CN112748079A - Method for measuring mud content of natural sand for building - Google Patents
Method for measuring mud content of natural sand for building Download PDFInfo
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- CN112748079A CN112748079A CN202011535549.2A CN202011535549A CN112748079A CN 112748079 A CN112748079 A CN 112748079A CN 202011535549 A CN202011535549 A CN 202011535549A CN 112748079 A CN112748079 A CN 112748079A
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- 239000004576 sand Substances 0.000 title claims abstract description 95
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000005406 washing Methods 0.000 claims abstract description 56
- 238000002835 absorbance Methods 0.000 claims abstract description 39
- 239000007788 liquid Substances 0.000 claims abstract description 39
- 238000005303 weighing Methods 0.000 claims abstract description 9
- 238000010276 construction Methods 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 238000012937 correction Methods 0.000 claims description 9
- 239000000126 substance Substances 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 7
- 239000011521 glass Substances 0.000 claims description 3
- 238000012886 linear function Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 5
- 238000012360 testing method Methods 0.000 abstract description 5
- 239000000523 sample Substances 0.000 description 9
- 238000005259 measurement Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 2
- RBTBFTRPCNLSDE-UHFFFAOYSA-N 3,7-bis(dimethylamino)phenothiazin-5-ium Chemical compound C1=CC(N(C)C)=CC2=[S+]C3=CC(N(C)C)=CC=C3N=C21 RBTBFTRPCNLSDE-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229960000907 methylthioninium chloride Drugs 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
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Abstract
The invention discloses a method for measuring the mud content of natural sand for construction, which comprises the following steps: (1) weighing n groups of natural sand standard products, and preparing n groups of standard natural sand washing liquid; (2) determining the washing liquid absorbance of n groups of natural sand with standard mud content to prepare a mud content absorbance standard curve; (3) obtaining a curve calibration model through function fitting, and establishing a calibration model of a mud content absorbance standard curve; (4) and (3) obtaining the mud content of the natural sand sample by testing the absorbance of the washing liquid of the natural sand sample and calculating according to a calibration model of a mud content absorbance standard curve. The method can simplify the testing process, quickly and accurately measure the mud content of the natural sand, and reduce human factor errors by correcting the model.
Description
Technical Field
The invention relates to a method for measuring the mud content of natural sand for construction.
Background
According to the national standard GB/T14684 building sand of the people's republic of China, at present, the building sand is mainly divided into natural sand and machine-made sand, the mud content of the natural sand is characterized by measuring the mass difference of samples before and after washing, and the machine-made sand is characterized by measuring an MB value through a methylene blue solution. The quality method is manually operated, the steps of washing, drying, weighing and the like are needed for many times when the mud content of the natural sand is measured, the method is complicated, the consumed time is long, and the automatic and instrumented rapid measurement is difficult to realize; the MB value method is also very complicated to measure the mud content of the machine-made sand, consumes time, has large judgment error through human eye titration end points, has low accuracy and is difficult to realize automatic rapid measurement. The invention has the following patents: an automatic device and a method (201810313381.7) for measuring the mud content of raw sand based on a constant volume method are provided to solve the problems of complicated steps and long time consumption of the existing method for measuring the mud content of the raw sand, a water level probe is utilized to control the distance between the water level in a sand washing cup and the bottom of the sand washing cup to be 125mm, on the basis of meeting the same water level, a pressure sensor is utilized to respectively measure the mass when clean water is filled in the sand washing cup, the mass when a mixture of sand and water which are not washed away by mud is filled in the sand washing cup and the mass when the mixture of sand and water which are washed away by mud is filled in the sand washing cup, a formula is utilized to derive the relation between the three masses and the mud content, and finally an expression of the mud content is obtained, namely the mud content is measured, and the method aims at the mud content of the casting raw sand, the mud content of machine-made sand cannot be measured, and the sand is not dried in the measuring process, measurement errors are easily generated. The invention has the following patents: (201922124586.3) discloses a sand mud content detection device for building mortar, which can obtain the sand mud content after calculation by weighing the mass change of sand particles before and after cleaning, cannot determine the mud content of machine-made sand, and easily generates measurement errors because the sand is not dried in the process of determining the mass.
The present invention has been made in view of the above-mentioned problems.
Disclosure of Invention
Aiming at the defects of the conventional method for measuring the building sand, the invention aims to provide a method for quickly and accurately measuring the mud content of the building natural sand, and the implementation scheme of automatic equipment is convenient to put forward on the basis of the method.
The technical scheme adopted by the invention for solving the technical problem is as follows:
a method for measuring the mud content of natural sand for construction comprises the following steps:
(1) preparing a standard mud content natural sand washing liquid,
weighing n groups of natural sand standard substances, wherein n is more than or equal to 3, the mass of each group of standard substances is A, and the mud content of each group of natural sand is X1，X2，……，XnEach groupWashing the standard substance with clean water with the volume of B, filtering after washing, collecting all washing liquid, and preparing n groups of standard natural sand washing liquid;
(2) a standard curve of the mud content absorbance is made,
respectively putting n groups of standard natural sand washing liquid into transparent colorimetric tanks, injecting a beam of visible light with the light intensity of C into one side of each colorimetric tank, measuring the light transmission intensity of the natural sand washing liquid with different mud contents on the other side by using a brightness meter, calculating the absorbance of each group of standard natural sand washing liquid, and making a standard curve by using a dotting method by using the mud contents as abscissa and the absorbance as ordinate;
(3) correcting the standard curve in the step (2), establishing a correction model of the mud content absorbance standard curve,
fitting a mathematical relation between the absorbance and the mud content by using a linear function, namely setting a relation function of the mud content X and the absorbance Y as F (X, Y), and regression variables as m and b, wherein the mud content of any group of standard products is Xi, i is 1, 2, … …, n, and the corresponding absorbance is Yi, and then the curve correction model is as follows:
Y＝F(X,Y)＝mX+b
wherein
(4) Determination of mud content of unknown natural sand
Weighing a natural sand sample with the mass of A, washing with clear water with the volume of B, filtering after washing, collecting all washing liquids, placing the collected washing liquids in a transparent colorimetric tank, emitting a visible light beam with the light intensity of C into one side of each colorimetric tank, measuring the light transmission intensity of the natural sand washing liquids with different mud contents by using a brightness meter on the other side, calculating the absorbance of the natural sand sample washing liquid, substituting the absorbance into a correction model of a mud content absorbance standard curve, and calculating the mud content of the sample.
In a preferred aspect of the present invention, the value of n satisfies the following expression: n is more than or equal to 5.
Optionally, the luminance meter is a calorimetric luminance meter, a spectroradiometric luminance meter, or a responsive color luminance meter.
In a preferred embodiment of the present invention, in step (1), the natural sand is washed and then filtered through a 75 μm double-layer sieve.
In a preferred embodiment of the present invention, A has a value of 10g to 10000 g.
In a preferred embodiment of the present invention, the value of B is 10mL to 15000 mL.
In a preferred embodiment of the invention, the clean water with the volume B has a mass of 0.8A-2A.
In a preferred embodiment of the present invention, the cuvette is a glass cuvette.
The invention has the beneficial effects that: according to the invention, a mud content absorbance standard curve is formed by measuring the washing liquid absorbance of the natural sand with a series of standard mud contents, a curve calibration model is obtained by function fitting, and the mud content of the natural sand sample is obtained by testing the absorbance of the natural sand washing liquid of the sample and calculating according to the calibration model of the mud content absorbance standard curve. The method can simplify the testing process, quickly and accurately measure the mud content of the natural sand, reduce human factor errors by correcting the model, and research and develop related automatic quick measuring equipment on the basis of the method.
Drawings
FIG. 1 is a schematic view of the process for measuring the content of sludge in natural sand according to the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly. In addition, the descriptions related to "preferred", "less preferred", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "preferred" or "less preferred" may explicitly or implicitly include at least one such feature.
Example 1
The embodiment provides a method for measuring the mud content of natural sand for construction, which comprises the following steps:
(1) preparing a standard mud content natural sand washing liquid,
weighing 16 groups of standard natural sand, wherein the mass of each group of standard natural sand is 250g, the mud content of each group of natural sand is 0, 0.2%, 0.4%, 0.6%, 0.8%, 1%, 1.5%, 2.0%, 2.5%, 3.0%, 3.5%, 4.0%, 4.5%, 5.0%, 6% and 10%, each group of standard natural sand is washed by clean water with the volume of 300mL, filtering is carried out after washing is finished, all washing liquids are collected, and 16 groups of standard natural sand washing liquids are prepared.
(2) A standard curve of the mud content absorbance is made,
putting 16 sets of standard natural sand washing liquid into transparent colorimetric tanks respectively, for example glass colorimetric tank or transparent plastics colorimetric tank, a bundle of visible light with luminous intensity of C is penetrated into to one side of each colorimetric tank, and the light transmission intensity of the natural sand washing liquid with different mud content is determined to one side with the luminance meter, and the specific size of C is not limited as long as the visible light can pass through all the natural sand washing liquid. Calculating the absorbance of each group of standard natural sand washing liquid, and making a standard curve by using a point tracing method by taking the mud content as an abscissa and the absorbance as an ordinate;
(3) correcting the standard curve in the step (2), establishing a correction model of the mud content absorbance standard curve,
fitting a mathematical relation between the absorbance and the mud content by using a linear function, namely setting a relation function of the mud content X and the absorbance Y as F (X, Y) and regression variables as m and b, wherein the mud content of any group of standard products is Xi, i is 1, 2, … … and 16, and the corresponding absorbance is Yi, and then the curve correction model is as follows:
Y＝F(X,Y)＝mX+b
wherein
(4) Determination of mud content of unknown natural sand
Weighing a 250g natural sand sample, washing with 300ml clear water, filtering after washing, collecting all washing liquids, placing the collected washing liquids in a transparent colorimetric tank, injecting a visible light beam with the light intensity of C into one side of each colorimetric tank, namely, the light intensity is the same as that in the step (2), measuring the light transmission intensity of the natural sand washing liquids with different mud contents by using a brightness meter on the other side, calculating the absorbance of the natural sand sample washing liquid, substituting the absorbance into a correction model of a mud content absorbance standard curve, and calculating the mud content of the sample.
The luminance meter can be selected from a chromaticity luminance meter, a spectral radiance luminance meter or a response color luminance meter.
As a further improvement of the invention, in the step (1), the natural sand is filtered by a 75-micron double-layer sieve after being washed. The filtering is carried out by adopting a 75-micron double-layer sieve, particles smaller than 0.075mm can be fully discharged at the same time, so that the defect that the result is inaccurate due to the fact that sand grains are easy to run off according to the existing detection standard is overcome, and the defect that the result is inaccurate due to the fact that the particles smaller than 0.075mm cannot be fully washed off according to the existing detection standard is overcome.
In the step (1) and the step (4), the mass of each group of natural sand standard substance is not limited to 250g, and generally, the mass of the standard substance can be between 10g and 10000 g; the volume of the clear water used by each group of natural sand standard is not limited to 300mL, and generally, the volume of the clear water can be 10 mL-15000 mL.
Preferably, when the standard mud content natural sand washing liquid is prepared in the step (1), the mass of the adopted clean water in each group of tests is 0.8-2 times that of the natural sand standard product. By adopting the scheme, the natural sand standard substance can be completely immersed in water and fully washed, and meanwhile, the turbidity of the washing liquid can be ensured within a reasonable range, so that the precision of measuring the light transmission intensity of the washing liquid by using a brightness meter is improved.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which can be directly or indirectly applied to other related technical fields without departing from the spirit of the present invention, are intended to be included in the scope of the present invention.
Claims (8)
1. A method for measuring the mud content of natural sand for construction is characterized by comprising the following steps:
(1) preparing a standard mud content natural sand washing liquid,
weighing n groups of natural sand standard substances, wherein n is more than or equal to 3, the mass of each group of standard substances is A, and the mud content of each group of natural sand is X1，X2，……，XnWashing each group of standard products with clean water with the volume of B, filtering after washing, collecting all washing liquid, and preparing n groups of standard natural sand washing liquid;
(2) a standard curve of the mud content absorbance is made,
respectively putting n groups of standard natural sand washing liquid into transparent colorimetric tanks, emitting a beam of visible light with the light intensity of C to one side of each colorimetric tank, measuring the light transmission intensity of the natural sand washing liquid with different mud contents on the other side by using a brightness meter, calculating the absorbance of each group of standard natural sand washing liquid, and making a standard curve by using the mud contents as abscissa and the absorbance as ordinate;
(3) establishing a correction model of a mud content absorbance standard curve,
fitting a mathematical relation between the absorbance and the mud content by using a linear function, namely setting a relation function of the mud content X and the absorbance Y as F (X, Y), regression variables as m and b, wherein the mud content of any group of standard products is Xi, the corresponding absorbance is Yi, and then the curve correction model is as follows:
Y＝F(X,Y)＝mX+b
wherein
(4) Determination of mud content of unknown natural sand
Weighing a natural sand sample with the mass of A, washing with clear water with the volume of B, filtering after washing, collecting all washing liquids, placing the collected washing liquids in a transparent colorimetric tank, emitting a visible light beam with the light intensity of C into one side of each colorimetric tank, measuring the light transmission intensity of the natural sand washing liquids with different mud contents by using a brightness meter on the other side, calculating the absorbance of the natural sand sample washing liquid, substituting the absorbance into a correction model of a mud content absorbance standard curve, and calculating the mud content of the sample.
2. The method for measuring the mud content of the natural sand for buildings according to claim 1, wherein the value of n satisfies the following expression: n is more than or equal to 5.
3. The method of claim 1, wherein the luminance meter is a calorimetric luminance meter, a spectroradiometric luminance meter, or a responsive color luminance meter.
4. The method for measuring the mud content of the natural sand for construction according to claim 1, wherein in the step (1), the natural sand is filtered by a 75-micron double-layer sieve after being washed.
5. The method for measuring the mud content of the natural sand for construction according to claim 1, wherein the value of A is 10g to 10000 g.
6. The method for measuring the mud content of the natural sand for buildings according to claim 5, wherein the value of B is 10mL to 15000 mL.
7. The method for measuring the mud content of the natural sand for buildings according to claim 1, 5 or 6, wherein the clear water with the volume B has the mass of 0.8A-2A.
8. The method as claimed in claim 1, wherein the colorimetric tank is a glass colorimetric tank.
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| CN202011535549.2A CN112748079A (en) | 2020-12-23 | 2020-12-23 | Method for measuring mud content of natural sand for building |
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| CN202011535549.2A CN112748079A (en) | 2020-12-23 | 2020-12-23 | Method for measuring mud content of natural sand for building |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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| CN111751305A (en) * | 2020-06-12 | 2020-10-09 | 安徽省（水利部淮河水利委员会）水利科学研究院（安徽省水利工程质量检测中心站） | Method for measuring contents of cement and mineral powder in hardened concrete |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN113848185B (en) * | 2021-09-30 | 2024-03-01 | 中建西部建设建材科学研究院有限公司 | Sand MB value test system and method |
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