{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,27]],"date-time":"2026-03-27T07:25:14Z","timestamp":1774596314676,"version":"3.50.1"},"reference-count":48,"publisher":"MDPI AG","issue":"1","license":[{"start":{"date-parts":[[2025,1,7]],"date-time":"2025-01-07T00:00:00Z","timestamp":1736208000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Natural Science Foundation of Shanghai","award":["24ZR1453700"],"award-info":[{"award-number":["24ZR1453700"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Coatings"],"abstract":"<jats:p>Addressing the challenge of weak interface strength in 3D-printed mortars, this study introduces a novel technique using sinuous printing trajectories. The self-locking interface is formed by different meandering print trajectories, and the changes in the strength of the test interface are investigated by adjusting the trajectories to form different amplitudes. This ensures alignment of peaks and troughs between layers, aiming for enhanced interfacial cohesion. Experimental tests measured mechanical properties of printed mortar specimens with varying amplitudes. Using Digital Image Correlation technology, strain fields and fracture surfaces were analyzed. Initial results revealed a 28% decrease in shear resistance for side-by-side printed interfaces compared to traditional layered interfaces. As amplitude increased, shear load-bearing capacity improved. Specifically, a 15 mm amplitude saw a 40% rise in interlayer shear strength. However, a 20 mm amplitude led to reduced shear capacity, with even slight forces causing potential fractures. Tensile strength also increased with amplitude. Specimens up to 15 mm amplitude primarily followed the printing interface in fractures, while a 20 mm amplitude cut through mortar strips. Post-fracture analysis showed the highest surface irregularity at a 15 mm amplitude, aligning with tensile load-bearing capacity.<\/jats:p>","DOI":"10.3390\/coatings15010058","type":"journal-article","created":{"date-parts":[[2025,1,7]],"date-time":"2025-01-07T05:06:34Z","timestamp":1736226394000},"page":"58","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Interlayer Shear Strength and Bonding Strength of Sinuous 3D-Printed Mortar"],"prefix":"10.3390","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1650-2542","authenticated-orcid":false,"given":"Qiong","family":"Liu","sequence":"first","affiliation":[{"name":"School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China"}]},{"given":"Qiming","family":"Wang","sequence":"additional","affiliation":[{"name":"School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China"}]},{"given":"Chang","family":"Sun","sequence":"additional","affiliation":[{"name":"School of Civil Engineering and Architecture, Changzhou Institute of Technology, Changzhou 213032, China"}]},{"given":"Jiawang","family":"Li","sequence":"additional","affiliation":[{"name":"School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0084-808X","authenticated-orcid":false,"given":"Amardeep","family":"Singh","sequence":"additional","affiliation":[{"name":"School of Civil Engineering and Architecture, Changzhou Institute of Technology, Changzhou 213032, China"}]}],"member":"1968","published-online":{"date-parts":[[2025,1,7]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"105533","DOI":"10.1016\/j.compositesa.2019.105533","article-title":"A Review of the Current Progress and Application of 3D Printed Concrete","volume":"125","author":"Zhang","year":"2019","journal-title":"Compos. Part A Appl. Sci. Manuf."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"121745","DOI":"10.1016\/j.conbuildmat.2020.121745","article-title":"A Review of 3D Printed Concrete: Performance Requirements, Testing Measurements and Mix Design","volume":"273","author":"Hou","year":"2021","journal-title":"Constr. Build. Mater."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"129763","DOI":"10.1016\/j.conbuildmat.2022.129763","article-title":"Enhancement of 3D Printed Cementitious Composite by Short Fibers: A Review","volume":"362","author":"Zhou","year":"2023","journal-title":"Constr. Build. Mater."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"1597","DOI":"10.1016\/j.istruc.2020.12.061","article-title":"Improving Performance of Additive Manufactured (3D Printed) Concrete: A Review on Material Mix Design, Processing, Interlayer Bonding, and Reinforcing Methods","volume":"29","author":"Navaratnam","year":"2021","journal-title":"Structures"},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"125312","DOI":"10.1016\/j.conbuildmat.2021.125312","article-title":"On Rheology of Mortar with Recycled Fine Aggregate for 3D Printing","volume":"311","author":"Zou","year":"2021","journal-title":"Constr. Build. Mater."},{"key":"ref_6","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."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"121699","DOI":"10.1016\/j.conbuildmat.2020.121699","article-title":"Printability and Advantages of 3D Printing Mortar with 100% Recycled Sand","volume":"273","author":"Zou","year":"2021","journal-title":"Constr. Build. Mater."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"126616","DOI":"10.1016\/j.conbuildmat.2022.126616","article-title":"Mechanical and Macrostructural Properties of 3D Printed Concrete Dosed with Steel Fibers under Different Loading Direction","volume":"323","author":"Singh","year":"2022","journal-title":"Constr. Build. Mater."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"120991","DOI":"10.1016\/j.conbuildmat.2020.120991","article-title":"Mechanical Properties of 3D Printed Concrete in Hot Temperatures","volume":"266","author":"Alchaar","year":"2021","journal-title":"Constr. Build. Mater."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"116710","DOI":"10.1016\/j.conbuildmat.2019.116710","article-title":"Mechanical Characterization of 3D Printable Concrete","volume":"227","author":"Rahul","year":"2019","journal-title":"Constr. Build. Mater."},{"key":"ref_11","first-page":"101390","article-title":"Effects of Interlayer Notch and Shear Stress on Interlayer Strength of 3D Printed Cement Paste","volume":"36","author":"He","year":"2020","journal-title":"Addit. Manuf."},{"key":"ref_12","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_13","doi-asserted-by":"crossref","first-page":"120559","DOI":"10.1016\/j.conbuildmat.2020.120559","article-title":"Examining the Significance of Infill Printing Pattern on the Anisotropy of 3D Printed Concrete","volume":"262","author":"Genedy","year":"2020","journal-title":"Constr. Build. Mater."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"123524","DOI":"10.1016\/j.conbuildmat.2021.123524","article-title":"Mechanical and Microstructural Evolution of 3D Printed Concrete with Polyethylene Fiber and Recycled Sand at Elevated Temperatures","volume":"293","author":"Xiao","year":"2021","journal-title":"Constr. Build. Mater."},{"key":"ref_15","first-page":"101712","article-title":"Finite Element Analysis on the Anisotropic Behavior of 3D Printed Concrete under Compression and Flexure","volume":"39","author":"Xiao","year":"2021","journal-title":"Addit. Manuf."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"104704","DOI":"10.1016\/j.cemconcomp.2022.104704","article-title":"Time-Dependent Fresh Properties Characterization of 3D Printing Engineered Cementitious Composites (3DP-ECC): On the Evaluation of Buildability","volume":"133","author":"Zhou","year":"2022","journal-title":"Cem. Concr. Compos."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"127685","DOI":"10.1016\/j.conbuildmat.2022.127685","article-title":"Effect of FA and GGBFS on Compressive Strength, Rheology, and Printing Properties of Cement-Based 3D Printing Material","volume":"339","author":"Xu","year":"2022","journal-title":"Constr. Build. Mater."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"110681","DOI":"10.1016\/j.matdes.2022.110681","article-title":"D-Optimal Design of Experiments Applied to 3D High-Performance Concrete Printing Mix Design","volume":"218","author":"Sergis","year":"2022","journal-title":"Mater. Des."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"128808","DOI":"10.1016\/j.conbuildmat.2022.128808","article-title":"Effect of Metakaolin on the Fresh and Hardened Properties of 3D Printed Cementitious Composite","volume":"350","author":"Duan","year":"2022","journal-title":"Constr. Build. Mater."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"129561","DOI":"10.1016\/j.conbuildmat.2022.129561","article-title":"Development of an Analytical Framework for Evaluation of Critical Fiber Length in Asphalt Concrete with a Fiber Pullout Test","volume":"360","author":"Noorvand","year":"2022","journal-title":"Constr. Build. Mater."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"129684","DOI":"10.1016\/j.conbuildmat.2022.129684","article-title":"Hardened Fracture Characteristics of Printed Concrete Using Acoustic Emission Monitoring Technique","volume":"361","author":"Yue","year":"2022","journal-title":"Constr. Build. Mater."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"103546","DOI":"10.1016\/j.autcon.2020.103546","article-title":"Synchronized Concrete and Bonding Agent Deposition System for Interlayer Bond Strength Enhancement in 3D Concrete Printing","volume":"123","author":"Weng","year":"2021","journal-title":"Autom. Constr."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"106078","DOI":"10.1016\/j.cemconres.2020.106078","article-title":"Influence of Process Parameters on the Interlayer Bond Strength of Concrete Elements Additive Manufactured by Shotcrete 3D Printing (SC3DP)","volume":"134","author":"Kloft","year":"2020","journal-title":"Cem. Concr. Res."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"132765","DOI":"10.1016\/j.matlet.2022.132765","article-title":"Utilization Potential of Steel Fibers in 3D Printed Functionally Graded Cementitious Composite: An Experimental Approach","volume":"324","author":"Singh","year":"2022","journal-title":"Mater. Lett."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"120786","DOI":"10.1016\/j.conbuildmat.2020.120786","article-title":"Effect of Microwave Heating on Interlayer Bonding and Buildability of Geopolymer 3D Concrete Printing","volume":"265","author":"Muthukrishnan","year":"2020","journal-title":"Constr. Build. Mater."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"103860","DOI":"10.1016\/j.jobe.2021.103860","article-title":"Shear Performance of 3D Printed Concrete Reinforced with Flexible or Rigid Materials Based on Direct Shear Test","volume":"48","author":"Sun","year":"2022","journal-title":"J. Build. Eng."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"127827","DOI":"10.1016\/j.conbuildmat.2022.127827","article-title":"Bonding Strength of Steel Rebars Perpendicular to the Hardened 3D-Printed Concrete Layers","volume":"340","author":"Aramburu","year":"2022","journal-title":"Constr. Build. Mater."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"103571","DOI":"10.1016\/j.cemconcomp.2020.103571","article-title":"Interlayer Bonding Improvement of 3D Printed Concrete with Polymer Modified Mortar: Experiments and Molecular Dynamics Studies","volume":"110","author":"Wang","year":"2020","journal-title":"Cem. Concr. Compos."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"106535","DOI":"10.1016\/j.cemconres.2021.106535","article-title":"Interlayer Reinforcement of 3D Printed Concrete by the In-Process Deposition of U-Nails","volume":"148","author":"Wang","year":"2021","journal-title":"Cem. Concr. Res."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"104316","DOI":"10.1016\/j.ijimpeng.2022.104316","article-title":"Explosion Resistance of 3D Printing Ultra-High Performance Concrete Based on Contact Explosion Tests","volume":"169","author":"Ma","year":"2022","journal-title":"Int. J. Impact Eng."},{"key":"ref_31","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_32","doi-asserted-by":"crossref","unstructured":"Panda, B., Mohamed, N.A.N., Paul, S.C., Singh, G.V.P.B., Tan, M.J., and \u0160avija, B. (2019). The Effect of Material Fresh Properties and Process Parameters on Buildability and Interlayer Adhesion of 3D Printed Concrete. Materials, 12.","DOI":"10.3390\/ma12132149"},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"261","DOI":"10.1016\/j.jmatprotec.2019.04.007","article-title":"Effect of Printing Parameters in 3D Concrete Printing: Printing Region and Support Structures","volume":"271","author":"Tay","year":"2019","journal-title":"J. Mater. Process Technol."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"120094","DOI":"10.1016\/j.conbuildmat.2020.120094","article-title":"Effect of Printing Parameters on Interlayer Bond Strength of 3D Printed Limestone-Calcined Clay-Based Cementitious Materials: An Experimental and Numerical Study","volume":"262","author":"Chen","year":"2020","journal-title":"Constr. Build. Mater."},{"key":"ref_35","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_36","doi-asserted-by":"crossref","first-page":"104594","DOI":"10.1016\/j.cemconcomp.2022.104594","article-title":"Influence of Aluminum Sulfate on Mobility and Adhesion of Hydroxyethyl Methyl Cellulose in Cement-Based Materials for Tunnel Linings","volume":"131","author":"Tao","year":"2022","journal-title":"Cem. Concr. Compos."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"178","DOI":"10.1016\/j.cemconcomp.2017.11.005","article-title":"Application of 3D-DIC to Characterize the Effect of Aggregate Size and Volume on Non-Uniform Shrinkage Strain Distribution in Concrete","volume":"86","author":"Chen","year":"2018","journal-title":"Cem. Concr. Compos."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"105761","DOI":"10.1016\/j.cemconres.2019.05.006","article-title":"Quantification of Plastic Shrinkage Cracking in Mortars Using Digital Image Correlation","volume":"123","author":"Bertelsen","year":"2019","journal-title":"Cem. Concr. Res."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"125572","DOI":"10.1016\/j.conbuildmat.2021.125572","article-title":"Analysis of the Mechanical Performance and Damage Mechanism for 3D Printed Concrete Based on Pore Structure","volume":"314","author":"Liu","year":"2022","journal-title":"Constr. Build. Mater."},{"key":"ref_40","first-page":"101992","article-title":"Bonding Performance of 3D Printing Concrete with Self-Locking Interfaces Exposed to Compression\u2013Shear and Compression\u2013Splitting Stresses","volume":"42","author":"Wang","year":"2021","journal-title":"Addit. Manuf."},{"key":"ref_41","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_42","doi-asserted-by":"crossref","first-page":"128720","DOI":"10.1016\/j.jclepro.2021.128720","article-title":"Fiber-Reinforced Mortar with 100% Recycled Fine Aggregates: A Cleaner Perspective on 3D Printing","volume":"319","author":"Xiao","year":"2021","journal-title":"J. Clean. Prod."},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"330","DOI":"10.1016\/j.istruc.2021.01.071","article-title":"Experimental Study on Mechanical Properties and Damage Mechanism of Basalt Fiber Reinforced Concrete under Uniaxial Compression","volume":"31","author":"Yang","year":"2021","journal-title":"Structures"},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"118305","DOI":"10.1016\/j.conbuildmat.2020.118305","article-title":"A Novel Additive Mortar Leveraging Internal Curing for Enhancing Interlayer Bonding of Cementitious Composite for 3D Printing","volume":"244","author":"Ma","year":"2020","journal-title":"Constr. Build. Mater."},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"112808","DOI":"10.1016\/j.compstruct.2020.112808","article-title":"Anisotropic Behavior in Bending of 3D Printed Concrete Reinforced with Fibers","volume":"254","author":"Ding","year":"2020","journal-title":"Compos. Struct."},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"123077","DOI":"10.1016\/j.conbuildmat.2021.123077","article-title":"Flexural Properties of 3D Printed Fibre-Reinforced Concrete with Recycled Sand","volume":"288","author":"Ding","year":"2021","journal-title":"Constr. Build. Mater."},{"key":"ref_47","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_48","doi-asserted-by":"crossref","first-page":"113486","DOI":"10.1016\/j.engstruct.2021.113486","article-title":"Refined Extraction of Crack Characteristics in Large-Scale Concrete Experiments Based on Digital Image Correlation","volume":"251","author":"Gehri","year":"2022","journal-title":"Eng. Struct."}],"container-title":["Coatings"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2079-6412\/15\/1\/58\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,8]],"date-time":"2025-10-08T10:24:05Z","timestamp":1759919045000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2079-6412\/15\/1\/58"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2025,1,7]]},"references-count":48,"journal-issue":{"issue":"1","published-online":{"date-parts":[[2025,1]]}},"alternative-id":["coatings15010058"],"URL":"https:\/\/doi.org\/10.3390\/coatings15010058","relation":{},"ISSN":["2079-6412"],"issn-type":[{"value":"2079-6412","type":"electronic"}],"subject":[],"published":{"date-parts":[[2025,1,7]]}}}