Use phase assessment of photocatalytic cool pavements

Baral, Aniruddha; Sen, Sushobhan; Roesler, Jeffery R.

doi:10.1016/j.jclepro.2018.04.155

Cited by 30 publications

(9 citation statements)

References 28 publications

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“…These effects were compared between gray and white cement, along with a reference to cement without TiO 2 . The environmental benefits of the photocatalytic concrete were inferred in terms of concluding the pavement life cycle assessment (LCA) [ 109 , 110 ].…”

Section: No X Removalmentioning

confidence: 99%

Recent Progress in the Abatement of Hazardous Pollutants Using Photocatalytic TiO2-Based Building Materials

et al. 2020

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Titanium dioxide (TiO2) has been extensively investigated in interdisciplinary research (such as catalysis, energy, environment, health, etc.) owing to its attractive physico-chemical properties, abundant nature, chemical/environmental stability, low-cost manufacturing, low toxicity, etc. Over time, TiO2-incorporated building/construction materials have been utilized for mitigating potential problems related to the environment and human health issues. However, there are challenges with regards to photocatalytic efficiency improvements, lab to industrial scaling up, and commercial product production. Several innovative approaches/strategies have been evolved towards TiO2 modification with the focus of improving its photocatalytic efficiency. Taking these aspects into consideration, research has focused on the utilization of many of these advanced TiO2 materials towards the development of construction materials such as concrete, mortar, pavements, paints, etc. This topical review focuses explicitly on capturing and highlighting research advancements in the last five years (mainly) (2014–2019) on the utilization of various modified TiO2 materials for the development of practical photocatalytic building materials (PBM). We briefly summarize the prospective applications of TiO2-based building materials (cement, mortar, concretes, paints, coating, etc.) with relevance to the removal of outdoor/indoor NOx and volatile organic compounds, self-cleaning of the surfaces, etc. As a concluding remark, we outline the challenges and make recommendations for the future outlook of further investigations and developments in this prosperous area.

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Section: No X Removalmentioning

confidence: 99%

Recent Progress in the Abatement of Hazardous Pollutants Using Photocatalytic TiO2-Based Building Materials

et al. 2020

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“…This could be achieved using a concrete overlay (white-topping) [89,90]. Next, in the Reflective Concrete Pavements scenario, the albedo of the typical concrete was increased to a value of 0.50, which is a reasonable long-term albedo that can be expected from in-service reflective concrete pavements, such as one made with white cement [91].…”

Section: Strategiesmentioning

confidence: 99%

Cool Pavement Strategies for Urban Heat Island Mitigation in Suburban Phoenix, Arizona

et al. 2019

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Urban areas are characterized by a large proportion of artificial surfaces, such as concrete and asphalt, which absorb and store more heat than natural vegetation, leading to the Urban Heat Island (UHI) effect. Cool pavements, walls, and roofs have been suggested as a solution to mitigate UHI, but their effectiveness depends on local land-use patterns and surrounding urban forms. Meteorological data was collected using a mobile platform in the Power Ranch community of Gilbert, Arizona in the Phoenix Metropolitan Area, a region that experiences harsh summer temperatures. The warmest hour recorded during data collection was 13 August 2015 at 5:00 p.m., with a far-field air temperature of about 42 ∘ C and a low wind speed of 0.45 m/s from East-Southeast (ESE). An uncoupled pavement-urban canyon Computational Fluid Dynamics (CFD) model was developed and validated to study the microclimate of the area. Five scenarios were studied to investigate the effects of different pavements on UHI, replacing all pavements with surfaces of progressively higher albedo: New asphalt concrete, typical concrete, reflective concrete, making only roofs and walls reflective, and finally replacing all artificial surfaces with a reflective coating. While new asphalt surfaces increased the surrounding 2 m air temperatures by up to 0.5 ∘ C, replacing aged asphalt with typical concrete with higher albedo did not significantly decrease it. Reflective concrete pavements decreased air temperature by 0.2–0.4 ∘ C and reflective roofs and walls by 0.4–0.7 ∘ C, while replacing all roofs, walls, and pavements with a reflective coating led to a more significant decrease, of up to 0.8–1.0 ∘ C. Residences downstream of major collector roads experienced a decreased air temperature at the higher end of these ranges. However, large areas of natural surfaces for this community had a significant effect on downstream air temperatures, which limits the UHI mitigation potential of these strategies.

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“…In order to model the local microclimate of the parking lot area, the 3D computational fluid dynamics (CFD) simulation tool from ENVI-met was used, which models the interaction between pavements, buildings, plants, and air (31). This model has been widely used in literature to study the microclimatic effects of the urban form, vegetation, and surfaces including pavements in urban areas (24,(32)(33)(34)(35)(36)(37)(38)(39). The model solves the Navier-Stokes equations for airflow, the heat and moisture transport equations for temperature and humidity, and several semiempirical models for turbulence and the effect of vegetation (31,40,41).…”

Section: Microclimatic Modelmentioning

confidence: 99%

“…The second scenario, “New Asphalt Parking Lot,” represents the parking lot as it would have been when it was first constructed, with a low albedo of 0.05 corresponding to newly paved asphalt ( 22, 42 ). The third scenario, “Reflective Parking Lot,” replaces the existing asphalt surface with a reflective one that has an albedo of 0.50, which can correspond to a reflective coating or white cement concrete ( 35, 43 ).…”

Section: Microclimatic Studymentioning

confidence: 99%

Reflective Parking Lots for Microscale Urban Heat Island Mitigation

Sen

Fernandèz

Roesler

2020

Transportation Research Record: Journal of the Transportation R

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Paved surfaces, especially parking lots, occupy a significant proportion of the horizontal surface area in cities. The low albedo of many of these parking lots contribute to the urban heat island (UHI) and affect the local microclimate around them. The albedo of six parking lots in Champaign-Urbana, U.S., was measured using a ground-based albedometer and was found to vary between 0.18 and 0.28, with a statistically significant variation in albedo at different points within each parking lot. The numerical model ENVI-met was then employed to model the microclimate around one of these lots to examine the potential of increasing its albedo to mitigate UHI. The higher albedo decreased the air temperature over the parking lot by about 1°C. Furthermore, the Universal Thermal Climate Index (UTCI), which combines the effects of air temperature, reflected radiation, wind speed, clothing, metabolism, and humidity, demonstrated that increasing the albedo of the parking lot could improve overall pedestrian thermal comfort and even eliminate it during several hours of the day, and thus mitigate the UHI effect.

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Use phase assessment of photocatalytic cool pavements

Cited by 30 publications

References 28 publications

Recent Progress in the Abatement of Hazardous Pollutants Using Photocatalytic TiO2-Based Building Materials

Recent Progress in the Abatement of Hazardous Pollutants Using Photocatalytic TiO2-Based Building Materials

Cool Pavement Strategies for Urban Heat Island Mitigation in Suburban Phoenix, Arizona

Reflective Parking Lots for Microscale Urban Heat Island Mitigation

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