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Determination of solid content of emulsified asphalt based on evaporation under low temperature and reduced pressure

A technology of emulsified asphalt and solid content, which is applied in the direction of weighing by removing certain components, can solve the problems of asphalt aging and poor result accuracy, and achieve the effect of complete evaporation, fast evaporation speed and high accuracy

Active Publication Date: 2022-07-19
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing method for measuring the solid content of emulsified asphalt has high-temperature evaporation to cause asphalt to age, and the accuracy of low-temperature evaporation is poor, and to provide a method for measuring the solid content of emulsified asphalt based on low-temperature decompression evaporation

Method used

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  • Determination of solid content of emulsified asphalt based on evaporation under low temperature and reduced pressure
  • Determination of solid content of emulsified asphalt based on evaporation under low temperature and reduced pressure

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Experimental program
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specific Embodiment approach 1

[0021] Embodiment 1: In this embodiment, the method for determining the solid content of emulsified asphalt based on low-temperature vacuum evaporation is carried out according to the following steps:

[0022] 1. Sample preparation: The sample container and glass rod are washed, dried and weighed for the total mass, denoted as m 1 ; Then prepare the emulsified asphalt sample according to the standard sampling method, weigh 100g ± 0.1g of the emulsified asphalt sample that is evenly stirred, and weigh the total mass of the sample container, glass rod and emulsified asphalt sample, denoted as m 2 ;

[0023] 2. Evaporating and emulsified asphalt sample: put the container containing the sample together with the glass rod into a vacuum drying oven for heating;

[0024] 3. Frequency conversion to adjust the degree of vacuum and observe the degree of evaporation:

[0025] Turn on the vacuum pump to pump air, and observe the state of the sample through the observation window. When t...

specific Embodiment approach 2

[0032] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the standard sampling method described in step 1: that is, standard sampling is carried out in accordance with the requirements of the "Asphalt and Asphalt Mixture Test Regulations for Highway Engineering" (JTG E20-2011). . Others are the same as the first embodiment.

specific Embodiment approach 3

[0033] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that in step 1, 100 g of a uniformly stirred emulsified asphalt sample is weighed. Others are the same as in the first or second embodiment.

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Abstract

A method for determining the solid content of emulsified asphalt based on low-temperature decompression evaporation, which relates to the field of transportation engineering. The method solves the problems that the existing method for determining the solid content of emulsified asphalt has the aging of the asphalt due to high temperature evaporation and the poor accuracy of the low temperature evaporation result. Methods: 1. Preparation of samples; 2. Evaporating emulsified asphalt samples; 3. Adjusting the vacuum degree by frequency conversion and observing the degree of evaporation; 4. Calculating the solid content. The test temperature of the invention is about 100°C, the asphalt sample has a small aging degree during the test, and the properties of the obtained evaporation residue are close to the actual performance, which can be used to evaluate the actual performance of the emulsified asphalt. The invention reduces the boiling point of the emulsified asphalt sample by reducing the pressure, and under the same test temperature, the evaporation rate is faster, the evaporation degree is more complete, and the accuracy is higher. The present invention is suitable for the determination of the solid content of emulsified asphalt.

Description

technical field [0001] The invention relates to the field of transportation engineering, in particular to a method for determining the solid content of emulsified asphalt. Background technique [0002] In road engineering, emulsified asphalt is widely used in different grades of pavement, including maintenance projects and new construction projects of highways, first-class highways and other lower-grade highways. The main basis for evaluating emulsified asphalt in China is the "Highway Engineering Asphalt and Asphalt Mixture Test Regulations" (JTG E20-2011), in which the evaporation residue obtained by the solid content determination test is the key prerequisite for evaluating the performance of emulsified asphalt. At present, the determination methods of emulsified asphalt solid content at home and abroad are mainly divided into four categories: direct heating evaporation method, distillation method, oven heating evaporation method and low temperature evaporation method. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N5/04
CPCG01N5/04
Inventor 徐慧宁杨旭升毕玉峰田东石浩
Owner HARBIN INST OF TECH