CN112946161A - Method for measuring mud content of recycled asphalt concrete powder - Google Patents
Method for measuring mud content of recycled asphalt concrete powder Download PDFInfo
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- CN112946161A CN112946161A CN202110305584.3A CN202110305584A CN112946161A CN 112946161 A CN112946161 A CN 112946161A CN 202110305584 A CN202110305584 A CN 202110305584A CN 112946161 A CN112946161 A CN 112946161A
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
Abstract
The invention relates to the technical field of building material determination, in particular to a method for determining the mud content of asphalt concrete recycled powder. The method comprises the steps of (a) preparing stone powder with zero mud content by a test mill after cleaning and drying or naturally drying the same sandstone aggregate for producing asphalt concrete, and reserving a sample for later use after screening; selecting similar or same soil samples around the sandstone raw material mine, drying, preparing mud powder, and screening to obtain a sample with 100% mud powder content for later use; preparing fixed values of mixed powder with different mud powder contents according to a known proportion, putting the fixed values into a 1000ml beaker, adding 500ml of distilled water or deionized water to perform a methylene blue test, measuring the corresponding methylene blue MB values of the different mud powder contents, and preparing a standard curve for later use through linear fitting; and (IV) measuring the methylene blue MB value of the recycled asphalt powder according to the method in the step (III), performing back-pushing according to a standard curve or a linear fitting formula, and quantitatively analyzing the content of the mud powder in the recycled asphalt powder.
Description
Technical Field
The invention relates to the technical field of building material determination, in particular to a method for determining the mud content of asphalt concrete recycled powder.
Background
The fine aggregate for producing the asphalt concrete in southwest is mainly produced by adopting the machine-made sand, however, the content of stone powder in the machine-made sand is higher (usually, the content of the stone powder is about 13 percent), the maximum mixing amount of the asphalt concrete recovery powder produced by the machine-made sand is about 35kg according to the production of each ton of the asphalt concrete, the maximum mixing amount of the asphalt concrete recovery powder according to the existing standard cannot exceed 25 percent of the total mineral powder mixing amount, and the total mineral powder mixing amount is 5 percent, and about 22.5kg of the asphalt concrete recovery powder is produced by each ton of the asphalt concrete produced by the machine-made sand. The production of the small asphalt concrete is calculated according to 60 ten thousand tons of asphalt concrete every year, 13500 tons of solid waste asphalt concrete recovery powder is produced every year, and in addition, because the solid waste asphalt concrete recovery powder is dust, the main reason that the recycled asphalt concrete powder cannot be completely used for replacing mineral powder due to serious pollution to ecological environment and the requirement of the recycled asphalt concrete powder according to relevant standard is that the content of the mud powder in the recycled asphalt concrete powder seriously affects the product quality, and at present, no relevant standard or method exists for detecting the test method of the content of the mud powder in the recycled asphalt concrete powder, such as the method can quantitatively determine the content of the mud powder in the recycled asphalt concrete powder, the cement can be used according to different mixing proportions of different mud powder contents or used in cement concrete products, the ecological environment is protected, and the using amount of mineral powder and other admixtures is saved, so that the aims of recycling solid waste, reducing cost and improving efficiency are fulfilled.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for measuring the mud content of asphalt concrete recycled powder, so as to solve the problem that the mud content in the asphalt concrete recycled powder is not measured in the prior art.
In order to solve the technical problems, the technical scheme of the invention is as follows: a method for measuring the mud content of asphalt concrete recycled powder comprises the following steps:
step one, preparing stone powder with zero mud content by a test mill after cleaning and drying or naturally drying the same sandstone aggregate for producing asphalt concrete, and reserving a sample for later use after screening by a screen;
selecting a similar or same soil sample around a sandstone raw material mine, drying, manually or mechanically manufacturing mud powder, and screening by using a screen to obtain a sample with the mud powder content of 100% for later use;
preparing fixed values of mixed powder with different mud powder contents according to a known proportion, putting the fixed values into a 1000ml beaker, adding 500ml of distilled water or deionized water to perform a methylene blue test, measuring the corresponding methylene blue MB values of the different mud powder contents, and preparing a standard curve for later use through linear fitting;
and (IV) measuring the methylene blue MB value of the recycled asphalt powder according to the method in the step (III), performing back-pushing according to a standard curve or a linear fitting formula, and quantitatively analyzing the content of the mud powder in the recycled asphalt powder.
Preferably, in the step (one), the aperture of the screen is 0.15mm, and the specific operation method is as follows: sieving the fine powder ground by the test mill through a screen with the aperture of 0.15mm, sieving to remove the part of the powder above the screen mesh, and taking the fine powder below the screen mesh for standby.
Preferably, in the step (two), the aperture of the screen is 0.075mm, and the specific operation method is as follows: sieving the artificially or mechanically processed mud powder with a screen with aperture of 0.075mm to remove the powder above the screen mesh, and collecting the fine powder below the screen mesh for use.
Preferably, in the step (three), the fixed value weight is 50-200g, and the prepared mud powder content is prepared according to 0%, 1%, 2%, 3%, 4%, 5%, 10% and 20%.
Compared with the prior art, the invention has the beneficial effects that:
the method for measuring the mud content of the recycled asphalt concrete powder adopts known mud powder contents with different proportions to measure the methylene blue MB value of the recycled asphalt concrete powder to prepare a standard curve, and the mud powder content of the recycled asphalt concrete powder is reversely deduced according to the methylene blue MB value of the recycled asphalt concrete powder to be measured. The method can rapidly, conveniently and quantitatively analyze the content of the mud powder in the recycled asphalt concrete powder, and has simple operation method and accurate result.
The method can guide production according to the measurement result, adjust the blending proportion of recycling the recycled asphalt concrete powder in real time, and fill the blank of quantitative analysis of the content of mud powder in the existing stone powder.
Drawings
FIG. 1 is a standard curve diagram of different contents of mud powder in the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The invention relates to a method for measuring the mud content of asphalt concrete recycled powder, which comprises the following steps:
step one, preparing stone powder with zero mud content by a test mill after cleaning and drying or naturally drying the same sandstone aggregate for producing asphalt concrete, and reserving a sample for later use after screening by a screen; the aperture of the screen is 0.15mm, and the specific operation method comprises the following steps: sieving the fine powder ground by the test mill through a screen with the aperture of 0.15mm, sieving to remove the part of the powder above the mesh of the screen, and taking the fine powder below the screen for standby;
selecting a similar or same soil sample around a sandstone raw material mine, drying, manually or mechanically manufacturing mud powder, and screening by using a screen to obtain a sample with the mud powder content of 100% for later use; the aperture of the screen is 0.075mm, and the specific operation method comprises the following steps: sieving the artificially or mechanically produced mud powder through a screen with the aperture of 0.075mm, removing the powder above the screen mesh, and taking the fine powder below the screen mesh for later use;
preparing fixed values of mixed powder with different mud powder contents according to a known proportion, putting the fixed values into a 1000ml beaker, adding 500ml of distilled water or deionized water to perform a methylene blue test, measuring the corresponding methylene blue MB values of the different mud powder contents, and preparing a standard curve for later use through linear fitting; the fixed value weight is 50-200g, and the content of the prepared mud powder is 0%, 1%, 2%, 3%, 4%, 5%, 10% and 20%; the standard curve is shown in figure 1 according to the configuration;
step four, measuring the methylene blue MB value of the asphalt concrete recycled powder according to the method in the step three, performing back-pushing according to a standard curve or a linear fitting formula, and quantitatively analyzing the content of mud powder in the asphalt recycled powder; the method is configured by the method, and is combined with a GB/T14684-2011 method for measuring the content of the stone powder and the MB value, and the standard curve diagram of the MB value of methylene blue and the content of the mud powder when the percentage content of the mud powder is different is combined, so that the following table 1 is obtained:
table of results of measuring different mud powder contents in methylene blue MB value
With reference to fig. 1 and table 1, the known mud powder content at different proportions can be used to determine the methylene blue MB value thereof to make a standard curve, and the mud powder content can be inverted according to the recycled asphalt concrete powder methylene blue MB value to be measured. The method can rapidly, conveniently and quantitatively analyze the content of the mud powder in the recycled asphalt concrete powder, and has simple operation method and accurate result. The method can guide production according to the measurement result, adjust the blending proportion of recycling the recycled asphalt concrete powder in real time, and fill the blank of quantitative analysis of the content of mud powder in the existing stone powder.
The method is also suitable for a quantitative analysis method of the stone powder and the mud powder in the machine-made sand, and fills the blank that only qualitative analysis can be carried out but not quantitative analysis can be carried out in the current relevant standards.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, and the scope of protection is still within the scope of the invention.
Claims (4)
1. The method for measuring the mud content of the recycled asphalt concrete powder is characterized by comprising the following steps of:
step one, preparing stone powder with zero mud content by a test mill after cleaning and drying or naturally drying the same sandstone aggregate for producing asphalt concrete, and reserving a sample for later use after screening by a screen;
selecting a similar or same soil sample around a sandstone raw material mine, drying, manually or mechanically manufacturing mud powder, and screening by using a screen to obtain a sample with the mud powder content of 100% for later use;
preparing fixed values of mixed powder with different mud powder contents according to a known proportion, putting the fixed values into a 1000ml beaker, adding 500ml of distilled water or deionized water to perform a methylene blue test, measuring the corresponding methylene blue MB values of the different mud powder contents, and preparing a standard curve for later use through linear fitting;
and (IV) measuring the methylene blue MB value of the recycled asphalt powder according to the method in the step (III), performing back-pushing according to a standard curve or a linear fitting formula, and quantitatively analyzing the content of the mud powder in the recycled asphalt powder.
2. The method for measuring the mud content of the asphalt concrete reclaimed powder according to claim 1, characterized in that: in the step (one), the aperture of the screen is 0.15mm, and the specific operation method is as follows: sieving the fine powder ground by the test mill through a screen with the aperture of 0.15mm, sieving to remove the part of the powder above the screen mesh, and taking the fine powder below the screen mesh for standby.
3. The method for measuring the mud content of the asphalt concrete reclaimed powder according to claim 1, characterized in that: in the step (two), the aperture of the screen is 0.075mm, and the specific operation method is as follows: sieving the artificially or mechanically processed mud powder with a screen with aperture of 0.075mm to remove the powder above the screen mesh, and collecting the fine powder below the screen mesh for use.
4. The method for measuring the mud content of the asphalt concrete reclaimed powder according to claim 1, characterized in that: in the step (III), the fixed value weighs 50-200g, and the prepared mud powder content is prepared according to 0%, 1%, 2%, 3%, 4%, 5%, 10% and 20%.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113686745A (en) * | 2021-09-17 | 2021-11-23 | 新疆西建科研检测有限责任公司 | Method for detecting mud content in sand |
| CN113848185A (en) * | 2021-09-30 | 2021-12-28 | 中建西部建设建材科学研究院有限公司 | Sand MB value testing system and method |
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Application publication date: 20210611 |