CN105300978A - Method for detecting whether warm mix asphalt contains oil-soluble amine surfactant warm mix agent - Google Patents

Abstract

The invention relates to a method for detecting an oil-soluble amine surfactant warm mix agent in warm mix asphalt, comprising the following steps: (1) weighing a sample to be tested, adding a solvent, and heating until the solvent is slightly boiling and the color changes to light yellow; (2) pour out the supernatant in step (1), and drop into the detection reagent, observe the color change of the supernatant; (3) pour out the supernatant in step (1), and heat clear liquid, then drip detection reagent, observe the color change of clear liquid, (4) judge whether to contain oil-soluble amine surfactant type warm mixing agent in the sample to be tested according to step (2) and step (3). The color reaction detection method in the present invention has low requirements on test instruments, equipment and test personnel, low test cost, high sensitivity and high practical value.

Description

A detection method for warm mix agent containing oil-soluble amine surfactant in warm mix asphalt

technical field

The invention belongs to the technical field of warm mixing of highway asphalt pavement, and in particular relates to a detection method for a warm mixing agent containing an oil-soluble amine surfactant in warm mixing asphalt.

Background technique

Warm mix asphalt pavement material has been widely concerned and applied due to its advantages of low carbon, environmental protection, energy saving and emission reduction. At present, warm mix asphalt pavement materials based on surfactant-type warm mix agent are commonly used in the market. It has been developed to the third generation. After a certain processing technology, a product with stable quality can be formed, which can reduce the temperature of asphalt mixing and construction. It greatly simplifies the production process in the process of use, does not need to modify the existing mixing equipment, and reduces the dependence on the equipment; at the same time, the large-scale industrial production greatly reduces the quality variability, and the asphalt and asphalt mixture The road performance is guaranteed.

At present, there is no detection method for the existence of warm mix agent in warm mix asphalt, and the relevant technical specifications of warm mix asphalt have not been formulated, so it is impossible to supervise and control its quality. Therefore, in order to effectively detect the warm mix agent in warm mix asphalt, It is of great significance to provide a rapid and convenient detection method.

Contents of the invention

The present invention uses the phenomenon that the solution turns blue after the chemical reaction between the warm mix agent and the bromophenol blue indicator to qualitatively detect whether the warm mix agent exists in the warm mix asphalt. There is no way to detect the agent.

Technical scheme of the present invention is as follows:

A kind of warm mix agent detection method containing oil-soluble amine surfactant in warm mix asphalt, comprises the following steps:

(1) Weigh the sample to be tested, add solvent, and heat until the solvent is slightly boiling and the color turns light yellow;

(2) Pour out the supernatant in step (1), and drop into the detection reagent, observe the color change of the supernatant;

(3) Pour out the supernatant in step (1), and heat the supernatant, then drip the detection reagent, observe the color change of the supernatant,

(4) judge according to step (2) and step (3) whether contain oil-soluble amine surfactant type warm mixing agent in the sample to be tested,

The detection reagent is a bromophenol blue indicator dissolved in a neutral organic solvent.

The detection reagent is composed of the following components: 10-100ml of isopropanol and 0.02-3.0g of bromophenol blue.

Preferably, the isopropanol is analytically pure.

Preferably, the added amount of the sample to be tested in the step (1) is 0.1-2.0 g; the added amount of the solvent is: 10-200 ml.

Preferably, the solvent in the step (1) is isopropanol.

Preferably, the amount of detection reagent added in the step (2) is 3-5 drops.

Preferably, the heating time in the step (3) is 1-3 min, and the amount of detection reagent added is 3-5 drops.

Preferably, whether oil-soluble amine surfactant type warm mixing agent is contained in the sample to be tested in the described step (4) is: the color of the clear liquid in the step (2) turns blue, and the clear liquid in the step (3) The color of the solution turns bright yellow to indicate that the sample to be tested contains warm mixing agent; if the color of the clear solution in step (2) turns blue, the color of the clear solution in step (3) also turns blue, indicating that there is no Contains a warming agent; if the clear liquid does not change color or changes in non-blue color (including light green, dark green, etc.) in step (2), it means that the sample to be tested does not contain a warming agent.

The principle of the present invention is extraction and indicator color development: use isopropanol to extract the warm mix agent in the warm mix asphalt, heating helps to accelerate this process, and then the indicator reacts with the warm mix agent to form a blue substance , so the clear liquid turns blue; of course, this process will also extract the substances dissolved in isopropanol in the asphalt, and the yellow substances are some components in the asphalt, even if there is no warm mix agent, the asphalt itself Adding isopropanol and heating will also show the phenomenon of yellowing, and the substance detected by the indicator is transparent and colorless in isopropanol.

Adding the indicator directly will lead to an excessive amount of the indicator, and the color of the indicator will interfere with the judgment of the color and affect the test result; the purpose of diluting the indicator with a solvent is to reduce its concentration. Too much, no more than 5 drops, otherwise it will affect the test results.

Therefore, the slight boiling in step (1) turns light yellow, indicating that the heating time is not long (if the heating time is too long, the dark-colored substances in the asphalt will also be extracted, thereby interfering with the judgment of the color), so that the extracted warm mix agent The amount is less, and the warm mixing agent has a certain volatility. In step (3), the clear liquid is continuously heated for a long time, and the warm mixing agent is volatilized. Therefore, after the indicator is added, only the color of the indicator and the color of the clear liquid are superimposed. color.

The beneficial effects of the present invention are as follows:

1 The present invention provides a detection method for the presence of warm mix agent in warm mix asphalt.

2. In the present invention, the requirements for experimental instruments, equipment and testing personnel are not high, the testing cost is low, and it has high practical value.

3 The inventor has carried out the measurement of a large amount of data to the detection method, and this detection method is in good use, indicating that the test method of the present invention is reasonable, reliable and practical.

detailed description

The present invention will be further described below in combination with specific embodiments.

Example 1

A detection reagent for warm mix agent in warm mix asphalt, consisting of the following components in parts by weight

Isopropanol (100ml), bromophenol blue: 0.2g.

Using the above warm mix agent detection reagent in warm mix asphalt to detect a certain kind of warm mix asphalt, including the following steps:

(1) Weigh 1g of warm-mix asphalt into a beaker, then add 50ml of isopropanol, and heat until the isopropanol is slightly boiling and the color turns light yellow;

(2) Pour out the supernatant in step (1), and add 5 drops of detection reagent, observe the color change of the supernatant, and the color of the supernatant turns blue;

(3) Pour out the supernatant in step (1), heat and boil the clear liquid, keep boiling for 2 minutes, then drop in the detection reagent, observe the color change of the clear liquid, and the color of the clear liquid becomes bright yellow;

(4) indicates that the sample to be tested contains a warm mixing agent.

Conclusion: It is consistent with the fact that oil-soluble amine surfactant type warm mixing agent is added.

Example 2

A detection reagent for warm mix agent in warm mix asphalt, consisting of the following components in parts by weight

Isopropanol (100ml), bromophenol blue: 0.3g.

Using the above warm mix agent detection reagent in warm mix asphalt to detect a certain kind of warm mix asphalt, including the following steps:

(1) Weigh 0.5g of warm-mix asphalt into a beaker, then add 40ml of isopropanol, and heat until the isopropanol is slightly boiling and the color turns light yellow;

(2) Pour out the supernatant in step (1), and add 5 drops of detection reagent, observe the color change of the supernatant, and the color of the supernatant turns blue;

(3) Pour out the supernatant in step (1), heat and boil the clear liquid, keep boiling for 1 min, then drop in the detection reagent, observe the color change of the clear liquid, and the clear liquid turns blue;

(4) means that the sample to be tested does not contain warm mixing agent.

Conclusion: It is consistent with the fact that oil-soluble amine surfactant type warm mixing agent is not added.

Example 3

A detection reagent for warm mix agent in warm mix asphalt, consisting of the following components in parts by weight

Isopropanol (50ml), bromophenol blue: 0.08g.

Using the above warm mix agent detection reagent in warm mix asphalt to detect a certain kind of warm mix asphalt, including the following steps:

(1) Weigh 1.5g of warm-mix asphalt into a beaker, then add 50ml of isopropanol, and heat until the isopropanol is slightly boiling and the color turns light yellow;

(2) Pour out the supernatant in step (1), add 5 drops of detection reagent, observe the color change of the supernatant, and the color of the supernatant turns bright yellow.

(3) means that the sample to be tested does not contain warm mixing agent.

Conclusion: It is consistent with the fact that oil-soluble amine surfactant type warm mixing agent is not added.

Claims (8)

1. a containing oil soluble amine surfactants warm-mixing agent detection method in warm-mixed asphalt, comprises the following steps:

(1) take testing sample, and add solvent, be heated to solvent and be slight boiling condition and color becomes light yellow;

(2) supernatant liquor in step (1) is poured out, and instillation detects reagent, observe the color change of clear liquid;

(3) poured out by the supernatant liquor in step (1), and heat clear liquid, then instillation detects reagent, observes the color change of clear liquid,

(4) judge whether containing oil-soluble amine surfactant type warm-mixing agent in testing sample according to step (2) and step (3),

Described detection reagent is the bromophenol blue indicator be dissolved in neutral organic solvent.

2. detection method according to claim 1, described detection reagent is composed of the following components: 10 ~ 100ml isopropyl alcohol, 0.02 ~ 3.0g bromophenol blue.

3. detection method according to claim 2, described isopropyl alcohol is pure for analyzing.

4. detection method according to claim 1, in described step (1), the addition of testing sample is 0.1-2.0g; The addition of solvent is: 10-200ml.

5. detection method according to claim 4, the solvent in described step (1) is isopropyl alcohol.

6. detection method according to claim 2, the addition detecting reagent in described step (2) is that 3-5 drips.

7. detection method according to claim 6, the heat time in described step (3) is 1-3min, and the addition detecting reagent is that 3-5 drips.

8. detection method according to claim 1, in described step (4) in testing sample containing oil-soluble amine surfactant type warm-mixing agent be whether: the clear liquid color in step (2) becomes blueness, and in step (3), clear liquid color becomes glassy yellow and represents in testing sample containing warm-mixing agent; If the clear liquid color in step (2) becomes blue, in step (3), clear liquid color also becomes blueness, represents in testing sample not containing warm-mixing agent; If clear liquid nondiscolouring or occur that the change of non-blueness represents in testing sample not containing warm-mixing agent in step (2).