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Ten mixtures containing polypropylene fiber in three different lengths (3, 6, and 12\u2009mm) and ratios (0.2%, 0.4%, and 0.6%) were prepared. Rheological properties, compressive strength, three\u2010point flexural strength, and drying\u2010shrinkage performance of 3D printable concrete mixtures were examined in this study. Strength properties were determined by perpendicular and lateral loading. Thixotropic properties of the mixtures were determined using three different approaches (structural build\u2010up development, hysteresis area and dynamic structural build\u2010up). The dynamic yield stress value increased with fiber addition up to 0.4% of the total volume. It was determined that this value decreases with the use of fiber above this rate. In terms of mechanical and dimensional stability properties of 3D printable concrete, the optimum fiber length and utilization ratio were 6\u2009mm and 0.4%, respectively. This parameters were adversely affected when fiber utilization ratio was 0.6% and length was 12\u2009mm. Also, there is a strong correlation between structural build\u2010up development and dynamic structural build\u2010up.<\/jats:p>","DOI":"10.1002\/suco.202400030","type":"journal-article","created":{"date-parts":[[2024,8,9]],"date-time":"2024-08-09T08:32:13Z","timestamp":1723192333000},"page":"1597-1612","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Mechanical and rheological properties of fiber\u2010reinforced\n                    <scp>3D<\/scp>\n                    printable concrete; in terms of fiber content and aspect ratio"],"prefix":"10.1002","volume":"26","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8915-879X","authenticated-orcid":false,"given":"Hatice Gizem","family":"\u015eahin","sequence":"first","affiliation":[{"name":"Department of Civil Engineering Bursa Uludag University  Nilufer\u2010Bursa Turkey"}]},{"ORCID":"https:\/\/orcid.org\/0009-0002-6037-1105","authenticated-orcid":false,"given":"Fatih Eren","family":"Akg\u00fcm\u00fc\u015f","sequence":"additional","affiliation":[{"name":"Department of Civil Engineering Bursa Uludag University  Nilufer\u2010Bursa Turkey"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0326-5015","authenticated-orcid":false,"given":"Ali","family":"Mardani","sequence":"additional","affiliation":[{"name":"Department of Civil Engineering Bursa Uludag University  Nilufer\u2010Bursa Turkey"}]}],"member":"311","published-online":{"date-parts":[[2024,8,9]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.compositesb.2018.02.012"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.compositesa.2019.105533"},{"key":"e_1_2_8_4_1","first-page":"1","article-title":"How does rheological behaviour affect the interlayer\u2010bonding strength of 3DPC mixtures?","volume":"38","author":"\u015eahin 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