scholarly journals Recent Studies on the Properties of Pervious Concrete; A Sustainable Solution for Pavements and Water Treatment

2021 ◽  
Vol 31 (3) ◽  
pp. 54-84
Author(s):  
Ramalingam Vijayalakshmi
Keyword(s):  
Coarse Aggregate ◽  
High Strength ◽  
Environmental Benefits ◽  
Pervious Concrete ◽  
Heat Island ◽  
Hydraulic Efficiency ◽  
Aggregate Gradation ◽  
Run Off ◽  
Urban Heat

Abstract Pervious concrete a sustainable solution with limited fines or no fines and interconnected voids, has many environmental benefits, such as reducing the stormwater run-off, improving the groundwater table, reducing water pollution, and mitigating urban heat island. Many research works have been done in Pervious Concrete (PC) by varying different parameters such as, types of aggregate, aggregate gradation, water-to-cement (w/c) ratio, cement-to-aggregate ratio, geopolymer binder, ultra-high strength Matrix and compaction techniques. All these parameters have direct influences on the strength, porosity, permeability, hydraulic efficiency and durability characteristics of PC. The main aim of this paper is to review the recent work carried out in pervious concrete under six different categories (i) Effect of binders, coarse aggregate, admixtures and fibers used in PC (ii) Mechanical and durability properties (iii) pore structure characteristics (iv) Study on Clogging Effect (v) Role of PC in the water purification process and (vi) Numerical model in PC.

scholarly journals Environmental systematics and astronomical refraction II

1979 ◽  
Vol 89 ◽  
pp. 13-25
Author(s):  
James A. Hughes
Keyword(s):  
Three Dimensional ◽  
Urban Heat Islands ◽  
Zenith Distance ◽  
Heat Island ◽  
Heat Islands ◽  
Perturbation Field ◽  
Systematic Effects ◽  
Urban Heat ◽  
Astronomical Refraction

The role of urban heat islands in producing systematic isopycnic tilts is explored in more detail, and with greater rigor, than in Part I of this series. (Perth, 1974).Specifically, a three dimensional integration is carried out, and light rays are, in effect, “traced” through the resulting perturbation field by evaluating the integral of anomalous refraction. This is done for various values of the parameters, viz., wind direction and observatory location relative to the heat island, strength of the central perturbation, zenith distance of the observed object, etc.It is stressed that heat islands are not the only source of such systematic effects.Finally, a brief discussion of some possible methods of determining observationally the effects here treated theoretically, as well as other site dependent effects, is appended.

The role of one large greenspace in mitigating London's nocturnal urban heat island

2014 ◽  
Vol 493 ◽  
pp. 662-671 ◽  
Author(s):  
Kieron J. Doick ◽  
Andrew Peace ◽  
Tony R. Hutchings
Keyword(s):  
Urban Heat Island ◽  
Heat Island ◽  
Urban Heat

scholarly journals Role of Fog in Urban Heat Island Modification in Kraków, Poland

2018 ◽  
Vol 18 (1) ◽  
pp. 178-187 ◽  
Author(s):  
Anita Bokwa ◽  
Agnieszka Wypych ◽  
Monika J. Hajto
Keyword(s):  
Urban Heat Island ◽  
Heat Island ◽  
Urban Heat

scholarly journals A review on characteristics of pervious concrete using recycled aggregate

2021 ◽  
Vol 10 (1) ◽  
pp. 1-8
Author(s):  
Aaliya Navaz ◽  
Anju Paul
Keyword(s):  
Coarse Aggregate ◽  
Ground Level ◽  
Environmental Benefits ◽  
Pervious Concrete ◽  
Recycled Aggregate ◽  
Fine Aggregate ◽  
Concrete Compressive Strength ◽  
Coarse Aggregates ◽  
Natural Aggregates ◽  
Pass Through

Pervious concrete is a mixture of cement, coarse aggregate mixed with water. The absence of fine aggregate helps increase the voids and water can pass through these gaps and reaches to ground level. The use of recycled coarse aggregates from construction and demolition is a sustainable solution with many environmental benefits and also reduces the number of virgin aggregates to be created, hence reducing the extraction of natural resources. This paper reviews the research developments of pervious concrete by replacing natural aggregates with different percentages of recycled coarse aggregate. The papers under consideration of review have conducted to identify various properties of pervious concrete such as mechanical and hydrological properties. Keywords— pervious concrete, compressive strength, permeability

scholarly journals The Albedo of Pervious Cement Concrete Linearly Decreases with Porosity

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Rui Zhang ◽  
Guosheng Jiang ◽  
Jia Liang
Keyword(s):  
Portland Cement ◽  
Urban Heat Island ◽  
Spectral Reflectance ◽  
Pervious Concrete ◽  
Heat Island ◽  
Portland Cement Concrete ◽  
Cement Concrete ◽  
Solar Absorption ◽  
Island Effect ◽  
Urban Heat

Pervious pavements have been advocated as a potential countermeasure to the urban heat island effect. To understand if pervious pavements stay cooler than conventional pavements, the albedo of the pervious concrete must be understood. This study measured the albedo of pervious concrete with different porosity. Four Portland cement concrete mixes were casted, using designed amounts of sand to vary the porosity of the pervious concrete samples. The samples were sliced and the spectral reflectance and albedo of the sliced samples were measured and analyzed. It is found that the albedo of pervious concrete decreases linearly with the increase of the porosity. The albedo of a pervious Portland concrete varies from 0.25 to 0.35, which is 0.05~0.15 lower than the albedo of conventional cement concrete. Due to this lower albedo, it should be cautious to develop pervious concrete to battle with urban heat island unless the evaporation of pervious concrete is promoted to compensate the additional solar absorption caused by the low albedo.

scholarly journals The Role of Rural Variability in Urban Heat Island Determination for Phoenix, Arizona

2004 ◽  
Vol 43 (3) ◽  
pp. 476-486 ◽  
Author(s):  
Timothy W. Hawkins ◽  
Anthony J. Brazel ◽  
William L. Stefanov ◽  
Wendy Bigler ◽  
Erinanne M. Saffell
Keyword(s):  
Urban Heat Island ◽  
Heat Island ◽  
Urban Heat

scholarly journals Variabilidad temporal de la isla de calor urbana de la ciudad de Zaragoza (España)

2021 ◽  
Author(s):  
José M. Cuadrat ◽  
Roberto Serrano-Notivoli ◽  
Samuel Barrao ◽  
Miguel Ángel Saz ◽  
Ernesto Tejedor
Keyword(s):  
Urban Heat Island ◽  
Urban Area ◽  
City Centre ◽  
Heat Island ◽  
Time Data ◽  
Wind Speeds ◽  
Urban Heat ◽  
The City ◽  
Temporal Intensity

We analyse the temporal intensity and variability of the urban heat island (UHI) in the city of Zaragoza (Spain), and assess the role of wind as an important atmospheric conditioning factor. Based on the time data provided by the city’s urban mesoscale meteorological network, the temperature difference between two observatories, one urban (Plaza Santa Marta) and one located on the outskirts of the urban area (Ciudad Deportiva), was calculated for the 2015-2020 period. The results indicate that the temperature in the city centre is very frequently 1º or 2ºC higher than in the surroundings, sometimes even more than 8ºC higher. The UHI is more intense in summer (an average of 2.5ºC per hour) than in winter (an average of 2.2ºC per hour) and more intense during the night than during the day. The maximum UHI value is reached in calm atmospheric situations; however, this value is very limited with winds over 10 km/h and it practically disappears with wind speeds over 50 km/h.

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