Techniques to mitigate reflective cracking in asphalt overlay

2008 ◽  
Author(s):  
W Shitangkoon ◽  
H Wen
Keyword(s):  
Reflective Cracking ◽  
Asphalt Overlay

Study on the Main Characteristics of Reflective Cracking in the Asphalt Overlay on an Old Cement Pavement

2020 ◽  
Vol 980 ◽  
pp. 244-253
Author(s):  
Chun Fu Zhu ◽  
Pei Feng Cheng ◽  
Guang Yu Zhao
Keyword(s):  
Working Conditions ◽  
Coupling Effect ◽  
Shear Crack ◽  
Effect Of Temperature ◽  
Reflective Cracking ◽  
Effective Prevention ◽  
Finite Element Software ◽  
Asphalt Overlay ◽  
Prevention And Treatment ◽  
Reflection Crack

The purpose of this study is to explore the forms and characteristics of reflection crack in asphalt overlay of old cement pavement, so as to provide reference for effective prevention and treatment of reflection crack.By means of ANSYS finite element software, considering the coupling effect of temperature and vehicle in different working conditions, the influence of cooling on asphalt overlay was analyzed, and the location and form of crack were discussed.The analysis results show that tensile crack and shear crack are more likely to occur near the joint of old cement pavement, and shear crack is more likely to occur in areas outside the joint, about 1/2 wheel length from the joint of cement pavement.The prevention and treatment of crack at different locations should be carried out according to different working conditions.

Life-Cycle Cost Analysis of Mitigating Reflective Cracking

2003 ◽  
Vol 1823 (1) ◽  
pp. 73-79 ◽  
Author(s):  
Susan Tighe ◽  
Ralph Haas ◽  
Joseph Ponniah
Keyword(s):  
Service Life ◽  
Life Cycle Cost ◽  
Cost Savings ◽  
Economic Benefits ◽  
Crack Spacing ◽  
Reflective Cracking ◽  
International Roughness Index ◽  
Pavement Rehabilitation ◽  
Asphalt Overlay ◽  
Benefit Cost

Reflective cracking is a major and costly problem in many countries. It occurs in the top (overlay) layers above existing cracks in the lower (existing) pavement. This type of cracking can lead to premature deterioration of the pavement structure through the infiltration of moisture and debris. Although extensive research has been directed toward mitigation of the problem, work needs to be done, as it still appears to be a major problem. The problem is related in part to the fact that most of the work being done involves rehabilitation. One of the most common types of pavement rehabilitation is the use of an asphalt overlay. The focus of the present analysis is the economic benefits of reducing and treating reflective cracking before the placement of an asphalt overlay. A methodology for converting crack spacing to roughness is also presented. This information is used to examine how cracking is related to the measured international roughness index values. A model relating the amount of cracking to the loss of serviceability or a reduction in service life is presented. That model indicates that a reduction of transverse crack spacing from 5 to 20 m should result in a 5-year extension of service life, with a cost savings of $25,000 (2002 U.S. dollars) per two-lane kilometer. Measurement and treatment of cracking can also yield significant benefits. Benefit–cost ratios from the measurement of cracking can range from about 5 to 50, while proper and timely crack treatment (routing and sealing) can result in an extension of pavement life by 2 years and cost savings of $7,000 per lane kilometer.

Highly Modified Asphalt Binder for Asphalt Crack Relief Mix

2017 ◽  
Vol 2630 (1) ◽  
pp. 110-117 ◽  
Author(s):  
Matheus S. Gaspar ◽  
Kamilla L. Vasconcelos ◽  
Amanda H. M. da Silva ◽  
Liedi L. B. Bernucci
Keyword(s):  
Hot Mix Asphalt ◽  
Asphalt Binder ◽  
Asphalt Mixture ◽  
Bending Test ◽  
Asphalt Binders ◽  
Reflective Cracking ◽  
Modified Asphalt ◽  
Asphalt Overlay ◽  
Modified Asphalt Binder ◽  
Styrene Butadiene

Reflective cracking is a common issue with respect to rehabilitated asphalt pavements, especially when the rehabilitation is done by applying a hot-mix asphalt overlay on the existing damaged pavement. Several approaches can be adopted to delay reflective cracking. They include an increase of the overlay thickness and the use of a stress relief asphalt mixture (SRAM), which is a fine-graded, flexible, and thin asphalt interlayer. Because the efficiency of a SRAM is highly related to the properties of the asphalt binder used in the mixture, it is of interest to use a highly modified asphalt (HiMA) binder. This paper describes a field test comprising three sections at BR-116 (a heavily trafficked highway in Brazil). One of the rehabilitation strategies used for a cracked asphalt pavement was a 2.5-cm SRAM (produced with a HiMA binder) and 5-cm styrene–butadiene–styrene (SBS) hot-mix asphalt (HMA). The other two strategies were to apply SBS HMA overlays of different thicknesses (7.5 cm and 10.5 cm). The aim was to evaluate and compare the capability of these solutions to control reflective cracking. Rheological properties and multiple stress creep and recovery tests were performed on the asphalt binders, and the semicircular bending test was performed on the asphalt mixtures. The surface conditions were monitored, and the results for each section were compared. After a 29-month period, the section that received the interlayer had the lowest cracked area and showed better resistance than the overlays did to reflective cracking and better maintenance of the original thickness of the pavement.

Dynamic Response Analysis of Stress Intensity Factors of Reflective Cracking in Asphalt Overlay Suffer Wheel Load

2011 ◽  
Vol 217-218 ◽  
pp. 187-190
Author(s):  
Bin Yang ◽  
Qin Shou Huang ◽  
Xin Wang Qiu ◽  
Hua Xu
Keyword(s):  
Stress Intensity ◽  
Stress Intensity Factors ◽  
Dynamic Loads ◽  
Response Analysis ◽  
Reflective Cracking ◽  
Intensity Factors ◽  
Wheel Load ◽  
Asphalt Overlay ◽  
Wheel Loading ◽  
Asphalt Overlays

Partial wheel loading of the existing old cement concrete pavement joint will easily causes shear-type reflective cracking of asphalt overlay, which will cut down the service life of the pavement. This paper conducts an research on the changing rules of stress intensity factors of reflective cracking in asphalt overlay suffer dynamic loads. Choose 3 asphalt overlays with typical reflective cracking extend length of 1cm, 4cm and 8cm to investigate the impacts of parametric variation of vehicle speed, asphalt overlays thickness and modulus and stress absorbing layer on stress intensity factors of reflective cracking in asphalt overlays suffer singe-wheel dynamic loads. Results show that time history curves of dynamic stress intensity factors declines with the increase of structure-layer parameters; the maximum amplitude decreases as time goes on; the larger the structure parameter is, the faster the degradation is; and the vibration levels to gentle in the later half period, but stress intensity factors are not equal to zero in the last period of vibration, which shows that there exists residual stress intensity factors.

Analysis of Temperature Variation and Thermally-Induced Reflective Cracking Potential in Composite Pavements

2020 ◽  
Vol 2674 (10) ◽  
pp. 177-188
Author(s):  
Pengyu Xie ◽  
Hao Wang
Keyword(s):  
Temperature Profile ◽  
Temperature Variation ◽  
Transfer Model ◽  
Climate Data ◽  
Reflective Cracking ◽  
Thermally Induced ◽  
Initiation Phase ◽  
Asphalt Overlay ◽  
Cracking Potential ◽  
Composite Pavements

Reflective cracking is the major distress in composite pavement and can accelerate the deterioration of the whole structure. This paper analyzes the potential for reflective cracking in composite pavements because of thermal cycles. A heat transfer model was first developed to predict cyclic temperature variations with climatic inputs (solar radiation, wind velocity, air temperature, and humidity). Mechanical models were then employed to analyze thermally-induced reflective cracking potential using fracture mechanics parameters. Both models were validated through field measurement of temperature profile and crack propagation. The temperature profile in composite pavement can be predicted accurately from climate data and typical thermal material properties. Because of the temperature variation and gradient in composite pavement, concrete slabs undergo joint opening and curling deformation and stress concentration occurs at the bottom of the overlay. The loading cycles for initiation and propagation of reflective cracking were predicted by empirical equation and Paris’ law. Increasing overlay thickness can extend the pavement service life, but care is needed as different thicknesses offer varying efficiency. Thicker asphalt overlay mitigates reflective crack potential, especially at the crack initiation phase.

Study on Design Method for Asphalt Overlay on Old Cement Concrete Pavement in Shanxi Province on Trunk Highway

2014 ◽  
Vol 556-562 ◽  
pp. 977-983 ◽  
Author(s):  
Hui Wang ◽  
Jiu Peng Zhang
Keyword(s):  
Mechanical Response ◽  
Design Method ◽  
Concrete Pavement ◽  
Shanxi Province ◽  
Reflective Cracking ◽  
Cement Concrete ◽  
Heavy Load ◽  
Improvement Project ◽  
Asphalt Overlay ◽  
Cement Concrete Pavement

In view of the the imperfection of design method of asphalt overlay on old cement under heavy-load traffic, and with the background of a successful practice of repaving improvement project in Xia Jiaying-Fen Yang expressway, this article analyzes the mechanical response of the old cement concrete road slab and the overlay, takes the influence of the void under slab on the life expectancy of asphalt overlay into account, and advances the mechanistic-empirical design process of asphalt overlay under heavy-load traffic. In comparison with Chinese standard, this method takes the influence of old concrete pavement on the reflective cracking of overlay into consideration, which ensures that there is no reflective cracking on the overlay in 3 years.

scholarly journals Influence of bitumen type on cracking resistance of asphalt mixtures used in pavement overlays

2018 ◽  
Vol 2018 (11) ◽  
pp. 49-59
Author(s):  
Piotr Jaskula ◽  
Cezary Szydlowski ◽  
Marcin Stienss
Keyword(s):  
Asphalt Mixture ◽  
Asphalt Mixtures ◽  
Test Method ◽  
Reflective Cracking ◽  
Cracking Resistance ◽  
Asphalt Overlay ◽  
Superpave Gyratory Compactor ◽  
Mineral Mixture ◽  
Propagation Properties ◽  
Selection Of

Cracking is one of the predominant distresses occurring in flexible pavements, especially in old pavements that were rehabilitated with an asphalt overlay. In such cases asphalt mixtures should be designed to ensure high resistance to reflective cracking because new asphalt layers are exposed to existing cracks of the old pavement. The nature of these cracks can be various (transverse, longitudinal as well as crazy cracking). One factor that minimizes this type of distress is the proper mix design process, which should involve selection of specific bitumen binder and mineral mix gradation. However, still there is no universally adopted laboratory test method that would allow to clearly assess resistance of asphalt mixtures to reflective cracking. This paper describes the usage of one of the devices developed to test asphalt mixtures in terms of such distress – Texas Overlay Tester. For this test, samples prepared in laboratory conditions (i.e. compacted with the use of Superpave Gyratory Compactor) as well as obtained in the field (by core drilling) can be used. The results are obtained not only quickly and easily, but also with sufficient repeatability. The described method characterizes both crack initiation and crack propagation properties of asphalt mixtures. In this work one type of mineral mixture was tested with 4 different types of bitumen (one neat bitumen, two ordinary polymer-modified and one polymer-modified with high polymer content). For selected cases extra additives (rubber and loose fibres) were also tested. In total, six asphalt mixtures were tested. A ranking of the used binders was created on the basis of the results in order to conclude which bitumen would ensure the best performance characteristics in terms of reflective cracking. The results have clearly shown that deliberate choice of the binder used in the asphalt mixture for the overlay will significantly improve its reflective cracking resistance or even fatigue resistance.

Analysis of the Mode of Crushing and Stability in Old Cement Pavement during Asphalt Overlay Project

2012 ◽  
Vol 204-208 ◽  
pp. 1941-1944 ◽  
Author(s):  
Hua Wang ◽  
Yun Feng Wu ◽  
Song Ye
Keyword(s):  
Concrete Slab ◽  
Relative Displacement ◽  
Concrete Pavement ◽  
Construction Technology ◽  
Reflective Cracking ◽  
Cement Concrete ◽  
Asphalt Overlay ◽  
Cement Concrete Pavement ◽  
Pressure Impact

In the process of old cement concrete pavement is transformed, asphalt overlay is the common method. However, due to the cracks of the original cement concrete slab when load and temperature and humidity changes will produce a relative displacement, it can not avoid reflective cracking. So in order to prevent the reflective cracking of asphalt overlay, crush the old cement concrete pavement is the important manner. Different construction technology is divided into three kinds: cracked steady pressure, impact compaction and rubblization technology. Among these, rubblization is an important technology that utilizes in-situ crushing technique in cement concrete pavement. This article discusses the characteristics of these three techniques, and it also evaluates effectiveness.

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