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Evaluation test method for determining mixing amount of additive for improving asphalt adhesiveness

A test method and technology for admixtures, which are applied in the measurement of color/spectral characteristics, measuring devices, climate sustainability, etc., can solve the problems of difficulty in determining the optimal dosage of admixtures and unclear compatibility of asphalt mixtures, etc. Achieve the effect of improving water damage resistance, saving project cost and improving adhesion

Pending Publication Date: 2022-08-09
宁夏交通建设股份有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems that the compatibility between the existing asphalt and aggregate adhesion admixture and asphalt mixture is not clear and the optimal dosage of the admixture is difficult to determine, and a method for determining the asphalt adhesion improvement is provided. The test method for evaluating the optimal dosage of admixture

Method used

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  • Evaluation test method for determining mixing amount of additive for improving asphalt adhesiveness
  • Evaluation test method for determining mixing amount of additive for improving asphalt adhesiveness
  • Evaluation test method for determining mixing amount of additive for improving asphalt adhesiveness

Examples

Experimental program
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Effect test

Embodiment 1

[0044]Adhesion of limestone asphalt mixtures was analyzed, Table 4 shows the colorimeter readings of limestone asphalt mixtures in boiled and uncooked conditions with different dosages of admixtures LOF 6500, Evotherm U3 and Morelife 500; Feed L* read 62.54.

[0045] Table 4 Color difference results of asphalt mixture with limestone aggregate

[0046]

[0047] Calculate the peeling percentage of limestone asphalt mixture by formula (1) As shown in Table 5.

[0048] Table 5 Peeling percentage of limestone asphalt mixture ( (%))

[0049] Additive dosage (%) 0.0001 0.15 0.25 0.5 0.75 1 LOF6500 9.12 1.91 1.64 1.43 0.91 0.34 EvothermU3 8.02 1.37 0.91 0.68 0.46 0.23 Morelife500 8.92 2.05 1.82 1.59 0.91 0.79

[0050] Plot different admixture dosage and peel percentage of limestone asphalt mixture relationship curve see figure 1 . Depend on figure 1 It can be seen that all three admixtures have the same trend at differ...

Embodiment 2

[0052] The difference between this example and Example 1 is that the asphalt mixture aggregate is different, and granite is selected.

[0053] The adhesion of granite asphalt mixture was analyzed by the method of Example 1. Table 6 shows the colorimeter readings of granite asphalt mixtures with different dosages of admixtures LOF 6500, Evotherm U3 and Morelife 500 under boiled and uncooked conditions; the reading of granite raw aggregate L* is 61.76.

[0054] Table 6 Color difference results of asphalt mixture with granite aggregates

[0055]

[0056] Calculate the peeling percentage of granite asphalt mixture by formula (1) As shown in Table 7.

[0057] Table 7 Peeling percentage of granite asphalt mixture ( (%))

[0058] Additive dosage (%) 0.0001 0.15 0.25 0.5 0.75 1 LOF6500 8.28 7.35 6.18 5.93 5.96 4.82 EvothermU3 6.76 5.51 4.62 3.92 3.67 2.40 Morelife500 7.59 6.93 5.52 4.16 3.45 2.88

[0059] Plot different ad...

Embodiment 3

[0061] In this example, the optimum admixture dosage of the asphalt mixture prepared from limestone and granite is determined according to Examples 1 and 2.

[0062] The colorimetric parameters obtained by the colorimeter device were used for the asphalt mixture samples before and after boiling, and the peel percentage values ​​of different asphalt mixtures were calculated. According to the method for determining the optimum admixture dosage, the admixture dosage for the loss of 10% of the adhesion force was calculated. Take the asphalt mixture prepared from limestone aggregate containing LOF 6500 admixture as an example ( figure 1 ), the optimum admixture dosage is calculated as follows:

[0063] (1) When the amount of admixture is 0% (adhesion loss is 100%),

[0064] (2) Adhesion loss reduced by 90%,

[0065] (3) Adhesion loss reduced to 10%,

[0066] (4) According to figure 1 The fitted equation of LOF 6500 admixture dosage and peel percentage obtained in , was d...

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Abstract

The evaluation test method for determining the mixing amount of the additive for improving the asphalt adhesiveness has the advantages that the compatibility of the additive and an asphalt mixture is judged, and the mixing amount of the additive is accurately controlled. The method comprises the following steps: by adopting a boiling method and combining a colorimeter, accurately obtaining the stripping percentage of different admixture asphalt mixtures after boiling, drawing a stripping percentage graph of the admixture mixing amount and the asphalt mixtures, judging the compatibility of the admixture and the asphalt mixtures according to a fitting curve correlation coefficient, and preferably selecting a suitable admixture; and on the basis, determining the optimal mixing amount of the additive required for excellent adhesiveness of the asphalt mixture. According to the method, the adhesiveness of the asphalt and the aggregate can be remarkably improved, the water damage resistance of the asphalt mixture can be improved, the construction cost can be saved, and on-site asphalt mixture quality control can be guided, so that a guarantee is provided for the durability of an asphalt pavement.

Description

technical field [0001] The invention relates to the field of road durability, in particular to a test method for determining the amount of an admixture for improving the adhesion of asphalt. technical background [0002] As the pavement is smooth, wear-resistant, and easy to maintain, asphalt pavement has become the preferred type of pavement for road construction. However, during the service process of asphalt pavement, it will be affected by rainwater infiltration, water vapor absorption and adsorption, rising groundwater level or various factors. In the presence of moisture, the loss of the bituminous film on the surface of the hydrophilic aggregate leads to a decrease in the adhesion between the bitumen and aggregate, resulting in various types of pavement diseases such as rutting, hugging, squeezing, loosening, pitting Grooves and cracks. Therefore, in order to prevent the durability failure of asphalt pavement caused by water damage during the wear process of asphalt...

Claims

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Application Information

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IPC IPC(8): G01N25/00G01N21/25
CPCG01N25/00G01N21/251Y02W30/91
Inventor 冀卫东张志涛惠迎新沈建成贾小龙杨洋韩方元张亚军
Owner 宁夏交通建设股份有限公司