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Designing and evaluating method for modulus-based bituminous mixture

A technology of asphalt mixture and mixture, which is applied in the field of design and evaluation of asphalt mixture, asphalt pavement, and asphalt mixture, and can solve the problems of design time and cost

Active Publication Date: 2018-06-12
嘉兴市嘉海建设有限公司 +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

When the pavement performance of the mixture cannot meet the requirements, it is necessary to readjust the asphalt dosage or gradation, and the readjustment will consume a lot of design time and cost

Method used

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  • Designing and evaluating method for modulus-based bituminous mixture
  • Designing and evaluating method for modulus-based bituminous mixture
  • Designing and evaluating method for modulus-based bituminous mixture

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Embodiment Construction

[0027] A modulus-based design and evaluation method of asphalt mixture, which is characterized by the following steps:

[0028] 1) Investigate or test the performance of local aggregates and asphalt, including aggregate gradation, density, elastic modulus, and dynamic shear modulus of asphalt;

[0029] 2) Grading design, based on local aggregate grading and specifications, suggest grading preliminary selection;

[0030] 3) Predict the VMA value of the mixture by using the VMA prediction formula of the asphalt mixture mineral clearance ratio, and adjust the gradation to make the VMA value meet the specification requirements;

[0031] VMA prediction uses the following formula:

[0032]

[0033] Where: VMA is the predicted value of mineral clearance ratio; f vi Is the influencing factor of mineral clearance rate; V ai Is the sieve volume of the i-th aggregate;

[0034] f vi =[V vi -V v(i-1) ] / V ai

[0035] Where: V vi Is the volume of the pores in the i-th grade aggregate after mixing; V ...

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Abstract

The invention discloses a designing and evaluating method for a modulus-based bituminous mixture. The designing and evaluating method for the modulus-based bituminous mixture comprises the following steps: surveying or detecting performance of local aggregates and asphalt; primarily selecting grading according to local aggregate grading and standard suggested grading; predicting a VMA value of themixture by a bituminous mixture mineral aggregate clearance rate VMA predicting formula, and preliminarily adjusting grading to enable the VMA value to meet the standard requirement; primarily selecting the use amount of asphalt and calculating the effective asphalt use amount VFA of the mixture; calculating the dynamic modulus of the bituminous mixture; comparing whether a dynamic modulus predicted value is in a bituminous mixture dynamic modulus range in which the performance of the mixture is acceptable; and manufacturing a test piece according to the matching ratio of the bituminous mixture of which the dynamic modulus meets requirements, and verifying whether the pavement performance of the mixture meets the requirements or not.

Description

Technical field [0001] The invention relates to the field of road engineering, and relates to asphalt pavements and asphalt mixtures, in particular to asphalt mixture design and evaluation methods. Background technique [0002] Asphalt mixture is currently the most commonly used pavement material in my country. The dynamic modulus is an important mechanical index and road performance (rutting resistance, fatigue resistance) index of asphalt mixture. It can directly reflect the mechanical properties of the asphalt mixture in actual use, and it also has a strong correlation with the road performance of the mixture. These properties are directly related to the quality of the road surface and the service life of the road surface in the project, and the dynamic modulus itself is an important parameter in the design of the pavement structure. [0003] At present, the design of asphalt mixture in my country mainly adopts the Marshall design method. The design process of this method can...

Claims

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Application Information

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IPC IPC(8): C04B26/26
CPCC04B26/26C04B2111/00198C04B2111/0075G16Z99/00C04B18/12
Inventor 沈士蕙张程偶立军朱伟峰
Owner 嘉兴市嘉海建设有限公司
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