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Method for designing and evaluating dense-grading large stone asphalt mixture

A technology of asphalt mixture and evaluation method, which is applied in the field of highway engineering construction and maintenance, to achieve the effect of enhancing road performance and facilitating promotion

Inactive Publication Date: 2012-04-18
SHANXI PROVINCIAL RES INST OF COMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a design and evaluation method for densely graded large particle size asphalt mixture, which can solve the problems of anti-rutting and anti-fatigue applicable to heavy traffic pavement, and prolong the service life of the pavement

Method used

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  • Method for designing and evaluating dense-grading large stone asphalt mixture
  • Method for designing and evaluating dense-grading large stone asphalt mixture
  • Method for designing and evaluating dense-grading large stone asphalt mixture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] LSAM is used in the pavement of asphalt pavement. A certain expressway is designed as a two-way four-lane expressway, which is an expressway in mountainous areas. The extreme maximum temperature in the past 20 years is 39.8°C, and the extreme minimum temperature is -19.5°C. The design cumulative number of axle loads = 2.680×10 6 Time / per lane, the proportion of large trucks in the traffic composition accounts for 40% to 50%, and it is expected to often encounter slow traffic conditions. The LSAM coarse type is used as the middle layer to strengthen the high temperature resistance to permanent deformation and load fatigue resistance. According to the traffic The base asphalt of PG 58-22 is selected for volume, driving speed and air temperature, and the design thickness is 10cm. The designed LSAM parameters are as follows:

[0024] LSAM mix design results

[0025]

[0026] Synthetic grading test parameter values

[0027]

[0028] Performance Analysis of Asph...

Embodiment 2

[0033] LSAM is used in the pavement of asphalt pavement. The pavement renovation of an expressway is designed as a two-way four-lane expressway, which is an expressway in a mountainous area, with an average slope of more than 4%, an extreme maximum temperature of 43°C, and an extreme minimum temperature of -25.8°C. Design accumulative number of axle loads 5.66×10 8 Time / per lane, the proportion of large trucks in the traffic composition accounts for about 45%, and it is expected to often encounter slow traffic conditions. The LSAM thin layer is used as the middle layer to strengthen the high temperature resistance to permanent deformation and load fatigue resistance. According to traffic volume, PG 70-22 modified asphalt is selected for driving speed and air temperature, and the design thickness is 8cm. The designed LSAM parameters are as follows:

[0034] LSAM mix design results

[0035]

[0036] Synthetic grading test parameter values

[0037]

[0038] Perform...

Embodiment 3

[0043] LSAM is used in the pavement of asphalt pavement. The pavement of a certain expressway is designed as a two-way four-lane highway, which is a plain area expressway, with an extreme maximum temperature of 37.6°C and an extreme minimum temperature of -28.6°C. The design accumulative number of axle loads is 5.77×10 7 Time / per lane, the proportion of large trucks in the traffic composition accounts for about 40%, and it is expected to often encounter slow traffic conditions. The LSAM thin layer is used as the lower layer to strengthen the high temperature resistance to permanent deformation and load fatigue resistance. According to traffic volume, The driving speed and air temperature select PG 64-22 base asphalt, the design thickness is 8cm, and the designed LSAM parameters are as follows:

[0044] LSAM mix design results

[0045]

[0046] Synthetic grading test parameter values

[0047]

[0048] Performance Analysis of Asphalt Mixture Pavement

[0049]

...

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Abstract

The invention relates to a method for designing and evaluating a dense-grading large stone asphalt mixture. In the method for designing and evaluating the performance of an LSAM (large stone asphalt mixture) structure, a key point for forming a squeezed compact structure is arranged according to the squeezing and filling characteristics of aggregate grading, and new volume design and separation-resistant design control indexes of a [CA'] ratio, a [FAc'] ratio and an [FAf'] ratio are proposed, and the optimal asphalt use amount is determined by combining with a Superpave level 1 volume design method. Mechanical design indexes CEI (Compaction Energy Index) and TDI (Traffic Densification Index) are introduced into to evaluate structural resistance, a dynamic modulus and a main curve thereof are introduced in to evaluate the high-temperature permanent deformation resistance performance of the LSAM, a low-temperature bending strain energy density is introduced in to evaluate the low-temperature crack resistance of the LSAM, and a site coring is introduced for a hamburg wheel tracking test to check the pavement performance of the LSAM after paving. According to the method, the problem of resisting tracks and fatigue for extra-heavy asphalt pavements can be solved, and the service life of the pavement is prolonged.

Description

technical field [0001] The invention belongs to the technical field of highway engineering construction and maintenance, and in particular relates to a method for designing and evaluating a densely graded large particle size asphalt mixture. Background technique [0002] Most of the expressways built in my country at this stage have early rutting and cracking diseases. This is certainly due to the rapid increase in traffic volume and axle load brought about by rapid economic growth, but it also reflects that the asphalt pavement design and construction of my country's expressways The general lack of strength of asphalt mixture. [0003] Compared with the currently commonly used asphalt mixture, the large particle size asphalt mixture LSAM forms more stone-stone contact structures, which has greater friction and embedding force, and can effectively reduce the impact of asphalt when used as the middle layer of the pavement structure. Road rutting, load fatigue damage, temper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B26/26
Inventor 刘少文李文良樊英华张晓燕王志强杨玉东孔繁盛冯银富
Owner SHANXI PROVINCIAL RES INST OF COMM
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