CN109001159B - Device and method for rapidly measuring solid content of liquid water reducing agent - Google Patents

Device and method for rapidly measuring solid content of liquid water reducing agent Download PDF

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Publication number
CN109001159B
CN109001159B CN201810765005.1A CN201810765005A CN109001159B CN 109001159 B CN109001159 B CN 109001159B CN 201810765005 A CN201810765005 A CN 201810765005A CN 109001159 B CN109001159 B CN 109001159B
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solid content
liquid water
container
base
box body
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CN109001159A (en
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周芬
张超灿
马双平
朱华雄
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Wuhan Super New Building Materials Co ltd
Wuhan University of Technology WUT
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Wuhan Super New Building Materials Co ltd
Wuhan University of Technology WUT
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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
    • G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length

Abstract

The invention discloses a device and a method for rapidly measuring the solid content of a liquid water reducing agent, wherein the device comprises a shading box body, a base, a container, a laser light source, an incident angle detection unit, an emergent light detection unit, a single chip microcomputer and a display unit; the base is arranged in the shading box body, and a limit groove matched with the container and a sliding groove surrounding the limit groove are arranged on the base; the container is arranged in the limiting groove; a light source base which can slide along the sliding groove is arranged in the sliding groove; the laser light source is fixed on the light source base; the incident angle detection unit mainly comprises an angle sensor and a knob and is mainly used for acquiring the incident angle of the laser; the outgoing light detection unit mainly includes a photodiode for detecting the direction of the outgoing light. The device has a principle structure, and can quickly detect the relative refractive index of the liquid water reducing agent; the method can also quickly obtain the solid content of the liquid water reducing agent, the error rate is not higher than 1.5 percent, and the real-time production control requirement of the liquid water reducing agent can be met.

Description

Device and method for rapidly measuring solid content of liquid water reducing agent
Technical Field
The invention belongs to the technical field of water reducing agent detection, and particularly relates to a device and a method for rapidly measuring solid content of a liquid water reducing agent.
Background
The solid content is an important index of the liquid water reducing agent, and has important influence on the stability of the liquid water reducing agent. The solid content can be accurately and rapidly determined, and the production control of the liquid water reducing agent is facilitated. At present, a gravimetric method is commonly adopted to detect the solid content of the liquid water reducing agent. The weight method comprises the following steps: drying the liquid water reducing agent to constant weight at the temperature of 100-105 ℃, weighing, wherein the constant weight is the total solid content, and calculating the solid content according to the total solid content. But the gravimetric method has the advantages of long detection period and complex operation, and is suitable for detecting products with less product batches and arbitration requirements; but is not suitable for the real-time production control of factories with large production scale and more sample batches.
Disclosure of Invention
The invention aims to provide a device and a method for rapidly measuring the solid content of a liquid water reducing agent, which are particularly suitable for real-time production control of a polycarboxylic acid liquid water reducing agent.
The invention provides a device for rapidly measuring the solid content of a liquid water reducing agent, which comprises a shading box body, a circular base, a semicircular container, a laser light source, an incident angle detection unit, an emergent light detection unit, a single chip microcomputer and a display unit, wherein the circular base is arranged on the shading box body;
the base is arranged in the shading box body and at the bottom of the shading box body, a limit groove matched with the container and a semicircular sliding groove surrounding the limit groove are arranged on the base, and the base, the limit groove and the sliding groove are concentric; the container is arranged in the limiting groove, and the plane side wall and the curved side wall of the container are both made of light-transmitting glass; a light source base which can slide along the sliding groove is arranged in the sliding groove; the laser light source is used for emitting a single laser beam, the laser light source is fixed on the light source base, and emergent light is aligned to the center of the base;
the incident angle detection unit comprises an angle sensor, a knob, a transverse shaft and a vertical shaft, wherein the knob is arranged at the top end outside the shading box body, and the center of the knob is positioned above the circle center of the base; the angle sensor is fixed at the top end in the shading box body, and the center of the angle sensor is just below the center of the knob; the angle sensor, the knob and one end of the transverse shaft are connected, the other end of the transverse shaft is connected with the vertical shaft, and the bottom end of the vertical shaft is connected with the light source base;
the emergent light detection unit comprises a photosensitive diode, an LED lamp and a power supply; an even number of photosensitive diodes are arranged at the edge of the base corresponding to the emergent range of the emergent light, and the photosensitive diodes are distributed at two sides of the normal of the plane side wall of the container; each photosensitive diode is respectively connected with an LED lamp in series, and the power supply is used for supplying power to the series circuit of each photosensitive diode;
the output end of the angle sensor is connected with the single chip microcomputer, and the output end of the single chip microcomputer is connected with the display unit.
Preferably, the limiting groove is internally provided with at least two positioning bulges, the bottom of the container is provided with positioning holes corresponding to the positioning bulges, and when the container is arranged in the limiting groove, the positioning bulges are correspondingly jacked into the positioning holes.
Preferably, a semicircular positioning convex rib is arranged in the limiting groove, a semicircular positioning groove corresponding to the positioning convex rib is arranged at the bottom of the container, and when the container is arranged in the limiting groove, the positioning convex rib is correspondingly jacked into the positioning groove.
Preferably, one end of the cross shaft, which is connected with the angle sensor and the knob, is provided with a T-shaped end, one end of the T-shaped end is connected with a rotating shaft of the angle sensor through a coupler, and the other end of the T-shaped end is directly connected with the knob.
Preferably, the transverse shaft is arranged in the shading box body and arranged along the top end in the shading box body; the vertical shaft is also arranged in the shading box body and arranged along the inner side wall of the shading box body.
Preferably, a fixing piece is arranged on the base corresponding to the emergent range of the emergent light, and each photosensitive diode is arranged on the fixing piece.
Preferably, each of the LED lamps and the display unit are disposed on the upper surface of the light-shielding box.
The use method of the device for rapidly measuring the solid content of the liquid water reducer, provided by the invention, comprises the following steps:
marking the state of the angle sensor as zero when the laser light source is positioned on the normal line of the side wall of the container plane;
starting from a zero position, rotating the knob clockwise or anticlockwise, recording an angle value output by the display unit at the moment when an LED lamp is on, namely a current incident angle, wherein an emergent angle corresponding to the incident angle is obtained according to the position of a photosensitive diode connected in series with the LED lamp which is on;
returning to the zero position, starting from the zero position, rotating the knob anticlockwise or clockwise, and recording an angle value output by the display unit at the moment when the LED lamp is on, namely the current incident angle, wherein the emergent angle corresponding to the incident angle is obtained according to the position of a photosensitive diode connected in series with the LED lamp which is on;
based on the refraction principle, the relative refractive indexes are respectively calculated according to the recorded incident angles and the corresponding emergent angles
Figure BDA0001728825510000021
Averaging the relative refractive indexes; wherein, a is an incident angle, and b is an emergent angle corresponding to the incident angle a.
The method for rapidly measuring the solid content of the liquid water reducing agent provided by the invention is carried out by adopting the device for rapidly measuring the solid content of the liquid water reducing agent, and comprises the following steps:
taking a series of samples of liquid water reducing agents with different solid contents, determining the solid contents by adopting a gravimetric method, and determining the relative refractive index by adopting the device for rapidly measuring the solid contents of the liquid water reducing agents and the using method;
secondly, fitting a numerical relation curve of the solid content and the relative refractive index according to the data of the solid content and the relative refractive index obtained in the first step;
and thirdly, for a liquid water reducing agent sample to be detected, determining the relative refractive index of the liquid water reducing agent sample to be detected by adopting the device for rapidly measuring the solid content of the liquid water reducing agent and the using method, and obtaining the solid content of the liquid water reducing agent sample to be detected according to a numerical relation curve of the solid content and the relative refractive index.
Before the invention, the applicant finds that the solid content and the refractive index of the liquid water reducing agent have a numerical value corresponding relation through a large number of experiments, and verifies that the error rate of the solid content measured by using the refractive index is not higher than 1%.
The test procedure was as follows:
firstly, a series of samples of the polycarboxylic acid liquid water reducing agent with known solid content are taken, and the solid content and the refractive index are respectively measured by a liquid refractive index instrument.
And then, fitting a numerical relation curve of the solid content and the refractive index according to the obtained solid content and refractive index data.
And finally, taking a series of polycarboxylic acid liquid water reducing agent test samples with known solid contents, measuring the refractive index, and obtaining the solid contents of the test samples based on a numerical relation curve of the solid contents and the refractive index.
The known solid content of the test sample and the solid content obtained based on the refractive index method are shown in table 1, and it can be seen from table 1 that the accurate solid content of the polycarboxylic acid liquid water reducing agent can be obtained by the refractive index method. Wherein the error rate is a percentage of the known solid content and the difference between the known solid content and the solid content obtained based on the refractive index method.
TABLE 1 comparative table of solid content
Test sample number 1 2 3 4 5 6 7 8
Known solid content (%) 18.5 18.69 18.68 18.44 18.56 18.49 18.62 17.98
Content of solid (%) 18.52 18.87 18.71 18.62 18.70 18.59 18.55 17.88
Error rate (%) 0.11 0.96 0.16 0.98 0.75 0.54 0.38 0.56
Based on the test results, it can be known that the determination of the solid content of the liquid water reducing agent by using the refractive index is completely feasible.
However, most of liquid refractive index instruments on the market are complicated to use and high in price, are difficult to rapidly measure the solid content of the liquid water reducing agent, and cannot be suitable for real-time production control of the liquid water reducing agent.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) the device disclosed by the invention has a principle structure and a simple structure, and can be used for quickly detecting the relative refractive index of the liquid water reducing agent.
(2) The method can quickly obtain the solid content of the liquid water reducing agent by utilizing the relative refractive index of the liquid water reducing agent by utilizing the numerical value corresponding relation existing between the solid content and the relative refractive index of the liquid water reducing agent.
(3) Tests prove that the method can accurately measure the solid content, and the error rate is not higher than 1.5%.
Drawings
FIG. 1 is a schematic view of the appearance of the apparatus of the present invention;
FIG. 2 is a top view of a base according to example 1, wherein (a) is a top view of the base without a container placed thereon, and (b) is a top view of the base with a container placed thereon;
FIG. 3 is a schematic diagram showing the explosion of the incident angle detecting unit in example 1;
FIG. 4 is a schematic block diagram of a circuit of an outgoing light detection unit in embodiment 1;
fig. 5 is a schematic diagram of the principle of the present invention.
In the figure:
100-a light-shielding box body;
200-base, 210-spacing groove, 220-sliding groove, 230-light source base;
300-a container;
400-a laser light source;
510-angle sensor, 511-rotating shaft, 520-knob, 530-horizontal shaft, 531-T-shaped end, 540-vertical shaft and 550-coupler;
610 a-first photodiode, 610 b-second photodiode, 620 a-first LED light, 620 b-second LED light, 630-fixture;
700-display unit.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments and the accompanying drawings, and it is to be understood that the described embodiments are merely a part of the embodiments of the present invention, and not all of them. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is to be noted that the drawings are provided for illustrative purposes only and that the dimensional proportions shown in the drawings are not to scale.
Example 1
Referring to fig. 1 to 4, the device of the present embodiment mainly includes a cylindrical light-shielding box 100, a circular base 200, a semicircular container 300, a laser light source 400, an incident angle detection unit, an emergent light detection unit, a single chip microcomputer, and a display unit 700. The side of the light-shielding box 100 is provided with a side door (not shown in the figures) for conveniently taking and placing the container 300, the base 200 is fixed at the bottom of the light-shielding box 100, the container 300 is arranged on the base 200, and the plane side wall and the curved side wall of the container 300 are both made of transparent glass. The laser light source 400 is used to emit a single laser beam, the incident angle detection unit is used to obtain the incident angle of the laser, and the emergent light detection unit is used to detect the direction of the incident light using a photodiode.
Referring to fig. 2, the base 200 is provided with a limit groove 210 matching the container 300 and a semicircular slide groove 220 surrounding the limit groove 210, and the base 200, the limit groove 210 and the slide groove 220 are concentric. The position-limiting groove 210 is used for placing the container 300 and limiting the position of the container 300. The light source base 230 capable of sliding along the sliding groove 220 is arranged in the sliding groove 220, the laser light source 400 is fixed on the light source base 230, and emergent light is aligned to the center of the base 200. In order to position the container 300, at least two positioning protrusions are arranged in the limiting groove 210, and positioning holes corresponding to the positioning protrusions are arranged at the bottom of the container 300. When the container 300 is placed, the positioning protrusions are correspondingly pushed into the positioning holes, and the container 300 can be positioned.
Referring to fig. 3, the incident angle detecting unit mainly includes an angle sensor 510 and a knob 520 connected to the angle sensor 510. The knob 520 is disposed at the top of the light-shielding box 100, and the center thereof is located above the center of the circle of the container 300, i.e. the center of the knob 520 is coaxial with the center of the circle of the container 300. The angle sensor 510 is fixed to the top end of the light-shielding case 100 for detecting the rotation angle of the knob 520. The angle sensor 510 and the knob 520 are connected to a horizontal shaft 530, the end of the horizontal shaft 530 is connected to a vertical shaft 540, and the bottom end of the vertical shaft 540 is connected to the light source base 230. More specifically, a T-shaped tip 531 is provided at one end of the horizontal shaft 530 connected to the angle sensor 510 and the knob 520. One end a of the T-shaped tip 531 is connected to the rotation shaft 511 of the angle sensor 510 via a coupling 550, and the other end b of the T-shaped tip 531 is directly connected to the knob 520. The cross shaft 530 is disposed inside the light-shielding box 100 and along the top end inside the light-shielding box 100; the vertical shaft 540 is also disposed in the light-shielding box 100 and along the inner sidewall of the light-shielding box 100. In this embodiment, the knob 520 is a knob with a limiting function, and can rotate clockwise and counterclockwise within a range of 0 to 90 degrees. The output end of the angle sensor 510 is connected to the single chip, the output of the single chip is connected to the display unit 700, in this embodiment, the single chip is disposed in the light-shielding box 100, and the display unit 700 is a display screen disposed on the upper surface of the light-shielding box 100 and is used for displaying the angle value output by the angle sensor 510, i.e., the incident angle of the laser. When the knob 520 is rotated, the horizontal shaft 530 and the vertical shaft 540 can be driven to rotate, so as to drive the light source base 230 to slide along the sliding groove 220, and the angle sensor 510 can output a rotation angle, so that a laser incident angle can be obtained according to the rotation angle.
Referring to fig. 4, the outgoing light detection unit includes a photodiode, an LED lamp, and a power supply. A plurality of photosensitive diodes are arranged at the edge of the base 200 corresponding to the emergent range of the emergent light, the number of the photosensitive diodes is preferably 2-4, and the photosensitive diodes are used for detecting the direction of the emergent light. In this embodiment, 2 photodiodes, which are respectively referred to as a first photodiode 610a and a second photodiode 610b, are arranged, each photodiode is respectively connected in series with an LED lamp, which is respectively referred to as a first LED lamp 620a and a second LED lamp 620b, and a power supply is used for supplying power to a series circuit of each photodiode. When light irradiates the photosensitive diode, the LED lamps connected in series are on. Since the position of the photodiode is known, the exit angle of the exit light it detects is known. In this embodiment, as shown in fig. 2, a fixing member 630 is disposed on the base 200 corresponding to the emitting range of the emitted light, the first photodiode 610a and the second photodiode 610b are disposed on the fixing member 630, and the first LED lamp 620a and the second LED lamp 620b respectively connected to the first photodiode 610a and the second photodiode 610b are disposed on the upper surface of the light-shielding box 100.
In this embodiment, the laser source 400 is an LD laser source capable of emitting a single laser beam, such as a HA3405150D-AL laser source. The angle sensor 510 is model LW126C, and can directly output the angle value of the digital signal.
The principle of the present invention will be explained below with reference to the present embodiment.
Referring to fig. 5, before use, the emergent light direction of the laser source 400 is adjusted to make the emergent light aim at the center O of the container 300, so that when the laser source 400 is driven by the knob 520 to make a circular motion around the center O, the emergent light always keeps aiming at the center O, i.e. the emergent light always keeps vertically incident from the arc ACB to the center O. The position where laser light source 400 is located on the OC extension line is marked as the null of angle sensor 510. Starting from the null position, the laser light source 400 is rotated clockwise or counterclockwise by the angle of incidence of the laser light. The first photodiode 610a and the second photodiode 610b arranged in this embodiment are distributed on two sides of the normal of the AB plane; the corresponding exit angles of the first photodiode 610a and the second photodiode 610b are denoted as b1 and b2, respectively.
The sample to be tested is placed in the container 300, and the container 300 is placed in the limiting groove 210. Starting from the zero position, the knob 520 is rotated clockwise, and when the first LED lamp 620a is turned on, the angle value output by the display unit 700, i.e., the incident angle a1, is recorded; then returning to the zero position, the knob 520 is rotated counterclockwise, and when the second LED lamp 620b is turned on, the angle value outputted from the display unit 700, i.e., the incident angle a2, is recorded. Calculating relative refractive index based on refraction principle
Figure BDA0001728825510000061
And
Figure BDA0001728825510000062
n is to be01And n02And (6) averaging.
Example 2
This example is a preferred embodiment of example 1. The technical scheme is basically the same as that of the embodiment 1, but the following improvements are made based on the embodiment 1:
in order to further improve the positioning effect of the container 300, a semicircular positioning rib is arranged in the limiting groove 210, and meanwhile, a semicircular positioning groove corresponding to the positioning rib is arranged at the bottom of the container 300. When the container 300 is disposed in the limiting groove 210, the positioning ribs are correspondingly pushed into the positioning grooves.
Example 3
This embodiment will provide a specific process for determining the solid content of the liquid polycarboxylate superplasticizer by using the device.
In the first step, a series of samples of polycarboxylic acid liquid water reducing agents with different solid contents are taken, the solid content and the relative refractive index are respectively measured by a gravimetric method and the device, and the method for measuring the relative refractive index refers to example 1.
And secondly, fitting a numerical relation curve of the solid content and the relative refractive index according to the solid content of the sample and the measured relative refractive index data.
And thirdly, measuring the relative refractive index of the sample to be measured by adopting the device disclosed by the invention, and obtaining the solid content of the sample to be measured according to a numerical relation curve of the solid content and the relative refractive index.
TABLE 2 comparison of solid contents
Test sample number 1 2 3 4 5 6 7 8
Known solid content (%) 29.07 29.09 28.68 28.44 28.56 28.49 28.62 27.98
Content of solid (%) 28.81 28.83 28.39 28.74 28.28 28.19 28.90 27.65
Error rate (%) 0.88 0.90 0.99 1.06 0.95 1.04 0.98 1.16
To verify the accuracy of the method of the present invention, 8 test samples of polycarboxylic acid liquid water reducing agent with known solid content are taken, and the solid content is shown in the second row of table 2. The solid content of the 8 test samples was measured by the method of the present invention, and the solid content measurement results are shown in the third row of Table 2. By comparison, the error rate of the method is not higher than 1.5 percent and about 1 percent, and the accuracy can meet the real-time production control requirement of the polycarboxylic acid liquid water reducing agent.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims (8)

1. Device that rapid survey liquid water-reducing agent contains solid volume, characterized by:
the device comprises a shading box body, a round base, a semicircular container, a laser light source, an incident angle detection unit, an emergent light detection unit, a single chip microcomputer and a display unit;
the base is arranged in the shading box body and at the bottom of the shading box body, a limit groove matched with the container and a semicircular sliding groove surrounding the limit groove are arranged on the base, and the base, the limit groove and the sliding groove are concentric; the container is arranged in the limiting groove, and the plane side wall and the curved side wall of the container are both made of light-transmitting glass; a light source base which can slide along the sliding groove is arranged in the sliding groove; the laser light source is used for emitting a single laser beam, the laser light source is fixed on the light source base, and emergent light is aligned to the center of the base;
the incident angle detection unit comprises an angle sensor, a knob, a transverse shaft and a vertical shaft, wherein the knob is arranged at the top end outside the shading box body, and the center of the knob is positioned above the circle center of the base; the angle sensor is fixed at the top end in the shading box body, and the center of the angle sensor is just below the center of the knob; the angle sensor, the knob and one end of the transverse shaft are connected, the other end of the transverse shaft is connected with the vertical shaft, and the bottom end of the vertical shaft is connected with the light source base;
one end of the cross shaft, which is connected with the angle sensor and the knob, is provided with a T-shaped end, one end of the T-shaped end is connected with a rotating shaft of the angle sensor through a coupler, and the other end of the T-shaped end is directly connected with the knob;
the emergent light detection unit comprises a photosensitive diode, an LED lamp and a power supply; an even number of photosensitive diodes are arranged at the edge of the base corresponding to the emergent range of the emergent light, and the photosensitive diodes are distributed at two sides of the normal of the plane side wall of the container; each photosensitive diode is respectively connected with an LED lamp in series, and the power supply is used for supplying power to the series circuit of each photosensitive diode;
the output end of the angle sensor is connected with the single chip microcomputer, and the output end of the single chip microcomputer is connected with the display unit.
2. The device for rapidly measuring the solid content of the liquid water reducer as claimed in claim 1, which is characterized in that:
the limiting groove is internally provided with at least two positioning bulges, the bottom of the container is provided with a positioning hole corresponding to the positioning bulges, and when the container is arranged in the limiting groove, the positioning bulges are correspondingly jacked into the positioning hole.
3. The device for rapidly measuring the solid content of the liquid water reducer as claimed in claim 1, which is characterized in that:
the limiting groove is internally provided with a semicircular positioning convex edge, the bottom of the container is provided with a semicircular positioning groove corresponding to the positioning convex edge, and when the container is arranged in the limiting groove, the positioning convex edge is correspondingly jacked into the positioning groove.
4. The device for rapidly measuring the solid content of the liquid water reducer as claimed in claim 1, which is characterized in that:
the transverse shaft is arranged in the shading box body and is arranged along the top end in the shading box body; the vertical shaft is also arranged in the shading box body and arranged along the inner side wall of the shading box body.
5. The device for rapidly measuring the solid content of the liquid water reducer as claimed in claim 1, which is characterized in that:
a fixing piece is arranged on the base corresponding to the emergent range of the emergent light, and each photosensitive diode is arranged on the fixing piece.
6. The device for rapidly measuring the solid content of the liquid water reducer as claimed in claim 1, which is characterized in that:
each LED lamp with the display element all locates shading box body upper surface.
7. The method of using the apparatus of claim 1, comprising:
marking the state of the angle sensor as zero when the laser light source is positioned on the normal line of the side wall of the container plane;
starting from a zero position, rotating the knob clockwise or anticlockwise, recording an angle value output by the display unit at the moment when an LED lamp is on, namely a current incident angle, wherein an emergent angle corresponding to the incident angle is obtained according to the position of a photosensitive diode connected in series with the LED lamp which is on;
returning to the zero position, starting from the zero position, rotating the knob anticlockwise or clockwise, and recording an angle value output by the display unit at the moment when the LED lamp is on, namely the current incident angle, wherein the emergent angle corresponding to the incident angle is obtained according to the position of a photosensitive diode connected in series with the LED lamp which is on;
based on the refraction principle, the relative refractive indexes are respectively calculated according to the recorded incident angles and the corresponding emergent angles
Figure FDA0002324379610000021
Averaging the relative refractive indexes; wherein, a is an incident angle, and b is an emergent angle corresponding to the incident angle a.
8. A method for rapidly measuring the solid content of a liquid water reducing agent is characterized by comprising the following steps:
the method is carried out by using the device of claim 1, and comprises the following steps:
taking a series of samples of liquid water reducing agents with different solid contents, measuring the solid contents by adopting a gravimetric method, and measuring the relative refractive index by adopting the device of claim 1 and the method of claim 7;
secondly, fitting a numerical relation curve of the solid content and the relative refractive index according to the data of the solid content and the relative refractive index obtained in the first step;
and thirdly, measuring the relative refractive index of the liquid water reducer sample to be measured by adopting the device of claim 1 and the method of claim 7, and obtaining the solid content of the liquid water reducer sample to be measured according to a numerical relation curve of the solid content and the relative refractive index.
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