Thermal properties of cement mortar with different mix proportions

P. Shafigh; I. Asadi; A. R. Akhiani; N. B. Mahyuddin; M. Hashemi

doi:10.3989/mc.2020.09219

Authors

P. Shafigh Department of Building Surveying, Faculty of Built Environment, University of Malaya - Centre for Building, Construction & Tropical Architecture (BuCTA), Faculty of Built Environment, University of Malaya https://orcid.org/0000-0002-8576-3984
I. Asadi Department of Building Surveying, Faculty of Built Environment, University of Malaya - Centre for Building, Construction & Tropical Architecture (BuCTA), Faculty of Built Environment, University of Malaya https://orcid.org/0000-0001-8724-6916
A. R. Akhiani Centre of Advanced Materials, Department of Mechanical Engineering, University of Malaya https://orcid.org/0000-0001-5567-4430
N. B. Mahyuddin Department of Building Surveying, Faculty of Built Environment, University of Malaya - Centre for Building, Construction & Tropical Architecture (BuCTA), Faculty of Built Environment, University of Malaya https://orcid.org/0000-0002-0827-0975
M. Hashemi Department of Civil Engineering, Faculty of Engineering, University of Malaya https://orcid.org/0000-0002-3233-7295

DOI:

https://doi.org/10.3989/mc.2020.09219

Keywords:

Cement mortar, Thermal conductivity, Heat capacity, Thermal diffusivity

Abstract

The energy required for the heating and cooling of buildings is strongly dependant on the thermal properties of the construction material. Cement mortar is a common construction material that is widely used in buildings. The main aim of this study is to assess the thermal properties of cement mortar in terms of its thermal conductivity, heat capacity and thermal diffusivity in a wide range of grades (cement: sand ratio between 1:2 and 1:8). As there is insufficient information to predict the thermal conductivity and diffusivity of a cement mortar from its physical and mechanical properties, the relationships between thermal conductivity and diffusivity and density, compressive strength, water absorption and porosity are also discussed. Our results indicate that, for a cement mortar with a 28-day compressive strength in the range of 6–60 MPa, thermal conductivity, specific heat and thermal diffusivity are in the range of 1.5–2.7 W/(m.K), 0.87–1.04 kJ/kg.K and 0.89–1.26 (x10^-6 m²/s), respectively. The scanning electron microscope (SEM) images showed that pore size varied from 18 μm to 946 μm for samples with different cement-to-sand ratios. The porosity of cement mortar has a significant effect on its thermal and physical properties. For this reason, thermal conductivity and thermal diffusivity was greater in cement mortar samples with a higher density and compressive strength.

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References

Shafigh, P.; Asadi, I.; Mahyuddin, N.B. (2018) Concrete as a thermal mass material for building applications-A review. J. Build. Eng. 19, 14-25. https://doi.org/10.1016/j.jobe.2018.04.021

Bhattacharjee, B.; Krishnamoorthy, S. (2004) Permeable porosity and thermal conductivity of construction materials. J. Mater. Civil Eng. 16 [4], 322-330. https://doi.org/10.1061/(ASCE)0899-1561(2004)16:4(322)

Tong, X.C. (2011) Characterization methodologies of thermal management materials. In: Advanced Materials for Thermal Management of Electronic Packaging. 2011, Springer. p. 59-129. https://doi.org/10.1007/978-1-4419-7759-5_2

Zhang, W.; Min, H.; Gu, X.; Xi, Y.; Xing, Y. (2015) Mesoscale model for thermal conductivity of https://doi.org/10.1016/j.conbuildmat.2015.08.106

Kim, K.-H.; Jeon, S.-E.; Kim, J.-K.; Yang, S. (2003) An experimental study on thermal conductivity of concrete. Cem. Concr. Res 33 [3], 363-371. https://doi.org/10.1016/S0008-8846(02)00965-1

Demirboǧa, R. (2003) Influence of mineral admixtures on thermal conductivity and compressive strength of mortar. Energ. Build. 35 [2], 189-192. https://doi.org/10.1016/S0378-7788(02)00052-X

Lertwattanaruk, P.; Makul, N.; Siripattarapravat, C. (2012) Utilization of ground waste seashells in cement mortars for masonry and plastering. J Environ Manage. 111, 133-141. https://doi.org/10.1016/j.jenvman.2012.06.032 PMid:22841935

Mo, K.H.; Bong, C.S.; Alengaram, U.J.; Jumaat, M.Z.; Yap, S.P. (2017) Thermal conductivity, compressive and residual strength evaluation of polymer fibre-reinforced high volume palm oil fuel ash blended mortar. Constr. Build. Mater. 130, 113-121. https://doi.org/10.1016/j.conbuildmat.2016.11.005

Olmeda, J.; De Rojas, M.S.; Frías, M.; Donatello, S.; Cheeseman, C. (2013) Effect of petroleum (pet) coke addition on the density and thermal conductivity of cement pastes and mortars. Fuel. 107, 138-146. https://doi.org/10.1016/j.fuel.2013.01.074

Baite, E.; Messan, A.; Hannawi, K.; Tsobnang, F.; Prince, W. (2016) Physical and transfer properties of mortar containing coal bottom ash aggregates from Tefereyre (Niger). Constr Build Mater. 125, 919-926. https://doi.org/10.1016/j.conbuildmat.2016.08.117

Ruiz-Herrero, J.L.; Nieto, D.V.; López-Gil, A.; Arranz, A.; Fernández, A.; Lorenzana, A.; Merino, S.; De Saja, J.A.; Rodríguez-Pérez, M.Á. (2016) Mechanical and thermal performance of concrete and mortar cellular materials containing plastic waste. Constr Build Mater. 104, 298-310. https://doi.org/10.1016/j.conbuildmat.2015.12.005

Widodo, S.; Ma'arif, F.; Gan, B.S. (2017) Thermal Conductivity and Compressive Strength of Lightweight Mortar Utilizing Pumice Breccia as Fine Aggregate. Pro. Eng. 171, 768-773. https://doi.org/10.1016/j.proeng.2017.01.446

Kockal, N.U. (2016) Investigation about the effect of different fine aggregates on physical, mechanical and thermal properties of mortars. Constr. Build. Mater. 124, 816-825. https://doi.org/10.1016/j.conbuildmat.2016.08.008

Zhang, H. (2011) Building materials in civil engineering. Elsevier. https://doi.org/10.1533/9781845699567

Sandin, K. (1995) Mortars for Masonry and Rendering Choice and Application. In: Building Issues, Vol 7. http://lup.lub.lu.se/record/526113.

Malaysian Standard (2003) Portland cement (ordinary and rapid-hardening): Part 1. Specification (Second revision), Malaysia, MS. 522. The Department of Standards Malaysia, (2003).

ASTM C1437 (2007) Standard Test Method for Flow of Hydraulic Cement Mortar, ASTM International, West Conshohocken, PA, 2007. https://

Blázquez, C.S.; Martín, A.F.; Nieto, I.M.; García, P.C.; Pérez, L.S.S.; González-Aguilera, D. (2017) Analysis and study of different grouting materials in vertical geothermal closed-loop systems. Renew. Energy. 114, 1189-1200. https://doi.org/10.1016/j.renene.2017.08.011

Bentz, D.P.; Peltz, M.A.; Duran-Herrera, A.; Valdez, P.; Juarez, C. (2011) Thermal properties of high-volume fly ash mortars and concretes. J. Build. Phys. 34 [3], 263-275. https://doi.org/10.1177/1744259110376613

Othuman, M.A.; Wang, Y. (2011) Elevated-temperature thermal properties of lightweight foamed concrete. Constr. Build. Mater. 25 [2], 705-716. https://doi.org/10.1016/j.conbuildmat.2010.07.016

Waller, V.; De Larrard, F.; Roussel, P. (1996) Modelling the temperature rise in massive HPC structures. In: 4th International Symposium on Utilization of High-Strength/High-Performance Concrete. RILEM SARL Paris.

Lyons, A. (2014) Materials for architects and builders, Routledge, London. https://doi.org/10.4324/9781315768748

Hashemi, M.; Shafigh, P.; Karim, M.R.B.; Atis, C.D. (2018) The effect of coarse to fine aggregate ratio on the fresh and hardened properties of roller-compacted concrete pavement. Constr Build Mater. 169, 553-566. https://doi.org/10.1016/j.conbuildmat.2018.02.216

ASTM C270-19ae1 (2019) Standard Specification for Mortar for Unit Masonry, ASTM International, West Conshohocken, PA, 2019.

Yüksek, S. (2019) Mechanical properties of some building stones from volcanic deposits of mount Erciyes (Turkey). Mater. Construcc. 69 [334], e187. https://doi.org/10.3989/mc.2019.04618

Asadi, I.; Shafigh, P.; Hassan, Z.F.B.A.; Mahyuddin, N.B. (2018) Thermal conductivity of concrete-A review. J. Build. Eng. 20, 81-93. https://doi.org/10.1016/j.jobe.2018.07.002

Real, S.; Gomes, M.G.; Rodrigues, A.M.; Bogas, J.A. (2016) Contribution of structural lightweight aggregate concrete to the reduction of thermal bridging effect in buildings. Constr Build Mater. 121, 460-470. https://doi.org/10.1016/j.conbuildmat.2016.06.018

Hashemi, M., Shafigh, P., Abbasi, M. and Asadi, I. (2019) The effect of using low fines content sand on the fresh and hardened properties of roller-compacted concrete pavement. Case Studies in Construction Materials, 11, e00230. https://doi.org/10.1016/j.cscm.2019.e00230

Chung, S.-Y.; Han, T.-S.; Kim, S.-Y.; Kim, J.-H.J.; Youm, K.S.; Lim, J.-H. (2016) Evaluation of effect of glass beads on thermal conductivity of insulating concrete using micro CT images and probability functions. Cem. Concr. Compos. 65, 150-162. https://doi.org/10.1016/j.cemconcomp.2015.10.011