{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,9]],"date-time":"2026-06-09T13:46:20Z","timestamp":1781012780160,"version":"3.54.1"},"reference-count":48,"publisher":"MDPI AG","issue":"4","license":[{"start":{"date-parts":[[2026,2,23]],"date-time":"2026-02-23T00:00:00Z","timestamp":1771804800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Bursa Uludag University Scientific Research Projects Unit","award":["FBG-2025-2550"],"award-info":[{"award-number":["FBG-2025-2550"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Polymers"],"abstract":"<jats:p>The accumulation of plastic waste represents a significant environmental challenge worldwide, and its reuse in construction materials offers a sustainable management alternative. This study investigates the use of recycled high-density polyethylene (HDPE) and polypropylene (PP) granules as partial volumetric replacements (10%, 20%, and 30%) for limestone aggregate in mortar mixtures. A total of seven mixtures were produced and evaluated in terms of flow value, unit weight, water absorption, porosity, compressive strength, flexural strength, and capillary water absorption. In comparison to the control mixture, it was found that the use of plastic aggregate improved the workability. It was found that the flexural and compressive strengths of mixtures decrease when plastic aggregate is added. Additionally, it was understood that utilization of plastic aggregate in mixtures caused an increase in water absorption rate and porosity values. HDPE and PP plastic aggregates increased flow by 9% to 13% and reduced unit weight by 15 to 15.3%, while compressive and flexural strengths decreased by 48 to 30% and 46 to 54%, respectively. The optimum replacement level was 10% for both HDPE and PP mixtures.<\/jats:p>","DOI":"10.3390\/polym18040542","type":"journal-article","created":{"date-parts":[[2026,2,23]],"date-time":"2026-02-23T14:05:11Z","timestamp":1771855511000},"page":"542","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Investigation Using Granular Material Obtained from High-Density Polyethylene and Polypropylene Plastic Waste as Aggregate in Cementitious Systems"],"prefix":"10.3390","volume":"18","author":[{"given":"\u015eemsi","family":"Yaz\u0131c\u0131","sequence":"first","affiliation":[{"name":"Civil Engineering Department, Ege University, \u0130zmir 35100, T\u00fcrkiye"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"G\u00f6ksu","family":"P\u0131ls\u0131m","sequence":"additional","affiliation":[{"name":"Civil Engineering Department, Ege University, \u0130zmir 35100, T\u00fcrkiye"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8915-879X","authenticated-orcid":false,"given":"Hatice Gizem","family":"\u015eahin","sequence":"additional","affiliation":[{"name":"Civil Engineering Department, Bursa Uludag University, Nil\u00fcfer-Bursa 16059, T\u00fcrkiye"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1330-1860","authenticated-orcid":false,"given":"Demet","family":"Yavuz","sequence":"additional","affiliation":[{"name":"Civil Engineering Department, Y\u00fcz\u00fcnc\u00fc Y\u0131l University, Van 65080, T\u00fcrkiye"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0326-5015","authenticated-orcid":false,"given":"Ali","family":"Mardani","sequence":"additional","affiliation":[{"name":"Civil Engineering Department, Bursa Uludag University, Nil\u00fcfer-Bursa 16059, T\u00fcrkiye"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,2,23]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"129","DOI":"10.1099\/mic.0.000749","article-title":"Plastic waste as a global challenge: Are biodegradable plastics the answer to the plastic waste problem?","volume":"165","author":"Narancic","year":"2019","journal-title":"Microbiology"},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Chow, C.F., So, W.M.W., Cheung, T.Y., and Yeung, S.K.D. (2017). Plastic waste problem and education for plastic waste management. Emerging Practices in Scholarship of Learning and Teaching in a Digital Era, Springer.","DOI":"10.1007\/978-981-10-3344-5_8"},{"key":"ref_3","first-page":"753","article-title":"Plastic waste as a global problem","volume":"48","year":"2021","journal-title":"Knowl. Int. J."},{"key":"ref_4","doi-asserted-by":"crossref","unstructured":"Royer, S.J., Ferr\u00f3n, S., Wilson, S.T., and Karl, D.M. (2018). Production of methane and ethylene from plastic in the environment. PLoS ONE, 13.","DOI":"10.1371\/journal.pone.0200574"},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"105136","DOI":"10.1016\/j.supflu.2020.105136","article-title":"Hydrothermal decomposition of polyethylene waste to hydrocarbons rich oil","volume":"169","author":"Kotnik","year":"2021","journal-title":"J. Supercrit. Fluids"},{"key":"ref_6","first-page":"59","article-title":"Green plastics: An emerging alternative for petroleum-based plastics","volume":"3","author":"Kuruppalil","year":"2011","journal-title":"Int. J. Eng. Res. Innov."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"1111","DOI":"10.46488\/NEPT.2023.v22i03.003","article-title":"Petroleum-Based Plastics Versus Bio-Based Plastics: A Review","volume":"22","author":"Kumari","year":"2023","journal-title":"Nature Environment & Pollution Technology"},{"key":"ref_8","unstructured":"Ak\u00e7a\u00f6zo\u011flu, S. (2008). An Investigation Using Waste Pet Bottles as Aggregate in Lightweight Mortars. [Ph.D. Thesis, \u00c7ukurova University Institute of Science and Technology]."},{"key":"ref_9","first-page":"1647","article-title":"Recycling of sewage sludge incineration ashes as construction material","volume":"35","year":"2020","journal-title":"J. Fac. Eng. Archit. Gazi Univ."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"20","DOI":"10.3992\/1943-4618.13.2.20","article-title":"Durability performance and dimensional stability of polypropylene fiber reinforced concrete","volume":"13","author":"Altun","year":"2018","journal-title":"J. Green. Build."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"289","DOI":"10.1617\/s11527-014-0497-y","article-title":"Influence of water\/powder ratio and powder type on alkali\u2013silica reactivity and transport properties of self-consolidating concrete","volume":"49","author":"Beglarigale","year":"2016","journal-title":"Mater. Struct."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"33","DOI":"10.1007\/s10965-021-02884-5","article-title":"Polycarboxylate-based water reducing admixture\u2013clay compatibility; literature review","volume":"29","author":"Biricik","year":"2022","journal-title":"J. Polym. Res."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"473","DOI":"10.1016\/j.jclepro.2015.08.042","article-title":"Use of different forms of waste plastic in concrete\u2013a review","volume":"112","author":"Sharma","year":"2016","journal-title":"J. Clean. Prod."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"2041","DOI":"10.1016\/j.wasman.2007.08.023","article-title":"Use of waste plastic in concrete mixture as aggregate replacement","volume":"28","author":"Ismail","year":"2008","journal-title":"Waste Manag."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"1835","DOI":"10.1016\/j.wasman.2007.09.011","article-title":"Use of recycled plastic in concrete: A review","volume":"28","author":"Siddique","year":"2008","journal-title":"Waste Manag."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"115","DOI":"10.22161\/ijaers\/3.12.23","article-title":"Use of waste plastic in concrete mixture as aggregate replacement","volume":"3","author":"Sambhaji","year":"2016","journal-title":"Int. J. Adv. Eng. Res. Sci."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"2368","DOI":"10.1016\/j.compstruct.2011.03.025","article-title":"Experimental study of the thermo-mechanical properties of recycled PET fiber-reinforced concrete","volume":"93","author":"Fraternali","year":"2011","journal-title":"Compos. Struct."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"232","DOI":"10.1016\/j.cemconcomp.2009.11.002","article-title":"Material and structural performance evaluation of recycled PET fiber reinforced concrete","volume":"32","author":"Kim","year":"2010","journal-title":"Cem. Concr. Compos."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"362","DOI":"10.1016\/j.conbuildmat.2016.04.050","article-title":"Mechanical properties of concrete reinforced with recycled HDPE plastic fibres","volume":"115","author":"Garcia","year":"2016","journal-title":"Constr. Build. Mater."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"3196","DOI":"10.1016\/j.conbuildmat.2009.06.017","article-title":"Properties of concrete reinforced with different kinds of industrial waste fibre materials","volume":"23","author":"Meddah","year":"2009","journal-title":"Constr. Build. Mater."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"236","DOI":"10.1016\/j.conbuildmat.2013.11.049","article-title":"Mechanical properties and abrasion behaviour of concrete containing shredded PET bottle waste as a partial substitution of natural aggregate","volume":"52","author":"Saikia","year":"2014","journal-title":"Constr. Build. Mater."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"1696","DOI":"10.1016\/j.wasman.2010.02.005","article-title":"Waste tyre rubberized concrete: Properties at fresh and hardened state","volume":"30","author":"Aiello","year":"2010","journal-title":"Waste Manag."},{"key":"ref_23","doi-asserted-by":"crossref","unstructured":"Ahmad, J., Majdi, A., Babeker Elhag, A., Deifalla, A.F., Soomro, M., Isleem, H.F., and Qaidi, S. (2022). A step towards sustainable concrete with substitution of plastic waste in concrete: Overview on mechanical, durability and microstructure analysis. Crystals, 12.","DOI":"10.3390\/cryst12070944"},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"125994","DOI":"10.1016\/j.conbuildmat.2021.125994","article-title":"Sustainable cement mortar with recycled plastics enabled by the matrix-aggregate compatibility improvement","volume":"318","author":"Chen","year":"2022","journal-title":"Constr. Build. Mater."},{"key":"ref_25","unstructured":"Beller, G. (2019). The Effect of High Temperature on the Properties of Mortar Containing PET Aggregate. [Master\u2019s Thesis, Nigde Omer Halisdemir University, Institute of Science]. (In Turkish)."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"127","DOI":"10.1016\/j.proeng.2017.04.534","article-title":"Investigation of influence of recycled plastics from cable, ethylene vinyl acetate and polystyrene waste on lightweight concrete properties","volume":"195","author":"Gregorova","year":"2017","journal-title":"Procedia Eng."},{"key":"ref_27","first-page":"e00728","article-title":"Microwave radiation treatment to improve the strength of recycled plastic aggregate concrete","volume":"15","author":"Zhuge","year":"2021","journal-title":"Case Stud. Constr. Mater."},{"key":"ref_28","first-page":"105","article-title":"Performance of light-weight concrete with plastic aggregate","volume":"5","author":"Ramesan","year":"2015","journal-title":"Int. J. Eng. Res. Appl."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"718","DOI":"10.1007\/s10163-014-0303-5","article-title":"Recycling of E-plastic waste as a construction material in developing countries","volume":"17","author":"Baskar","year":"2015","journal-title":"J. Mater. Cycles Waste Manag."},{"key":"ref_30","first-page":"382","article-title":"Use of plastic waste in sand concrete","volume":"7","author":"Guendouz","year":"2016","journal-title":"J. Mater. Environ. Sci."},{"key":"ref_31","first-page":"47","article-title":"Concrete containing plastic aggregates","volume":"19","author":"Dalal","year":"1997","journal-title":"Concr. Int."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"1870","DOI":"10.1016\/j.wasman.2006.07.026","article-title":"Use of selected waste materials in concrete mixes","volume":"27","author":"Batayneh","year":"2007","journal-title":"Waste Manag."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"444","DOI":"10.1016\/j.conbuildmat.2015.03.038","article-title":"Properties of self-compacting lightweight concrete containing recycled plastic particles","volume":"84","author":"Yang","year":"2015","journal-title":"Constr. Build. Mater."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"436","DOI":"10.1016\/j.conbuildmat.2013.02.049","article-title":"The use of plastic waste as fine aggregate in the self-compacting mortars: Effect on physical and mechanical properties","volume":"43","author":"Safi","year":"2013","journal-title":"Constr. Build. Mater."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"34","DOI":"10.11648\/j.es.20190402.12","article-title":"Mechanical and Physical Properties of PP and HDPE","volume":"4","author":"Awad","year":"2019","journal-title":"Eng. Sci."},{"key":"ref_36","doi-asserted-by":"crossref","unstructured":"Rahman, T., and Nurdiana, J. (2020). The effect of HDPE plastic fibres on concrete performance. Preprints, 2020080413.","DOI":"10.20944\/preprints202008.0413.v1"},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"119559","DOI":"10.1016\/j.conbuildmat.2020.119559","article-title":"Mechanical and physical properties and morphology of concrete containing plastic waste as aggregate","volume":"257","author":"Belmokaddem","year":"2020","journal-title":"Constr. Build. Mater."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"2707","DOI":"10.1016\/j.wasman.2009.05.007","article-title":"Influence of content and particle size of waste pet bottles on concrete behavior at different w\/c ratios","volume":"29","author":"Albano","year":"2009","journal-title":"Waste Manag."},{"key":"ref_39","unstructured":"Jones, R., and Facaroau, I. (1971). Incerearea Nedistructiva a Betonului, Editure Technica."},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"385","DOI":"10.1016\/j.conbuildmat.2012.02.066","article-title":"Use of plastic waste as aggregate in cement mortar and concrete preparation: A review","volume":"34","author":"Saikia","year":"2012","journal-title":"Constr. Build. Mater."},{"key":"ref_41","first-page":"247","article-title":"Effect of waste plastic and fly ash on mechanical properties of rigid pavement","volume":"7","author":"Kumari","year":"2016","journal-title":"Technology"},{"key":"ref_42","unstructured":"Gavela, S., Karakosta, C., Nydriotis, C., Kaselouri-Rigopoulou, V., Kolias, S., Tarantili, P.A., Magoulas, C., Tassios, D., and Andreopoulos, A. (2004, January 8\u201311). A study of concretes containing thermoplastic wastes as aggregates. Proceedings of the International RILEM Conference on the Use of Recycled Materials in Buildings and Structures, Barcelona, Spain."},{"key":"ref_43","first-page":"177","article-title":"Investigation of the use of waste plastic as an aggregate for lightweight concrete","volume":"5","author":"Koide","year":"2002","journal-title":"Chall. Concr. Constr."},{"key":"ref_44","first-page":"E607","article-title":"Effect of main and side chain length change of polycarboxylate-ether-based water-reducing admixtures on the fresh state and mechanical properties of cementitious systems","volume":"22","author":"Altun","year":"2021","journal-title":"Struct. Concr."},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"356","DOI":"10.1016\/j.conbuildmat.2012.07.109","article-title":"Mechanical properties of high-volume fly ash roller compacted concrete designed by maximum density method","volume":"38","author":"Ramyar","year":"2013","journal-title":"Constr. Build. Mater."},{"key":"ref_46","first-page":"469272","article-title":"Study of waste plastic mix concrete with plasticizer","volume":"2012","author":"Rai","year":"2012","journal-title":"Int. Sch. Res. Not."},{"key":"ref_47","doi-asserted-by":"crossref","first-page":"776","DOI":"10.1016\/j.cemconres.2004.05.014","article-title":"Effects of waste PET bottles aggregate on the properties of concrete","volume":"35","author":"Choi","year":"2005","journal-title":"Cem. Concr. Res."},{"key":"ref_48","unstructured":"Ismail, Z.Z., and Al-Hashmi, E.A. (2010, January 28\u201330). Validation of using mixed iron and plastic wastes in concrete. Proceedings of the Second International Conference on Sustainable Construction Materials and Technologies, Ancona, Italy."}],"container-title":["Polymers"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2073-4360\/18\/4\/542\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,2,23]],"date-time":"2026-02-23T14:13:59Z","timestamp":1771856039000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2073-4360\/18\/4\/542"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,2,23]]},"references-count":48,"journal-issue":{"issue":"4","published-online":{"date-parts":[[2026,2]]}},"alternative-id":["polym18040542"],"URL":"https:\/\/doi.org\/10.3390\/polym18040542","relation":{},"ISSN":["2073-4360"],"issn-type":[{"value":"2073-4360","type":"electronic"}],"subject":[],"published":{"date-parts":[[2026,2,23]]}}}