Preparation method of compound modified asphalt

Abstract

The invention provides a preparation method of compound modified asphalt. The preparation method comprises the following steps: I, weighing sillimanite powder, andalusite powder and andesite powder in certain percentage by mass, and then uniformly mixing the weighed mineral powder to obtain mixed powder; II, adding a dispersant into the mixed powder to uniformly mix so as to obtain dispersed mixed powder; III, adding a surfactant into the dispersed mixed powder to uniformly mix so as to obtain solubilized mixed powder; IV, soaking the solubilized mixed powder in anhydrous ethanol and drying to obtain a compound modifying additive; and V, adding the compound modifying additive into matrix asphalt and heating and shearing to obtain the compound modified asphalt. The compound modified asphalt prepared by the preparation method has good stability and durability while a good pavement performance is guaranteed.

Description

technical field

[0001] The invention belongs to the technical field of road engineering materials, and in particular relates to a preparation method of composite modified asphalt. Background technique

[0002] With the rapid development of highway construction in our country, asphalt pavement has been widely used in road construction because of its many advantages such as smooth surface, no joints, low noise, and easy maintenance and repair. However, asphalt pavement is prone to rutting when it is hot in summer, and cracks are prone to appear when it is cold in winter. The pavement surface layer will also appear loose, peeling, oily, surface polishing, asphalt aging, pavement seepage and other diseases, which will make the service performance of asphalt pavement and The service life is also shortened accordingly, which brings losses to the national economy. Moreover, the modified asphalt prepared by existing modifiers has single performance, poor operability during processi...

Examples

Embodiment 1

[0023] The preparation method of the present embodiment composite modified asphalt comprises the following steps:

[0024] Step 1. Weigh various mineral powders in the following mass percentages: 59.4% of sillimanite powder, 39.2% of andalusite powder, and 1.4% of andesite powder; then mix the weighed various mineral powders evenly to obtain a mixed powder; The particle size of sillimanite powder, andalusite powder and andesite powder is 37μm~74μm;

[0025] Step 2, adding the dispersant to the mixed powder described in step 1 and mixing uniformly to obtain the mixed powder after dispersion treatment; the dispersant is the isopropanol solution of stearamide, and the isopropanol of the stearamide is The mass ratio of rigid amide and isopropanol in the solution is 1: 1.2; the addition of the dispersant is 0.5% of the mixed powder mass;

[0026] Step 3, adding the surfactant to the mixed powder after the dispersion treatment described in step 2 and mixing evenly to obtain the mix...

Embodiment 2

[0030] The preparation method of the present embodiment composite modified asphalt comprises the following steps:

[0031] Step 1. Weigh various mineral powders in the following mass percentages: 23% of sillimanite powder, 76.1% of andalusite powder, and 0.9% of andesite powder; then mix the weighed various mineral powders evenly to obtain a mixed powder; The particle size of sillimanite powder, andalusite powder and andesite powder is 61μm~165μm;

[0032] Step 2, adding the dispersant to the mixed powder described in step 1 and mixing uniformly to obtain the mixed powder after dispersion treatment; the dispersant is the isopropanol solution of stearamide, and the isopropanol of the stearamide is The mass ratio of rigid amide and isopropanol in the solution is 1:1; the addition of the dispersant is 0.8% of the mixed powder mass;

[0033] Step 3, adding the surfactant to the mixed powder after the dispersion treatment described in step 2 and mixing evenly to obtain the mixed p...

Embodiment 3

[0037] The preparation method of the present embodiment composite modified asphalt comprises the following steps:

[0038] Step 1. Weigh various mineral powders in the following mass percentages: 43% of sillimanite powder, 56% of andalusite powder, and 1% of andesite powder; then mix the weighed various mineral powders evenly to obtain a mixed powder; The particle size of sillimanite powder, andalusite powder and andesite powder is 150μm~212μm;

[0039] Step 2, adding the dispersant to the mixed powder described in step 1 and mixing uniformly to obtain the mixed powder after dispersion treatment; the dispersant is the isopropanol solution of stearamide, and the isopropanol solution of the stearamide The mass ratio of rigid amide and isopropanol in the solution is 1: 1.5; the addition of the dispersant is 0.6% of the mixed powder mass;

[0040]Step 3, adding the surfactant to the mixed powder after the dispersion treatment described in step 2 and mixing evenly to obtain the mi...

technical field

[0001] The invention belongs to the technical field of road engineering materials, and in particular relates to a preparation method of composite modified asphalt. Background technique

[0002] With the rapid development of highway construction in our country, asphalt pavement has been widely used in road construction because of its many advantages such as smooth surface, no joints, low noise, and easy maintenance and repair. However, asphalt pavement is prone to rutting when it is hot in summer, and cracks are prone to appear when it is cold in winter. The pavement surface layer will also appear loose, peeling, oily, surface polishing, asphalt aging, pavement seepage and other diseases, which will make the service performance of asphalt pavement and The service life is also shortened accordingly, which brings losses to the national economy. Moreover, the modified asphalt prepared by existing modifiers has single performance, poor operability during processi...

Examples

Embodiment 1

[0023] The preparation method of the present embodiment composite modified asphalt comprises the following steps:

[0024] Step 1. Weigh various mineral powders in the following mass percentages: 59.4% of sillimanite powder, 39.2% of andalusite powder, and 1.4% of andesite powder; then mix the weighed various mineral powders evenly to obtain a mixed powder; The particle size of sillimanite powder, andalusite powder and andesite powder is 37μm~74μm;

[0025] Step 2, adding the dispersant to the mixed powder described in step 1 and mixing uniformly to obtain the mixed powder after dispersion treatment; the dispersant is the isopropanol solution of stearamide, and the isopropanol of the stearamide is The mass ratio of rigid amide and isopropanol in the solution is 1: 1.2; the addition of the dispersant is 0.5% of the mixed powder mass;

[0026] Step 3, adding the surfactant to the mixed powder after the dispersion treatment described in step 2 and mixing evenly to obtain the mix...

Embodiment 2

[0030] The preparation method of the present embodiment composite modified asphalt comprises the following steps:

[0031] Step 1. Weigh various mineral powders in the following mass percentages: 23% of sillimanite powder, 76.1% of andalusite powder, and 0.9% of andesite powder; then mix the weighed various mineral powders evenly to obtain a mixed powder; The particle size of sillimanite powder, andalusite powder and andesite powder is 61μm~165μm;

[0032] Step 2, adding the dispersant to the mixed powder described in step 1 and mixing uniformly to obtain the mixed powder after dispersion treatment; the dispersant is the isopropanol solution of stearamide, and the isopropanol of the stearamide is The mass ratio of rigid amide and isopropanol in the solution is 1:1; the addition of the dispersant is 0.8% of the mixed powder mass;

[0033] Step 3, adding the surfactant to the mixed powder after the dispersion treatment described in step 2 and mixing evenly to obtain the mixed p...

Embodiment 3

[0037] The preparation method of the present embodiment composite modified asphalt comprises the following steps:

[0038] Step 1. Weigh various mineral powders in the following mass percentages: 43% of sillimanite powder, 56% of andalusite powder, and 1% of andesite powder; then mix the weighed various mineral powders evenly to obtain a mixed powder; The particle size of sillimanite powder, andalusite powder and andesite powder is 150μm~212μm;

[0039] Step 2, adding the dispersant to the mixed powder described in step 1 and mixing uniformly to obtain the mixed powder after dispersion treatment; the dispersant is the isopropanol solution of stearamide, and the isopropanol solution of the stearamide The mass ratio of rigid amide and isopropanol in the solution is 1: 1.5; the addition of the dispersant is 0.6% of the mixed powder mass;

[0040]Step 3, adding the surfactant to the mixed powder after the dispersion treatment described in step 2 and mixing evenly to obtain the mi...

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