scholarly journals Conditions modelling of low-temperature cracks existence in the road upper layer

2020 ◽  
Vol 1614 ◽  
pp. 012100
Author(s):  
T Gavrilov ◽  
G Kolesnikov
Keyword(s):  
Low Temperature ◽  
The Road

Research of Water Damage Resistance Performance of CAM in Low Temperature Condition

2013 ◽  
Vol 723 ◽  
pp. 157-162
Author(s):  
Jian Li ◽  
Qu Chao ◽  
He Ping
Keyword(s):  
Low Temperature ◽  
Atmospheric Pressure ◽  
Asphalt Pavement ◽  
Natural World ◽  
Chloride Salt ◽  
The Road ◽  
Normal Atmospheric Pressure ◽  
Water Damage ◽  
Resistance Performance ◽  
Complex Polymer

Under normal atmospheric pressure conditions, volume suddenly increases about 11% when the water freezes and decreased when the ice melts. The pressure can reach up to 2500 times of atmospheric pressure in the closed space when the water freezing. This is a very important characteristic of the natural world and the industrial. In low temperature condition, the snow on the pavement is easy to melt and freeze, and it will affect the road safety, increase the cracking of the road and accelerate asphalt pavement water damage. Bitumen is a mixture consisting of some extremely complex polymer hydrocarbons and hydrocarbon derivatives of non-metallic (oxygen, sulfur, nitrogen). Deicing salt is used to prevent freezing in that area, chloride salt is its main ingredient. When the water melting point reduced, it is not easy to icing but to penetrate the asphalt pavement. If the temperature is continued to reduce, salt solution will still freezing. At last, the pavement will form water damage in repeated freeze-thaw cycles conditions.

scholarly journals Study on Laboratory Experimental Pavement Performances of SEAM Modified Asphalt Mixture

2019 ◽  
Vol 136 ◽  
pp. 03010
Author(s):  
Ma Qingna ◽  
Zhao Zhiqin ◽  
Xu Qian ◽  
Sun Feng
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Asphalt Mixture ◽  
Temperature Stability ◽  
Water Stability ◽  
High Temperature Stability ◽  
Modified Asphalt ◽  
The Road ◽  
Road Performance ◽  
Property Index

Adding sulphur dilution asphalt modifier SEAM to asphalt mixture is not only a modifier of asphalt mixture, but also an additive of asphalt mixture. When the modifier is added into the asphalt mixture, the road performance of the asphalt mixture can be improved. This paper studies SEAM modified asphalt mixture the Marshall property index, temperature stability, Water stability and fatigue feature in the Laboratory. On the based of the result of the experiment and analysis, SEAM can improve the high temperature stability, Water stability and fatigue feature. But the low temperature stability can’t improve.

The Analyze Study of Compacting Temperature and Road Performance of Warm Mix Asphalt Mixture (LEADCAP)

2013 ◽  
Vol 361-363 ◽  
pp. 1681-1688 ◽  
Author(s):  
Hai Sheng Zhao ◽  
Wei Chen ◽  
Xiao Yan Wang
Keyword(s):  
Low Temperature ◽  
Dynamic Modulus ◽  
Asphalt Mixture ◽  
Temperature Stability ◽  
Organic Additive ◽  
Bending Test ◽  
High Temperature Stability ◽  
The Road ◽  
Indirect Tension ◽  
Road Performance

This paper used one kind of organic additive LEADCAP to reduce the compacting temperature of SBS WMA mixture, and compared the WMA mixture compacted by superpave gyratory compactor (SGC) with HMA mixture to determine the compacting temperature of WMA mixture. Rutting test, low temperature bending test, freeze-thaw indirect tension test, Hamburg Wheel-Track test and dynamic modulus were carried out to evaluate the road performance of WMA mixed with LEASCAP. The test result showed that the WMA mixed with LEADCAP had well performed high temperature stability, low temperature stability, water stability, rutting cracking resistance, and high dynamic modulus, the compacting temperature were 127 °C, and affectively reduced the compacting temperature of SBS WMA mixture.

scholarly journals Tangential forces in the contact area of upper road layer with the base

2018 ◽  
Vol 239 ◽  
pp. 05012 ◽  
Author(s):  
Timmo Gavrilov ◽  
Gennady Kolesnikov ◽  
Konstantin Khoroshilov
Keyword(s):  
Low Temperature ◽  
Contact Area ◽  
Piecewise Linear ◽  
Shear Stresses ◽  
Shear Forces ◽  
The Road ◽  
Concrete Layer ◽  
Order Polynomial ◽  
Low Temperature Cracking ◽  
Tangential Forces

Low-temperature cracking is one of the main reasons for the deterioration of the upper layer of roads in regions with cold winters. A large number of works focused on deterioration prevention are known, however the interdisciplinary problem of low-temperature cracking remains relevant. The important, but insufficiently studied factor is the distribution of normal and tangential (shear) forces acting on the upper layer of the road. The objective of the current study was to clarify insight about the distribution of tangential forces in the contact area of the upper layer of the road with the base. There are works in which it is assumed that these forces are distributed by a piecewise linear law. We propose a mechanical and mathematical model and an analytical solution to the problem of the distribution of shear forces in the contact area of the upper layer with the base. The main result of the study: it is found that the distribution of shear forces in the segment of the asphalt concrete layer is described by a second-order polynomial. However, the shear stresses are distributed linearly over the entire length of the segment and reach the highest modulo values in the area of the end sections of the segment. The results of the presented study clarify the understanding of functioning of the upper road layer at low temperatures. By that, the contribution to the solution of the problem of increasing the crack resistance of roads in regions with cold winters is made.

The Weakening Effect of the Snow-Melting Agent on the Performance of Municipal Asphalt Pavement in the Severe Cold Region

2014 ◽  
Vol 953-954 ◽  
pp. 1604-1608 ◽  
Author(s):  
Yan Hui Liu ◽  
Hong Zhang ◽  
Xiao Long Wang ◽  
Liang Li
Keyword(s):  
Low Temperature ◽  
Asphalt Pavement ◽  
Cold Region ◽  
Snow Melting ◽  
Stiffness Modulus ◽  
The Road ◽  
Rule Changes ◽  
Bending Failure ◽  
Property Index ◽  
Temperature Crack

According to the phenomenon that the road would get frozen during the severe cold region in the high latitude area of Inner Mongolia, this paper study on low temperature crack resistance indexes of the asphalt pavement-the bending stiffness modulus, changing rules of stiffness modulus that is the low temperature anti-crack property index of the asphalt pavement, and bending failure characteristic. The rule changes with the density of the commonly used Chlorine salt snowmelt agent changes. Then the paper analyses how does the Chlorine salt snowmelt agent exert influences on the two kinds of aggregates of bituminous concrete. Finally, it is concluded that the snow-melting agent can weaken the performance of the asphalt pavement. The existing snow-melting agent will be replaced by Affordable and efficient pollution-free deicing in the future.

Evaluation of Polymer-Modified Warm-Mix Asphalt Used for Gobi Road

2013 ◽  
Vol 723 ◽  
pp. 320-327
Author(s):  
Yong Joo Kim ◽  
Sung Lin Yang ◽  
Yeong Min Kim ◽  
Sung Do Hwang ◽  
Soo Ahn Kwon ◽  
...  
Keyword(s):  
Low Temperature ◽  
Heavy Traffic ◽  
Asphalt Binder ◽  
Weather Condition ◽  
Warm Mix Asphalt ◽  
Bending Test ◽  
Test Results ◽  
The Road ◽  
Polymer Modifier ◽  
On The Road

South Gobi road of 240-km flexible pavement was constructed from UKHAA KHUDAG to GASHUUN SUKHAIT in South Gobi, Mongolia in 2011. However, due to the heavy traffic and severe weather condition, early distresses have occurred from a length of 100-km flexible pavements in South Gobi road after one year service life. In order to enhance crack and rutting resistances and to improve paving quality control in South Gobi road, polymer modifier is selected to reduce rutting at high temperature and cracking at low temperature and warm-mix asphalt (WMA) additive is selected to reduce the mixing and compacting temperatures and provide better compaction on the road and the ability to haul paving mix for longer distances. This paper adopted comprehensive asphalt tests to evaluate physical and rheological characteristics, and crack potential at low temperature for use in a South Gobi road. Laboratory tests were performed on asphalt binder with a polymer modifier and warm-mix asphalt additive by conducting the following tests: softening test, ductility test, SuperpaveTMtest and cold bending test. These test results of asphalt binder with SBS polymer modifier and warm-mix asphalt additive were significantly more positive than those of typical asphalt binder. On the basis of test results, it can be concluded that the asphalt binder with SBS polymer modifier and WMA additive is stronger and less susceptible to rutting and crack than typical asphalt binder used in South Gobi.

scholarly journals Heat setting system development of bridge floor surface using low temperature geothermal energy

2021 ◽  
Vol 8 (3) ◽  
Author(s):  
Sergey Kostenko ◽  
Aleksandr Piskunov ◽  
Nikita Ganin
Keyword(s):  
Low Temperature ◽  
Geothermal Energy ◽  
Control Method ◽  
Heat Setting ◽  
Difficult Situation ◽  
Best Available Technologies ◽  
The Road ◽  
Floor Surface ◽  
Study Results ◽  
On The Road

Multilevel transport interchanges play a decisive role in the road infrastructure both throughout the world and in Russia. Significant problems of the safe operation of multi-level highways in the general metropolitan traffic system and the country territory, in general, are associated with the need to thoroughly clear them of snow and ice during winter and off-season periods. The simplest, most obvious, and historically proven non-mechanical ice control method is using the chemical reagents mixtures. Despite the fact that the quality of the original anti-ice chemical products is constantly being improved, the reagents composition is updating, the target operation remains unchanged — a decrease in the ice and snow melting temperature point. Unfortunately, in the process of melting with heavy snowfall, the concentration and, accordingly, the brine viscosity increases, leading to «oiling» of the asphalt pavement, thereby worsening the already difficult situation on the road. One of the attractive ways to keep the roadway in proper condition is to heat it to get rid of ice. Direct heating methods such as central heating or electric heating are too costly and economically unfeasible. It seems promising to use low-temperature geothermal energy, which will significantly reduce energy costs and increase the transport projects’ economic attractiveness. This work is devoted to the study of the practical applicability of the bridge floor surface heat setting technology using low-temperature geothermal energy as part of the «Best available technologies» concept implementation in accordance with GOST R 56828.15-2016 in terms of infrastructure facilities energy efficiency. Based on the work results, the authors provide the study results and numerical modeling, as well as their comparison. The results presented in this article are a part of the dissertation research «New technological solutions development for the bridge floor surface at transport interchanges» Kostenko S.А.

The Effect of Steel Fiber on the Road Performence of Asphalt Concrete

2014 ◽  
Vol 584-586 ◽  
pp. 1342-1345 ◽  
Author(s):  
Jie Fei Guo
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Asphalt Concrete ◽  
Steel Fiber ◽  
Heavy Traffic ◽  
Reference Value ◽  
Bending Test ◽  
The Road ◽  
Splitting Test ◽  
On The Road

In order to solve the problems relevant to asphalt concrete,such as cracking in low temperature, bleeding in high temperature and water damage,this paper put forward the ideal incorporation of steel fiber with asphalt concrete to reinforce the pavement performance and service life.By analyzing the test results such as rutting test, low temperature bending test,freeze-thaw splitting test and comparing with the stability in high temperature, anti-cracking performance in low temperature and the water stability between steel fiber asphalt concrete and the ordinary asphalt concrete,we can conclude that adding steel fiber with asphalt concrete can significantly improve the performance of road.This paper has reference value for choosing asphalt pavement in areas of low temperature and heavy traffic.

Study on the Effect of Warm Mix Modifiers on the Performance of Guss Asphalt

2014 ◽  
Vol 488-489 ◽  
pp. 554-557
Author(s):  
Xing Song Cao ◽  
Dong Wei Cao ◽  
Yi Fei Wu ◽  
Xio Qiang Yang ◽  
Shi Xiong Liu
Keyword(s):  
Low Temperature ◽  
Bending Test ◽  
Test Results ◽  
Low Carbon ◽  
The Road ◽  
Road Performance ◽  
On The Road ◽  
Track Test ◽  
Better Than ◽  
Low Carbon Emission

In order to comparatively study the effect of warm mix modifiers on the road performance of guss asphalt, the guss asphalt mixtures, whose asphalt aggregate ratio were 8.5%,9.0%,9.5% respectively, were mixed with 0%,1%,2%,3% of the RH and Sasobit warm mix modifiers. Then by means of Lueer test, penetration test, wheel track test and low-temperature bending test, the performance of guss asphalt were evaluated. The test results show that: RH and Sasobit can effectively improve the workability of guss asphalt; RH is better than Sasobit in reducing viscosity of guss asphalt; RH reduces the high-temperature properties of guss asphalt; On the contrary, Sasobit can improve the hightemperature performance of guss asphalt; RH and Sasobit have an adverse impact on the crack resistance of guss asphalt in low temperature, so their content should not too high. Guss asphalt has characteristics of high construction temperature and energy consumption. In order to reduce construction temperature, based on energy conservation, low-carbon emission environment, reduce the aging of asphalt principle, warm modifiers could be used to reduce the viscosity of guss asphalt at high temperatures[1-5]. Sasobit modifiers imported from Germany are used much more to improve the workability of guss asphalt. In this paper, 0%, 1%, 2%, 3% RH and Sasobit warm mix modifier were mixed with the aggregate ratio of 8.5%, 9.0%, and 9.5% of the Guss asphalt to compare and analyzed the performance of those two warm modifiers on Guss asphalt.

scholarly journals On the road to low temperature district heating

2019 ◽  
Vol 1398 ◽  
pp. 012002 ◽  
Author(s):  
Adam Cenian ◽  
Mieczysław Dzierzgowski ◽  
Bartosz Pietrzykowski
Keyword(s):  
Low Temperature ◽  
District Heating ◽  
The Road ◽  
On The Road
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