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Method for Determining Optimum Asphalt Consumption of Large Particle Size Asphalt Mixture

A technology of optimal asphalt dosage and asphalt mixture, applied in the field of asphalt testing, can solve problems such as not having optimal asphalt

Inactive Publication Date: 2016-10-26
SHENYANG JIANZHU UNIVERSITY
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Problems solved by technology

[0006] In view of the fact that the Marshall test is used as the design method of asphalt mixture in the current specification of our country and the determination of the void ratio is not accurate, the conditions for determining the optimal amount of asphalt are not available only by the void ratio. Therefore, the comprehensive asphalt mixture High, low temperature and water stability performance, focusing on local successful experience, and put forward a method for determining the optimal asphalt dosage of large particle size asphalt mixture

Method used

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Embodiment Construction

[0013] According to the type of asphalt mixture, combined with local engineering practice experience, the initial asphalt amount P b0 . Taking it as the median value and changing at an interval of ±0.3%, five groups of asphalt dosages are initially selected, and two groups of rut test specimens are made respectively. One group of test specimens is not soaked in water, and the other group of test specimens is soaked in normal temperature water for 2 hours. Put it into a plastic bag, add 200mL of water, freeze the specimen at -18°C for 16 hours, and immediately put it in water at 60°C for 24 hours. Both groups of specimens are kept at 25°C for 2 hours, and then carry out the rutting test to determine the dynamic stability DS and the dynamic stability ratio DSR, draw the relationship curves between the amount of asphalt and DS and DSR respectively, and determine the optimal amount of asphalt P b1 ,P b2 ; For the densely graded asphalt mixture, the bending test and the freeze-th...

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Abstract

The invention discloses a method for determining the optimum asphalt dosage of a large particle size asphalt mixture, which is realized by the following method: firstly, the initial asphalt dosage is estimated ; Take it as the median value, and change at an interval of ±0.3%, (a) Carry out rutting test and freeze-thaw cycle rutting test to determine the optimal amount of asphalt , ;(b) Conduct low-temperature bending test and freeze-thaw cycle bending test to determine the optimal amount of asphalt , ; (c) take , , , The arithmetic mean value of the four is used as the optimum asphalt dosage . When failure strain cannot be accurately determined

Description

technical field [0001] The invention relates to the technical field of asphalt testing, in particular to a method for determining the optimum asphalt dosage of a large particle size asphalt mixture. Background technique [0002] my country's current "Technical Specifications for Highway Asphalt Pavement Construction" (JTG F40-2004) uses the Marshall test method to determine the optimal asphalt dosage for asphalt mixtures. This method uses the traditional Marshall compaction test method to form test pieces. The existing problems are as follows: [0003] 1) There are differences between the test piece forming and the actual construction process. Because the Marshall compaction instrument relies on the compaction to form the test piece, it cannot truly reflect the kneading and rolling effect of the road roller and the vehicle load on the asphalt pavement, which is quite different from the action of the asphalt pavement under construction and use, and the Marshall test piece Co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B26/26
Inventor 孙兆辉王思蒙陈钢王铁滨
Owner SHENYANG JIANZHU UNIVERSITY
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