A test method and application of equivalent compaction work of asphalt mixture
A technology for asphalt mixture and detection method, which is applied in the preparation of test samples, measuring devices, analyzing materials, etc. Mixing efficiency and construction progress, accurate compaction degree, energy saving effect
Inactive Publication Date: 2019-03-08
黑龙江省交通运输信息和规划研究中心
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Problems solved by technology
With the improvement of the level of construction technology and compaction machinery (vibratory rollers are generally 10-14t, rubber-tyred rollers 25t-30t), practice has proved that the compaction work of these compaction machinery increases, making the final density of asphalt mixture on the road Exceeded the standard Marshall method established at the beginning, so the asphalt mixture test method (Marshall test method) used in the current specification cannot simulate the compaction effect on site, resulting in the design parameters obtained according to the test method of equivalent compaction work. The significance of construction is not great, that is, the compaction work on site does not match the compaction work of indoor Marshall. When the Marshall density is used to control the on-site compaction degree, most of the compaction degrees are over 100, and the actual on-site compaction degree cannot be obtained.
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Embodiment 1
[0039] 1. Determine the optimal amount of asphalt according to the design steps of the standard mix ratio
[0040] Firstly, the asphalt mixture design test is carried out. The dense gradation is selected as the structural target for the mixture gradation. The asphalt is selected from Bafang Industrial SBS modified asphalt. Jilin pear tree mineral powder. Marshall used 75 times of compaction work on both sides to determine the optimal asphalt dosage, calculated the indoor Marshall's gross volume relative density, and obtained the standard density achieved under the optimal asphalt dosage.
[0041] The selection of the gradation of the mixture is shown in Table 1, and the gradation curve of the mixture is shown infigure 1 shown.
[0042] Table 1 Selection of mixture gradation
[0043]
[0044] 2. Determination of optimal asphalt dosage
[0045] For the above design gradation, the Marshall test piece is made by double-sided compaction of 75 times. The amount of asphalt is 3...
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Abstract
The invention relates to a test detection method for the equivalent compaction function of an asphalt mixture and an application, and belongs to the technical field of road engineering. The method includes the steps that the asphalt mixture is subjected to a mixture proportion design test, the optimal asphalt amount is determined, and the gross volume relative density is calculated; a trial road section is paved, the number of grinding times of a site compaction machine generated when grinding is carried out till density is not increased any more is recorded, and a core sample is taken in site to measure the gross volume relative density; the compaction degree is calculated, and according to the gross volume density and the compaction degree of the obtained sample, by adjusting the number of the compaction times and the compaction temperature, the maximum number of the compaction times and the lowest compaction temperature are finally determined to correct the method of a standard indoor Marshall test; a Marshall correction test piece is prepared, and the compaction degree of a construction site is measured with the gross volume relative density of the Marshall correction test piece as the standard. According to the test detection method, the actual compaction degree of the construction site can be more accurately measured; meanwhile, the lowest compaction temperature of the mixture is determined, the mixing temperature and the paving temperature are reasonably reduced, the construction speed is increased, and energy is saved.
Description
technical field [0001] The invention relates to an asphalt mixture equivalent compaction work test detection method and its application, belonging to the technical field of road engineering. Background technique [0002] Asphalt pavement is the main structural form of high-grade highways in my country. With the development of the national economy, the traffic volume has increased rapidly, coupled with large-scale vehicles, serious overloading and channelized traffic, etc., which have caused serious early damage to asphalt pavement. A large number of studies have shown that : The early damage of asphalt pavement in our country is directly related to the degree of compaction of the road surface. The road surface with insufficient compaction degree is prone to rutting, water seepage, fatigue and other diseases; and overpressure will cause oil flooding and instability on the road surface. [0003] Marshall tests provide many important design parameters for road construction. The...
Claims
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IPC IPC(8): G01N1/28G01N3/34
CPCG01N1/286G01N3/34
Inventor于立泽任少辉温忠海左贵林刘丹丹赵思博高波张宝珠徐岩
Owner黑龙江省交通运输信息和规划研究中心