A detection method for the coating degree of cement emulsified asphalt on mineral materials

A technology of cement emulsified asphalt and a detection method, which is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials, etc. , to achieve the effect of accurate and reliable test results and simple equipment

Active Publication Date: 2018-04-17
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In general consideration, this test method is greatly affected by the interaction of aggregates, and cannot accurately reflect the coating of asphalt on a single aggregate.

Method used

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  • A detection method for the coating degree of cement emulsified asphalt on mineral materials
  • A detection method for the coating degree of cement emulsified asphalt on mineral materials
  • A detection method for the coating degree of cement emulsified asphalt on mineral materials

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Cement emulsified asphalt mortar on the aggregate surface of the cement emulsified asphalt mixture with a particle size of 9.5mm-13.2mm (in this embodiment, the emulsified asphalt in the cement emulsified asphalt mortar is cationic emulsified asphalt, with a solid content of 60%, and the emulsified asphalt quality and The mass ratio of cement is 3:2, and the mineral material is limestone.) Coating performance of the layer under hydrochloric acid erosion:

[0044] Wash the aggregate, dry it at 50-60°C for 1.5h, and wash it with deionized water for 5min;

[0045] Take 10mL of 12.7mol / L concentrated hydrochloric acid and dilute it to 10 times the concentration, put the cleaned aggregate coated with cement emulsified asphalt into it for erosion, take 10mL of the erosion solution every 20min, and then dilute it 10 times; take 20mL of the dilution In the Erlenmeyer flask, add 2mL of triethanolamine solution, then add 10mL of NH with pH=10 3 -NH 4 Cl buffer solution, and the...

Embodiment 2

[0053] Measured A, B, C, D (particle size 9.5mm-13.2mm) four kinds of RAP with different shape indexes adhered to cement emulsified asphalt mortar and eroded in acid solution for 20min to release k (k is the unit mass of cement emulsified asphalt The amount of substance of the dissolved matter) value size:

[0054] Wash the four kinds of RAP aggregates separately, dry them at 50-60°C for 1.5h and weigh them. Use a digital camera to take pictures of the three vertical directions of the RAP aggregates, and collect photos of each aggregate under the same parameters. Such as image 3 As shown, IPP software is used to automatically analyze the projected area and perimeter of each picture aggregate, and the shape index S of the projected surface is calculated using formula (3).

[0055]

[0056] where SF is the shape index; l is the projected perimeter; A is the projected area. (Note: The calculation uses photo pixel units)

[0057] After carrying out the adhesion test of the ...

Embodiment 3

[0064] Cement, emulsified asphalt, limestone mineral aggregates and other materials are selected, and the continuous dense graded mixture is selected to make standard Marshall specimens in accordance with the requirements of the "Test Regulations for Asphalt and Asphalt Mixtures" (JTGE20-2011).

[0065] in:

[0066] The amount of cement in the Marshall test piece of group A is 2%, and the amount of emulsified asphalt is 7%;

[0067] The amount of cement in the Marshall specimens of group B is 2%, and the amount of emulsified asphalt is 8%;

[0068] The amount of cement in the Marshall specimens of group C is 2%, and the amount of emulsified asphalt is 9%.

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Abstract

The invention relates to a method for detecting the coating degree of cement emulsified asphalt on mineral materials. The method includes eroding the test piece with an acidic solution, and titrating the dissolved matter of the test piece in the eroding solution with an EDTA standard solution. The present invention uses the titration of EDTA solution to measure the release of Ca2+ and Mg2+ ions at different times by means of complexometric titration experiments, and evaluates the coating degree of the cement emulsified asphalt mortar on the surface of the mineral material. During the test, the mineral material is affected by the outside world. Small, can reflect the microscopic status quo, and the equipment used is simple.

Description

technical field [0001] The invention belongs to the technical field of coating performance of cement emulsified asphalt, in particular to a method for quantitatively evaluating the coating degree of cement emulsified asphalt mortar on the surface of mineral materials. Background technique [0002] In recent years, cement emulsified asphalt mixture has been widely used in road engineering, and its notable advantages are environmental protection and resource saving. However, the adhesive layer of cement emulsified asphalt composite material on the mineral material has a porous structure, and there are problems with the uniformity of the material. The impermeability, uniformity, and coating effect of the cement emulsified asphalt layer have defects. When the solution is eroded, water molecules, H + Ions easily enter the cement emulsified asphalt layer from the pores, erode the hydration phase, and enter the interface layer, making the asphalt easy to peel off from the mineral ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/79
Inventor 王振军刘亮吴佳育安等等徐闯王红飞张婷雷奔张申冯雷
Owner CHANGAN UNIV
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