CN113533120A - Cement paste purification and granulation quantification method - Google Patents
Cement paste purification and granulation quantification method Download PDFInfo
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- CN113533120A CN113533120A CN202110714104.9A CN202110714104A CN113533120A CN 113533120 A CN113533120 A CN 113533120A CN 202110714104 A CN202110714104 A CN 202110714104A CN 113533120 A CN113533120 A CN 113533120A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention discloses a method for quantifying cement clean slurry granulation, which comprises the following steps of test preparation, hydration granulation of cement by adding water, granulation taking of cement granulation, drying and weighing, wherein the obtained weight is divided by the total weight of cement to obtain the agglomeration rate, and the agglomeration rate is used for representing the cement clean slurry granulation degree. The invention provides a clean slurry and agglomerate testing method based on combination of vibration screening and a water screen, and mainly aims to solve the problems that agglomerated particles are easy to damage in the existing water screen testing method, so that the testing is inaccurate, the operation is inconvenient, the accuracy is difficult to achieve and the like. The method provided by the invention can realize more convenient and accurate test results.
Description
Technical Field
The invention relates to the technical field of cement production, in particular to a method for quantifying cement paste and cement grains.
Background
The cement is one of the most important basic building materials for national economic construction, and the annual output of the cement in China currently exceeds 24 hundred million tons. The common portland cement is usually used in two ways, one is made of cement and sandstone aggregate into concrete, and the other is directly used as cement paste for wall building, brick laying, masonry and other construction, and the latter is usually called a slurry foaming method. During the use of the slurry foaming method, after the cement is made into a pure slurry by adding water, a plurality of 'pea-sand-shaped' agglomerated particles appear in the cement pure slurry, and the phenomenon is called as cement pure slurry agglomeration. The cement is cleaned and hardened to cause the deterioration of the cement caking property, and the cement cannot be stuck on walls and tiles, thereby bringing difficulty to cement construction. Therefore, the cement net slurry granulation is required to be monitored for part of cement enterprises, and the net slurry granulation quantity is required to be quantified.
At present, cement enterprises need to use a stirrer to stir cement according to the detection of indexes of the net slurry performance such as setting time, standard consistency water demand and the like by national standards, and the obtained net slurry cannot detect the net slurry granulation amount due to stirring damage. The national standard does not provide a regulation for a cement clean slurry granulation detection method, and only a quantitative method adopted by part of colleges and universities and enterprises is to perform clean slurry granulation and granulation extraction through a water sieving method. The method mainly utilizes the foundation that cement particles are not completely hydrated in a short time, the cement particles with the fineness smaller than the sieve diameter are flushed out of the sieve pores by the impulsive force of water, large-particle granular cement is left on the sieve, and the large-particle granular cement is taken out, dried and weighed to obtain the amount of the granules. The method comprises the following specific steps: placing cement into a flat-bottom small bowl as a hydration container, then spreading the cement by lightly vibrating for a certain number of times, discharging air in the cement, adding sufficient water into the small bowl, standing for 3-5min to ensure that the cement has enough time to be granulated, pouring cement paste into a square-hole sieve after standing, then flushing unfixed particles under certain water pressure, flushing the screened granular cement particles into containers such as a crucible and the like, and finally drying and weighing. The water screening method for the cement clean slurry granulation has limitations, which are mainly reflected in that:
1. the cement preparation process uses the hand vibration method to flatten cement and exhaust air, makes the cement granule contact inseparable, but the different testing personnel vibration dynamics of testing process are difficult to unify for cement granule contact degree is inconsistent, and granule contact degree diameter influences water granulation volume, therefore the water sieve method often appears different testing personnel and tests and the inconsistent phenomenon of test result.
2. The water sieving process requires the net cement slurry to be poured into a sieve net from a container for hydration, and the process can destroy the granulation state of the net cement slurry to a certain extent and is difficult to pour out.
3. Secondly, in the process of using the water screen, the pressure of water fluctuates, the water is washed from top to bottom, the water is difficult to be uniformly sprayed on the surface of cement to the falling point, so that non-agglomerated particles are washed out, the washing time is difficult to control, and the agglomerated particles are damaged in the washing process.
4. A plurality of steps in the test process are difficult to control by adopting a water screening method, the error influence factors of the test process on the test result are many, and the test is difficult to achieve accuracy.
Disclosure of Invention
The invention aims to: aiming at the limitation of the existing cement clean slurry nodule water sieve method, the clean slurry nodule testing method based on the combination of vibration screening and a water sieve is provided, and the main purpose is to solve the problems of inaccurate test, inconvenient operation, difficulty in achieving precision and the like caused by easy damage of agglomerated particles in the existing water sieve testing method. The method provided by the invention can realize more convenient and accurate test results.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:
a method for quantifying cement clean slurry and granulation comprises the following steps:
(1) preparation of the test: placing cement to be tested and test purified water in the same condition, standing for a period of time to ensure that the test conditions are consistent, then uniformly stirring the cement to be tested, weighing a certain weight of cement, placing the cement in a screen cloth wrapping a preservative film, placing the screen cloth on a vibration screening instrument with adjustable amplitude and time, covering a screen cover, vibrating the cement to discharge air in the cement, enabling the cement to be in close contact, and after vibration is finished, enabling the preservative film at the bottom of the screen cloth to keep a certain space with the bottom of the screen cloth;
(2) adding water into cement to hydrate and agglomerate: opening a vibrating screen cover plate, pouring the test pure water prepared in the step (1) into a screen along the edge of cement lightly, wherein the water addition amount needs to cover the surface of the cement completely and exceed the surface of the cement, and standing the cement in water to fully hydrate the cement;
(3) and (3) cement granulation and grain taking: after standing, adding a non-porous base to the screen, placing the screen on a vibration screening instrument, covering a vibration screen cover plate again, vibrating a mixture of water and cement, taking the screen down from the vibration screening instrument after vibration is finished, taking out a preservative film wrapping the screen, separating the water in the screen from the screen along with the preservative film, adding water from the bottom of the screen to clean the screen, simultaneously using a crucible on the front side of the screen to receive cleaning water and agglomerated particles, standing and clarifying the crucible, and draining the clear water to obtain the agglomerated particles;
(4) drying and weighing: and placing the crucible on a light wave furnace, baking until the water is completely evaporated to dryness to obtain the part of the aggregate in the poured cement paste, weighing the dried aggregate particles by using an electronic balance, and dividing the obtained weight by the total weight of the cement to obtain the agglomeration rate, wherein the agglomeration rate is used for representing the agglomeration degree of the cement paste.
Further, in the step (1), the standing condition is standing at 20 ℃ for 12 hours, the screen is a 250um square-hole screen, and the vibration is to vibrate the cement with an amplitude of 0.2mm for 1-2min by using a vibrating screen.
Further, in the step (2), the water addition amount is required to completely cover the cement surface and exceed the cement surface by at least 1cm, the height of water between the preservative film at the bottom of the screen and the screen is more than 2cm, and the standing time is 3-5 min.
Further, in the step (3), the vibration is to vibrate the water and the cement after adding the water by using a vibrating screen with the amplitude of 0.5-0.7mm, and the vibration time is 3-5 min.
Further, in the step (4), the baking temperature is 150-.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the invention uses the vibrating screen to carry out the compaction treatment on the sample at fixed frequency and fixed time, and compared with a hand vibration method, the method has more stable test conditions and more accurate test results.
2. The invention uses the vibrating screen to separate the agglomerated particles from the non-agglomerated particles in water, the low-frequency amplitude of the vibrating screen is not enough to damage the particle agglomeration, and the cement is dispersed more uniformly and fully in the water.
3. The vibrating screen can accurately adjust the amplitude and time, keeps the test consistency, avoids the subjective error of manual operation, and has more accurate and reliable test results.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to preferred embodiments. It should be noted, however, that the numerous details set forth in the description are merely for the purpose of providing the reader with a thorough understanding of one or more aspects of the present invention, which may be practiced without these specific details.
The pozzolana portland cement (P.P 32.5R) of different cement bases of the applicant is selected to be 6 samples in total, and each sample is 1kg and is respectively numbered from PP-1 to PP-6. And standing the cement and the purified water for the test at 20 ℃ for 12h to ensure the test condition consistency of 6 samples.
Example 1
Taking PP-1 cement, and sequentially carrying out the test process according to the following steps:
the outer side of a square-hole screen with the aperture of 250 mu m is completely wrapped with the bottom by using a polyethylene preservative film, and the preservative film is fixed on the screen by using 2 rubber bands and is tightly attached to the bottom of the screen.
And (3) fully and uniformly mixing 1kg of PP-1 cement serial number after standing, and weighing 50g by using an electronic balance. Pouring 50g of cement into the screen gently, placing the screen on an amplitude-adjustable and time-adjustable vibration screening instrument, covering a screen cover, vibrating the cement for 1min at an amplitude of 0.2mm by using a vibrating screen, discharging air in the cement, and flattening the cement in the screen.
The cover plate of the vibrating screen is opened, 1000ml of purified water with the water temperature of 20 ℃ is taken by a beaker, the edge of the beaker is attached to the edge of the screen, water is poured into the screen gently, the water is prevented from directly sprinkling on cement, the water needs to completely cover the surface of the cement and exceeds the surface of the cement by 2cm, a preservative film at the bottom of the screen naturally sinks after being added with water, a certain height is kept between the preservative film and the screen, and the height of the filled water is at least 3 cm. The cement was allowed to stand in water for 3min to hydrate.
And after standing, adding a non-porous base to the screen, putting the screen on a vibration screening instrument, covering a vibrating screen cover plate again, vibrating by using a vibrating screen with the amplitude of 0.7mm for 3min, so that cement which is not agglomerated in the cement flows into the screen bottom due to vibration dispersion, and agglomerated particles are remained on the screen. Taking the screen mesh down from the vibrating screen, taking out the preservative film wrapping the screen mesh, adding purified water at 20 ℃ from the bottom of the screen mesh to clean the screen mesh, using a crucible to receive cleaning water and agglomerated particles on the front surface of the screen mesh, ensuring that all the agglomerated particles flow into the crucible, standing the crucible for 3min for clarification, and draining the clean water to obtain the agglomerated particles.
Placing the crucible on a light wave furnace, adjusting the temperature to 250 ℃, baking until the water is completely evaporated, taking down the crucible by using a pliers, and cooling in air at 20 ℃ to obtain the part of the aggregate in the poured cement paste. And after the crucible is cooled to room temperature, weighing the dried agglomerated particles by using an electronic balance, and dividing the obtained weight by the added weight of 50g to obtain the neat paste agglomeration rate of the PP-1 cement.
PP-2 cement and PP-6 cement are tested according to the steps in sequence, and in order to verify the accuracy of the test method, two testers perform repeatability comparison tests. The test results of 6 cement samples taken are shown in table 1:
table 1: cement paste granulation test results
According to the analysis of the table 1, the method has high accuracy of the test result, and the test error among different testers is less than 5 percent, so that the test result is reliable, and the practicability of the method is verified.
Example 2
Taking PP-1 cement, and sequentially carrying out the test process according to the following steps:
the outer side of a square-hole screen with the aperture of 250 mu m is completely wrapped with the bottom by using a polyethylene preservative film, and the preservative film is fixed on the screen by using 2 rubber bands and is tightly attached to the bottom of the screen.
And (3) fully and uniformly mixing 1kg of PP-1 cement serial number after standing, and weighing 100g by using an electronic balance. Pouring 100g of cement lightly into the screen mesh, placing the screen mesh on a vibration screening instrument with adjustable amplitude and time, covering a screen cover, vibrating the cement for 0.8min by using a vibrating screen with the amplitude of 0.5mm, discharging air in the cement, and flattening the cement in the screen mesh.
The cover plate of the vibrating screen is opened, 1000ml of purified water with the water temperature of 20 ℃ is taken by a beaker, the edge of the beaker is attached to the edge of the screen, water is poured into the screen gently, the water is prevented from directly sprinkling on cement, the water needs to completely cover the surface of the cement and exceeds the surface of the cement by 1cm, a preservative film at the bottom of the screen naturally sinks after being added with water, a certain height is kept between the preservative film and the screen, and the height of the filled water is at least 2 cm. The cement was allowed to stand in water for 5min to hydrate.
And after standing, adding a non-porous base to the screen, putting the screen on a vibration screening instrument, covering a vibrating screen cover plate again, vibrating by using a vibrating screen with the amplitude of 0.5mm for 5min, so that cement which is not agglomerated in the cement flows into the screen bottom due to vibration dispersion, and agglomerated particles are remained on the screen. Taking the screen mesh down from the vibrating screen, taking out the preservative film wrapping the screen mesh, adding purified water at 20 ℃ from the bottom of the screen mesh to clean the screen mesh, using a crucible to receive cleaning water and agglomerated particles on the front surface of the screen mesh, ensuring that all the agglomerated particles flow into the crucible, standing the crucible for 3min for clarification, and draining the clean water to obtain the agglomerated particles.
Placing the crucible on a light wave furnace, adjusting the temperature to 150 ℃, baking until the water is completely evaporated, taking down the crucible by using a pliers, and cooling in air at 20 ℃ to obtain the part of the aggregate in the poured cement paste. And after the crucible is cooled to room temperature, weighing the dried agglomerated particles by using an electronic balance, and dividing the obtained weight by the added weight of 100g to obtain the neat paste agglomeration rate of the PP-1 cement.
Example 3
Taking PP-1 cement, and sequentially carrying out the test process according to the following steps:
the outer side of a square-hole screen with the aperture of 250 mu m is completely wrapped with the bottom by using a polyethylene preservative film, and the preservative film is fixed on the screen by using 2 rubber bands and is tightly attached to the bottom of the screen.
And (3) fully and uniformly mixing 1kg of PP-1 cement serial number after standing, and weighing 80g by using an electronic balance. Pouring 80g of cement into the screen gently, placing the screen on a vibration screening instrument with adjustable amplitude and time, covering a screen cover, vibrating the cement for 2min at the amplitude of 0.3mm by using a vibrating screen, discharging air in the cement, and flattening the cement in the screen.
The cover plate of the vibrating screen is opened, 1000ml of purified water with the water temperature of 20 ℃ is taken by a beaker, the edge of the beaker is attached to the edge of the screen mesh, water is poured into the screen mesh lightly to avoid directly sprinkling the water on the cement, the water needs to completely cover the surface of the cement and exceeds the surface of the cement by 3cm, a preservative film at the bottom of the screen mesh sinks naturally after being added with the water, a certain height is kept between the preservative film and the screen mesh, and the height of the filled water is at least 4 cm. The cement was allowed to stand in water for 4min to hydrate.
And after standing, adding a non-porous base to the screen, putting the screen on a vibration screening instrument, covering a vibrating screen cover plate again, vibrating by using a vibrating screen with the amplitude of 0.6mm for 4min, so that cement which is not agglomerated in the cement flows into the screen bottom due to vibration dispersion, and agglomerated particles are remained on the screen. Taking the screen mesh down from the vibrating screen, taking out the preservative film wrapping the screen mesh, adding purified water at 20 ℃ from the bottom of the screen mesh to clean the screen mesh, using a crucible to receive cleaning water and agglomerated particles on the front surface of the screen mesh to ensure that all the agglomerated particles flow into the crucible, standing the crucible for 4min for clarification, and draining the clean water to obtain the agglomerated particles.
Placing the crucible on a light wave furnace, adjusting the temperature to 200 ℃, baking until the water is completely evaporated, taking down the crucible by using a pliers, and cooling in air at 20 ℃ to obtain the part of the aggregate in the poured cement paste. And after the crucible is cooled to room temperature, weighing the dried agglomerated particles by using an electronic balance, and dividing the obtained weight by the added weight of 80g to obtain the neat paste agglomeration rate of the PP-1 cement.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be construed as the protection scope of the present invention.
Claims (5)
1. The method for quantifying cement clean slurry granulation is characterized by comprising the following steps of:
(1) preparation of the test: placing cement to be tested and test purified water in the same condition, standing for a period of time to ensure that the test conditions are consistent, then uniformly stirring the cement to be tested, weighing a certain weight of cement, placing the cement in a screen cloth wrapping a preservative film, placing the screen cloth on a vibration screening instrument with adjustable amplitude and time, covering a screen cover, vibrating the cement to discharge air in the cement, enabling the cement to be in close contact, and after vibration is finished, enabling the preservative film at the bottom of the screen cloth to keep a certain space with the bottom of the screen cloth;
(2) adding water into cement to hydrate and agglomerate: opening a vibrating screen cover plate, pouring the test pure water prepared in the step (1) into a screen along the edge of cement lightly, wherein the water addition amount needs to cover the surface of the cement completely and exceed the surface of the cement, and standing the cement in water to fully hydrate the cement;
(3) and (3) cement granulation and grain taking: after standing, adding a non-porous base to the screen, placing the screen on a vibration screening instrument, covering a vibration screen cover plate again, vibrating a mixture of water and cement, taking the screen down from the vibration screening instrument after vibration is finished, taking out a preservative film wrapping the screen, separating the water in the screen from the screen along with the preservative film, adding water from the bottom of the screen to clean the screen, simultaneously using a crucible on the front side of the screen to receive cleaning water and agglomerated particles, standing and clarifying the crucible, and draining the clear water to obtain the agglomerated particles;
(4) drying and weighing: and placing the crucible on a light wave furnace, baking until the water is completely evaporated to dryness to obtain the part of the aggregate in the poured cement paste, weighing the dried aggregate particles by using an electronic balance, and dividing the obtained weight by the total weight of the cement to obtain the agglomeration rate, wherein the agglomeration rate is used for representing the agglomeration degree of the cement paste.
2. The method for quantifying cement mortar caking as claimed in claim 1, wherein in step (1), the standing condition is standing at 20 ℃ for 12h, the screen is a 250um square mesh screen, and the vibration is vibration of the cement with an amplitude of 0.2mm for 1-2min by using a vibrating screen.
3. The method for quantifying cement net slurry and particle formation according to claim 1, wherein in the step (2), the water addition amount is required to completely cover the cement surface and exceed the cement surface by at least 1cm, the height of water between the preservative film at the bottom of the screen and the screen is more than 2cm, and the standing time is 3-5 min.
4. The method for quantifying cement mortar caking as claimed in claim 1, wherein in the step (3), the vibration is performed by vibrating the water and cement after the water is added with a vibration amplitude of 0.5-0.7mm for 3-5min by using a vibrating screen.
5. The method as claimed in claim 1, wherein the baking temperature in step (4) is 150-250 ℃.
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| JP2004075451A (en) * | 2002-08-16 | 2004-03-11 | Nippon Steel Corp | Fine aggregate, method of manufacturing fine aggregate and method of classifying blast furnace granulated slag |
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| EP3460448A1 (en) * | 2017-09-22 | 2019-03-27 | Siebtechnik GmbH | Method and multi-layer screening machine for determining the individual grain classes of a sample of material |
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|---|---|---|---|---|
| JP2004075451A (en) * | 2002-08-16 | 2004-03-11 | Nippon Steel Corp | Fine aggregate, method of manufacturing fine aggregate and method of classifying blast furnace granulated slag |
| CN105372162A (en) * | 2015-10-29 | 2016-03-02 | 巨石集团有限公司 | Method for testing granularity of glass fiber chopped strands |
| EP3460448A1 (en) * | 2017-09-22 | 2019-03-27 | Siebtechnik GmbH | Method and multi-layer screening machine for determining the individual grain classes of a sample of material |
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