Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 346, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2022.128276
Keywords
Cooling pavement; High thermal conductivity asphalt concrete; Near -surface air temperature; Thermal inertia; Urban heat island effect
Categories
Funding
- National Key R & D Program of China [2018YFE0103800]
- Innovation Talent Promo- tion Program-Scientific and Technological Innovation Team in Shaanxi Province [2017KCT-13]
- National Science Foundation of China [51978068]
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This study proposes a new highly thermally conductive pavement structure and evaluates its cooling effect on the structural layers and near-surface air. Quartzite improves the thermal inertia of asphalt pavement layers, and the highly thermally conductive pavement effectively transfers accumulated heat in the upper layer, reducing temperatures in the structure layers and near-surface air.
This study aims to propose a new highly thermally conductive pavement (HTCP) structure and evaluate the cooling effect of the structural layers and near-surface air. The HTCP consisted of coarse quartzite aggregates with high thermal conductivity instead of limestone. The HTCP and conventional asphalt pavement layers were placed in the environmental chamber. The incandescent lamp was used to simulate solar radiation to analyze the air temperature changes of the structural layers and near-surface air. The test results show that quartzite improves the thermal inertia of asphalt pavement layers. And the HTCP effectively transfers the heat accumulated in the upper layer and reduces the daily temperature of structure layers and near-surface air. However, HTCP releases more sensible heat at night, negatively impacting the urban heat island effect. This research contributes to the improvement of HTCP from an aggregate perspective and provides new ideas for mitigating the UHI effect.
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