{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,1]],"date-time":"2026-02-01T03:07:10Z","timestamp":1769915230521,"version":"3.49.0"},"reference-count":56,"publisher":"MDPI AG","issue":"10","license":[{"start":{"date-parts":[[2022,5,12]],"date-time":"2022-05-12T00:00:00Z","timestamp":1652313600000},"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"],"award-info":[{"award-number":["PTDC\/ECI-COM-31138\/2017"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sustainability"],"abstract":"<jats:p>This study evaluates the thermal conductivity of concrete produced with reactive magnesium oxide (MgO) as a partial replacement for cement. MgO is a viable option for the concrete industry, mainly due to its benefits in sustainability and reducing CO2 emissions compared to cement emissions. Four different MgO\u2019s produced in Australia, Canada, and Spain were used in concrete mixes as a partial replacement of cement at 5%, 10%, and 20% by mass. The experimental results showed that the thermal conductivity is higher when MgO increases in mixes after 28 days of curing. With the incorporation of MgO, the thermal conductivity increased between 3.2% and 10.2%, and the mechanical properties declined: compressive strength between 12.7% to 26.2%, splitting tensile strength between 9.7% to 34.0%, and modulus of elasticity between \u22124.1% to 7.8%. Finally, it is important to highlight that the addition of different contents of MgO in the concrete mixes modified the microstructure of the cement matrix. As a result, there was an increase in porosity, which negatively influenced the mechanical properties and thermal conductivity. Therefore, the relationships between these properties were also analyzed.<\/jats:p>","DOI":"10.3390\/su14105885","type":"journal-article","created":{"date-parts":[[2022,5,12]],"date-time":"2022-05-12T23:08:36Z","timestamp":1652396916000},"page":"5885","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Thermal Performance of Concrete with Reactive Magnesium Oxide as an Alternative Binder"],"prefix":"10.3390","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8768-3152","authenticated-orcid":false,"given":"Javier A.","family":"Forero","sequence":"first","affiliation":[{"name":"Postgraduate Program in Structural Engineering and Construction (PECC), Predio SG-12 Campus Darcy Ribeiro, University of Bras\u00edlia, Brasilia 70910-900, Brazil"},{"name":"CERIS, Instituto Superior T\u00e9cnico, Universidade de Lisboa, 1049-001 Lisbon, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0393-4039","authenticated-orcid":false,"given":"Miguel","family":"Bravo","sequence":"additional","affiliation":[{"name":"CERIS, Instituto Superior T\u00e9cnico, Universidade de Lisboa, 1049-001 Lisbon, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9348-1226","authenticated-orcid":false,"given":"Jo\u00e3o","family":"Pacheco","sequence":"additional","affiliation":[{"name":"CERIS, Instituto Superior T\u00e9cnico, Universidade de Lisboa, 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, Instituto Superior T\u00e9cnico, Universidade de Lisboa, 1049-001 Lisbon, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8406-6864","authenticated-orcid":false,"given":"Lu\u00eds","family":"Evangelista","sequence":"additional","affiliation":[{"name":"CERIS, Instituto Superior de Engenharia de Lisboa, 1950-062 Lisbon, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2022,5,12]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"827","DOI":"10.1038\/nclimate3096","article-title":"Science and policy characteristics of the Paris Agreement temperature goal","volume":"6","author":"Schleussner","year":"2016","journal-title":"Nat. Clim. Chang."},{"key":"ref_2","unstructured":"Nilsson, A., Hans, F., Lopez Legarreta, P., Lui, S., and R\u00f6ser, F. (2020). Decarbonisation Pathways for the EU Cement Sector, NewClimate Institute. Technology Routes and Potential Ways Forward."},{"key":"ref_3","unstructured":"Dean, B., Dulac, J., Petrichenko, K., and Graham, P. (2016). Global Status Report 2016: Towards Zero-Emission Efficient and Resilient Buildings, UN Environment Programme."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"195","DOI":"10.5194\/essd-10-195-2018","article-title":"Global CO2 emissions from cement production","volume":"10","author":"Andrew","year":"2018","journal-title":"Earth Syst. Sci. Data"},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"55","DOI":"10.1016\/j.cemconres.2014.02.005","article-title":"Enhancing the carbonation of MgO cement porous blocks through improved curing conditions","volume":"59","author":"Unluer","year":"2014","journal-title":"Cem. Concr. Res."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"1047","DOI":"10.1016\/j.ceramint.2009.12.009","article-title":"Temperature and common-ion effect on magnesium oxide (MgO) hydration","volume":"36","author":"Amaral","year":"2010","journal-title":"Ceram. Int."},{"key":"ref_7","unstructured":"(2000). Cement\u2013Part 1: Composition, Specifications and Conformity Criteria for Common Cements (Standard No. EN 197-1:2011)."},{"key":"ref_8","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_9","doi-asserted-by":"crossref","unstructured":"Shand, M.A. (2006). The Chemistry and Technology of Magnesia, John Wiley & Sons.","DOI":"10.1002\/0471980579"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"57","DOI":"10.1080\/08827508508952601","article-title":"Magnesia\u2014An important industrial mineral: A review of processing options and uses","volume":"2","author":"Canterford","year":"1985","journal-title":"Miner. Process. Extr. Metall. Rev."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"637","DOI":"10.1007\/BF00745561","article-title":"Calcination of precipitated Mg (OH) 2 to active MgO in the production of refractory and chemical grade MgO","volume":"18","author":"Green","year":"1983","journal-title":"J. Mater. Sci."},{"key":"ref_12","doi-asserted-by":"crossref","unstructured":"Nobre, J., Ahmed, H., Bravo, M., Evangelista, L., and de Brito, J. (2020). Magnesia (MgO) Production and Characterization, and Its Influence on the Performance of Cementitious Materials: A Review. Materials, 13.","DOI":"10.3390\/ma13214752"},{"key":"ref_13","unstructured":"Schorcht, F., Kourti, I., Scalet, B.M., Roudier, S., and Sancho, L.D. (2013). Best Available Techniques (BAT) Reference Document for the Production of Cement, Lime and Magnesium Oxide, European Commission Joint Research Centre Institute for Prospective Technological Studies."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/j.cemconres.2013.12.007","article-title":"MgO expansive cement and concrete in China: Past, present and future","volume":"57","author":"Mo","year":"2014","journal-title":"Cem. Concr. Res."},{"key":"ref_15","first-page":"215","article-title":"Spinel-containing refractories","volume":"Volume 178","author":"Zhang","year":"2004","journal-title":"Refractories Handbook"},{"key":"ref_16","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."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"7","DOI":"10.1016\/j.cemconres.2015.01.018","article-title":"Deformation and mechanical properties of quaternary blended cements containing ground granulated blast furnace slag, fly ash and magnesia","volume":"71","author":"Mo","year":"2015","journal-title":"Cem. Concr. Res"},{"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":"132","DOI":"10.1016\/j.conbuildmat.2005.06.033","article-title":"Soundness evaluation of concrete with MgO","volume":"21","author":"Gao","year":"2007","journal-title":"Constr. Build. Mater."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"193","DOI":"10.1016\/j.compositesb.2013.06.033","article-title":"The effects of nanoscale expansive agents on the mechanical properties of non-shrink cement-based composites: The influence of nano-MgO addition","volume":"55","author":"Moradpour","year":"2013","journal-title":"Compos. Part B Eng."},{"key":"ref_21","unstructured":"Lau, W.Y. (2019). The Role of Reactive MgO as an Expansive Additive in the Shrinkage Reduction of Concrete. [Ph.D. Thesis, University of Cambridge]."},{"key":"ref_22","doi-asserted-by":"crossref","unstructured":"Bravo, M., Forero, J.A., Nobre, J., De Brito, J., and Evangelista, L. (2021). Performance of Mortars with Commercially-Available Reactive Magnesium Oxide as Alternative Binder. Materials, 14.","DOI":"10.3390\/ma14040938"},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"349","DOI":"10.1016\/j.conbuildmat.2016.05.067","article-title":"Investigation of carbonation depth and its influence on the performance and microstructure of MgO cement and PC mixes","volume":"120","author":"Pu","year":"2016","journal-title":"Constr. Build. Mater."},{"key":"ref_24","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_25","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_26","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_27","doi-asserted-by":"crossref","first-page":"322","DOI":"10.1061\/(ASCE)0899-1561(2004)16:4(322)","article-title":"Permeable porosity and thermal conductivity of construction materials","volume":"16","author":"Bhattacharjee","year":"2004","journal-title":"J. Mater. Civ. Eng."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"670","DOI":"10.1016\/j.conbuildmat.2015.12.163","article-title":"Engineering properties and durability of high-strength self-compacting concrete with no-cement SFC binder","volume":"106","author":"Nguyen","year":"2016","journal-title":"Constr. Build. Mater."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"357","DOI":"10.6028\/jres.103.021","article-title":"Thermal conductivity of magnesium oxide from absolute, steady-state measurements","volume":"103","author":"Slifka","year":"1998","journal-title":"J. Res. Natl. Inst. Stand. Technol."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"04020332","DOI":"10.1061\/(ASCE)MT.1943-5533.0003420","article-title":"Effect of fly ash and reactive MgO on the engineering properties and durability of high-performance concrete produced with alkali-activated slag and recycled aggregate","volume":"32","author":"Vo","year":"2020","journal-title":"J. Mater. Civ. Eng."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"104","DOI":"10.1016\/j.cemconcomp.2017.03.004","article-title":"Influence of mix design on the carbonation, mechanical properties and microstructure of reactive MgO cement-based concrete","volume":"80","author":"Ruan","year":"2017","journal-title":"Cem. Concr. Compos."},{"key":"ref_32","doi-asserted-by":"crossref","unstructured":"Forero, J.A., Bravo, M., Pacheco, J., de Brito, J., and Evangelista, L. (2021). Fracture Behaviour of Concrete with Reactive Magnesium Oxide as Alternative Binder. Appl. Sci., 11.","DOI":"10.3390\/app11072891"},{"key":"ref_33","doi-asserted-by":"crossref","unstructured":"Rehsi, S. (1983). Magnesium oxide in portland cement. Advances in Cement Technology, Elsevier.","DOI":"10.1016\/B978-0-08-028670-9.50019-3"},{"key":"ref_34","first-page":"9271507","article-title":"Hydration of reactive MgO as partial cement replacement and its influence on the macroperformance of cementitious mortars","volume":"2019","author":"Silva","year":"2019","journal-title":"Adv. Mater. Sci. Eng."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"1640","DOI":"10.1111\/j.1551-2916.2008.02330.x","article-title":"Accelerated reactivity assessment of light burnt magnesium oxide","volume":"91","author":"Chau","year":"2008","journal-title":"J. Am. Ceram. Soc."},{"key":"ref_36","unstructured":"(2002). Aggregates for Concrete (Standard No. BS EN 12620:2002)."},{"key":"ref_37","unstructured":"(2009). Testing Hardened Concrete\u2014Part 3: Compressive Strength of Test Specimens (Standard No. EN 12390-3:2019)."},{"key":"ref_38","unstructured":"(2009). Testing Hardened Concrete. Tensile Splitting Strength of Test Specimens (Standard No. BS EN 12390-6:2009)."},{"key":"ref_39","unstructured":"LNEC (1993). 397-\u201cBet\u00f5es: Determina\u00e7\u00e3o do M\u00f3dulo de Elasticidade em Compress\u00e3o\u201d, Laborat\u00f3rio Nacional de Engenharia Civil."},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"317","DOI":"10.1016\/j.conbuildmat.2011.06.027","article-title":"Methodology for mix design of the mortar phase of self-compacting concrete using different mineral additions in binary blends of powders","volume":"26","author":"Nepomuceno","year":"2012","journal-title":"Constr. Build. Mater."},{"key":"ref_41","unstructured":"(2016). Concrete\u2014Specification, Performance, Production and Conformity (Standard No. BS EN 206:2013+A1:2016)."},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"101605","DOI":"10.1016\/j.jobe.2020.101605","article-title":"The influence of MgO addition on the performance of alkali-activated materials with slag\u2013rice husk ash blending","volume":"33","author":"Vo","year":"2021","journal-title":"J. Build. Eng."},{"key":"ref_43","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_44","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_45","doi-asserted-by":"crossref","first-page":"1049","DOI":"10.1016\/0008-8846(91)90065-P","article-title":"MgO-type delayed expansive cement","volume":"21","author":"Zheng","year":"1991","journal-title":"Cem. Concr. Res."},{"key":"ref_46","doi-asserted-by":"crossref","unstructured":"Jang, J.-K., Kim, H.-G., Kim, J.-H., and Ryou, J.-S. (2018). The evaluation of damage effects on MgO added concrete with slag cement exposed to calcium chloride deicing salt. Materials, 11.","DOI":"10.3390\/ma11050793"},{"key":"ref_47","first-page":"45","article-title":"A review of magnesium oxide in concrete","volume":"27","author":"Du","year":"2005","journal-title":"Concr. Int."},{"key":"ref_48","doi-asserted-by":"crossref","first-page":"77","DOI":"10.1016\/j.conbuildmat.2018.03.223","article-title":"Mechanical properties and rapid chloride permeability of carbonated concrete containing reactive MgO","volume":"172","author":"Zhang","year":"2018","journal-title":"Constr. Build. Mater."},{"key":"ref_49","doi-asserted-by":"crossref","first-page":"239","DOI":"10.1016\/j.conbuildmat.2010.06.033","article-title":"Influence of a combination of expansive and shrinkage-reducing admixture on autogenous deformation and self-stress of silica fume high-performance concrete","volume":"25","author":"Meddah","year":"2011","journal-title":"Constr. Build. Mater."},{"key":"ref_50","doi-asserted-by":"crossref","first-page":"1107","DOI":"10.1007\/s10973-011-1328-9","article-title":"Thermal properties and combustibility of cross-linked XNBR\/CSM blends: Part I. Influence of the magnesium oxide","volume":"104","author":"Janowska","year":"2011","journal-title":"J. Therm. Anal. Calorim."},{"key":"ref_51","doi-asserted-by":"crossref","unstructured":"Yildirim, S., and R\u00f6cker, B. (2018). Active packaging. Nanomaterials for Food Packaging, Elsevier.","DOI":"10.1016\/B978-0-323-51271-8.00007-3"},{"key":"ref_52","doi-asserted-by":"crossref","first-page":"647","DOI":"10.1016\/j.cemconcomp.2007.04.008","article-title":"Evaluation of thermal conductivity in air permeable concrete for dynamic breathing wall construction","volume":"29","author":"Wong","year":"2007","journal-title":"Cem. Concr. Compos."},{"key":"ref_53","doi-asserted-by":"crossref","first-page":"612","DOI":"10.1016\/j.conbuildmat.2014.05.039","article-title":"Thermal conductivity of hemp concretes: Variation with formulation, density and water content","volume":"65","author":"Collet","year":"2014","journal-title":"Constr. Build. Mater."},{"key":"ref_54","doi-asserted-by":"crossref","first-page":"515","DOI":"10.6008\/CBPC2179-6858.2021.005.0041","article-title":"Influ\u00eancia da porosidade na condutividade t\u00e9rmica, resist\u00eancia mec\u00e2nica e coeficiente de permeabilidade do concreto perme\u00e1vel","volume":"12","author":"Ramos","year":"2021","journal-title":"Rev. Ibero-Am. Ci\u00eancias Ambient."},{"key":"ref_55","doi-asserted-by":"crossref","first-page":"620","DOI":"10.1016\/j.conbuildmat.2015.07.058","article-title":"Study on thermal properties of recycled aggregate concrete and recycled concrete blocks","volume":"94","author":"Zhu","year":"2015","journal-title":"Constr. Build. Mater."},{"key":"ref_56","unstructured":"(2004). Eurocode 2: Design of Concrete Structures\u2014Part 1-1: General Rules and Rules for Buildings (Standard No. EN 1992-1-1:2004\/A1:2014)."}],"container-title":["Sustainability"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2071-1050\/14\/10\/5885\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T23:09:54Z","timestamp":1760137794000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2071-1050\/14\/10\/5885"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2022,5,12]]},"references-count":56,"journal-issue":{"issue":"10","published-online":{"date-parts":[[2022,5]]}},"alternative-id":["su14105885"],"URL":"https:\/\/doi.org\/10.3390\/su14105885","relation":{},"ISSN":["2071-1050"],"issn-type":[{"value":"2071-1050","type":"electronic"}],"subject":[],"published":{"date-parts":[[2022,5,12]]}}}