Mechanical Response Analysis of Heavy Traffic on Semi-Rigid Base Pavement Performance
TL;DR: In this paper, the authors analyzed the stress distribution of asphalt pavement structure under heavy traffic theoretically, according to the main asphalt pavement form in our country, by using elastic layer theory and BISAR3.0 program, analyzed the mechanical response variation of semi-rigid base asphalt pavement under different axle loads.
Abstract: Viewing so many overload vehicles, this paper analyzes the stress distribution of asphalt pavement structure under heavy traffic theoretically, according to the main asphalt pavement structure form in our country. By using elastic layer theory and BISAR3.0 program, analyzed the mechanical response variation of semi-rigid base asphalt pavement under different axle loads. The results showed that the mechanical response and the stress indexes of pavement structure under heavy traffic changed significantly. Therefore, in asphalt pavement design, the impact of heavy traffic should be fully considered and we must take measures to control the overload situation.
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TL;DR: In this paper, the authors investigated the technical performances of Solution Road RomixSoilfix (SRX)- stabilized graded macadam (SSGM) to promote its application and proposed specimen curing conditions to improve the test efficiency by analyzing the influence of curing temperature on the unconfined compressive strength and moisture content variation.
Abstract: The technical performances of Solution Road RomixSoilfix- (SRX-) stabilized graded macadam (SSGM) are investigated to promote its application. The specimen curing conditions were proposed to improve the test efficiency by analyzing the influence of curing temperature on the unconfined compressive strength and moisture content variation. Moreover, the mechanical properties (e.g., CBR, strength, and resilient modulus) and pavement performances (e.g., temperature shrinkage, water stability, and freezing stability) of SSGM were evaluated through laboratory tests. The results show that the recommended curing temperature in the drying oven should be 100°C ± 2°C and the recommended curing time should not be less than 16 h. Furthermore, the CBR, unconfined compressive and splitting strengths, and resilient modulus of SSGM increase with the content of SRX stabilizer. The temperature shrinkage coefficient is approximately 15% of the cement-stabilized grading crushed stone. The dry-wet recovery strength ratio is approximately 96% after four dry-wet cycles. The freeze-thaw recovery strength ratio is approximately 58% after five freeze-thaw cycles. The freezing stability of SSGM can be improved by increasing the content of SRX stabilizer. The technical performances of SSGM should fulfill the technical requirements.
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References
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01 Jan 1997
TL;DR: In this paper, a series of international conferences has facilitated the development of mechanistic methods for the design and structural evaluation of asphalt pavements over the past 35 years and the major achievements are outlined and the latest developments discussed, including more realistic theoretical modelling and the availability of higher quality data from modern testing facilities both in the laboratory and in the field.
Abstract: This series of international conferences has facilitated the development of mechanistic methods for the design and structural evaluation of asphalt pavements over the past 35 years. While the record is one of real achievement, stimulated by initiatives such as the U.S. Strategic Highway Research Program, there are still problems to solve and challenges to face including that of implementing the results of research. The major achievements are outlined and the latest developments discussed. These include more realistic theoretical modelling and the availability of higher quality data from modern testing facilities both in the laboratory and in the field. The need to incorporate the principles of soil mechanics more effectively in the design and evaluation of pavement foundations is identified. The continued extensive use of the CBR concept is questioned and the need for application of more relevant parameters is encouraged. Several other procedures which have long been used are critically reviewed and attention is drawn to innovative ideas including new concepts for modelling asphaltic materials. The theme of "Paving-the-Gap" between research and practice is considered and examples given of success. The importance of structural evaluation is emphasised and the need to develop faster, more convenient data gathering facilities is considered. The concept of "Smart Roads" incorporating appropriate low cost instrumentation could help in this context.
39 citations
Journal Article•
TL;DR: In this paper, the effects of load, tire pressure, and tire type on the response of an asphalt concrete pavement were measured using surface deflection, surface strain, and strain at the bottom of the asphalt layer.
Abstract: The results are summarized of a study which measured the effects of load, tire pressure, and tire type on the response of an asphalt concrete pavement. Measurements were made of surface deflection, surface strain, and strain at the bottom of the asphalt layer. Fatigue equivalency factors were developed using an exponential relationship between the number of cycles to failure and the magnitude of the tensile strain at the asphalt layer's bottom. The study found that each of the responses was affected more by load than by tire pressure. Correspondingly, the equivalency factors, too, are more influenced by load. A summary is presented of the research approach, test results, analyses, and major findings and conclusions.
15 citations
01 Jan 1997
TL;DR: In this paper, a comparison of fatigue criteria which are used in mechanistic methods of pavement design is presented, and the fatigue formulas for all the considered criteria were given and fatigue curves were compared.
Abstract: The paper presents comparison of fatigue criteria which are used in mechanistic methods of pavement design. The following criteria were considered: (a) for fatigue cracking of asphalt layers and structural rutting (subgrade strain): LCPC and SETRA (France), Nottingham University (United Kingdom), Road Research Centre in Belgium, Shell and The Asphalt Institute (USA) and (b) for fatigue cracking of bases treated with hydraulic binders: CSIR (South Africa), Road Research Centre in Belgium, University of Illinois (USA). The aim of the comparison was to select suitable fatigue criteria for the revision of the 20-year-old Polish catalogue of typical pavements which was required due to significant increase in traffic volume and in axle loads. In the paper the fatigue formulas for all the considered criteria were given and fatigue curves were compared. Pavement structures with different base courses were designed for a range of traffic volumes with regard to various fatigue criteria and Polish design considerations. The designed structures were compared with pavement structures included in the old Polish catalogue of typical pavements which performance can be evaluated as acceptable. On this basis the following criteria were selected as suitable for Polish conditions: (a) for fatigue cracking of asphalt layers and structural rutting (subgrade strain) - The Asphalt Institute (USA), and (b) for fatigue cracking of cement treated bases - CSIR (South Africa), Road Research Centre in Belgium, University of Illinois (USA). New typical pavements structures were designed according to the selected fatigue criteria.
10 citations
"Mechanical Response Analysis of Hea..." refers background in this paper
...008P+152) ±70 (1) Where A is tire contact area, cm 2 , and P is the load of each tire, N, and ±70, ±90 are to ensure that 95% of the deviation range....
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...From the analysis of asphalt pavement mechanical response under different axle loads, we can draw the following conclusions: (1)With the increasing of axle load, the road surface deflection increased linearly, and the maximum value occurred on the center of the contact surface....
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Journal Article•
TL;DR: In this article, the authors present the changing rules and influencing factors of mechanical responds of the semi-rigid base course asphalt pavement structure under heavy axle load, and show that heavy axle loads have remarkable influences on the asphalt pavement stress value.
Abstract: There are many reasons which causes serious initial failures of asphalt pavement.The mechanical responds of asphalt pavement under heavy traffic in traditional design methods have not been considered sufficiently.So this paper analysed the mechanical responds of the road structure under heavy-load.Using the multilayered elastic system theory,under the style of double rounds uniform load,considering the change of axle load,this paper present the changing rules and influencing factors of mechanical responds of the semi-rigid base course asphalt pavement structure.The results indicated that heavy axle load has remarkable influences to the asphalt pavement stress value.As a result,the influence of heavy traffic should be fully considered and controlled in the design process.
1 citations