Experimental study on anti-icing and deicing performance of polyurethane concrete as road surface layer

2018 ◽  
Vol 161 ◽  
pp. 598-605 ◽  
Author(s):  
Jun Chen ◽  
Xie Ma ◽  
Hao Wang ◽  
Pengyu Xie ◽  
Wei Huang
Keyword(s):  
Experimental Study ◽  
Surface Layer ◽  
Road Surface

scholarly journals Analisis Kebutuhan dan Biaya Alat Berat untuk Pekerjaan Pemadatan Lapisan Permukaan Street-Race Circuit Mandalika

2021 ◽  
pp. 1-8
Author(s):  
A. Fihani ◽  
Hasyim Hasyim ◽  
I.D.M.A. Karyawan
Keyword(s):  
Surface Layer ◽  
Asphalt Concrete ◽  
Road Surface ◽  
Pneumatic Tire ◽  
Total Cost ◽  
Air Compressor ◽  
The Road ◽  
Heavy Equipment ◽  
Dump Trucks ◽  
Base Course

The Street-Race Circuit is being built in the Mandalika Tourism Special Economic Zone (KEK), Central Lombok, West Nusa Tenggara. The construction is targeted to be completed, before the MotoGP event on this circuit is implemented in 2021. One of the infrastructure related to this, which also really needs to be built to support the smooth running of the 2021 MotoGP is the development of access to the circuit location. The analysis carried out includes the calculation of heavy equipment productivity. Heavy equipment productivity is determined based on cycle times, production per hour, number of heavy equipment used, the amount of operating costs per hour. The analysis was carried out for the road surface layer work, namely the Asphalt Concrete Base Course (AC-BC) work. Based on the results of the analysis, it was found that the production for 1 unit of asphalt mixing plant (AMP) was 49.80 tons/hour and 9 units of dump trucks were 2.34 tons/hour. The spreader using the asphalt finisher can spread 109.18 tons/hour. As for the compactor, which is 18.55 tons/hour for 2 units of tandem rollers and 27.47 tons/hour for 1 unit of pneumatic tire roller. Other equipment is 9.96 m2/hour for air compressor and 2.74 liter/hour for asphalt sprayer. Meanwhile, in the Asphalt Concrete Wearing Course (AC-WC) work, several tools have the same productivity as the AC-BC job, namely asphalt mixing plant, air compressor and asphalt sprayer. Meanwhile, 13 units of Dump Trucks amounted to 2,338 tons/hour, 1 unit of asphalt finisher of 72,787 tons/hour, 3 units of tandem rollers of 12,367 tons/hour, and 1 unit of pneumatic tire roller of 18.31 tons/hour. The total cost of using heavy equipment for road surface layer work is Rp. 4,967,657,344. The total cost based on the contract document is Rp. 5,042,082,622. So that there is a difference in costs of Rp. 74,425,278.

scholarly journals Ice Lensing, Thermal Diffusion and Water Migration in Freezing Soil

1967 ◽  
Vol 6 (47) ◽  
pp. 681-694 ◽  
Author(s):  
Andrew C. Palmer
Keyword(s):  
Experimental Study ◽  
Surface Layer ◽  
Ice Nucleation ◽  
Water Migration ◽  
One Dimensional ◽  
Freezing Soil ◽  
Infinite Mass ◽  
Soil Thermal Diffusivity ◽  
Homogeneous Soil ◽  
Water Diffusion Coefficient

When a surface layer of the soil freezes, both heat and water diffuse from the unfrozen soil beneath to the frozen region. Often the soil does not freeze homogeneously but distinct ice lenses form. An analysis of the diffusion and ice nucleation processes suggests conditions under which ice lensing can be expected; in particular, it is shown that multiple ice lenses cannot form unless the soil thermal diffusivity is greater than the water diffusion coefficient. Analysis of a simple one-dimensional case (a semi-infinite mass of homogeneous soil whose surface temperature is suddenly lowered) gives the temperature and water-content fields as functions of time; these agree with those observed in an experimental study of freezing clay.

The Impact of Road Construction Materials Dynamic Modulus Parameters on Road Surface Shearing Stress

2012 ◽  
Vol 178-181 ◽  
pp. 1183-1187
Author(s):  
Er Yong Chuo ◽  
De Qun Wang ◽  
Guo Rui Deng
Keyword(s):  
Surface Layer ◽  
Asphalt Pavement ◽  
Damping Ratio ◽  
Construction Materials ◽  
Road Surface ◽  
Shearing Stress ◽  
Wave Load ◽  
Layer Material ◽  
Driving Speed ◽  
The Impact

At the beginning,we used the ABAQUS to establish a two-dimensional finite element model of typical asphalt pavement, and analysised the changing axiom of road surface shearing stress under the half sine wave load. Also, we studied on the impact of damping ratio and the driving speed on shearing stress. Finally, by using SPSS13.0 software to compare the impact of speed, the surface layer material damping ratio, lower modulus ratio, the thickness of the surface layer and the thickness of the subbase. The results show that, to reduce the cracking damage caused by oversized shearing stress in asphalt pavement, we should first consider the damping ratio of surface layer material, and the most effective method is to use the road-building material of high damping ratio to prevent cracks, at the same time we should raise the driving speed.

Experimental study of pollutant accumulation on an urban road surface

Urban Water ◽  
2002 ◽  
Vol 4 (4) ◽  
pp. 379-389 ◽  
Author(s):  
J Vaze ◽  
Francis H.S Chiew
Keyword(s):  
Experimental Study ◽  
Road Surface ◽  
Urban Road

scholarly journals EXPERIMENTAL STAND AND METHODOLOGY FOR THE ROLLER’S WORKING BODY RESEARCH

2019 ◽  
Vol 16 (4) ◽  
pp. 408-415
Author(s):  
O. Y. Kazakov ◽  
G. V. Kustarev
Keyword(s):  
Experimental Study ◽  
Experimental Research ◽  
Small Area ◽  
Test Bench ◽  
Road Surface ◽  
Movable Part ◽  
Additional Tool ◽  
Experimental Stand ◽  
History Of ◽  
Design Construction

Introduction. The paper researches the sphere of paving with a roller. The authors describe the current situation in the asphalt concrete’s application as a road surface. Moreover, the authors conduct the excursion into the history of material. The paper presents the preconditions that justify the need for creating recommendations, schemes and methods for experimental study of the working body and material under laboratory conditions of various kinds. The aim of the study is to create the stand concept and methods for experimental research of the roller’s working body in the laboratory.Materials and methods. The paper described a laboratory stand for experiments in the sphere of roller’s working equipment. The authors demonstrated the construction made of a base, a stiffener box, guides and a movable part with a frame and equipment, suspended above the compacted material’s container.Results. As a result, the authors presented the detailed methodology for conducting experiments and recommendations for its transformation in the considered sphere. The paper showed all the necessary data for the design, construction of the test bench and experiments with the roller’s working equipment. Discussion and conclusions. Researchers, especially beginners, receive an additional tool for study of dependencies and phenomena that occur during compaction of material by the roller. Therefore, the authors develops the scheme for the research of the roller’s working body in small area conditions and in extensive laboratories.

scholarly journals THE EXPERIMENTAL STUDY OF SHALLOW FLOWS OF LIQUID ON THE AIRPORT RUNWAYS AND AUTOMOBILE ROADS

Transport ◽  
2010 ◽  
Vol 25 (4) ◽  
pp. 394-402 ◽  
Author(s):  
Andrey Beljatynskij ◽  
Olegas Prentkovskis ◽  
Julij Krivenko
Keyword(s):  
Experimental Study ◽  
Traffic Safety ◽  
Water Film ◽  
Reynolds Numbers ◽  
Road Surface ◽  
Moving Vehicle ◽  
The Road ◽  
Shallow Flows ◽  
On The Road ◽  
Effective Water

Hydroplaning or aquaplaning is associated with the complete loss of the grip of a tyre because of the presence of a water film between the tyres of a moving vehicle (an automobile, an airplane, etc.) and the road surface. In this case, a vehicle becomes uncontrollable. Hydroplaning (aquaplaning) occurs when the speed of a vehicle reaches the critical value, when the wheel does not have time enough for water compulsion, which leads to the formation of a permanent water film between it and the road surface. The higher the depth of the water on the road surface under the tyre, the higher the risk of hydroplaning (aquaplaning). In other words, hydroplaning (aquaplaning) is the floating of the wheel on the water wedge. In physical terms, it is the loss of the ability of a tyre of the effective water compulsion from the contact area with the road. As a result, a water film of several millimeters is formed under the wheel, and a vehicle actually floats up. The article presents the results obtained in the experimental study of the flows of liquid, whose depth is comparable with that of depressions and cambers of rough roadway pavement. It is stated that the relationships used for calculating surface flows should be corrected for shallow flows, taking into account the actual roughness of road covering. Shallow flows are mostly laminar. The transition Reynolds numbers are about 3000. The relationships used for calculating shallow flows may be determined more accurately by test pouring of water on the surface of roadway pavement, with further generalization of the data. The experimental research performed is closely related to the study of the problems of aquaplaning and traffic safety of various means of transport.

Dynamic Response of Asphalt Pavement on Semi-Rigid Base due to Heavy Load

2013 ◽  
Vol 405-408 ◽  
pp. 1745-1752
Author(s):  
Li Juan Zhang
Keyword(s):  
Shear Stress ◽  
Surface Layer ◽  
Tensile Stress ◽  
Compressive Stress ◽  
Asphalt Pavement ◽  
Road Surface ◽  
Rigid Base ◽  
Heavy Load ◽  
Vertical Strain ◽  
Surface Deflection

The purpose of this paper is to study dynamic-characteristics of asphalt-pavement on semi-rigid base loaded with moving, heavy-load. Based on transient-dynamics theory, three-dimensional finite-element (FE) model was developed for structural dynamic-responses analysis using ANSYS software. The heavy-duty axle-load model was established according to Belgium-Design Code, and the dynamic-load was simplified as sinusoidal-wave load. For the pavement mechanics indexes (road-surface deflection, the vertical and lateral stress, the shear stress and the strain), the time-history curves and distribution conditions in the structure were presented. Expect tensile-strain at surface-layer, the relationship between axle-load weight and mechanic-indexes are almost linearly proportional. The calculation shows that under moving heavy-load, the surface-layer suffers from rather high vertical compressive-stress and shear-stress, the base and subbase are loaded with high tensile-stress and the subgrade top undergoes large vertical-strain . For asphalt-pavement on semi-rigid loaded with moving, heavy-load, besides the conventional indexes (including road-surface deflection and tensile-stress at the bottom of base or subbase), the design indexes should also include the shear-stress on road surface, the vertical-strain on the top of subgrade and the vertical compressive-stress on road surface.

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