scholarly journals FIELD TEST ON CONFINED-REINFORCED EARTH METHOD USING GEOGRID REINFORCEMENT FOR ASPHALT PAVEMENT

2012 ◽  
Vol 27 (0) ◽  
pp. 89-92 ◽  
Author(s):  
Shinichiro TSUJI ◽  
Naoki TATTA ◽  
Tsutomu ISHIGAKI ◽  
Hideki OHTA
Keyword(s):  
Field Test ◽  
Asphalt Pavement ◽  
Geogrid Reinforcement ◽  
Reinforced Earth

scholarly journals The Influence of the Carbo-Glass Geogrid-Reinforcement on the Fatigue Life of the Asphalt Pavement Structure / Wpływ Zbrojenia Siatka Weglowo–Szklana Na Trwałosc Zmeczeniowa Asfaltowej Nawierzchni Drogowej

2012 ◽  
Vol 58 (1) ◽  
pp. 97-113 ◽  
Author(s):  
J. Górszczyk ◽  
S. Gaca
Keyword(s):  
Fatigue Life ◽  
Asphalt Pavement ◽  
Field Tests ◽  
Traffic Loading ◽  
Geogrid Reinforcement ◽  
Traffic Conditions ◽  
Pavement Structure ◽  
Number Of Cycles ◽  
The One ◽  
Stress Fatigue

Abstract This paper describes the analyses of the fatigue life of the asphalt pavement reinforced with geogrid interlayer under traffic loading. Finite Element ANSYS package with using nCode applications, as well as macros specially designed in APDL programming script and VBA were used to model the considered problem. Our analysis included computation of stress, fatigue life, damage matrix and rainflow matrix. The method applied was the one of fatigue calculation: stress - number of cycles in short S-N. On the basis of the performed high cycle fatigue analysis, the influence of the location of the used geogrid and of its bond with asphalt layers on the fatigue life and the work of the asphalt pavement structure were determined. The study was carried out for three temperature seasons i.e. spring and fall (assumed as one season), winter and summer. The variability of the traffic conditions were taken into account by assuming weekly blocks of traffic loading. The calculations were made using the real values of loading measured in field tests on the German highways by means of HS-WIM weighing system. As a result of the performed tests, it was proved that the use of geogrid-reinforcement may prolong the fatigue life of the asphalt pavement. However, it is required that: the geogrid should be located in the tension zone as low as possible in the structure of the asphalt layers. Moreover, it is necessary to provide high stiffness of the bond between the geogrid and the asphalt layers.

PFWD's Application in the Evaluation of Structural Strength of Field Hot Regeneration Asphalt Pavement

2013 ◽  
Vol 723 ◽  
pp. 141-148 ◽  
Author(s):  
Jian Guo Wei ◽  
Bin Wang
Keyword(s):  
Correlation Analysis ◽  
Field Test ◽  
Dynamic Modulus ◽  
Reliable Method ◽  
Structural Strength ◽  
Asphalt Pavement ◽  
Falling Weight Deflectometer ◽  
Beam Method ◽  
Structure Strength ◽  
Falling Weight

To evaluate the pre and post change of structure strength of old asphalt pavement field hot regeneration, we use the portable falling weight deflectometer method (PFWD) and benkelman beam method (BB) respectively to do the field test research. The field test researches rely on the ANXIN highway old asphalt pavement field hot regeneration project. We got the data about pre and post regenerations asphalt pavement static bending deflection (l0), PFWD dynamic deflection (lp) and PFWD dynamic modulus (EP). The correlation analysis among static bending deflection, PFWD dynamic deflection and PFWD dynamic modulus suggest that PFWD method is a more stable and reliable method than BB method and PFWD method can be a new evaluation technology for the old asphalt pavement field hot regenerations pavement strength.

Evaluation Segregation of SMA-13 Asphalt Pavement by Compactness

2014 ◽  
Vol 587-589 ◽  
pp. 1067-1070
Author(s):  
Chuang Min Li ◽  
An Liu ◽  
Yu Rong Xiao
Keyword(s):  
United States ◽  
Specific Gravity ◽  
Field Test ◽  
Test Data ◽  
Asphalt Pavement ◽  
Evaluation Standard ◽  
Air Voids ◽  
Different Levels ◽  
Early Damage

Segregation is one of the important reasons that cause the early damage of asphalt pavement, so it is of great significance to discuss the standard for evaluating segregation to control quality of pavement during constructing. SMA-13 specimens of different gradation segregation and aggregate-asphalt segregation are designed to discuss the effects of different levels of segregation on air voids and bulk specific gravity of SMA-13 Marshall specimen. And the classification standards for gradation segregation are established based on the test data with reference to the air voids range that proposed by United States. In order to recognize the levels and site of segregation quickly and accurately in the entity project, the ratio of bulk specific gravity and the theoretical maximum specific gravity of standard grading, that is the evaluation standard of compactness, is put forward as the evaluation standard for segregation of SMA-13 asphalt pavement in field test.

scholarly journals Long Term Behaviour of An Asphalt Pavement Structure Constructed on a Geogrid-Reinforced Subgrade Over Soft Soils

2019 ◽  
Vol 14 (3) ◽  
pp. 384-404
Author(s):  
Aurimas Šiukščius ◽  
Viktoras Vorobjovas ◽  
Audrius Vaitkus ◽  
Šarūnas Mikaliūnas ◽  
Atis Zariņš
Keyword(s):  
Load Transfer ◽  
Asphalt Pavement ◽  
Soft Soil ◽  
Soft Soils ◽  
Geogrid Reinforcement ◽  
The Road ◽  
Road Pavement ◽  
On The Road ◽  
Term Performance

Many roads with asphalt pavement are being reconstructed every year, as their quality becomes insufficient by the requirements. As it is well- known, old roads were built not in the very best quality, so doing reconstruction projects in the most cases there were required to deal with soft soils that are under the existing road structure. Geogrid reinforcement was widely used to solve issues of soft soil in Lithuania. There are projects where geogrid reinforcement is used to control road pavement roughness when there are layers of peat or silt under road structure instead of using concrete piles or geosynthetic-encased soil columns. This type of geogrid reinforcement application is unexplained in any normative-technical document but widely used in Lithuania. This application was usually made constructively without any calculations, choosing the reinforced solution by reducing the geogrid tensile strength or layer quantity compared to reinforced load transfer platform over piles. This paper evaluates the long-term influence of geogrid- reinforced subgrade on the roughness of asphalt surfacing and bearing capacity of the road structure when the soft peaty soils stratify in the deeper layers of the subgrade. There were compared the reinforced sections to adjacent sections to see the effect and fortunately a large number of adjacent sections were also strengthened, mostly by lime stabilisation. Therefore, this comparison allows making more insights on the long-term performance of the strengthened subgrade and influence on the road quality. This research gives recommendations on how the geogrids has to be selected to be used in this kind of application.

Soil Pressure Test and Numerical Analysis on Reinforced Earth Retaining Wall of Green Gabion

2014 ◽  
Vol 644-650 ◽  
pp. 5039-5045
Author(s):  
Xiao Yang ◽  
Guo Lin Yang
Keyword(s):  
Numerical Analysis ◽  
Field Test ◽  
Retaining Wall ◽  
Earth Pressure ◽  
Wall Surface ◽  
Soil Pressure ◽  
Reinforced Earth ◽  
Earth Pressures ◽  
Flexible Wall ◽  
Vertical Earth Pressure

Based on reinforced earth retaining wall of green gabion which is built at the site of seventh project Shaoxing-Zhuji Expressway, the research for soil pressure in a cross section which locate at the site of K38+398kmare made by field test and numerical analysis. The horizontal and vertical earth pressure are studied in the construction, The pressures between field test and numerical analysis which depend on FLAC3D are rough similar. With increased of height in filling soil, the earth pressures on the wall toe in 3 direction such as horizon , vertical, 45°are increased ,and then gradually come to stability after construction. With increased of height in filling soil, the vertical earth pressures is increased, but the distribution for earth pressure at the same height is non-uniform. The horizontal earth pressure on the back of wall surface increases fast at first then decreases a little, which is a single peak-shaped, it distributes along the wall height in non-linear form, the maximum occurs at 1/3H. The result between field test and numerical model are different, because the flexible wall surface has a great affection on unload.

Field test for environmental correlates of dispersal in hedgehogs Erinaceus europaeus

2001 ◽  
Vol 70 (1) ◽  
pp. 33-46 ◽  
Author(s):  
Doncaster C. Patrick ◽  
Rondinini Carlo ◽  
Johnson Paul C. D.
Keyword(s):  
Field Test ◽  
Erinaceus Europaeus ◽  
Environmental Correlates
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