30:23Z","timestamp":1777739423579,"version":"3.51.4"},"reference-count":42,"publisher":"MDPI AG","issue":"21","license":[{"start":{"date-parts":[[2021,11,3]],"date-time":"2021-11-03T00:00:00Z","timestamp":1635897600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"The Ministry of Land, Infrastructure and Transport of Korea","award":["Grant 20AUDP-B121595-05"],"award-info":[{"award-number":["Grant 20AUDP-B121595-05"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Materials"],"abstract":"<jats:p>This work was designed to evaluate the interlayer strength of 3D-printed mortar with postinstalled interlayer reinforcement. Two methods of postinstalled interlayer reinforcement were considered according to the amount of overlapping. The first method did not include overlapping of the interlayer reinforcement, while the second method included overlap lengths of 20 and 40 mm. Additionally, two different curing conditions were considered: air-curing conditions and water-curing conditions. The compressive, splitting tensile, and flexural tensile strengths of 3D-printed mortar specimens with different reinforcement methods and curing conditions were investigated under three loading directions. The three loading directions were defined based on the three planes of the printed specimens. The compressive, splitting tensile, and flexural tensile strengths were dependent on the loading directions. In particular, the splitting and flexural tensile strengths decreased considerably when tensile stresses acted on the interlayers of the 3D-printed mortar specimens. However, when longitudinal interlayer reinforcement penetrated the printed layers, the flexural tensile strength or interlayer bonding strength of the printed specimens increased significantly at the interlayers. In addition, mortar specimens reinforced with overlap lengths of 20 and 40 mm were investigated in this study. The flexural tensile strength or interlayer bonding strength of 3D-printed mortar decreased after treatment under air-curing conditions because the interlayers of the printed mortar formed more pores under these conditions and were more vulnerable under loading. Finally, the findings of this study suggested that interlayer reinforcement is a potential method for improving the interlayer bonding strength of 3D-printed mortar.<\/jats:p>","DOI":"10.3390\/ma14216630","type":"journal-article","created":{"date-parts":[[2021,11,3]],"date-time":"2021-11-03T21:57:49Z","timestamp":1635976669000},"page":"6630","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Interlayer Strength of 3D-Printed Mortar Reinforced by Postinstalled Reinforcement"],"prefix":"10.3390","volume":"14","author":[{"given":"Jihun","family":"Park","sequence":"first","affiliation":[{"name":"Department of Civil Engineering, Kunsan National University, Kunsan 54150, Korea"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6575-6322","authenticated-orcid":false,"given":"Quang-The","family":"Bui","sequence":"additional","affiliation":[{"name":"Department of Civil Engineering, Kunsan National University, Kunsan 54150, Korea"}]},{"given":"Jungwoo","family":"Lee","sequence":"additional","affiliation":[{"name":"Department of Infrastructure Safety Research, Korea Institute of Civil Engineering and Building Technology, Goyang 10223, Korea"}]},{"given":"Changbin","family":"Joh","sequence":"additional","affiliation":[{"name":"Department of Infrastructure Safety Research, Korea Institute of Civil Engineering and Building Technology, Goyang 10223, Korea"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1937-0610","authenticated-orcid":false,"given":"In-Hwan","family":"Yang","sequence":"additional","affiliation":[{"name":"Department of Civil Engineering, Kunsan National University, Kunsan 54150, Korea"}]}],"member":"1968","published-online":{"date-parts":[[2021,11,3]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"24","DOI":"10.1007\/s43452-021-00183-w","article-title":"Investigation of Steel Wire Mesh Reinforcement Method for 3D Mortar Printing","volume":"21","author":"Liu","year":"2021","journal-title":"Arch. Civ. Mech. Eng."},{"key":"ref_2","first-page":"101684","article-title":"Feasibility of Glass\/Basalt Fiber Reinforced Seawater Coral Sand Mortar for 3D Printing","volume":"37","author":"Li","year":"2021","journal-title":"Addit. Manuf."},{"key":"ref_3","first-page":"101617","article-title":"Development of Extrudable High Strength Fiber Reinforced Mortar Incorporating Nano Calcium Carbonate","volume":"37","author":"Chu","year":"2021","journal-title":"Addit. Manuf."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"132","DOI":"10.1016\/j.cemconres.2019.02.017","article-title":"Hardened Properties of 3D Printed Mortar: The Influence of Process Parameters on Interlayer Adhesion","volume":"119","author":"Wolfs","year":"2019","journal-title":"Cem. Concr. Res."},{"key":"ref_5","first-page":"101740","article-title":"An Investigation into the Porosity of Extrusion-Based 3D Printed Mortar","volume":"37","author":"Kruger","year":"2021","journal-title":"Addit. Manuf."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"311","DOI":"10.1016\/j.acme.2017.02.008","article-title":"Fresh and Hardened Properties of 3D Printable Cementitious Materials for Building and Construction","volume":"18","author":"Paul","year":"2018","journal-title":"Arch. Civ. Mech. Eng."},{"key":"ref_7","doi-asserted-by":"crossref","unstructured":"Joh, C., Lee, J., Bui, T.Q., Park, J., and Yang, I.-H. (2020). Buildability and Mechanical Properties of 3D Printed Mortar. Materials, 13.","DOI":"10.3390\/ma13214919"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"586","DOI":"10.1016\/j.conbuildmat.2019.01.235","article-title":"Effects of Layer-Interface Properties on Mechanical Performance of Mortar Elements Produced by Extrusion-Based 3D-Printing","volume":"205","author":"Nerella","year":"2019","journal-title":"Constr. Build. Mater."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"103394","DOI":"10.1016\/j.autcon.2020.103394","article-title":"Bond Properties of Reinforcing Bar Penetrations in 3D Mortar Printing","volume":"120","author":"Marchment","year":"2020","journal-title":"Autom. Constr."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"1597","DOI":"10.1016\/j.istruc.2020.12.061","article-title":"Improving Performance of Additive Manufactured (3D Printed) Mortar: A Review on Material Mix Design, Processing, Interlayer Bonding, and Reinforcing Methods","volume":"29","author":"Navaratnam","year":"2021","journal-title":"Structures"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"341","DOI":"10.1007\/s42107-020-00317-0","article-title":"Inter-Layer Reinforcement of 3D Printed Mortar Elements","volume":"22","author":"Baz","year":"2021","journal-title":"Asian J. Civ. Eng."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"119457","DOI":"10.1016\/j.conbuildmat.2020.119457","article-title":"Mechanical Assessment of Mortar\u2014Steel Bonding in 3D Printed Elements","volume":"256","author":"Baz","year":"2020","journal-title":"Constr. Build. Mater."},{"key":"ref_13","first-page":"101069","article-title":"Effects of Deposition Velocity in the Presence\/Absence of E6-Glass Fibre on Extrusion-Based 3D Printed Mortar","volume":"32","author":"Shakor","year":"2020","journal-title":"Addit. Manuf."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"112808","DOI":"10.1016\/j.compstruct.2020.112808","article-title":"Anisotropic Behavior in Bending of 3D Printed Mortar Reinforced with Fibers","volume":"254","author":"Ding","year":"2020","journal-title":"Compos. Struct."},{"key":"ref_15","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_16","doi-asserted-by":"crossref","first-page":"102992","DOI":"10.1016\/j.autcon.2019.102992","article-title":"Mesh Reinforcing Method for 3D Mortar Printing","volume":"109","author":"Marchment","year":"2020","journal-title":"Autom. Constr."},{"key":"ref_17","doi-asserted-by":"crossref","unstructured":"Shakor, P., Nejadi, S., and Paul, G. (2019). A Study into the Effect of Different Nozzles Shapes and Fibre-Reinforcement in 3D Printed Mortar. Materials, 12.","DOI":"10.3390\/ma12101708"},{"key":"ref_18","doi-asserted-by":"crossref","unstructured":"Hass, L., and Bos, F. (2020, January 6\u20139). Bending and Pull-Out Tests on a Novel Screw Type Reinforcement for Extrusion-Based 3D Printed Mortar. Proceedings of the Second RILEM International Conference on Mortar and Digital Fabrication, Eindhoven, The Netherlands.","DOI":"10.1007\/978-3-030-49916-7_64"},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"144","DOI":"10.1016\/j.matlet.2018.09.159","article-title":"Micro-Cable Reinforced Geopolymer Composite for Extrusion-Based 3D Printing","volume":"235","author":"Ma","year":"2019","journal-title":"Mater. Lett."},{"key":"ref_20","doi-asserted-by":"crossref","unstructured":"Bester, F., van den Heever, M., Kruger, J., Cho, S., and van Zijl, G. (2020, January 6\u20139). Steel Fiber Links in 3D Printed Mortar. Proceedings of the Second RILEM International Conference on Mortar and Digital Fabrication, Eindhoven, The Netherlands.","DOI":"10.1007\/978-3-030-49916-7_41"},{"key":"ref_21","doi-asserted-by":"crossref","unstructured":"Perrot, A., Jacquet, Y., Rangeard, D., Courteille, E., and Sonebi, M. (2020). Nailing of Layers: A Promising Way to Reinforce Mortar 3D Printing Structures. Materials, 13.","DOI":"10.3390\/ma13071518"},{"key":"ref_22","doi-asserted-by":"crossref","unstructured":"Wang, W., Konstantinidis, N., Austin, S., Buswell, R.A., Cavalaro, S., and Cecinia, D. (2020, January 6\u20139). Flexural Behaviour of AR-Glass Textile Reinforced 3D Printed Mortar Beams. Proceedings of the Second RILEM International Conference on Mortar and Digital Fabrication, Eindhoven, The Netherlands.","DOI":"10.1007\/978-3-030-49916-7_73"},{"key":"ref_23","doi-asserted-by":"crossref","unstructured":"Hordijk, D.A., and Lukovi\u0107, M. (2018). 3D Printing Concrete with Reinforcement BT\u2014High Tech Concrete: Where Technology and Engineering Meet, Springer International Publishing.","DOI":"10.1007\/978-3-319-59471-2"},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"414","DOI":"10.1016\/j.conbuildmat.2015.07.035","article-title":"Experimental and Analytical Investigations on the Behavior of Interface between Mortar and Polymer Cement Mortar under Hygrothermal Conditions","volume":"94","author":"Rashid","year":"2015","journal-title":"Constr. Build. Mater."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"106386","DOI":"10.1016\/j.cemconres.2021.106386","article-title":"Investigation of Interlayer Adhesion of 3D Printable Cementitious Material from the Aspect of Printing Process","volume":"143","author":"Weng","year":"2021","journal-title":"Cem. Concr. Res."},{"key":"ref_26","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_27","doi-asserted-by":"crossref","first-page":"950","DOI":"10.1016\/j.conbuildmat.2012.09.055","article-title":"Influence of Organic Thickening Admixtures on the Rheological Properties of Mortars: Relationship with Water-Retention","volume":"38","author":"Cappellari","year":"2013","journal-title":"Constr. Build. Mater."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"171","DOI":"10.1016\/S0958-9465(98)80006-1","article-title":"Viscosity-Enhancing Admixtures for Cement-Based Materials\u2014An Overview","volume":"20","author":"Khayat","year":"1998","journal-title":"Cem. Concr. Compos."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"284","DOI":"10.1016\/j.conbuildmat.2019.05.131","article-title":"Effect of Paste Volume on Fresh and Hardened Properties of Mortar","volume":"218","author":"Chu","year":"2019","journal-title":"Constr. Build. Mater."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"196","DOI":"10.1016\/j.cemconcomp.2018.07.014","article-title":"Roles of Water Film Thickness and Fibre Factor in Workability of Polypropylene Fibre Reinforced Mortar","volume":"93","author":"Li","year":"2018","journal-title":"Cem. Concr. Compos."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"103","DOI":"10.1016\/j.cemconres.2018.02.001","article-title":"Early Age Mechanical Behaviour of 3D Printed Mortar: Numerical Modelling and Experimental Testing","volume":"106","author":"Wolfs","year":"2018","journal-title":"Cem. Concr. Res."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"563","DOI":"10.1016\/j.compositesb.2019.02.040","article-title":"Mechanical Properties and Deformation Behaviour of Early Age Mortar in the Context of Digital","volume":"165","author":"Panda","year":"2019","journal-title":"Constr. Compos. Part B Eng."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"118654","DOI":"10.1016\/j.conbuildmat.2020.118654","article-title":"Mechanical Behavior of 3D Printed Mortar with Recycled Sand at Early Ages","volume":"248","author":"Ding","year":"2020","journal-title":"Constr. Build. Mater."},{"key":"ref_34","doi-asserted-by":"crossref","unstructured":"Chen, Y., Li, Z., Chaves Figueiredo, S., \u00c7opuro\u011flu, O., Veer, F., and Schlangen, E. (2019). Limestone and Calcined Clay-Based Sustainable Cementitious Materials for 3D Mortar Printing: A Fundamental Study of Extrudability and Early-Age Strength Development. Appl. Sci., 9.","DOI":"10.3390\/app9091809"},{"key":"ref_35","unstructured":"American Society for Testing and Materials (ASTM) (2007). Standard Test Method for Compressive Strength of Hydraulic Cement Mortars (Using 2-in. or [50-Mm] Cube Specimens), ASTM International. C109M-07."},{"key":"ref_36","unstructured":"American Society for Testing and Materials (ASTM) (2004). Standard Test Method for Splitting Tensile Strength of Cylindrical Mortar Specimens, ASTM International. C496M\/C 496M-04."},{"key":"ref_37","unstructured":"British Standards Institution (2009). Testing Hardened Concrete. Tensile Splitting Strength of Test Specimens, British Standards Institution. BS EN 12390-6:2009."},{"key":"ref_38","unstructured":"The International Organization for Standardization (2020). Testing of Concrete\u2014Part 4: Strength of Hardened Concrete, ISO (The International Organization for Standardization). ISO 1920-4: 2020."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"1","DOI":"10.17485\/ijst\/2017\/v10i12\/110428","article-title":"Suitability of Ambient-Cured Alccofine Added Low Calcium Fly Ash-Based Geopolymer Concrete","volume":"10","author":"Jindal","year":"2017","journal-title":"Indian J. Sci. Technol."},{"key":"ref_40","unstructured":"American Society for Testing and Materials (ASTM) (2018). Standard Test Method for Flexural Strength of Hydraulic-Cement Mortars, ASTM International. C348-18."},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"781","DOI":"10.1016\/j.cemconcomp.2006.05.018","article-title":"Effect of Water Curing Conditions on the Hydration Degree and Compressive Strengths of Fly Ash\u2013Cement Paste","volume":"28","author":"Termkhajornkit","year":"2006","journal-title":"Cem. Concr. Compos."},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"712","DOI":"10.1016\/j.conbuildmat.2019.07.161","article-title":"Correlation between Pore Characteristics and Tensile Bond Strength of Additive Manufactured Mortar Using X-Ray Computed Tomography","volume":"226","author":"Lee","year":"2019","journal-title":"Constr. Build. Mater."}],"container-title":["Materials"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1996-1944\/14\/21\/6630\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T07:25:26Z","timestamp":1760167526000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1996-1944\/14\/21\/6630"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2021,11,3]]},"references-count":42,"journal-issue":{"issue":"21","published-online":{"date-parts":[[2021,11]]}},"alternative-id":["ma14216630"],"URL":"https:\/\/doi.org\/10.3390\/ma14216630","relation":{},"ISSN":["1996-1944"],"issn-type":[{"value":"1996-1944","type":"electronic"}],"subject":[],"published":{"date-parts":[[2021,11,3]]}}}