{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,26]],"date-time":"2026-02-26T15:58:34Z","timestamp":1772121514506,"version":"3.50.1"},"reference-count":38,"publisher":"MDPI AG","issue":"5","license":[{"start":{"date-parts":[[2026,2,26]],"date-time":"2026-02-26T00:00:00Z","timestamp":1772064000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"UK International Development under the United Kingdom Government\u2019s \u2018Innovate Ukraine\u2019 program"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Materials"],"abstract":"<jats:p>The paper presents the results of a study focused on technological parameters that ensure the effectiveness of using concrete powders obtained from crushed concrete waste as an active mineral additive in construction mixtures used for 3D printing. The efficiency of using a complex polyfunctional additive to cement pastes and mortars based on it is experimentally demonstrated. This additive includes a naphthalene\u2013formaldehyde-based superplasticizer and a water-retaining additive, hydroxyethyl methylcellulose. Using the mathematical experiment planning methodology, polynomial models of the cement pastes and mortars\u2019 mechanical properties were obtained. The models showed a positive effect of the complex additive on the cement pastes\u2019 normal consistency and viscosity. Additionally, the results of the study demonstrate the possibility of regulating the cement pastes\u2019 setting time and the plastic strength of mortars based on them using a complex additive. Analysis of the experimental\u2013statistical models shows that using the complex additive allows regulation of water separation as well as the compressive and flexural strength of cement\u2013sand mortars based on the investigated cement pastes within the required limits. Improving the key properties of building mixtures containing crushed concrete waste for 3D printing using complex polyfunctional modifier additives opens up new opportunities for increasing their economic and environmental efficiency.<\/jats:p>","DOI":"10.3390\/ma19050877","type":"journal-article","created":{"date-parts":[[2026,2,26]],"date-time":"2026-02-26T14:51:29Z","timestamp":1772117489000},"page":"877","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Modifying the Properties of Construction Mixtures Containing Crushed Concrete Waste for 3D Printing"],"prefix":"10.3390","volume":"19","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0999-0402","authenticated-orcid":false,"given":"Vitaliy","family":"Marchuk","sequence":"first","affiliation":[{"name":"Institute of Civil Engineering and Architecture, National University of Water and Environmental Engineering, 33028 Rivne, Ukraine"}]},{"given":"Ruslan","family":"Makarenko","sequence":"additional","affiliation":[{"name":"Institute of Civil Engineering and Architecture, National University of Water and Environmental Engineering, 33028 Rivne, Ukraine"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8759-6318","authenticated-orcid":false,"given":"Leonid","family":"Dvorkin","sequence":"additional","affiliation":[{"name":"Institute of Civil Engineering and Architecture, National University of Water and Environmental Engineering, 33028 Rivne, Ukraine"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2806-1422","authenticated-orcid":false,"given":"Yuri","family":"Ribakov","sequence":"additional","affiliation":[{"name":"Department of Civil Engineering, Ariel University, Ariel 40700, Israel"}]}],"member":"1968","published-online":{"date-parts":[[2026,2,26]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"168295","DOI":"10.1016\/j.scitotenv.2023.168295","article-title":"Environmental and socio-economic effects of construction and demolition waste recycling in the European Union","volume":"908","author":"Caro","year":"2024","journal-title":"Sci. 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