scholarly journals Thermal Behavior of an Asphalt Pavement in the Laboratory and in the Parking Lot

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
J. B. Martinkauppi ◽  
A. Mäkiranta ◽  
J. Kiijärvi ◽  
E. Hiltunen
Keyword(s):  
Thermal Behavior ◽  
Asphalt Pavement ◽  
Good Choice ◽  
Heat Energy ◽  
Asphalt Pavements ◽  
Western Coast ◽  
The Sun ◽  
Distributed Temperature Sensing ◽  
Parking Lot ◽  
Heat Collector

The urban, constructed areas are full of buildings and different kinds of pavements and have a noticeable lack of trees and flora. These areas are accumulating the heat from the Sun, people, vehicles, and constructions. One interesting heat collector is the asphalt pavement. How does the heat transfer to different layers under the pavement or does it? What are the temperatures under the pavement in Finland where the winter can be pretty hard? How can those temperatures be measured accurately? These are the main questions this paper gives the preliminary answers to. First the thermal behavior of asphalt and the layers beneath are researched in the laboratory and then the measurement field is bored and dug in the parking in the Western coast of Finland, 63°5′45′′ N. Distributed temperature sensing method was found to be a good choice for temperature measurements. Thermal behavior of pavement has been monitored in different layers and the preliminary results have been published here. The goal of this research is to assess the applicability of asphalt pavements for heat energy collection.

The Spread Wings Motif on Armenian Steles: Its Meaning and Parallels in Sasanian Art

2010 ◽  
Vol 14 (2) ◽  
pp. 201-232 ◽  
Author(s):  
Matteo Compareti
Keyword(s):  
Persian Gulf ◽  
Late Antiquity ◽  
Western Coast ◽  
The Sun ◽  
Persian Empire ◽  
The Caucasus ◽  
The Cross ◽  
The Persian Gulf ◽  
Armenian Literature

AbstractThis paper is a study on the so-called “spread wings”—a particular element of the Sasanian art that is attested also in other regions of the Persian Empire in Late Antiquity, including the western coast of the Persian Gulf and the Caucasus. The spread wings can be observed on Sasanian coins above the royal crowns, which are considered specific for every Sasanian sovereign, supporting astronomical elements, like the crescent, star, and, possibly, the sun. The Arabs and the peoples of the Caucasus who adopted Christianity used the spread wings element as a pedestal for the cross. In Armenian literature, there are some connections between those spread wings and glory, so that a kind of pedestal could be considered a device to exalt or glorify the element above it. The floating ribbons attached to Sasanian crowns had possibly the same meaning and were adopted also outside of proper Persia. In the same way, it could be considered correct to identify those luminaries on Sasanian crowns as divine elements connected with the religion of pre-Islamic Persia.

Brief Acupuncture Treatment for Dermatitis Solaris: A Multicentre Pilot Study

1992 ◽  
Vol 10 (2) ◽  
pp. 64-65
Author(s):  
Raymund Pothmann
Keyword(s):  
Pilot Study ◽  
Acute Treatment ◽  
Acupuncture Treatment ◽  
Heat Energy ◽  
The Sun ◽  
Dermatitis Solaris

The conventional dermatological therapy for urticaria solaris is often problematic in practice. Acute treatment is rarely successful; avoidance of exposure to the sun is isolating for the patient; and prophylaxis is too prolonged or unsafe. According to traditional Chinese pathogenic understanding, acupuncture seems to be the treatment of choice for improving symptoms of superficial heat energy. A maximum of 3 sessions over 3 days using acupoints L1.11 and SP.10 led to significant improvement of acute symptoms within 2 days. This treatment was effective for several weeks, including exposure to the sun, for all 4 patients observed over the whole season. Thus acupuncture should be integrated in the dermatological treatment of so-called solar allergy.

scholarly journals Long-Term Performance of Pavement Structures with Cold In-Place Recycled Base Course

2021 ◽  
Vol 16 (2) ◽  
pp. 48-65
Author(s):  
Audrius Vaitkus ◽  
Judita Gražulytė ◽  
Andrius Baltrušaitis ◽  
Jurgita Židanavičiūtė ◽  
Donatas Čygas
Keyword(s):  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Asphalt Pavements ◽  
Recycled Asphalt ◽  
Binding Agents ◽  
Pavement Structure ◽  
Pavement Structures ◽  
Base Course ◽  
Surface Distress ◽  
Foamed Bitumen

Properly designed and maintained asphalt pavements operate for ten to twenty-five years and have to be rehabilitated after that period. Cold in-place recycling has priority over all other rehabilitation methods since it is done without preheating and transportation of reclaimed asphalt pavement. Multiple researches on the performance of cold recycled mixtures have been done; however, it is unclear how the entire pavement structure (cold recycled asphalt pavement overlaid with asphalt mixture) performs depending on binding agents. The main objective of this research was to evaluate the performance of cold in-place recycled asphalt pavements considering binding agents (foamed bitumen in combination with cement or only cement) and figure out which binder leads to the best pavement performance. Three road sections rehabilitated in 2000, 2003, and 2005 were analysed. The performance of the entire pavement structure was evaluated in terms of the International Roughness Index, rut depth, and pavement surface distress in 2013 and 2017.

scholarly journals Effect of a dual tire pressure on the design parameters of thick asphalt pavements using finite element freeware

DYNA ◽  
2016 ◽  
Vol 83 (196) ◽  
pp. 194-203
Author(s):  
Myriam Rocío Pallares Muñoz ◽  
Julián Andrés Pulecio-Díaz
Keyword(s):  
Finite Element ◽  
Analytical Methods ◽  
Asphalt Pavement ◽  
Field Tests ◽  
Asphalt Pavements ◽  
Design Parameters ◽  
Future Research ◽  
Tire Pressure ◽  
The Cost ◽  
Cost Of Construction

<p>The effect of a dual tire pressure on the design parameters of thick asphalt pavements using finite element freeware EverStressFE©1.0 is evaluated. This is trying to represent more adjusted the footprint shape and intensity of stress generated by the tires of vehicles. To validate the elastic multilayer EverStress©5.0 software was used. The results of the deformations can be concluded that the asphalt pavement designs made with analytical methods may be slightly oversized and consequently increase the cost of construction of pavements. This study marks a route to analyze the sensitivity of various factors that may affect the design of asphalt pavements. Future research is expected to integrate dynamic conditions by introducing results of field tests to full scale.</p>

scholarly journals Research and Analysis on the Principle in Plant Cold Recycling for Foamed Bitumen and Mixture Performance

2021 ◽  
Vol 4 (6) ◽  
Author(s):  
Zecheng Ni ◽  
Shijing Chen ◽  
Yihuan Li ◽  
Hongxi Peng ◽  
Jiawen Liang ◽  
...  
Keyword(s):  
Asphalt Concrete ◽  
Asphalt Pavement ◽  
External Factors ◽  
Asphalt Pavements ◽  
Huge Amount ◽  
Construction Waste ◽  
The Road ◽  
Road Performance ◽  
Foamed Bitumen ◽  
Cold Recycling

The early asphalt pavement in our country severely reduced the road performance due to various external factors during the use process. According to incomplete statistics, there are more asphalt pavements that need to be renovated and repaired every year in China, and the amount of construction waste such as asphalt concrete and other construction waste reaches 1,000. About ten thousand tons. If such a huge amount of construction waste is not used, it will inevitably cause great pollution to the environment. If it can be reused, not only will it be environmentally friendly and energy-saving, it will also save more than one billion yuan in costs. In view of the above problems, this article conducts related Research and Analysis on the Principle in Plant Cold Recycling for Foamed Bitumen and Mixture Performance to provide reference for future projects.

scholarly journals Equivalent temperature for design of asphalt pavements in Poland

2019 ◽  
Vol 262 ◽  
pp. 05010 ◽  
Author(s):  
Marek Pszczola
Keyword(s):  
Design Process ◽  
Asphalt Pavement ◽  
Climatic Conditions ◽  
Design Methods ◽  
Pavement Design ◽  
Asphalt Pavements ◽  
Climatic Data ◽  
Equivalent Temperature ◽  
Calculation Methods

The paper presents application of equivalent temperature for design of asphalt pavements. The calculation methods of equivalent temperature: the Shell method, the French method, the methods that use the AASHTO and the Asphalt Institute fatigue criteria were presented. The results of calculations of equivalent temperature for Polish climatic conditions were presented and discussed. It was shown that different asphalt pavement design methods and utilization of Polish climatic data resulted in various calculated values of equivalent temperature that could be used in the design process.

Thermal Heat Storage Gain of Salinity Gradient Solar Pond Using Evacuated Tube Solar Collectors

2015 ◽  
Vol 1113 ◽  
pp. 800-805 ◽  
Author(s):  
Baljit Singh ◽  
Muhammad Fairuz Remeli ◽  
Alex Pedemont ◽  
Amandeep Oberoi ◽  
Abhijit Date ◽  
...  
Keyword(s):  
Large Scale ◽  
Heat Storage ◽  
Salinity Gradient ◽  
Heat Energy ◽  
Working Fluid ◽  
The Sun ◽  
Solar Ponds ◽  
Solar Pond ◽  
Evacuated Tube Collectors ◽  
Evacuated Tube

This paper investigates the capability of running a system which uses hot fluid from solar evacuated tube collectors to boost the temperature and overall heat storage of the solar pond. The system is circulated by a solar powered pump, producing heat energy entirely from the incoming solar radiation from the sun. Solar evacuated tube collectors use a renewable source of power directly from the sun to heat the working fluid to very high temperatures. Solar ponds are emerging on the renewable energy scene with the capacity to provide a simple and inexpensive thermal storage for the production of heat on a large scale. The results of the performance of the system show a significant heat energy increase into the solar ponds lower convective region, increasing the overall performance of the solar pond.

CONSTRUCTABILITY STUDY OF ASPHALT PAVEMENTS INCORPORATING SHALLOW GEOTHERMAL ENERGY

2018 ◽  
Vol 5 (1) ◽  
Author(s):  
Ali Zalghout ◽  
Nooralhuda Saleh ◽  
Samir Sari Ad Din ◽  
Ghassan Chehab
Keyword(s):  
Pilot Study ◽  
Geothermal Energy ◽  
Large Scale ◽  
Asphalt Pavement ◽  
Permanent Deformation ◽  
Electricity Production ◽  
Asphalt Pavements ◽  
Control Section ◽  
Shallow Geothermal Energy ◽  
And Performance

The incorporation of geothermal energy in heating and electricity production has rapidly increased during the last three decades. This paper focuses on the use of shallow geothermal energy in asphalt pavement, herein called Ground Coupled Hydronic Asphalt Pavement (GCHAP) system. GCHAP consists of a series of pipes embedded within the asphalt layer coupled with another network of pipes embedded in the soil. A circulating fluid acts to exchange the heat energy between the soil and the asphalt layer. The system can be used for cooling the pavement, which results in decreasing permanent deformation in the summer. This paper presents a study on the constructability and performance of such systems on a large-scale section. Numerical analyses and a pilot study were conducted to select the system design components. A 9.6 x 4 meter GCHAP section was constructed on a municipal road in addition to another control section. The secondary network of pipes was placed three meters below the ground. Sensors were embedded within the GCHAP system to record and compare the temperature of the pavement to that of the control section. The results showed that GCHAP section can decrease the pavement temperature leading to an increase in resistance to permanent deformation. Moreover, the constructability study showed the importance of performing a pilot study before constructing the system to ensure the resilience of the pipes.

Impaction of Climate Change on Asphalt Pavements

2013 ◽  
Vol 723 ◽  
pp. 617-622
Author(s):  
Er Hu Yan ◽  
Fu Pu Li ◽  
Rong Ma ◽  
Fei Chen
Keyword(s):  
Climate Change ◽  
Heat Wave ◽  
Asphalt Pavement ◽  
Asphalt Binder ◽  
Climatic Conditions ◽  
Extreme Heat ◽  
Asphalt Pavements ◽  
Asphalt Cement ◽  
The Past ◽  
Change Climate

Climate change is one of the most key global topics well-known in international community. Over the past decades years, the change climate and its impact on asphalt pavement in China is very obvious. Many expressways of asphalt pavement come forth severe rutting failure during only a few days of extensive, long-lasting, extreme heat wave in summer, which resulting in the change of asphalt cement specification and the selection practice of asphalt cement. So it is necessary to review climate change and its impact in the past, and forecast the probable situation in the future. The paper focuses specifically on the issue of asphalt binder selection under changing climatic conditions.

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