Method for determining rubber use amount of polyurethane mixture with high rubber particle mixing amount

Abstract

The invention provides a method for determining the rubber use amount of a polyurethane mixture with high rubber particle mixing amount. The method comprises the following steps: 1) preparing the polyurethane mixture by adopting pure stone grading, and testing the rubber use amount of the polyurethane mixture; 2) calculating the oil absorption ratio of each grade of aggregate according to the surface area coefficient corresponding to each grade of aggregate of the polyurethane mixture; 3) testing the saturation time of the rubber particles for absorbing the polyurethane adhesive and the oil absorption of the rubber particles and the stone with the same particle size, and calculating the proportional relation of the oil absorption ratios of the rubber particles and the stone with the same volume; and 4) replacing stones with corresponding particle sizes according to the rubber particles, and calculating the rubber use amount of the polyurethane mixture with high rubber particle mixing amount in combination with the oil absorption ratio. The method provided by the invention is used for determining the rubber use amount of the polyurethane mixture of which the mixing amount of the rubber particles exceeds 20%, and the pavement performance of the high-rubber-particle polyurethane mixture can be optimized.

Description

technical field

[0001] The invention relates to the technical field of road engineering, in particular to a method for determining the amount of glue used in a polyurethane mixture with high rubber particle content. Background technique

[0002] The polyurethane mixture with high rubber particle content is a polyurethane mixture formed by replacing the corresponding particle size stone with rubber particles of a specific particle size (1.18-9.5mm), and its rubber particle content is higher than 20%. Due to the addition of rubber particles, when the tire load acts on the polyurethane mixture, the rubber particles inside the mixture are elastically deformed under pressure, and the rebound of the rubber particles can be used after unloading to restore the rut; stone, so that the mixture has a higher ultimate bending and tensile strain under low temperature conditions. At the same time, the density of rubber particles is about 40% to 50% of the density of stone materials. The a...

Examples

Embodiment 1

[0092] This example provides a method for determining the amount of glue used in polyurethane mixtures with high rubber particle content, in which the polyurethane is selected from 2,6-TDI adhesive, and the gradation particle size replaced by rubber particles is 4.75-9.5mm, and the mass percentage is 34%, and the replacement ratio is 70%. The gradation before and after the replacement of stone materials is shown in Table 2. The density of stone materials is 2.5 times that of rubber particles. Specifically, the following steps are included:

[0093] Table 2 Gradation before and after stone replacement in Example 1

[0094]

[0095] Step 1: Using pure stone gradation, test the amount of glue P by Marshall test method 石 = 4.9%.

[0096] Step 2: According to the surface area coefficient of each grade of aggregate, determine the oil absorption ratio of each grade of aggregate, and the gradation data of the original mixture is shown in Table 3:

[0097] The surface area of ​​ea...

Embodiment 2

[0135] This example provides a method for determining the amount of glue used in polyurethane mixtures with high rubber particle content, wherein the polyurethane uses 2,4-TDI adhesive, the rubber particles replace the graded particle size of 4.75-9.5mm, and the mass percentage is 36%, and the replacement ratio is 80%. The gradation before and after the replacement of the stone is shown in Table 5. The density of the stone is 2.4 times that of the rubber particles. The specific steps are as follows:

[0136] Table 5 Example 2 Gradation before and after stone replacement

[0137]

[0138] Step 1: Using pure stone gradation, test the amount of glue P by Marshall test method 石 = 4.8%.

[0139] Step 2: According to the surface area coefficient of each grade of aggregate, determine the oil absorption ratio of each grade of aggregate, and the gradation data of the original mixture is shown in Table 6:

[0140] Table 6 The surface area of ​​each grade aggregate of embodiment 2 ...

Embodiment 3

[0177] This embodiment provides a method for determining the amount of glue used in a polyurethane mixture with a high rubber particle content, wherein the polyurethane is selected from MDI adhesive, and the rubber particle is replaced by a graded particle size of 2.36-4.75mm, and the mass percentage is 20.2%. The ratio is 100%. The gradation before and after the replacement of the stone is shown in Table 8. The density of the stone is 2.35 times that of the rubber particles. The specific steps are as follows:

[0178] Table 8 Example 3 Gradation before and after stone replacement

[0179]

[0180] Step 1: Using pure stone gradation, test the amount of glue P by Marshall test method 石 = 5.1%.

[0181] Step 2: According to the surface area coefficient of each grade of aggregate, determine the proportion of oil absorption of each grade of aggregate, and the gradation data of the original mixture is shown in Table 9:

[0182] The surface area of ​​each file aggregate of tabl...

technical field

[0001] The invention relates to the technical field of road engineering, in particular to a method for determining the amount of glue used in a polyurethane mixture with high rubber particle content. Background technique

[0002] The polyurethane mixture with high rubber particle content is a polyurethane mixture formed by replacing the corresponding particle size stone with rubber particles of a specific particle size (1.18-9.5mm), and its rubber particle content is higher than 20%. Due to the addition of rubber particles, when the tire load acts on the polyurethane mixture, the rubber particles inside the mixture are elastically deformed under pressure, and the rebound of the rubber particles can be used after unloading to restore the rut; stone, so that the mixture has a higher ultimate bending and tensile strain under low temperature conditions. At the same time, the density of rubber particles is about 40% to 50% of the density of stone materials. The a...

Examples

Embodiment 1

[0092] This example provides a method for determining the amount of glue used in polyurethane mixtures with high rubber particle content, in which the polyurethane is selected from 2,6-TDI adhesive, and the gradation particle size replaced by rubber particles is 4.75-9.5mm, and the mass percentage is 34%, and the replacement ratio is 70%. The gradation before and after the replacement of stone materials is shown in Table 2. The density of stone materials is 2.5 times that of rubber particles. Specifically, the following steps are included:

[0093] Table 2 Gradation before and after stone replacement in Example 1

[0094]

[0095] Step 1: Using pure stone gradation, test the amount of glue P by Marshall test method 石 = 4.9%.

[0096] Step 2: According to the surface area coefficient of each grade of aggregate, determine the oil absorption ratio of each grade of aggregate, and the gradation data of the original mixture is shown in Table 3:

[0097] The surface area of ​​ea...

Embodiment 2

[0135] This example provides a method for determining the amount of glue used in polyurethane mixtures with high rubber particle content, wherein the polyurethane uses 2,4-TDI adhesive, the rubber particles replace the graded particle size of 4.75-9.5mm, and the mass percentage is 36%, and the replacement ratio is 80%. The gradation before and after the replacement of the stone is shown in Table 5. The density of the stone is 2.4 times that of the rubber particles. The specific steps are as follows:

[0136] Table 5 Example 2 Gradation before and after stone replacement

[0137]

[0138] Step 1: Using pure stone gradation, test the amount of glue P by Marshall test method 石 = 4.8%.

[0139] Step 2: According to the surface area coefficient of each grade of aggregate, determine the oil absorption ratio of each grade of aggregate, and the gradation data of the original mixture is shown in Table 6:

[0140] Table 6 The surface area of ​​each grade aggregate of embodiment 2 ...

Embodiment 3

[0177] This embodiment provides a method for determining the amount of glue used in a polyurethane mixture with a high rubber particle content, wherein the polyurethane is selected from MDI adhesive, and the rubber particle is replaced by a graded particle size of 2.36-4.75mm, and the mass percentage is 20.2%. The ratio is 100%. The gradation before and after the replacement of the stone is shown in Table 8. The density of the stone is 2.35 times that of the rubber particles. The specific steps are as follows:

[0178] Table 8 Example 3 Gradation before and after stone replacement

[0179]

[0180] Step 1: Using pure stone gradation, test the amount of glue P by Marshall test method 石 = 5.1%.

[0181] Step 2: According to the surface area coefficient of each grade of aggregate, determine the proportion of oil absorption of each grade of aggregate, and the gradation data of the original mixture is shown in Table 9:

[0182] The surface area of ​​each file aggregate of tabl...

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