Materiales de Construcción, Vol 70, No 339 (2020)

Thermal properties of cement mortar with different mix proportions


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

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, Malaysia
orcid 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, Malaysia
orcid https://orcid.org/0000-0001-8724-6916

A. R. Akhiani
Centre of Advanced Materials, Department of Mechanical Engineering, University of Malaya, Malaysia
orcid 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, Malaysia
orcid https://orcid.org/0000-0002-0827-0975

M. Hashemi
Department of Civil Engineering, Faculty of Engineering, University of Malaya, Malaysia
orcid https://orcid.org/0000-0002-3233-7295

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.

Keywords


Cement mortar; Thermal conductivity; Heat capacity; Thermal diffusivity

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