Experimental Study on Pavement System With Continuous Wet Surface

Akagawa, Hiroyuki; Komiya, Hidetaka

doi:10.3130/aija.65.79_1

Cited by 8 publications

(5 citation statements)

References 1 publication

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“…Additionally, the use of water-retentive materials with high capillary ability has been shown to be an effective solution for mitigating heat. The surface temperature of the proposed material was found to be 10 K cooler than the dry material and 25 K cooler than conventional asphalt [80] Therefore, incorporating RA in pavement systems can be considered a promising strategy in addressing urban heat islands and promoting sustainable urban development.…”

Section: Water Absorption Under Dry Conditionmentioning

confidence: 95%

Investigation Properties of Pervious and Water-Retaining Recycled Concrete to Mitigate Urban Heat Island Phenomena

et al. 2023

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The urban heat island (UHI) effect poses significant challenges to urban environmental quality and public health. Over the decades, research efforts have been made to develop various UHI mitigation strategies, including pavement materials, such as, water-retentive pavement, reflective pavement, and pervious concrete. This paper focuses on the improvement of the hygric and water retention properties of pervious concrete to mitigate UHI phenomena. The hydric and hygroscopic tests were carried out under dry and wet conditions on four different pervious concretes, where natural aggregates were replaced with recycled aggregates at different mass percentages. The results show a significant improvement in these properties by increasing the amount of recycled aggregates incorporated in the mixtures. The mixes made from recycled aggregates alone showed an absorption that reached 75 L more than the control in one cubic meter under wet condition. With an upwelling capacity of up to 30 kg of retained water in a square meter under dry condition, these improvements in water performance represent this permeable concrete as a water retention pavement solution for UHI mitigation. Regarding the mechanical properties, a decrease of 50% in compressive strength was noted only when 100% of the recycled aggregate was incorporated, remaining at 20 MPa for other mixtures.

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Section: Water Absorption Under Dry Conditionmentioning

confidence: 95%

Investigation Properties of Pervious and Water-Retaining Recycled Concrete to Mitigate Urban Heat Island Phenomena

et al. 2023

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“…Continuous water supply is necessary to ensure a stable evaporative cooling effect in water-retentive pavements. Although continuous water supply technologies are available on the market [5], they require a substantial cost and management effort. In contrast, watering on roadways is controllable according to citizen need and budget and allows for continuous improvement in the location and timing of watering.…”

Section: Introductionmentioning

confidence: 99%

“…Relatively continuous evaporation can be expected in pavements with water-retaining materials incorporated between porous aggregates, which are called water-retaining pavements [8]. In addition, Akagawa et al proposed the use of water-retaining sheets using capillary action under the surface of the water-retaining material in order to facilitate more continuous evaporation [5]. Watering on an as-needed basis or periodically is another possible alternative for continuous evaporation.…”

Section: Introductionmentioning

confidence: 99%

“…The heat budget on pavement surfaces was analyzed [22,23]. In addition, surface temperature reduction effects of various types of water-retentive pavements were investigated using field observations [5,[24][25][26][27][28][29]. Recently, a field study of the thermal environmental mitigation effects of roadway watering was conducted in Paris, France [30].…”

Section: Introductionmentioning

confidence: 99%

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Study on An Effective Roadway Watering Scheme for Mitigating Pedestrian Thermal Comfort According to the Street Configuration

Takebayashi

Mori

Tozawa³

2023

Atmosphere

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Continuous measurement of road surface temperature using an infrared camera throughout the summer season was conducted to clarify the duration of surface temperature decrease due to roadway watering according to weather conditions and watering time. Watering during sunny daytime conditions resulted in a maximum reduction in surface temperature of about 10 °C and an average reduction of about 6 °C. The duration of the surface temperature decrease was short (less than 30 min) for sunny days and long (more than 30 min) for cloudy days. On sunny days, if the evaporation rate was faster and the surface temperature decrease was larger, then the duration of the evaporation was shorter. Effective roadway watering plans were investigated according to the street configurations by simulating the thermal environment considering the solar radiation shielding condition of pedestrians on sidewalks. Simulation results in the downtown area of Kobe city indicated that watering the nearby roadways resulted in only 20% and 39% comfort for the northern sidewalks on the east–west road at 10:00 and 16:00, but about 70% comfort for the southern sidewalks and 60–90% comfort for the eastern and western sidewalks. Guiding pedestrians to a shaded sidewalk and then watering the nearby roadway to lower the surface temperature in the sun improves the thermal environment for pedestrians.

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“…In Japan, several studies have been carried out to evaluate the performance of pavements designed to have a beneficial environmental impact [16][17][18][19][20]. However, those studies have evaluated each technology separately and discussed only the reduction in surface temperature as compared with that in the case of a normal pavement.…”

Section: Introductionmentioning

confidence: 99%

Study on Surface Heat Budget of Various Pavements for Urban Heat Island Mitigation

Takebayashi

Moriyama

2012

Advances in Materials Science and Engineering

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The surface heat budgets of various pavement surfaces are studied with the aim of mitigating the urban heat island effect. In this study, the thermal characteristics of pavements are examined using data from observations. The net radiation, surface temperature, temperature under the surface, conduction heat flux, and core weight for each experimental surface are recorded, together with the weather conditions at the time of observation. The latent heat flux is estimated from the observed weight of the cores. The surface heat budget under the same weather conditions is examined, and the sensible heat flux from each target surface is calculated. The parameters that influence the surface heat budget, for example, solar reflectance (albedo), evaporative efficiency, heat conductivity, and heat capacity, are examined. On a typical summer day, the maximum reduction in the sensible heat flux from that on a normal asphalt surface is about 150 W/m2for an asphalt surface with water-retaining material and about 100 W/m2for a cement concrete surface with water-retaining material, depending on the albedo of each surface.

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Experimental Study on Pavement System With Continuous Wet Surface

Cited by 8 publications

References 1 publication

Investigation Properties of Pervious and Water-Retaining Recycled Concrete to Mitigate Urban Heat Island Phenomena

Investigation Properties of Pervious and Water-Retaining Recycled Concrete to Mitigate Urban Heat Island Phenomena

Study on An Effective Roadway Watering Scheme for Mitigating Pedestrian Thermal Comfort According to the Street Configuration

Study on Surface Heat Budget of Various Pavements for Urban Heat Island Mitigation

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