CN112414909B - Cement specific surface area test method based on split type ventilation cylinder - Google Patents
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- 238000009423 ventilation Methods 0.000 title claims abstract description 51
- 239000004568 cement Substances 0.000 title claims abstract description 46
- 238000010998 test method Methods 0.000 title claims abstract description 15
- 239000011800 void material Substances 0.000 claims abstract description 25
- 238000000034 method Methods 0.000 claims abstract description 20
- 238000002360 preparation method Methods 0.000 claims abstract description 12
- 238000012360 testing method Methods 0.000 claims description 41
- 239000007788 liquid Substances 0.000 claims description 12
- 230000003746 surface roughness Effects 0.000 claims description 12
- 238000005303 weighing Methods 0.000 claims description 12
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 6
- 239000004519 grease Substances 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 4
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 claims description 4
- 229910052753 mercury Inorganic materials 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 238000010079 rubber tapping Methods 0.000 claims description 3
- 238000007790 scraping Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 7
- 238000001514 detection method Methods 0.000 abstract description 4
- 230000006872 improvement Effects 0.000 description 7
- 238000000465 moulding Methods 0.000 description 3
- 238000013022 venting Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000010561 standard procedure Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 241001374849 Liparis atlanticus Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000012795 verification 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
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/088—Investigating volume, surface area, size or distribution of pores; Porosimetry
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- General Health & Medical Sciences (AREA)
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Abstract
The invention relates to a cement specific surface area test method based on a split type ventilation cylinder, which adopts the split type ventilation cylinder to measure the cement specific surface area, wherein the split type ventilation cylinder comprises an upper cylinder body, a lower cylinder body and a perforated plate, the periphery of the upper cylinder body is provided with a first conical surface, and the lower end of the upper cylinder body is provided with internal threads; the periphery of lower barrel is provided with the second conical surface, and the inside of lower barrel is provided with the boss that is used for supporting the perforated plate, and the upper portion of lower barrel is provided with the external screw thread with internal screw thread assorted, the lower part of upper barrel and the upper portion threaded connection of lower barrel. The test method avoids the problem that the void ratios of different tested materials are not easy to determine, the sample preparation is more convenient, the void ratio can not be considered for preparing the sample, and the method has the obvious advantages of quick and efficient sample preparation; the operability is strong, the height of the sample layer can be accurately controlled, the error can be effectively reduced, and the uncertainty of detection data is reduced.
Description
Technical Field
The invention relates to a cement specific surface area test method based on a split type ventilation cylinder, and belongs to the technical field of cement fineness measurement.
Background
The specific surface area of cement measured in the cement industry is determined according to GB/T8074-2008 ' Cement specific surface area determination method_Bo ' method '. The standard is suitable for measuring specific surface area of cement and the specific surface area suitable for the method is 2000-6000cm 2 The specific surface area of cement is determined based on the change in flow rate caused by the difference in resistance when a certain amount of air passes through a cement layer having a certain void fraction and a fixed thickness.
When the specific surface area is measured, a cement sample of a certain mass is contained in a gas-permeable cylinder. The charging method specified in the current national standard GB/T8074-2008 "cement specific surface area determination method_Bo method" is as follows:
the perforated plate is placed on the flange of the breathable cylinder, a piece of filter paper is sent to the perforated plate by a tamper, and the edges are flattened and pressed. The determined amount of cement was weighed to the nearest 0.001g and poured into a cylinder. The edges of the cylinder were tapped to planarize the cement layer surface. And then a piece of filter paper is put in, the sample is uniformly tamped by the tamping machine until the supporting ring of the tamping machine contacts with the top edge of the cylinder, the tamping machine is rotated for 1-2 circles, and the tamping machine is slowly taken out.
This charging method has the following disadvantages:
the sample preparation of specific surface area requires one-step molding, and the volume after molding is strict. In practical work, the quality of the sample is found to be the most difficult to determine, because the national standard recommended porosity is data of more than ten years ago, the existing cement production process is changed greatly, and the porosity is basically not too great in reference value, namely, the porosity must be slowly adjusted for one-time molding until a 2000g weight is found to press the cement to the porosity of the required sample volume; the operation is very complicated, and the time and the labor are consumed.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides a cement specific surface area test method based on a split type ventilation cylinder, which comprises the following specific technical scheme:
the cement specific surface area test method based on the split type ventilation cylinder adopts the split type ventilation cylinder to measure the cement specific surface area, the split type ventilation cylinder comprises an upper cylinder body, a lower cylinder body and a perforated plate, the periphery of the upper cylinder body is provided with a first conical surface, and the lower end of the upper cylinder body is provided with internal threads; the periphery of lower barrel is provided with the second conical surface, the inside of lower barrel is provided with the boss that is used for supporting the perforated plate, the boss is located the lower part of lower barrel, the upper portion of lower barrel is provided with the external screw thread with internal screw thread assorted, the lower part of upper barrel and the upper portion threaded connection of lower barrel.
The cement specific surface area test method based on the split type ventilation cylinder comprises the following steps:
step one, measuring the density of cement
Measuring the density of a sample to be measured according to the GB/T208 standard;
step two, checking for air leakage
The upper end of the split type ventilation cylinder is plugged by a rubber plug and connected to a pressure gauge; extracting gas from one arm of the pressure gauge by using an air extracting device, and then closing the valve; observing whether air leakage occurs; if leakage is found, the piston grease can be used for sealing;
step three, sample layer preparation
3.1 weighing the measured material m 1 ，m 1 Greater than the required sample amount (m 1 The recommended void ratio can also be determined first by referring to GB/T8074-2008, and the mass of the sample is generally larger than that of the required sample);
3.2, placing the perforated plate on a boss in the lower cylinder, placing a piece of filter paper on the perforated plate by using a tamper, and leveling and compacting the edge; weighing the sample to 0.001g accurately; pouring the assembled split type ventilation cylinder; tapping the edge of the split type ventilation cylinder to make the surface of the cement layer flat; putting a piece of filter paper, tamping the sample with a tamping machine until the support ring of the tamping machine is 1-2mm higher than the top edge of the cylinder, rotating for 1-2 circles, slowly taking out the tamping machine, and weighing the total mass m 2 ；
Wherein in step 3.1, when the sample amount is insufficient to press the sample to the position specified in step 3.2, the sample amount is allowed to be changed; the sample amount is adjusted by compacting the sample to a position higher than the position specified in the step 3.2 by a weight of 2000 g; in step 3.2, weighing the sample amount determined in step 3.3 to 0.001g, and pouring into the assembled split type ventilation cylinder;
3.3, slowly unscrewing the upper cylinder, removing redundant samples on the surface of the lower cylinder by using a small scraper, cleaning by using a small brush, returning filter paper, slowly assembling the split type ventilation cylinder, and weighing the total mass m at the moment 3 ；
3.4 the filter paper on the perforated plate isRound filter paper sheets with smooth edges are needed to be used for each measurement;
determining the sample quantity
The sample amount is calculated according to the formula: m=m 1 -m 2 +m 3 ；
m is the sample size of the sample to be measured, and is given in grams;
m 1 the mass of the sample to be measured is measured in grams;
m 2 the mass of the split type breathable cylinder filled with the sample to be tested is in grams;
m 3 the mass of the split type ventilation cylinder for scraping redundant measured samples is given in grams;
or (b)
m＝m 4 -m 5 ；
m 4 The mass of the lower cylinder body filled with the sample to be measured is given in grams;
m 5 the mass of the lower cylinder body is measured in grams, and the lower cylinder body is not filled with a measured sample;
step five, determining the void fraction
The void fraction is calculated according to the formula: epsilon=1-m/(ρv);
epsilon is the void fraction of the test layer;
m is the sample size of the sample to be measured, and is given in grams;
ρ is the sample density in grams per cubic centimeter;
v is the volume of the test layer, measured according to JC/T956 standard, in cubic centimeters;
step six, ventilation test
6.1, coating a layer of piston grease on the second conical surface of the lower cylinder provided with the test layer, then inserting the lower part of the lower cylinder into a conical grinding port at the top end of the pressure gauge, and rotating for 1-2 circles;
6.2, opening the micro electromagnetic pump to slowly pump air out of the arm of the pressure gauge until the liquid level in the pressure gauge rises to the lower end of the expansion part, and closing the valve; when the concave moon surface of the liquid in the pressure gauge descends to a first dividing line, starting timing, and when the concave moon surface of the liquid descends to a second dividing line, stopping timing, and recording the time required by the liquid level from the first dividing line to the second dividing line in seconds; and recording the temperature during the test; the test layer should be prepared again for each ventilation test.
As an improvement of the technical proposal, m 1 The amount of the sample is 0.02-0.03g more than that of the required sample.
As an improvement of the technical scheme, the adjustment of the sample amount is based on the fact that the 2000g weight compacts the sample to be 1-2mm higher than the position specified in the step 2.2.
As an improvement of the technical scheme, the volume of the lower cylinder body is calibrated by using mercury.
As an improvement of the technical scheme, the surface roughness of the inner wall of the upper cylinder is not more than Ral.6, the surface roughness of the first conical surface is not more than Ral.6, the surface roughness of the inner wall of the lower cylinder is not more than Ral.6, and the surface roughness of the second conical surface is not more than Ral.6.
As an improvement of the technical scheme, the inner diameter of the upper part of the lower cylinder body is equal to the inner diameter of the upper cylinder body, and the inner diameter of the upper cylinder body is 12.70mm.
As an improvement of the above technical solution, the second conical surface and the first conical surface are arranged coplanar.
The invention has the beneficial effects that:
1) The problem that the void ratios of different tested materials are not easy to determine is avoided.
2) The sealing device can not leak air in the use process, and has good sealing performance.
3) The sample preparation is more convenient, the void ratio can be eliminated, and the method has the obvious advantages of quick and efficient sample preparation.
4) The method has strong operability, can accurately control the height of the sample layer, can effectively reduce errors and reduce the uncertainty of detection data.
5) High strength, and no deformation affecting the test.
6) The test is carried out under the test conditions of a plurality of models of manual Bosch's instruments and automatic Bosch's instruments, and the test capability is reliable.
Drawings
FIG. 1 is a schematic view of a split venting cylinder according to the present invention;
FIG. 2 is a schematic view of the structure of the upper cylinder according to the present invention;
FIG. 3 is a schematic view of the structure of the lower cylinder according to the present invention;
FIG. 4 is a schematic illustration of cylinder volume under mercury calibration;
FIG. 5 is a schematic view of a split venting cylinder for loading a sample to be tested;
FIG. 6 is a schematic diagram of a 2000g weight loaded;
FIG. 7 is a schematic diagram of the removal of a small amount of excess material;
FIG. 8 is a schematic illustration of a split venting cylinder as it is fitted into a Bosch vent.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
According to the cement specific surface area test method based on the split type ventilation cylinder, the split type ventilation cylinder is adopted to measure the specific surface area of cement. As shown in fig. 1-3, the split ventilation cylinder comprises an upper cylinder 11, a lower cylinder 12 and a perforated plate 13, wherein a first conical surface 111 is arranged on the periphery of the upper cylinder 11, and an internal thread 112 is arranged at the lower end of the upper cylinder 11; the periphery of lower barrel 12 is provided with second conical surface 121, the inside of lower barrel 12 is provided with the boss that is used for supporting perforated plate 13, the boss is located the lower part of lower barrel 12, the upper portion of lower barrel 12 is provided with the external screw thread 122 with internal screw thread 112 assorted, the lower part of upper barrel 11 and the upper portion threaded connection of lower barrel 12.
The specific surface area test method is to measure the specific surface area of cement mainly based on the change of flow rate caused by the difference of the resistance when a certain amount of air passes through a cement layer having a certain void ratio and a fixed thickness. In a cement layer of a certain void fraction, the size and number of voids is a function of the particle size and also determines the air flow rate through the layer.
The upper cylinder 11 and the lower cylinder 12 can be made of stainless steel or copper materials. The surface roughness of the inner wall of the upper cylinder 11 is not greater than ral.6, the surface roughness of the first conical surface 111 is not greater than ral.6, the surface roughness of the inner wall of the lower cylinder 12 is not greater than ral.6, and the surface roughness of the second conical surface 121 is not greater than ral.6. The inner diameter of the upper part of the lower cylinder 12 is equal to the inner diameter of the upper cylinder 11, and the inner diameter of the upper cylinder 11 is 12.70mm. The inner diameter of the upper part of the lower cylinder 12 is the part of the space above the boss. The second conical surface 121 and the first conical surface 111 are arranged in a coplanar manner. The taper of the first taper 111 and the second taper 121 are both 19/38.
As shown in fig. 4, the volume of the lower cylinder was calibrated using mercury.
The cement specific surface area test method based on the split type ventilation cylinder comprises the following steps:
step one, measuring the density of cement
Measuring the density of a sample to be measured according to the GB/T208 standard;
step two, checking for air leakage
The upper end of the split type ventilation cylinder is plugged by a rubber plug and connected to a pressure gauge; extracting gas from one arm of the pressure gauge by using an air extracting device, and then closing the valve; observing whether air leakage occurs; if leakage is found, the piston grease can be used for sealing;
step three, sample layer preparation
3.1 weighing the measured material m 1 ，m 1 Greater than the desired sample amount; when the sample amount is insufficient to press the sample to 3.2 prescribed positions, the sample amount is allowed to be changed; adjustment of the sample amount the sample was compacted to a position higher than that specified in step 3.2 with a 2000g weight, as shown in fig. 5; wherein m is 1 The amount of the sample is 0.02-0.03g more than that of the required sample.
3.2, placing the perforated plate on a boss in the lower cylinder, placing a piece of filter paper on the perforated plate by using a tamper, and leveling and compacting the edge; weighing the sample amount determined according to the 3.3 th step to 0.001g; pouring the assembled split type ventilation cylinder; tapping the edge of the split type ventilation cylinder to make the surface of the cement layer flat; putting a piece of filter paper, tamping the sample uniformly by a tamping machine until the supporting ring of the tamping machine is 1-2mm higher than the top edge of the cylinder, rotating for 1-2 circles, slowly taking out the tamping machine, and weighing the total mass m 2 ；
The sample amount was adjusted by compacting the sample to a position 1-2mm above the position specified in step 3.2 with a 2000g weight.
3.3, slowly unscrewing the upper cylinder, removing excessive sample on the surface of the lower cylinder by using a small scraper, cleaning by using a small brush, putting filter paper back, slowly assembling the split type ventilation cylinder, and weighing the total mass m at the moment 3 ；
3.4 the filter paper on the perforated plate isRound filter paper sheets with smooth edges are needed to be used for each measurement;
determining the sample quantity
The sample amount is calculated according to the formula: m=m 1 -m 2 +m 3 ；
m is the sample size of the sample to be measured, and is given in grams;
m 1 the mass of the sample to be measured is measured in grams;
m 2 the mass of the split type breathable cylinder filled with the sample to be tested is in grams;
m 3 the mass of the split type ventilation cylinder for scraping redundant measured samples is given in grams;
or (b)
m＝m 4 -m 5 ；
m 4 The mass of the lower cylinder body filled with the sample to be measured is given in grams;
m 5 the mass of the lower cylinder body is measured in grams, and the lower cylinder body is not filled with a measured sample;
step five, determining the void fraction
The void fraction is calculated according to the formula: epsilon=1-m/(ρv);
epsilon is the void fraction of the test layer;
m is the sample size of the sample to be measured, and is given in grams;
ρ is the sample density in grams per cubic centimeter;
v is the volume of the test layer, measured according to JC/T956 standard, in cubic centimeters;
step six, ventilation test
6.1, coating a layer of piston grease on the second conical surface of the lower cylinder provided with the test layer, and then inserting the lower part of the lower cylinder into a conical grinding port at the top end of the pressure gauge, and rotating for 1-2 circles, as shown in figure 7;
6.2, opening the micro electromagnetic pump to slowly pump air out of the arm of the pressure gauge until the liquid level in the pressure gauge rises to the lower end of the expansion part, and closing the valve; when the concave moon surface of the liquid in the pressure gauge descends to a first dividing line, starting timing, and when the concave moon surface of the liquid descends to a second dividing line, stopping timing, and recording the time required by the liquid level from the first dividing line to the second dividing line in seconds; and recording the temperature during the test; the test layer should be prepared again for each ventilation test;
example verification:
the stability of the sea snail cement P.O 42.5 is qualified, the three-day fracture resistance and the compressive strength are respectively 5.7MPa and 32.5MPa, and the twenty-eight-day fracture resistance and the compressive strength are respectively 7.1MPa and 45.2MPa.
Cement specific surface area standard sample: chinese building materials institute Co., ltd, specific surface area value 3910cm 2 Per gram, density value 3.15g/cm 3 Void fraction 0.500.
The void ratio is 0.50 for detection, a 2000g weight is used for compaction, a split type ventilation cylinder is used for carrying out the test steps according to the invention, the void ratio of the traditional ventilation cylinder is increased or decreased by 0.02, and the optimal specific surface area is obtained by measuring the optimal void ratio. During the ventilation test, the preparation of the test layer is as compact as possible, so that the specific surface area of the cement is closer to the true value.
Results were measured using a split gas-permeable cylinder under substantially the same test conditions (4470 cm 2 /g), the difference between the secondary test results is 1.1%; results obtained with conventional vented cylinder (4540 cm) 2 /g), the secondary test results differ by 1.5%. The absolute value of the relative error was 0.78%. The test time of using split type ventilative drum is about 60% of using traditional ventilative drum, can effectively save time, promotes inspection work efficiency.
In the embodiment, the cement specific surface area test method based on the split type ventilation cylinder is an improvement of the national standard method. The national standard method is to determine the void ratio and then determine the sample mass, and the invention is to determine the sample mass and then determine the void ratio. Therefore, the cement specific surface area test method based on the split type ventilation cylinder has the following advantages:
1. the problem that the void ratios of different tested materials are not easy to determine is avoided.
2. Can not leak air in the use process, and has good sealing performance.
3. The sample preparation is more convenient, the sample preparation can be carried out without considering the void ratio, and the method has the obvious advantages of quick and efficient sample preparation.
4. The operability is strong, the height of the sample layer can be accurately controlled, the error can be effectively reduced, and the uncertainty of detection data is reduced.
5. High strength and no deformation affecting the test.
6. The practice proves that the test can be carried out under the test conditions of various types of manual Boehringer's instruments and automatic Boehringer's instruments and the test capability is reliable.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (5)
1. A cement specific surface area test method based on a split type ventilation cylinder is characterized by comprising the following steps of: the cement specific surface area is measured by adopting a split type ventilation cylinder, the split type ventilation cylinder comprises an upper cylinder body, a lower cylinder body and a perforated plate, a first conical surface is arranged on the periphery of the upper cylinder body, and an internal thread is arranged at the lower end of the upper cylinder body; the periphery of the lower cylinder body is provided with a second conical surface, a boss for supporting the perforated plate is arranged in the lower cylinder body, the boss is positioned at the lower part of the lower cylinder body, the upper part of the lower cylinder body is provided with external threads matched with the internal threads, and the lower part of the upper cylinder body is in threaded connection with the upper part of the lower cylinder body;
the cement specific surface area test method based on the split type ventilation cylinder comprises the following steps of:
step one, measuring the density of cement
Measuring the density of a sample to be measured according to the GB/T208 standard;
step two, checking for air leakage
The upper end of the split type ventilation cylinder is plugged by a rubber plug and connected to a pressure gauge; extracting gas from one arm of the pressure gauge by using an air extracting device, and then closing the valve; observing whether air leakage occurs; if leakage is found, sealing by using piston grease;
step three, sample layer preparation
3.1, setting the sample quantity m of the measured sample to be weighed 1 ，m 1 Greater than the desired sample amount;
3.2, placing the perforated plate on a boss in the lower cylinder, placing a piece of filter paper on the perforated plate by using a tamper, and leveling and compacting the edge; weighing sample amount m 1 Accurate to 0.001g; pouring the assembled split type ventilation cylinder; tapping the edge of the split type ventilation cylinder to make the surface of the cement layer flat; putting a piece of filter paper, tamping the sample with a tamping machine until the support ring of the tamping machine is 1-2mm higher than the top edge of the cylinder, rotating for 1-2 circles, slowly taking out the tamping machine, and weighing the total mass m 2 ；
Wherein, in step 3.1, when the sample amount m is the same as that described above 1 Insufficient to press the sample to the position specified in step 3.2, the sample amount m is allowed to be changed 1 The method comprises the steps of carrying out a first treatment on the surface of the Sample amount m 1 Compacting the test specimen to the position specified in step 3.2 with a 2000g weight; in step 3.2, the sample amount m determined in step 3.1 is weighed 1 To 0.001g, pouring into an assembled split type ventilation cylinder;
3.3, slowly unscrewing the upper cylinder, removing redundant samples on the surface of the lower cylinder by using a small scraper, cleaning by using a small brush, returning filter paper, slowly assembling the split type ventilation cylinder, and weighing the total mass m at the moment 3 ；
3.4 the filter paper on the perforated plate isRound filter paper sheets with smooth edges are needed to be used for each measurement;
determining the sample quantity
The sample amount is calculated according to the formula: m=m 1 -m 2 +m 3 ；
m is the sample size of the sample to be measured, and is given in grams;
m 1 the mass of the measured sample is measured, and the unit is gram;
m 2 the mass of the split type breathable cylinder filled with the sample to be tested is in grams;
m 3 the mass of the split type ventilation cylinder for scraping redundant measured samples is given in grams;
or (b)
m＝m 4 -m 5 ；
m 4 The mass of the lower cylinder body filled with the sample to be measured is given in grams;
m 5 the mass of the lower cylinder body is measured in grams, and the lower cylinder body is not filled with a measured sample;
step five, determining the void fraction
The void fraction is calculated according to the formula: epsilon=1-m/(ρv);
epsilon is the void fraction of the test layer;
ρ is the sample density in grams per cubic centimeter;
v is the volume of the test layer, measured according to JC/T956 standard, in cubic centimeters;
step six, ventilation test
6.1, coating a layer of piston grease on the second conical surface of the lower cylinder provided with the test layer, then inserting the lower part of the lower cylinder into a conical grinding port at the top end of the pressure gauge, and rotating for 1-2 circles;
6.2, opening the micro electromagnetic pump to slowly pump air out of the arm of the pressure gauge until the liquid level in the pressure gauge rises to the lower end of the expansion part, and closing the valve; when the concave moon surface of the liquid in the pressure gauge descends to a first dividing line, starting timing, and when the concave moon surface of the liquid descends to a second dividing line, stopping timing, and recording the time required by the liquid level from the first dividing line to the second dividing line in seconds; and recording the temperature during the test; the test layer should be prepared again for each ventilation test;
m 1 the amount of the sample is 0.02-0.03g more than that of the required sample.
2. The method for testing the specific surface area of cement based on the split type ventilation cylinder according to claim 1, wherein the method comprises the following steps of: the volume of the lower cylinder was calibrated using mercury.
3. The method for testing the specific surface area of cement based on the split type ventilation cylinder according to claim 1, wherein the method comprises the following steps of: the surface roughness of the inner wall of the upper cylinder is not more than Ral.6, the surface roughness of the first conical surface is not more than Ral.6, the surface roughness of the inner wall of the lower cylinder is not more than Ral.6, and the surface roughness of the second conical surface is not more than Ral.6.
4. The method for testing the specific surface area of cement based on the split type ventilation cylinder according to claim 1, wherein the method comprises the following steps of: the inner diameter of the upper part of the lower cylinder body is equal to the inner diameter of the upper cylinder body, and the inner diameter of the upper cylinder body is 12.70mm.
5. The method for testing the specific surface area of cement based on the split type ventilation cylinder according to claim 1, wherein the method comprises the following steps of: the second conical surface and the first conical surface are arranged in a coplanar mode.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006016660A1 (en) * | 2004-08-12 | 2006-02-16 | Herzog Japan Co., Ltd. | Molding device for sample for measuring specific surface area of powder |
| CN103760070A (en) * | 2014-01-10 | 2014-04-30 | 洛阳理工学院 | Method for determining quantity of fed specimens in breathable cylinder of brinell breathable specific surface area instrument |
| CN107101860A (en) * | 2017-05-27 | 2017-08-29 | 洛阳理工学院 | A kind of method for installing sample in the ventilative cylinder to the ventilative ratio surface area instruments of Bo Shi additional |
-
2020
- 2020-06-12 CN CN202010534393.XA patent/CN112414909B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006016660A1 (en) * | 2004-08-12 | 2006-02-16 | Herzog Japan Co., Ltd. | Molding device for sample for measuring specific surface area of powder |
| CN103760070A (en) * | 2014-01-10 | 2014-04-30 | 洛阳理工学院 | Method for determining quantity of fed specimens in breathable cylinder of brinell breathable specific surface area instrument |
| CN107101860A (en) * | 2017-05-27 | 2017-08-29 | 洛阳理工学院 | A kind of method for installing sample in the ventilative cylinder to the ventilative ratio surface area instruments of Bo Shi additional |
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| CN112414909A (en) | 2021-02-26 |
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