Asphalt pavements absorb and store more heat than natural surfaces. Thus, high temperatures are emitted from conventional asphalt pavements, subsequently releasing heat into the atmosphere and contributing to the urban heat island (UHI) phenomenon. Several cool pavement strategies, including the provision of additives and materials, surface coating and layer design, have been introduced to reduce the impact of UHI. This article provides a detailed review of the thermal properties of these mitigation measures in the context of cool asphalt pavements. The literature can be divided into three segments. The first segment discusses the impact of pavements on UHI and heat transfer mechanisms in pavements. The second segment focuses on various thermo physical properties that play an important role in mitigation measures; these properties include albedo (α), emissivity (e), solar reflective index, thermal conductivity (k), specific heat capacity (Cp) and thermal diffusivity. The third segment discusses cool asphalt pavement strategies which specifically cover the ability of the pavement to absorb and reflect solar energy on the basis of the materials and treatments used. The literature reveals that cooling strategies that deal with the pavement surface are important due to its direct incident solar effect, which depends on surface colour, material, shape and roughness. By using high-albedo and high-emissivity surfaces, the pavement can store less heat and lower the surface temperature. These results can also be achieved by designing the materials and pavement layers with low thermal conductivity and high specific heat capacity to reduce thermal diffusivity and pavement temperature and thus combat the heat radiated by the asphalt pavement.

Thermal performance of cooling strategies for asphalt pavement: A state-of-the-art review

A review on the heat transfer in asphalt pavements and urban heat island mitigation methods

This study conducts an experimental programme to investigate the possibility of utilising a binary combination of red mud (RM) and slag in the form of alkali-activated slag-RM (AASR) as a useful ma...

Thermo- mechanical properties of alkali-activated slag–Red mud concrete

Effect of Aggregate Gradation and Asphalt Mix Volumetrics on the Thermal Properties of Asphalt Concrete

Thermal properties of paving materials are essential for estimating temperature distribution in semi-rigid pavements. Literature reported that the thermal parameters varied widely and were most independent of temperature. This paper proposed an innovative test setup to determine the thermal conductivity and diffusivity of hot mix asphalt (HMA) and cement-treated base (CTB) materials. The experimental results indicated that the thermal properties of the paving materials linearly increased with surface temperature. Field temperature monitoring in semi-rigid pavement was also conducted at different depths of HMA and CTB. The heating rate of any location inside the pavement was found approximately twice the heat release. Such obtained thermal parameters and the pavement surface temperature from field monitoring served as inputs for numerical simulations based on ANSYS programme. Using temperature-related thermal properties in the modelling exhibited higher accuracy in predicting temperature distribution in the semi-rigid pavement than those independent of temperature from the literature. 

Temperature-related thermal properties of paving materials: experimental analysis and effect on thermal distribution in semi-rigid pavement

Measuring the Thermal Properties of Pavement Materials

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Measuring the Thermal Properties of Pavement Materials