Reduction Effects of Urban Heat Island by Water-Retentive Pavement

Kim, Ree Ho; Park, Jong Bin; Mun, Jung Soo; Lee, Jung Hun

doi:10.4028/www.scientific.net/msf.724.147

Cited by 5 publications

(2 citation statements)

References 5 publications

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“…In order to reduce the surface temperature of paved surfaces and to mitigate the urban heat island effect, water-permeable and -retentive pavement systems have been investigated [1][2][3][4], and their applications to road construction are becoming popular [5][6][7]. The important mechanisms of the surface temperature reduction of road pavement systems are the surface gas exchange and vapor transport (i.e., evaporation) in the pavement systems, and the surface temperature reduction depends highly on the evaporation efficiency and water retention property of roadbed materials [8,9].…”

Section: Introductionmentioning

confidence: 99%

Gas Transport Parameters of Recycled Concrete and Clay Brick Aggregate Blended With Autoclaved Aerated Concrete Grains

Kato¹,

Pham²,

Nguyen³

et al. 2021

GEOMATE

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Gas diffusivity (Dp/D0: the ratio of gas diffusion coefficient, Dp, to gas diffusion in free air, D0) and air permeability (ka), and their variations with air-filled porosity () play key roles in surface gas exchange and vapor transport in permeable pavement and water-retentive pavement systems. This study carried out a series of laboratory measurements of Dp/D0 and ka for graded recycled concrete (RC) and clay brick (RCB) aggregates, and RC and RCB blended with autoclaved aerated concrete (AAC) grains at proportions of 20% and 40%. The tested samples were saturated after compaction, and the Dp/D0 and ka were measured during the drying process from saturation to air-dry. Results showed that Dp/D0 and ka of graded RC and RCB decreased most with increased proportions of AAC grains; in particular, the effect of AAC blending on Dp/D0() relationships decreased. For most tested samples, pore-connectivity factor and diffusion-based tortuosity (T) gradually increased with drying, and T values were decreased slightly by blending with AAC grains. Equivalent pore diameter for gas flow values of graded RC and RCB showed a clear decrease with drying; on the other hand, those of AAC blended RC and RCB did not depend on . Combining previous models and fitted T() relations for tested samples, the Dp/D0() relations and MLWs for ka() captured well the values of graded RC and RCB blended with AAC grains, implying that the previous gas transport parameter models would be useful for quick assessment of roadbed materials.

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Section: Introductionmentioning

confidence: 99%

Gas Transport Parameters of Recycled Concrete and Clay Brick Aggregate Blended With Autoclaved Aerated Concrete Grains

Kato¹,

Pham²,

Nguyen³

et al. 2021

GEOMATE

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show abstract

“…A water-retention technique, and the greening of pavements and buildings are effective countermeasures to the urban heat-island phenomenon [3,4,5,6]. Particularly, rooftop greening of buildings is expected as the countermeasure because it can suppress the circumference temperature increase caused by solar-radiant heat, and a room-temperature reduction can also be achieved [7,8,9,10,11,12,13,14,15].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Analyses of Temperature-Reducing-Effect by Heat of Water Evaporation on a Moss-Greening Ceramic Utilizing Waste Silica

et al. 2018

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To recycle silica byproducts and to moderate the heat-island phenomenon, a porous ceramic was prepared by mixing waste silica powder with clay, and then firing the resultant mixture. By exploiting the high water-absorption capacity of the resulting ceramic, a greening material in which the porous ceramic was covered with moss was produced. The suppression effect of the temperature increase caused by solar-radiant heat on the moss-covered ceramic, was investigated quantitatively using the following procedure. First, the surface temperature change of the water-absorbing moss-covered sample during solar-radiant heat reception, and the amount of water that evaporated from the sample were measured simultaneously. Then, the heat of evaporation was estimated from measurements of the rate of water evaporation. Next, to investigate how much the sample temperature was reduced by heat of water evaporation, the temperature change of the sample when the heat of water evaporation was absorbed from the sample, was simulated by performing Finite Element Method (FEM) analysis. The summary of the results was as follows. (1) The primary factor of the temperature-reduction-effects on the moss-covered sample was action of heat of water evaporation. Therefore, the moss-covered sample did not exhibit much of the suppression ability of the temperature increase caused by solar-radiant heat, when the sample did not contain sufficient water. (2) This analytical method enabled us to simulate with a relatively high accuracy, the temperature change of a water-absorbing sample during solar-radiant-heat reception. Especially, the method enabled us to investigate visibly the influence of water evaporation-heat on the sample temperature, in addition to the influences of the emissivity of the sample, and the apparent specific heat and thermal conductivity changes due to water content in the sample.

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Effect of lightweight aggregate gradation on latent heat storage capacity of asphalt mixture for cooling asphalt pavement

Liu

Wang

et al. 2020

Construction and Building Materials

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Reduction Effects of Urban Heat Island by Water-Retentive Pavement

Cited by 5 publications

References 5 publications

Gas Transport Parameters of Recycled Concrete and Clay Brick Aggregate Blended With Autoclaved Aerated Concrete Grains

Gas Transport Parameters of Recycled Concrete and Clay Brick Aggregate Blended With Autoclaved Aerated Concrete Grains

Experimental and Numerical Analyses of Temperature-Reducing-Effect by Heat of Water Evaporation on a Moss-Greening Ceramic Utilizing Waste Silica

Effect of lightweight aggregate gradation on latent heat storage capacity of asphalt mixture for cooling asphalt pavement

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