Sulfur-extended asphalt concrete with assessing the surface temperature of roads affecting urban heat island

Abstract

The Urban Heat Island (UHI) is a phenomenon that affects many millions of people worldwide. The higher temperatures experienced in urban areas compared to the surrounding countryside has enormous consequences for the health and wellbeing of people living in cities. The paper studies the temperature dependence of the surface of the asphalt concrete on the air temperature of Hanoi city with a view to determine the road surface temperature compared to the comfort threshold of Vietnamese people. Research data on microclimate of Hanoi city was taken from hydro-meteorological station in the period 2010yr – 2015yr. The paper selects two most famous methods of calculating the surface temperature of asphalt concrete: The Method of Kovalev Y.N (Russia) and the method of “Superpave” method (USA). This review article outlines the contribution that pavements make to the urban heat island (UHI) effect and analyses localized and citywide mitigation strategies against the UHI. Asphalt concrete is one of the most common pavements surfacing materials and is a significant contributor to the UHI effect. Dense asphalt concrete has low albedo and high volumetric heat capacity, which results in surface temperatures reaching upwards to 60°C on hot summer days. Application of sulfur-extended asphalt concrete with advanced properties instead of asphalt concrete reduces the urban heat island effect and increase the quality and life of roads in Hanoi (Vietnam).

Assessing the Effects of Urban Canopy on Extreme Rainfall over the Lake Victoria Basin in East Africa Using the WRF Model

“…Many building materials, such as concrete and asphalt, have good heat-absorption properties. This means that they absorb and retain heat from the sun, leading to higher surface temperatures and contributing to overall warming in urban areas [62][63][64]. Overall, the presence and characteristics of buildings in urban areas can significantly impact local temperatures, leading to higher temperatures compared to the surrounding rural areas.…”

Effects of PET and RFCC on the dynamic modulus, phase angle, and complex viscosity of asphalt concrete

“…So, it could be said that the samples with RFCC have a stiffener than the control samples at high and low temperatures. The average temperature of the flexible pavement surface is 65 0 C in Ho Chi Minh City in the hot seasons [20]; the average temperature of the flexible pavement surface in Ha Noi is 10 0 C in the cold seasons and 60 0 C in the hot seasons [21]; with a significant increase in heavy loads and traffic jams, the flexible pavement is often damaged, such as rutting, slippage cracking, etc. With 1.1 times increase in dynamic modulus at high temperatures and 1.5 times increase in dynamic modulus at low temperatures of HMA using RFCC compared to conventional HMA, applying RFCC to HMA can overcome this damage in flexible pavement in Viet Nam.…”

Reasons for Reduced Moisture Resistance of Sulfur-Extended Asphalt Concrete

“…The authors of works [ 1 , 2 , 3 , 4 , 5 , 6 ] have shown that the use of sulfur as a modifier for asphalt concrete is a promising direction, allowing the expansion of the temperature range of operation of asphalt concrete pavements in the area of high positive temperatures. In addition, in works [ 5 , 6 , 7 ] it is shown that the introduction of sulfur provides a decrease in the amount of bitumen in the asphalt concrete mixture, as well as a decrease in the temperature of preparation and laying The use of sulfur improves not only the operational properties of sulfur asphalt concrete (SEA) but also the technological properties of the mixture.…”