{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,21]],"date-time":"2026-01-21T07:06:32Z","timestamp":1768979192045,"version":"3.49.0"},"reference-count":62,"publisher":"MDPI AG","issue":"7","license":[{"start":{"date-parts":[[2023,3,30]],"date-time":"2023-03-30T00:00:00Z","timestamp":1680134400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Portuguese Foundation for Science and Technology (FCT)","award":["PTDC\/ECI-COM-31138\/2017 (DecarbonCrete)"],"award-info":[{"award-number":["PTDC\/ECI-COM-31138\/2017 (DecarbonCrete)"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Materials"],"abstract":"<jats:p>In the construction industry, cement is the most widely used material. So, to achieve greater sustainability in this industry, it is imperative to improve the sustainability of this material. One way to reduce the ecological footprint of cement is to replace it, even if partially, with other more sustainable materials that can act as binders. This paper analyses the mechanical properties of more sustainable mortars containing recycled cement (RC), fly ash (FA), and magnesium oxide (MgO). Different types of binary, ternary, and quaternary mortars were used: containing recycled cement (5% and 10%), fly ash (10% and 20%), and MgO (7.5% and 15%). An experimental campaign was carried out analysing air content, density, compressive and flexural strengths, modulus of elasticity, and ultrasonic pulse velocity. The ternary mortars showed decreases between 0.4% (M-5RC10FA) and 35.3% (M-10RC15Mg) in terms of compressive strength at 365 days (compared to RM), when the theoretically expected decrease (the sum of the decreases obtained with the individual incorporation of these materials) would be between 16.6% and 41.5%, respectively. The results obtained allow for concluding that the joint use of these materials in ternary mortars improves the mechanical capacity, relative to the individual incorporation of each material in binary mortars.<\/jats:p>","DOI":"10.3390\/ma16072760","type":"journal-article","created":{"date-parts":[[2023,3,30]],"date-time":"2023-03-30T02:23:46Z","timestamp":1680143026000},"page":"2760","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["The Influence of Recycled Cement, Fly Ash, and Magnesium Oxide on the Mechanical Performance of Sustainable Cementitious Materials"],"prefix":"10.3390","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0009-0006-1547-5748","authenticated-orcid":false,"given":"Lucas","family":"Sequeira","sequence":"first","affiliation":[{"name":"CERIS, Department of Civil Engineering, Architecture and Georresources, Instituto Superior T\u00e9cnico (IST), University of Lisbon, 1049-001 Lisbon, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9055-1540","authenticated-orcid":false,"given":"Blas","family":"Cantero","sequence":"additional","affiliation":[{"name":"Department of Construction Technology, University of A Coru\u00f1a, E.T.S.I. Caminos, Canales, Puertos, Campus Elvi\u00f1a s\/n, 15071 La Coru\u00f1a, Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0393-4039","authenticated-orcid":false,"given":"Miguel","family":"Bravo","sequence":"additional","affiliation":[{"name":"CERIS, Department of Civil Engineering, Architecture and Georresources, Instituto Superior T\u00e9cnico (IST), University of Lisbon, 1049-001 Lisbon, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6766-2736","authenticated-orcid":false,"given":"Jorge","family":"de Brito","sequence":"additional","affiliation":[{"name":"CERIS, Department of Civil Engineering, Architecture and Georresources, Instituto Superior T\u00e9cnico (IST), University of Lisbon, 1049-001 Lisbon, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7707-3118","authenticated-orcid":false,"given":"C\u00e9sar","family":"Medina","sequence":"additional","affiliation":[{"name":"Department of Construction, University of Extremadura, UEX-CSIC Partnering Unit, Institute for Sustainable Regional Development (INTERRA), 10003 C\u00e1ceres, Spain"}]}],"member":"1968","published-online":{"date-parts":[[2023,3,30]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"142","DOI":"10.1016\/j.jclepro.2012.10.049","article-title":"Global strategies and potentials to curb CO2 emissions in cement industry","volume":"51","author":"Benhelal","year":"2013","journal-title":"J. Clean. Prod."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"6010","DOI":"10.3390\/ma7086010","article-title":"Life cycle assessment of completely recyclable concrete","volume":"7","year":"2014","journal-title":"Materials"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"533","DOI":"10.1177\/13694332221131153","article-title":"Experimental investigation on the bond performance of sea sand coral concrete with FRP bar reinforcement for marine environments","volume":"26","author":"Sun","year":"2023","journal-title":"Adv. Struct. Eng."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"105565","DOI":"10.1016\/j.resconrec.2021.105565","article-title":"A comprehensive review on recycled aggregate and recycled aggregate concrete","volume":"171","author":"Wang","year":"2021","journal-title":"Resour. Conserv. Recycl."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"118242","DOI":"10.1016\/j.powtec.2023.118242","article-title":"A high-strength red mud\u2013fly ash geopolymer and the implications of curing temperature","volume":"416","author":"Bai","year":"2023","journal-title":"Powder Technol."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"177","DOI":"10.1016\/j.conbuildmat.2016.12.174","article-title":"Quality properties of self-consolidating concrete mixed with waste concrete powder","volume":"135","author":"Kim","year":"2017","journal-title":"Constr. Build. Mater."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"720","DOI":"10.1016\/j.jclepro.2018.03.277","article-title":"Mechanical properties of concrete mixed with recycled powder produced from construction and demolition waste","volume":"188","author":"Xiao","year":"2018","journal-title":"J. Clean. Prod."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"123126","DOI":"10.1016\/j.jclepro.2020.123126","article-title":"Use of concrete fine fraction waste as a replacement of Portland cement","volume":"273","author":"Oliveira","year":"2020","journal-title":"J. Clean. Prod."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"121823","DOI":"10.1016\/j.conbuildmat.2020.121823","article-title":"Laboratory-scale study and semi-industrial validation of viability of inorganic CDW fine fractions as SCMs in blended cements","volume":"271","author":"Vegas","year":"2021","journal-title":"Constr. Build. Mater."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"500","DOI":"10.1016\/j.conbuildmat.2011.11.042","article-title":"Utilization of waste concrete powder as a substitution material for cement","volume":"30","author":"Kim","year":"2012","journal-title":"Constr. Build. Mater."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"174","DOI":"10.1016\/j.conbuildmat.2015.02.086","article-title":"A study on development of recycled cement made from waste cementitious powder","volume":"83","author":"Kwon","year":"2015","journal-title":"Constr. Build. Mater."},{"key":"ref_12","doi-asserted-by":"crossref","unstructured":"Kalinowska-Wichrowska, K., Pawluczuk, E., Bo\u0142tryk, M., Jimenez, J.R., Fernandez-Rodriguez, J.M., and Suescum Morales, D. (2022). The performance of concrete made with secondary products-recycled coarse aggregates, recycled cement mortar, and fly ash-slag mix. Materials, 15.","DOI":"10.3390\/ma15041438"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"218","DOI":"10.1016\/j.conbuildmat.2015.12.079","article-title":"Manufacture of hybrid cements with fly ash and bottom ash from a municipal solid waste incinerator","volume":"105","author":"Palomo","year":"2016","journal-title":"Constr. Build. Mater."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"101620","DOI":"10.1016\/j.jobe.2020.101620","article-title":"Zero-cement vs. cementitious mortars: An experimental comparative study on engineering and environmental properties","volume":"32","author":"Ameri","year":"2020","journal-title":"J. Build. Eng."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"1153","DOI":"10.1016\/S0008-8846(02)00757-3","article-title":"Studies on blended cement with a large amount of fly ash","volume":"32","author":"Fu","year":"2002","journal-title":"Cem. Concr. Res."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"1152","DOI":"10.1016\/j.cemconres.2004.10.021","article-title":"The contribution of class-F fly ash to the strength of cementitious mixtures","volume":"35","author":"Malek","year":"2005","journal-title":"Cem. Concr. Res."},{"key":"ref_17","unstructured":"Hewlett, P.C. (1998). Lea\u2019s Chemistry of Cement and Concrete, Butterworth-Heinemann. [4th ed.]."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/j.conbuildmat.2015.01.066","article-title":"Deformation and mechanical properties of the expansive cements produced by inter-grinding cement clinker and MgOs with various reactivities","volume":"80","author":"Mo","year":"2015","journal-title":"Constr. Build. Mater."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"103420","DOI":"10.1016\/j.cemconcomp.2019.103420","article-title":"Mechanical and durability performance of mortars with fine recycled concrete aggregates and reactive magnesium oxide as partial cement replacement","volume":"105","author":"Silva","year":"2020","journal-title":"Cem. Concr. Compos."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"706","DOI":"10.1016\/j.cemconcomp.2008.05.002","article-title":"Microstructures of reactive magnesia cement blends","volume":"30","author":"Vandeperre","year":"2008","journal-title":"Cem. Concr. Compos."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"85","DOI":"10.1016\/j.cemconres.2004.06.022","article-title":"Synthesis and characterisation of magnesium silicate hydrate gels","volume":"35","author":"Brew","year":"2005","journal-title":"Cem. Concr. Res."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"257","DOI":"10.1016\/j.ceramint.2005.02.013","article-title":"Hydration of hydratable alumina in the presence of various forms of MgO","volume":"32","author":"Ye","year":"2006","journal-title":"Ceram. Int."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"77","DOI":"10.1016\/j.conbuildmat.2014.01.080","article-title":"Durability characteristics of fly ash concrete containing lightly-burnt MgO","volume":"58","author":"Choi","year":"2014","journal-title":"Constr. Build. Mater."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"361","DOI":"10.1016\/j.jclepro.2016.02.125","article-title":"Assessing the environmental and economic potential of limestone calcined clay cement in Cuba","volume":"124","author":"Favier","year":"2016","journal-title":"J. Clean. Prod."},{"key":"ref_25","unstructured":"Abdalqader, A., and Al-Tabbaa, A. (2014, January 11\u201313). Mechanical and Microstructural Characterisation of Multicomponent Blended Cements Incorporating Reactive Magnesia. Proceedings of the 1st Concrete Innovative Conference (CIC), Oslo, Norway."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"2189","DOI":"10.32604\/jrm.2021.015394","article-title":"Utilization of recycled concrete powder in cement composite: Strength, microstructure and hydration characteristics","volume":"9","author":"Chen","year":"2021","journal-title":"J. Renew. Mater."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"116929","DOI":"10.1016\/j.conbuildmat.2019.116929","article-title":"Effects of water to cement ratio, recycled fine aggregate and air entraining\/plasticizer admixture on masonry mortar properties","volume":"230","author":"Zamorano","year":"2020","journal-title":"Constr. Build. Mater."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"117228","DOI":"10.1016\/j.conbuildmat.2019.117228","article-title":"Utilization of limestone powder and fly ash in blended cement: Rheology, strength and hydration characteristics","volume":"232","author":"Jiang","year":"2020","journal-title":"Constr. Build. Mater."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"1122","DOI":"10.1016\/j.conbuildmat.2015.10.091","article-title":"Properties of concrete made of multicomponent mixes of low-energy demanding binders","volume":"101","author":"Mavroulidou","year":"2015","journal-title":"Constr. Build. Mater."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"87","DOI":"10.1016\/j.cemconres.2013.08.009","article-title":"Impact of hydrated magnesium carbonate additives on the carbonation of reactive MgO cements","volume":"54","author":"Unluer","year":"2013","journal-title":"Cem. Concr. Res."},{"key":"ref_31","doi-asserted-by":"crossref","unstructured":"Cantero, B., Bravo, M., de Brito, J., del Bosque, I.F., and Medina, C. (2022). The influence of fly ash on the mechanical performance of cementitious materials produced with recycled cement. Appl. Sci., 12.","DOI":"10.3390\/app12042257"},{"key":"ref_32","unstructured":"(2014). Tests for Mechanical and Physical Properties of Aggregates. Part 6: Determination of Particle Density and Water Absorption (Standard No. EN 1097)."},{"key":"ref_33","unstructured":"Dunod, P. (1958). Le B\u00e9ton, Dunod."},{"key":"ref_34","unstructured":"(2013). Part 1: Specification, Production and Conformity (Standard No. EN 206 Concrete)."},{"key":"ref_35","unstructured":"(1999). Methods of Test for Mortar for Masonr. Part 3: Determination of Consistence of Fresh Mortar (Standard No. EN 1015-3)."},{"key":"ref_36","unstructured":"(1999). Methods of Test for Mortar for Masonr. Part 6: Determination of Bulk Density of Fresh Mortar (Standard No. EN 1015-6)."},{"key":"ref_37","unstructured":"(2019). Testing Fresh Concrete. Part 7: Air Conten. Pressure Methods (Standard No. EN 12350)."},{"key":"ref_38","unstructured":"(2020). Methods of Test for Mortar for Masonr. Part 11: Determination of Flexural and Compressive Strength of Hardened Mortar (Standard No. EN 1015-11)."},{"key":"ref_39","unstructured":"(2016). Standard Test Method for Dynamic Young\u2019s Modulus, and Poisson\u2019s Ratio by Impulse Excitation of Vibration (Standard No. ASTM E1876-15)."},{"key":"ref_40","unstructured":"(2004). Testing Concrete in Structures. Part 4: Determination of Ultrasonic Pulse Velocity (Standard No. EN 12504-4)."},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"1268","DOI":"10.1016\/j.conbuildmat.2013.06.013","article-title":"Evaluation and improvement of pozzolanic activity of andesite for its use in eco-efficient cement","volume":"47","author":"Hamidi","year":"2013","journal-title":"Constr. Build. Mater."},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"122913","DOI":"10.1016\/j.jclepro.2020.122913","article-title":"Mechanical behaviour of structural concrete with ground recycled concrete cement and mixed recycled aggregate","volume":"275","author":"Cantero","year":"2020","journal-title":"J. Clean. Prod."},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"117622","DOI":"10.1016\/j.conbuildmat.2019.117622","article-title":"Rheological properties of mortar containing recycled powders from construction and demolition wastes","volume":"237","author":"Duan","year":"2020","journal-title":"Constr. Build. Mater."},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"128584","DOI":"10.1016\/j.conbuildmat.2022.128584","article-title":"Experimental study on the early-age properties of cement pastes with recycled brick powder","volume":"347","author":"Luo","year":"2022","journal-title":"Constr. Build. Mater."},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"27","DOI":"10.1016\/j.cemconcomp.2014.04.003","article-title":"Strength and hydration products of reactive MgO\u2013silica pastes","volume":"52","author":"Jin","year":"2014","journal-title":"Cem. Concr. Compos."},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"189","DOI":"10.1016\/S0378-7788(02)00052-X","article-title":"Influence of mineral admixtures on thermal conductivity and compressive strength of mortar","volume":"35","year":"2003","journal-title":"Energy Build."},{"key":"ref_47","doi-asserted-by":"crossref","first-page":"106396","DOI":"10.1016\/j.cemconres.2021.106396","article-title":"Towards ternary binders involving limestone additions-A review","volume":"143","author":"Dhandapani","year":"2021","journal-title":"Cem. Concr. Res."},{"key":"ref_48","doi-asserted-by":"crossref","first-page":"169","DOI":"10.1016\/j.cemconcomp.2018.04.002","article-title":"Properties of fly ash blended magnesium potassium phosphate mortars: Effect of the ratio between fly ash and magnesia","volume":"90","author":"Xu","year":"2018","journal-title":"Cem. Concr. Compos."},{"key":"ref_49","doi-asserted-by":"crossref","first-page":"984","DOI":"10.1016\/j.cemconres.2010.03.001","article-title":"Modeling the hydration of concrete incorporating fly ash or slag","volume":"40","author":"Wang","year":"2010","journal-title":"Cem. Concr. Res."},{"key":"ref_50","unstructured":"(2014). Standard Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in Concrete (Standard No. ASTM C618-19)."},{"key":"ref_51","first-page":"e00725","article-title":"Effect of recycled concrete powder on strength, electrical resistivity, and water absorption of self-compacting mortars","volume":"15","author":"Horsakulthai","year":"2021","journal-title":"Case Stud. Constr. Mater."},{"key":"ref_52","doi-asserted-by":"crossref","first-page":"21","DOI":"10.1007\/s40996-018-0110-7","article-title":"Experimental study on effect of water\u2013cement ratio and sand grading on workability and mechanical properties of masonry mortars in Iran","volume":"43","author":"Dehghan","year":"2019","journal-title":"Iran. J. Sci. Technol. Trans. Civ. Eng."},{"key":"ref_53","doi-asserted-by":"crossref","first-page":"103486","DOI":"10.1016\/j.cemconcomp.2019.103486","article-title":"Water transport mechanisms in concretes bearing mixed recycled aggregates","volume":"107","author":"Cantero","year":"2020","journal-title":"Cem. Concr. Compos."},{"key":"ref_54","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/j.jclepro.2016.02.013","article-title":"A review of waste products utilized as supplements to Portland cement in concrete","volume":"121","author":"Paris","year":"2016","journal-title":"J. Clean. Prod."},{"key":"ref_55","doi-asserted-by":"crossref","first-page":"962","DOI":"10.1016\/j.ultras.2012.12.012","article-title":"Compressive strength evaluation of structural lightweight concrete by non-destructive ultrasonic pulse velocity method","volume":"53","author":"Bogas","year":"2013","journal-title":"Ultrasonics"},{"key":"ref_56","doi-asserted-by":"crossref","unstructured":"Alnahhal, M.F., Alengaram, U.J., Jumaat, M.Z., Alqedra, M.A., Mo, K.H., and Sumesh, M. (2017). Evaluation of industrial by-products as sustainable pozzolanic materials in recycled aggregate concrete. Sustainability, 9.","DOI":"10.3390\/su9050767"},{"key":"ref_57","doi-asserted-by":"crossref","first-page":"1022","DOI":"10.1016\/j.conbuildmat.2016.08.158","article-title":"Concrete quality designation based on ultrasonic pulse velocity","volume":"125","author":"Philibert","year":"2016","journal-title":"Constr. Build. Mater."},{"key":"ref_58","doi-asserted-by":"crossref","first-page":"887","DOI":"10.1016\/j.jclepro.2018.02.127","article-title":"The deterioration and environmental impact of binary cements containing thermally activated coal mining waste due to calcium leaching","volume":"183","author":"Arribas","year":"2018","journal-title":"J. Clean. Prod."},{"key":"ref_59","doi-asserted-by":"crossref","first-page":"67","DOI":"10.1016\/j.resconrec.2016.02.009","article-title":"Comparative environmental evaluation of aggregate production from recycled waste materials and virgin sources by LCA","volume":"109","author":"Hossain","year":"2016","journal-title":"Resour. Conserv. Recycl."},{"key":"ref_60","doi-asserted-by":"crossref","first-page":"258","DOI":"10.1016\/j.jclepro.2016.07.071","article-title":"Comparative life cycle assessment of reactive MgO and Portland cement production","volume":"137","author":"Ruan","year":"2016","journal-title":"J. Clean. Prod."},{"key":"ref_61","first-page":"185","article-title":"Ultra-green construction: Reactive magnesia masonry products","volume":"162","author":"Liska","year":"2009","journal-title":"Waste Resour. Manag."},{"key":"ref_62","doi-asserted-by":"crossref","first-page":"4170","DOI":"10.1021\/acs.chemrev.5b00463","article-title":"Magnesia-based cements: A journey of 150 years, and cements for the future?","volume":"116","author":"Walling","year":"2016","journal-title":"Chem. Rev."}],"container-title":["Materials"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1996-1944\/16\/7\/2760\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T19:06:50Z","timestamp":1760123210000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1996-1944\/16\/7\/2760"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2023,3,30]]},"references-count":62,"journal-issue":{"issue":"7","published-online":{"date-parts":[[2023,4]]}},"alternative-id":["ma16072760"],"URL":"https:\/\/doi.org\/10.3390\/ma16072760","relation":{},"ISSN":["1996-1944"],"issn-type":[{"value":"1996-1944","type":"electronic"}],"subject":[],"published":{"date-parts":[[2023,3,30]]}}}