A design method of ac-20 modified asphalt mixture based on road performance
A technology of asphalt mixture and road performance, which is applied in the direction of instruments, ratio control, control/regulation systems, etc., can solve problems such as rutting disease, poor road surface performance, and the test piece forming method cannot simulate driving compaction, etc., to achieve saving the effect of time
Active Publication Date: 2019-11-19
SHENYANG JIANZHU UNIVERSITY
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Problems solved by technology
However, after many years of engineering practice, people have gradually realized that there are many shortcomings in the Marshall test method, such as the difference between the test piece forming and the actual construction process, the test piece forming method cannot simulate the driving compaction, and cannot reflect, optimize and predict the road surface. Usability, etc. Although all the indicators of the Marshall test meet the requirements of the specification, the pavement has poor performance and serious rutting and other diseases
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Embodiment 1
[0042] In this embodiment, the AC-20 modified asphalt mixture design method based on road performance specifically includes the following steps:
[0043] 1. Select the fractal dimension
[0044] As shown in Table 1, the fractal dimensions D, D of the proposed AC-20 modified asphalt mixture gradation C and D f The range of is a comprehensive range derived on the premise of satisfying the road performance, and it is recommended to select the value within the range of fractal dimension.
[0045] Table 1 The fractal dimension range of AC-20 modified asphalt mixture meeting road performance requirements
[0046] skills requirement D D c
D f
High temperature stability / 60℃ 2.4535～2.5835 2.3988～2.6229 2.3127～2.5468 Low temperature crack resistance / -10℃ 2.3388～2.5835 2.3048～2.5171 2.3734～2.5870 water stability 2.4171～2.5993 2.4080～2.6102 2.3420～2.5669 Comprehensive performance 2.4535～2.5835 2.4080～2.5171 2.3734～2.5468
[0047] 2....
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The invention belongs to the technical field of road engineering, and especially relates to a design method of an AC-20 modified asphalt mixture based on a pavement performance. According to the climate, traffic, and material characteristics of northeast area of China, a large amount of road performance tests is carried out and a fractal theory is used to establish an asphalt mixture road performance prediction model and a grading examination and prediction model. According to the requirements of current specification, the range of grading fractal dimension of an asphalt mixture aggregate thatsatisfies the road performance requirements of an asphalt pavement in the northeast area, the range of a coarse aggregate, and the range of a fine aggregate are provided. In the provided ranges, corresponding fractal dimensions are selected as the design parameters. Based on the fractal dimensions, the mineral substance passing rate of sieve pores is obtained. Through the established road performance prediction model, the asphalt mixture pavement performance is examined. The grading examination and prediction model is used to examine the grading framework. Finally, the asphalt mixture that satisfies the predicted performance requirements is tested and verified to obtain the good grading that satisfies the performance requirements.
Description
technical field [0001] The invention belongs to the technical field of road engineering, in particular to an AC-20 modified asphalt mixture design method based on road performance. Background technique [0002] For a long time, the mix design method of asphalt mixture has been the research focus of road researchers and builders. At present, most countries in the world adopt the Marshall method to design asphalt mixture, and my country is no exception. However, after many years of engineering practice, people have gradually realized that there are many shortcomings in the Marshall test method, such as the difference between the test piece forming and the actual construction process, the test piece forming method cannot simulate the driving compaction, and cannot reflect, optimize and predict the road surface. Performance, etc. Although all the indicators of the Marshall test meet the requirements of the specification, the road performance is poor and the rutting and other di...
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IPC IPC(8): C04B26/26G05D11/00
Inventor 孙兆辉王思蒙王铁滨贾连光陈瑞三朱广强
Owner SHENYANG JIANZHU UNIVERSITY