scholarly journals Optimum Pavement Thickness for Rigid Pavement in UP Eastern Region

2021 ◽  
Vol 10 (5) ◽  
pp. 173-181
Author(s):  
Shubham Pandey ◽  
A.K. Sachan ◽  
Anupam Rawat ◽  
Saurabh Singh
Keyword(s):  
Thermal Stresses ◽  
Extreme Temperature ◽  
Weather Conditions ◽  
Eastern Region ◽  
Rigid Pavement ◽  
Load Variations ◽  
Wear And Tear ◽  
Moisture Conditions ◽  
Pavement Foundation ◽  
Pavement Thickness

Highways are important in the growth of the economy of the nation. Pavement distributes and reduces the loads to the subgrade so as not to destruct the pavement foundation and subgrade. Thermal stresses are more vulnerable and to be included as the ability to contract and expand concrete is very less. The roads provide vehicle access to various points in all weather conditions and provide road users with a clean, smooth, and comfortable ride without unnecessary delay or excessive wear and tear. Since the UP eastern region faces tremendous temperature differences, load variations, and moisture conditions. This paper puts an attempt to identify the optimum thickness of the rigid pavement to sustain these extreme temperature variations, high humidity, and various load configurations. In this paper the various configurations of the loads are taken from the IRC 6: 2016 along with the various moisture and temperature data are taken from the Indian Meteorological Department (IMD) ministry of Earth and Science government of India. The paper gives a brief idea of pavement thickness selection. This paper utilizes Finite Element Method (FEM) based Software’s KENPAVE along with ANSYS 12.1 for a better understanding of the critical stress and its positions where the pavement needs attention in the design. All these varying conditions are incorporated in these software’s and the results obtained were in the form of figures, graphs, and deflected shapes. Parametric variation in the pavement section (i.e. variation in thickness of PQC, DLC layer, and in Modulus of Elasticity), variation in poisons ratio and temperature by using these results and doing cost analysis the optimum pavement thickness was obtained.

Evaluation of the Moisture Dependence of Concrete Coefficient of Thermal Expansion and Its Impacts on Thermal Deformations and Stresses of Concrete Pavements

2020 ◽  
Vol 2674 (8) ◽  
pp. 545-555
Author(s):  
Angel Mateos ◽  
John Harvey ◽  
Dulce Rufino Feldman ◽  
Rongzong Wu ◽  
Julio Paniagua ◽  
...  
Keyword(s):  
Experimental Data ◽  
Thermal Expansion ◽  
Thermal Stresses ◽  
Coefficient Of Thermal Expansion ◽  
Concrete Pavements ◽  
Rigid Pavement ◽  
Concrete Overlays ◽  
Thermal Deformations ◽  
Moisture Dependence ◽  
Moisture Conditions

The coefficient of thermal expansion (CTE) is one of the material properties of concrete that has the largest impact on rigid pavement performance. Concrete CTE is typically measured in the laboratory, under saturated conditions, or estimated on the basis of the mix constituents, past experience, or both. Whichever method is used, the mechanistic-empirical design of concrete pavements traditionally assumes a constant value for this material property. This assumption has important consequences in relation to predicting thermal deformations and stresses since the CTE of concrete actually changes with the concrete’s internal moisture conditions. The experimental data presented in this study show that this assumption, together with the way CTE is measured in the laboratory, leads to systematic underestimates of thermal deformations and stresses in concrete pavements. The experimental data come from six concrete overlays of asphalt pavements that were instrumented with thermocouples, relative humidity sensors, and vibrating wire strain gauges to measure the expansion/contraction and bending of the slabs because of temperature and moisture-related actions. The apparent CTE of the overlay slabs reached values up to 65% larger than the CTE measured in the laboratory under saturated conditions. Using finite element method modeling, it was determined that thermal stresses were up to 70% larger than predicted using the saturated CTE.

scholarly journals Early heat waves over Italy and their impacts on durum wheat yields

2015 ◽  
Vol 15 (7) ◽  
pp. 1631-1637 ◽  
Author(s):  
G. Fontana ◽  
A. Toreti ◽  
A. Ceglar ◽  
G. De Sanctis
Keyword(s):  
Durum Wheat ◽  
Mediterranean Region ◽  
Heat Waves ◽  
Extreme Temperature ◽  
Weather Conditions ◽  
Wheat Production ◽  
Arable Crop ◽  
Production Areas ◽  
The Impact ◽  
Concurrent Events

Abstract. In the last decades the Euro-Mediterranean region has experienced an increase in extreme temperature events such as heat waves. These extreme weather conditions can strongly affect arable crop growth and final yields. Here, early heat waves over Italy from 1995 to 2013 are identified and characterised and their impact on durum wheat yields is investigated. As expected, results confirm the impact of the 2003 heat wave and highlight a high percentage of concurrence of early heat waves and significant negative yield anomalies in 13 out of 39 durum wheat production areas. In south-eastern Italy (the most important area for durum wheat production), the percentage of concurrent events exceeds 80 %.

scholarly journals STUDI EVALUASI TEBAL PERKERASAN KAKU PADA RUAS JALAN DRADAH – KEDUNGPRING MENGUNAKAN METODE BINA MARGA 2002

UKaRsT ◽  
2018 ◽  
Vol 2 (2) ◽  
pp. 7
Author(s):  
Nur Azizah Affandi ◽  
Rasio Hepiyanto
Keyword(s):  
Load Condition ◽  
Public Works ◽  
Natural Factor ◽  
Rigid Pavement ◽  
The Road ◽  
Final Project ◽  
Vehicle Load ◽  
Road Planning ◽  
Using Data ◽  
Pavement Thickness

Damage to the dradah-kedungpring road is not only caused by the amount (volume) of the vehicle that exceed the capacity of the road, but in it is also related to various factors namely human factor and natural factor. Overload is a vehicle's axle load condition exceeding the standard load used on the pavement design assumption or the number of operational paths before the age of the plan is reached, or often referred to as premature deterioration.The method of rigid pavement road planning which is made by Depaterment of Public Works that is Bina Marga method cannot be applied in standard planning in the field implementation maximally so that it has weakness which resulted in the early damage on the highway before the achievement of plan age In this final project will produce the planning of rigid Pavement Thickness on Dradah – Kedungpring road Using Bina Marga Method 2002 ", the thickness is produced calculation with actual vehicle load for traffic data in the calculation Thick pavement has been using data from the results of traffic surveys that exist.In the research that has been done on the thickness rigid pavement dradah-Kedungpring road obtained thickness of 24 cm is expected to provide a good service life in accordance with the expected age of the plan. Keywords: Pavement, LHR, CBR, Vehicle Overloading Expenses.

Finite Element Analysis of Casing Material Behavior in Steam Injection Well Operations

2015 ◽  
Vol 799-800 ◽  
pp. 196-200
Author(s):  
Abhilash M. Bharadwaj ◽  
Sonny Irawan ◽  
Saravanan Karuppanan ◽  
Mohamad Zaki bin Abdullah ◽  
Ismail bin Mohd Saaid
Keyword(s):  
Finite Element ◽  
Oil Recovery ◽  
Thermal Stresses ◽  
Oil And Gas ◽  
Extreme Temperature ◽  
Injection Pressure ◽  
Oil And Gas Industry ◽  
Steam Injection ◽  
Material Behavior ◽  
Element Analysis

Casing design is one of the most important parts of the well planning in the oil and gas industry. Various factors affecting the casing material needs to be considered by the drilling engineers. Wells partaking in thermal oil recovery processes undergo extreme temperature variation and this induces high thermal stresses in the casings. Therefore, forecasting the material behavior and checking for failure mechanisms becomes highly important. This paper uses Finite Element Methods to analyze the behavior two of the frequently used materials for casing - J55 and L80 steels. Modeling the casing and application of boundary conditions are performed through Ansys Workbench. Effect of steam injection pressure and temperature on the materials is presented in this work, indicating the possibilities of failure during heating cycle. The change in diameter of the casing body due to axial restriction is also presented. This paper aims to draw special attention towards the casing design in high temperature conditions of the well.

Effect of Extreme Temperature on the Performance of Wind Turbine Blade

2012 ◽  
Vol 522 ◽  
pp. 457-461
Author(s):  
Jia Yang ◽  
Wen Jun Qi
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
Interaction Analysis ◽  
Extreme Temperature ◽  
Weather Conditions ◽  
Wind Turbine Blade ◽  
Temperature Changes ◽  
Performance Change ◽  
Aerodynamic Temperature ◽  
Temperature Loads

According to the Dabancheng wing farm weather conditions from 1971 to 2000, and its extreme temperature conditions, the performance change of 750KW wind turbine blade with them was researched in the article. Import UG Modeling to ANSYS, then achieve the static structural analysis and the heat-structure interaction analysis respectively. The results show that comparing aerodynamic-temperature loads with aerodynamic loads, the stress, strain and displacement of the blade is increased by 13.89%, 10.29% and 0.20%. Therefore, temperature changes have a certain impact on the blade performance. In the future, the temperature will be a necessary consideration during design of blade structure.

scholarly journals GPR APPLIED TO RIGID PAVEMENT FROM SANTOS DUMONT AIRPORT, RJ

2014 ◽  
Vol 32 (2) ◽  
pp. 225
Author(s):  
Welitom Rodrigues Borges ◽  
Luís Anselmo Da Silva ◽  
Luciano Soares Da Cunha ◽  
Raimundo Mariano Gomes Castelo Branco ◽  
Márcio Muniz de Farias
Keyword(s):  
Electromagnetic Wave ◽  
Ground Penetrating Radar ◽  
Rio De Janeiro ◽  
Concrete Slab ◽  
Geophysical Investigation ◽  
Rigid Pavement ◽  
Ground Penetration Radar ◽  
Speed Of Propagation ◽  
Ground Penetrating ◽  
Pavement Thickness

ABSTRACT. This paper presents the results of a research performed by using Ground Penetration Radar (GPR) to evaluate the structure of the rigid pavement ofSantos Dumont Airport in Rio de Janeiro, Brazil. The GPR data profiles were acquired with 250 and 700 MHz shielded antennas. The geophysical investigation wasperformed along of 6 profiles, totaling 1432 meters of GPR sections. For calibration of the speed of propagation of electromagnetic wave were drilled three boreholesuntil the depth of 1.8 m. The results of GPR allowed the precise delineation of reflectors related to geotechnical interfaces (pavement thickness – concrete slab andmacadam) and geological (sand/embankment soil), showing the efficiency of this method in this case study.Keywords: GPR, concrete, rigid pavement, Santos Dumont Airport. RESUMO. Este trabalho apresenta o resultado de uma pesquisa desenvolvida usando Ground Penetrating Radar (GPR) para avaliar a estrutura do pavimento rígido do pátio de manobras de aeronaves do Aeroporto Santos Dumont, no Rio de Janeiro, Brasil. Para isso foram usadas antenas blindadas com frequências de250MHz e de 700 MHz. Os dados de GPR foram adquiridos no modo common offset , ao longo de 6 perfis que totalizam 1432 metros de investigação. Para a calibração da velocidade de propagação da onda eletromagnética foram executados três furos de sondagem até a profundidade de 1,8 m. Os resultados de GPR possibilitaram odelineamento preciso de refletores relacionados a interfaces geotécnicas (espessura do pavimento – revestimento de concreto e do macadame) e geológicas (areia/aterrocom entulho), mostrando a eficiência da aplicação deste método neste estudo de caso.Palavras-chave: GPR, concreto, pavimento rígido, Aeroporto Santos Dumont.

scholarly journals EFFECT OF SOIL STRENGTHENING ON RIGID PAVEMENT THICKNESS

2018 ◽  
Vol 13 (46) ◽  
pp. 46-56
Author(s):  
Ibrahim Ramadan ◽  
Zainab Hussein ◽  
Omar Mohamady
Keyword(s):  
Rigid Pavement ◽  
Pavement Thickness

scholarly journals Artemovets is a new potato cultivar bred in Far East of Russia

2020 ◽  
pp. 24-28
Author(s):  
Н.А. Сакара ◽  
В.И. Леунов ◽  
Т.С. Тарасова ◽  
Е.А. Симаков ◽  
А.В. Митюшкин
Keyword(s):  
Late Blight ◽  
Far East ◽  
Potato Cultivar ◽  
Weather Conditions ◽  
Potato Production ◽  
Source Material ◽  
The State ◽  
Eastern Region ◽  
State Register ◽  
Competitive Test

В результате селекционной работы на Приморской овощной опытной станции выведен среднеспелый сорта картофеля. Основной метод создания сорта – межвидовая гибридизация с использованием в качестве исходного материала лучших сортов мировой коллекции и сложных межвидовых гибридов – доноров тех или иных ценных признаков. Изучали 2010 одноклубневых гибридов из 15 комбинаций селекции ФГБНУ Всероссийский НИИ картофелеводства имени А.Г. Лорха. Принцип подбора исходного материала картофеля соответствовал целевому назначению для юга Дальнего Востока: сорт должен быть среднеспелым и устойчив к фитофторозу. Селекционный материал изучали по общепринятой в России методике. Погодные условия в период проведения исследований (2009–2017 годы) были наиболее благоприятными в 2014 и 2017 годах, когда урожайность гибридов составила 40 т/га и выше, и крайне неблагоприятными в 2016 году из-за избыточного выпадения осадков и эпифитотийного развития фитофтороза, в результате в большинстве случаев урожайность составила всего 8–10 т/га. Сильное развитие фитофтороза также отмечалось в 2009, 2010, 2012, 2013, 2015 и 2017 годах, что дало возможность достоверно оценить селекционный материал на устойчивость к этому очень вредоносному заболеванию картофеля. По результатам оценки из 2010 гибридов до конкурсного испытания дошло только два гибрида, в том числе под селекционным номером 1615–85, который имел существенное преимущество перед стандартом по урожайности и устойчивости к фитофторозу. Этот гибрид 1615–85 под названием Артемовец был передан в государственное испытание в 2017 году. По результатам этого испытания в 2018–2019 годах сорт Артемовец включен в Госреестр селекционных достижений РФ по Дальневосточному региону с 2020 года. As result of breeding work a new potato cultivar is bred at Primorye vegetable breeding experimental station. The main method of creating a potato cultivar is interspecific hybridization using the best cultivars of the world's collection as the source material and complex interspecific hybrids – donors of certain valuable traits. We studied 2010 single-club hybrids from 15 breeding combinations of the All-Russian research Institute of potato production named after A. G. Lorch. The principle of selecting the source material of potatoes corresponded to the intended purpose for the South of the Far East – the cultivar should be medium-ripened and resistant to late blight. Breeding material was studied according to accepted in Russia methodology. Weather conditions during the research period (2009–2017) were most favorable in 2014 and 2017, when the yield of hybrids was 40 t/ha or higher, and extremely unfavorable in 2016 due to excessive precipitation and epiphytotic development of late blight, as a result, in most cases, the yield was only 8–10 t/ha. Strong development of late blight was also noted in 2009, 2010, 2012, 2013, 2015 and 2017, which made it possible to reliably assess the selection material for resistance to this very harmful potato disease. According to the results of the evaluation of 2010 hybrids, only two hybrids reached the competitive test, including under the selection number 1615–85, which had a significant advantage over the standard for yield and resistance to late blight. This hybrid 1615–85 called Artemovets was passed to the state test in 2017. According to the results of this test in 2018–2019, Artemovets cultivar is included in the state register of breeding achievements of the Russian Federation for the far Eastern region from 2020.

Temporal fluctuations in soil water repellency following wildfire in chaparral steeplands, southern California

2005 ◽  
Vol 14 (4) ◽  
pp. 439 ◽  
Author(s):  
K. R. Hubbert ◽  
V. Oriol
Keyword(s):  
Soil Moisture ◽  
Soil Water ◽  
Water Repellency ◽  
Weather Conditions ◽  
Antecedent Rainfall ◽  
Soil Water Repellency ◽  
Soil Wetness ◽  
Moisture Conditions ◽  
East West ◽  
Seasonal Weather

Soil water repellency is particularly common in unburned chaparral, and its degree and duration can be influenced by seasonal weather conditions. Water repellency tends to increase in dry soils, while it decreases or vanishes following precipitation or extended periods of soil moisture. The 15 426 ha Williams Fire provided an opportunity to investigate post-fire fluctuations in water repellency over a 1-year period. Soil water repellency was measured at the surface, and at 2-cm and 4-cm depths along six east–west-positioned transects located within the chaparral-dominated San Dimas Experimental Forest. During the winter and spring, seasonal variation in the degree of surface water repellency appeared to be inversely proportional to antecedent rainfall and soil moisture conditions. Precipitation through December reduced the proportion of surface ‘moderate or higher repellency’ from 49 to 4% as soil wetness increased to 12%. Throughout the summer, soil wetness remained below 2%; however, surface soils remained ‘wettable’, with the proportion of surface ‘moderate or higher repellency’ never returning to the early post-fire amount of 47%. Interestingly, at the 4-cm depth, the proportion of ‘moderate or higher repellency’ remained at levels >25% throughout the summer dry season.

Design of UAV for photogrammetric mission in Antarctic area

2016 ◽  
Vol 231 (9) ◽  
pp. 1660-1675 ◽  
Author(s):  
Tomasz Goetzendorf-Grabowski ◽  
Mirosław Rodzewicz
Keyword(s):  
High Resolution ◽  
Natural Environment ◽  
Extreme Temperature ◽  
Weather Conditions ◽  
Extreme Weather ◽  
Wild Animals ◽  
Low Level ◽  
Level Flight ◽  
Small Uav ◽  
History Of

The history of UAVs is relatively long and many such vehicles are in service for different tasks. They can be used even in environments inhospitable for humans, e.g. because of extreme temperature. Moreover, they can perform a task that is difficult or impossible for a manned aircraft because of its size and usually relatively high airspeed. The photogrammetric tasks belong to this group, especially if we need to take high-resolution pictures during low level flight. The advantages of a small UAV for such mission are more evident if we want to investigate the natural environment, where the wild animals are. The paper presents the small UAV designed for a special task, which is counting of the penguins in Antarctica. Inhabited area, extreme weather conditions, the fearfulness of penguins and the goal of the mission put up certain requirements for the UAV. It had to be a reliable, stable platform, which is able to carry photogrammetric equipment and to perform precise flight to cover all investigated areas. The presented UAV was used on such missions in Antarctica in 2014 and 2015. All mentioned tasks were successfully accomplished.

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