{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,24]],"date-time":"2026-04-24T04:35:51Z","timestamp":1777005351768,"version":"3.51.4"},"reference-count":38,"publisher":"MDPI AG","issue":"16","license":[{"start":{"date-parts":[[2021,8,10]],"date-time":"2021-08-10T00:00:00Z","timestamp":1628553600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Strategic Initiative Materials","award":["3D2BGreen"],"award-info":[{"award-number":["3D2BGreen"]}]},{"name":"Flanders agency for innovation &amp; entrepreneurship","award":["3D2BGreen"],"award-info":[{"award-number":["3D2BGreen"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Materials"],"abstract":"<jats:p>Similar to conventional cast concrete, printable materials require reinforcement to counteract their low tensile strength. However, as traditional reinforcement strategies are not commonly used in 3D print applications, fiber reinforcement can serve as an alternative. This study aims to assess the influence of different polypropylene fiber lengths (3 and 6 mm, denoted as M3 and M6, respectively) and dosages (0.1 and 0.3% volume fraction) on the workability, pore structure, mechanical and shrinkage behavior of 3D printable cementitious materials. Fresh state observations revealed that the addition of a higher fiber volume decreased the workability of the material, irrespective of the fiber length as a result of the lower water film thickness (WFT). In hardened state, a marginal increase in total porosity could be observed when adding fibers to the mix composition. In addition, the flexural strength was found to increase with the addition of fibers, while no significant difference was observed in compressive strength. The increase in flexural strength was more pronounced in the case of longer-sized M6 fibers. Finally, the total drying shrinkage behavior was evaluated using mold-cast prisms. The addition of M6 fibers showed no beneficial effect in reducing total free shrinkage, while a reduction in total free shrinkage was observed when using M3 fibers.<\/jats:p>","DOI":"10.3390\/ma14164474","type":"journal-article","created":{"date-parts":[[2021,8,10]],"date-time":"2021-08-10T08:57:14Z","timestamp":1628585834000},"page":"4474","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":40,"title":["Development of 3D Printable Cementitious Composites with the Incorporation of Polypropylene Fibers"],"prefix":"10.3390","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0701-0207","authenticated-orcid":false,"given":"Jolien","family":"Van Der Putten","sequence":"first","affiliation":[{"name":"Magnel-Vandepitte Laboratory, Department of Structural Engineering and Building Materials, Ghent University, 9052 Ghent, Belgium"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5849-2293","authenticated-orcid":false,"given":"Attupurathu Vijayan","family":"Rahul","sequence":"additional","affiliation":[{"name":"Magnel-Vandepitte Laboratory, Department of Structural Engineering and Building Materials, Ghent University, 9052 Ghent, Belgium"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5603-2616","authenticated-orcid":false,"given":"Geert","family":"De Schutter","sequence":"additional","affiliation":[{"name":"Magnel-Vandepitte Laboratory, Department of Structural Engineering and Building Materials, Ghent University, 9052 Ghent, Belgium"}]},{"given":"Kim","family":"Van Tittelboom","sequence":"additional","affiliation":[{"name":"Magnel-Vandepitte Laboratory, Department of Structural Engineering and Building Materials, Ghent University, 9052 Ghent, Belgium"}]}],"member":"1968","published-online":{"date-parts":[[2021,8,10]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"262","DOI":"10.1016\/j.autcon.2011.06.010","article-title":"Developments in construction-scale additive manufacturing processes","volume":"21","author":"Lim","year":"2012","journal-title":"Autom. Constr."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"103855","DOI":"10.1016\/j.cemconcomp.2020.103855","article-title":"Extrusion-based concrete 3D printing from a material perspective: A state-of-the-art review","volume":"115","author":"Mohan","year":"2021","journal-title":"Cem. Concr. Compos."},{"key":"ref_3","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_4","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_5","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_6","doi-asserted-by":"crossref","first-page":"770","DOI":"10.1016\/j.conbuildmat.2019.01.008","article-title":"Mechanical anisotropy of aligned fiber reinforced composite for extrusion-based 3D printing","volume":"202","author":"Ma","year":"2019","journal-title":"Constr. Build. Mater."},{"key":"ref_7","first-page":"101617","article-title":"Development of extrudable high strength fiber reinforced concrete incorporating nano calcium carbonate","volume":"37","author":"Chu","year":"2021","journal-title":"Addit. Manuf."},{"key":"ref_8","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_9","doi-asserted-by":"crossref","first-page":"107651","DOI":"10.1016\/j.matdes.2019.107651","article-title":"An approach to develop printable strain hardening cementitious composites","volume":"169","author":"Figueiredo","year":"2019","journal-title":"Mater. Des."},{"key":"ref_10","doi-asserted-by":"crossref","unstructured":"Ogura, H., Nerella, V.N., 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_11","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_12","doi-asserted-by":"crossref","first-page":"108088","DOI":"10.1016\/j.matdes.2019.108088","article-title":"Development of 3D printable engineered cementitious composites with ultra-high tensile ductility for digital construction","volume":"181","author":"Zhu","year":"2019","journal-title":"Mater. Des."},{"key":"ref_13","first-page":"443","article-title":"Influence of fiber reinforcement on restrained shrinkage and cracking","volume":"76","author":"Swamy","year":"1979","journal-title":"J. Proc."},{"key":"ref_14","first-page":"139","article-title":"Effect of fiber addition on the autogenous shrinkage of silica fume","volume":"86","author":"Paillere","year":"1989","journal-title":"Mater. J."},{"key":"ref_15","first-page":"553","article-title":"Plastic shrinkage cracking of polypropylene fiber reinforced concrete","volume":"92","author":"Soroushian","year":"1993","journal-title":"Mater. J."},{"key":"ref_16","first-page":"309","article-title":"Shrinkage cracking and durability characteristics of cellulose fiber reinforced concrete","volume":"90","author":"Sargaphuti","year":"1993","journal-title":"Mater. J."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"1263","DOI":"10.1016\/j.cemconres.2006.01.010","article-title":"Influence of polypropylene fiber geometry on plastic shrinkage cracking in concrete","volume":"36","author":"Banthia","year":"2006","journal-title":"Cem. Concr. Res."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"226","DOI":"10.1016\/j.cemconres.2009.08.032","article-title":"Rheology of fiber reinforced cementitious materials: Classification and prediction","volume":"40","author":"Martinie","year":"2010","journal-title":"Cem. Concr. Res."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"106221","DOI":"10.1016\/j.cemconres.2020.106221","article-title":"Influence of flexible fibers on the yield stress of fresh cement pastes and mortars","volume":"138","author":"Sultangaliyeva","year":"2020","journal-title":"Cem. Concr. Res."},{"key":"ref_20","unstructured":"NBN (2000). Cement-Part 1: Composition, Specifications and Conformity Criteria for Common Cements, Belgisch Instituut voor Normalisatie. NBN EN 197-1."},{"key":"ref_21","unstructured":"British Standards Institution (2000). BS EN 15167-2:2018: Cement-Part 1: Ground Granulated Blast Furnace Slag for Use in Concrete, Mortar and Grout\u2014Part 2: Conformity Evaluation, 2018, British Standards Institution (BSI)."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"106258","DOI":"10.1016\/j.cemconres.2020.106258","article-title":"Rheological and pumping behaviour of 3D printable cementitious materials with varying aggregate content","volume":"139","author":"Mohan","year":"2021","journal-title":"Cem. Concr. Res."},{"key":"ref_23","unstructured":"ASTM (2020). Standard Test Method for Flow of Hydraulic Cement Mortar, American Society for Testing and Materials. ASTM C1437-20."},{"key":"ref_24","doi-asserted-by":"crossref","unstructured":"Van Der Putten, J., Deprez, M., Cnudde, V., De Schutter, G., and Van Tittelboom, K. (2019). Microstructural Characterization of 3D Printed Cementitious Materials. Materials, 12.","DOI":"10.3390\/ma12182993"},{"key":"ref_25","unstructured":"NBN (1974). Proeven op Beton: Krimpen en Zwellen, Belgisch Instituut voor Normalisatie. NBN B15-216."},{"key":"ref_26","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_27","doi-asserted-by":"crossref","first-page":"121278","DOI":"10.1016\/j.conbuildmat.2020.121278","article-title":"Carbon fiber reinforced geopolymer (FRG) mix design based on liquid film thickness","volume":"269","author":"Chu","year":"2021","journal-title":"Constr. Build. Mater."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"116857","DOI":"10.1016\/j.conbuildmat.2019.116857","article-title":"Basalt fibre-reinforced mortar: Rheology modelling based on water film thickness and fibre content","volume":"229","author":"Li","year":"2019","journal-title":"Constr. Build. Mater."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"433","DOI":"10.1016\/j.powtec.2018.10.005","article-title":"Packing density of mortar containing polypropylene, carbon or basalt fibres under dry and wet conditions","volume":"342","author":"Li","year":"2019","journal-title":"Powder Technol."},{"key":"ref_30","doi-asserted-by":"crossref","unstructured":"Nematollahi, B., Vijay, P., Sanjayan, J., Nazari, A., Xia, M., Nerella, V.N., and Mechtcherine, V. (2018). Effect of Polypropylene Fibre Addition on Properties of Geopolymers Made by 3D Printing for Digital Construction. Materials, 11.","DOI":"10.3390\/ma11122352"},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"155","DOI":"10.1016\/S0008-8846(02)00942-0","article-title":"Porosity, pore size distribution and in situ strength of concrete","volume":"33","author":"Kumar","year":"2003","journal-title":"Cem. Concr. Res."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"382","DOI":"10.1016\/j.conbuildmat.2011.08.055","article-title":"Implication of pore size distribution parameters on compressive strength, permeability and hydraulic diffusivity of concrete","volume":"28","author":"Das","year":"2012","journal-title":"Constr. Build. Mater."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"277","DOI":"10.1016\/S0008-8846(00)00474-9","article-title":"Permeability and pore structure of OPC paste","volume":"31","author":"Cui","year":"2001","journal-title":"Cem. Concr. Res."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"1120","DOI":"10.1016\/j.cemconres.2010.02.011","article-title":"Characterization of pore structure in cement-based materials using pressurization\u2013depressurization cycling mercury intrusion porosimetry (PDC-MIP)","volume":"40","author":"Zhou","year":"2010","journal-title":"Cem. Concr. Res."},{"key":"ref_35","first-page":"126","article-title":"Fiber Reinforced Concrete Properties","volume":"68","author":"Surendra","year":"1971","journal-title":"ACI J. Proc."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"486","DOI":"10.1007\/BF02472808","article-title":"Micromechanics of crack bridging in fibre-reinforced concrete","volume":"26","author":"Li","year":"1993","journal-title":"Mater. Struct."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"660","DOI":"10.1002\/app.2263","article-title":"Large Volume, High-Performance Applications of Fibers in Civil Engineering","volume":"83","author":"Li","year":"2002","journal-title":"J. Appl. Polym. Sci."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"137","DOI":"10.1016\/j.cemconcomp.2018.10.016","article-title":"Assessment of behaviour and cracking susceptibility of cementitious systems under restrained conditions through ring tests: A critical review","volume":"95","author":"Kanavaris","year":"2019","journal-title":"Cem. Concr. Compos."}],"container-title":["Materials"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1996-1944\/14\/16\/4474\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T06:43:21Z","timestamp":1760165001000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1996-1944\/14\/16\/4474"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2021,8,10]]},"references-count":38,"journal-issue":{"issue":"16","published-online":{"date-parts":[[2021,8]]}},"alternative-id":["ma14164474"],"URL":"https:\/\/doi.org\/10.3390\/ma14164474","relation":{},"ISSN":["1996-1944"],"issn-type":[{"value":"1996-1944","type":"electronic"}],"subject":[],"published":{"date-parts":[[2021,8,10]]}}}