CN112414909A - Cement specific surface area test method based on split type breathable cylinder - Google Patents
Cement specific surface area test method based on split type breathable cylinder Download PDFInfo
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- 239000004568 cement Substances 0.000 title claims abstract description 45
- 238000010998 test method Methods 0.000 title claims abstract description 20
- 238000012360 testing method Methods 0.000 claims abstract description 39
- 239000000463 material Substances 0.000 claims abstract description 21
- 239000011800 void material Substances 0.000 claims abstract description 18
- 238000002360 preparation method Methods 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 12
- 238000005303 weighing Methods 0.000 claims description 17
- 239000007788 liquid Substances 0.000 claims description 12
- 238000005259 measurement Methods 0.000 claims description 6
- 230000005499 meniscus Effects 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 6
- 239000004519 grease Substances 0.000 claims description 4
- 238000007689 inspection 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
- 230000035699 permeability Effects 0.000 claims description 4
- 241000733322 Platea Species 0.000 claims description 3
- 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
- 238000003825 pressing Methods 0.000 claims description 3
- 238000010079 rubber tapping Methods 0.000 claims description 3
- 238000007790 scraping Methods 0.000 claims description 3
- 238000013022 venting Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 3
- 230000006872 improvement Effects 0.000 description 8
- 238000007789 sealing Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000010561 standard procedure Methods 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 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
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 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
- 230000008569 process Effects 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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Abstract
The invention relates to a cement specific surface area test method based on a split type breathable cylinder, which is characterized in that the cement specific surface area is measured by adopting the split type breathable cylinder, the split type breathable 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 barrel is provided with the second toper face down, and the inside of barrel is provided with the boss that is used for supporting the perforated plate down, and the upper portion of barrel is provided with the external screw thread with internal thread assorted down, goes up the lower part of barrel and the upper portion threaded connection of barrel down. The test method avoids the problem that the void ratio of different tested materials is not easy to determine, the preparation of the test material is more convenient, the sample preparation without considering the void ratio can be realized, and the obvious advantages of quick and efficient sample preparation are achieved; 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.
Description
Technical Field
The invention relates to a cement specific surface area test method based on a split type breathable cylinder, and belongs to the technical field of cement fineness measurement.
Background
The specific surface area of cement is determined according to GB/T8074-. The standard is suitable for measuring the specific surface area of cement and the specific surface area suitable for the method is 2000-6000cm2The measurement principle of the other powdery materials is to measure the specific surface area of the cement according to the change of flow rate caused by different resistance when a certain amount of air passes through a cement layer with certain porosity and fixed thickness.
When the specific surface area is measured, a certain mass of cement sample is contained in a gas-permeable cylinder. The charging method specified by the current national standard GB/T8074 and 2008 ' method for measuring specific surface area of cement _ Bo ' method ' is as follows:
the perforated plate is placed on the flange of the air-permeable cylinder, a piece of filter paper is fed onto the perforated plate by a tamper, and the edge is laid flat and pressed tightly. The determined amount of cement was weighed to the nearest 0.001g and poured into a cylinder. The edge of the cylinder is tapped to flatten the surface of the cement layer. And then putting a piece of filter paper, uniformly tamping the sample by using a tamper until a support ring of the tamper is contacted with the top edge of the cylinder, rotating the tamper for 1-2 circles, and slowly taking out the tamper.
This method of charging has the following disadvantages:
the preparation of a sample having a specific surface area requires one-shot molding and the volume after molding is strictly required. In practical work, the sample quality is found to be the most difficult to determine, because the national standard recommended porosity is data over ten years ago, the current cement production process changes a lot, the porosity basically has no great reference value, namely the porosity must be slowly adjusted to be formed once, and the porosity is just compacted to the required sample volume by finding a 2000g weight; the operation is very complicated, and the time and the labor are consumed.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a cement specific surface area test method based on a split type breathable cylinder, which has the following specific technical scheme:
a cement specific surface area test method based on a split type breathable cylinder is characterized in that the split type breathable cylinder is used for measuring the cement specific surface area, and comprises an upper cylinder body, a lower cylinder body and a perforated plate, wherein 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 barrel is provided with the second toper face down, the inside of barrel is provided with the boss that is used for supporting the orifice plate down, the boss is located the lower part of barrel down, the upper portion of barrel is provided with the external screw thread with internal thread assorted down, the lower part of going up the barrel is connected with the upper portion screw thread of barrel down.
The cement specific surface area test method based on the split type breathable cylinder comprises the following steps:
step one, measuring the density of cement
Measuring the density of the measured sample according to GB/T208 standard;
step two, air leakage inspection
The upper end of the split type ventilating cylinder is plugged by a rubber plug and connected to a pressure gauge; pumping gas from one arm of the pressure gauge by using a gas pumping device, and then closing the valve; observing whether air leakage occurs; if air leakage is found, the piston can be used for sealing;
step three, preparation of sample layer
3.1, weighing the measured material m1，m1Greater than the required sample size (m)1Can also be determined by reference to GB/T8074-2008 recommends that the void ratio is first determined, and is generally greater than the required sample mass);
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 flatly placing and pressing the edge of the perforated plate; weighing a sample amount to be accurate to 0.001 g; pouring the mixture into the assembled split type breathable cylinder; tapping the edge of the split type breathable cylinder to enable the surface of the cement layer to be flat; putting a piece of filter paper, uniformly tamping the sample by a tamper until the supporting ring of the tamper is 1-2mm higher than the top edge of the cylinder, rotating for 1-2 circles, slowly taking out the tamper, and weighing the total mass m2；
Wherein, in step 3.1, when the sample amount is not enough 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 according to the condition that a 2000g weight compacts the sample to a position higher than the position specified in the step 3.2; in the step 3.2, weighing the sample amount determined in the step 3.3 to be accurate to 0.001g, and pouring the sample amount into the assembled split type breathable cylinder;
3.3, fixing the split type breathable cylinder, slowly rotating the upper cylinder body, removing the redundant sample on the surface of the lower cylinder body by using a small scraper, cleaning the sample by using a small brush, putting back the filter paper, slowly assembling the split type breathable cylinder, and weighing the total mass m at the moment3；
3.4 Filter paper on perforated plate
A round filter paper sheet with smooth edges, wherein a new filter paper sheet is needed for each measurement;
step four, determining the sample amount
The sample amount is calculated according to the formula: m is m1-m2+m3；
m is the sample amount of the sample to be measured, and the unit is gram;
m1weighing the quality of a sample to be measured, wherein the unit is gram;
m2the mass of the split type breathable cylinder filled with a tested sample is gram;
m3the mass of the split type breathable cylinder for scraping the redundant tested sample is gram;
or
m＝m4-m5；
m4The weight of the lower cylinder filled with the tested sample is in grams;
m5the weight of the lower cylinder without the tested sample is expressed in grams;
step five, determining the void ratio
The void ratio is calculated according to the formula: 1-m/(ρ V);
epsilon is the void fraction of the test material layer;
m is the sample amount of the sample to be measured, and the unit is gram;
ρ is the sample density in grams per cubic centimeter;
v is the volume of the test material layer, measured according to JC/T956 standard, and has the unit of cubic centimeter;
step six, air permeability test
6.1, coating a layer of piston grease on the second conical surface of the lower cylinder body provided with the test material layer, then inserting the lower part of the lower cylinder body into a conical grinding opening at the top end of the pressure gauge, and rotating for 1-2 circles;
6.2, opening the miniature 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; starting timing when the meniscus of the liquid in the pressure gauge descends to a first scale line, stopping timing when the meniscus of the liquid descends to a second scale line, recording the time required by the liquid level from the first scale line to the second scale line, and recording in seconds; and recording the temperature during the test; the test bed should be prepared anew for each venting test.
As an improvement of the above technical solution, m10.02-0.03g more than the required sample amount.
As an improvement of the technical proposal, the sample amount is adjusted based on that the sample is compacted to a position 1-2mm higher than the position specified in the step 2.2 by a 2000g weight.
As an improvement of the technical scheme, mercury is used for calibrating the volume of the lower cylinder.
As an improvement of the above technical solution, the roughness of the inner wall of the upper cylinder is not greater than ral.6, the roughness of the first conical surface is not greater than ral.6, the roughness of the inner wall of the lower cylinder is not greater than ral.6, and the roughness of the second conical surface is not greater 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 that of the upper cylinder body, and the inner diameter of the upper cylinder body is 12.70 mm.
As an improvement of the technical scheme, the second conical surface and the first conical surface are arranged in a coplanar manner.
The invention has the beneficial effects that:
1) the problem that the void ratio of different tested materials is not easy to determine is solved.
2) The air leakage is avoided in the using process, and the sealing performance is good.
3) The preparation of the sample is more convenient, the sample preparation can be carried out without considering the porosity, and the method has the obvious advantages of rapid 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) The strength is high, and deformation which influences the test cannot be generated.
6) The practice proves that the device has the capability of testing and reliably testing under the test conditions of various models of manual Boehringer and automatic Boehringer.
Drawings
FIG. 1 is a schematic structural view of a split type breathable cylinder according to the present invention;
FIG. 2 is a schematic structural view of the upper cylinder according to the present invention;
FIG. 3 is a schematic structural view of the lower cylinder according to the present invention;
FIG. 4 is a schematic illustration of mercury calibration of the lower cylinder volume;
FIG. 5 is a schematic view of a 2000g weight being loaded;
FIG. 6 is a schematic illustration of the removal of a small amount of excess material;
FIG. 7 is a schematic view of the split permeable cylinder when installed in a Boehringer apparatus;
FIG. 8 is a schematic view of a Boehringer breathalyzer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The cement specific surface area test method based on the split type breathable cylinder adopts the split type breathable cylinder to measure the cement specific surface area. As shown in fig. 1-3, the split type ventilation cylinder comprises an upper cylinder body 11, a lower cylinder body 12 and a perforated plate 13, wherein a first conical surface 111 is arranged on the periphery of the upper cylinder body 11, and an internal thread 112 is arranged at the lower end of the upper cylinder body 11; the periphery of the lower cylinder 12 is provided with a second conical surface 121, the interior of the lower cylinder 12 is provided with a boss for supporting the perforated plate 13, the boss is located at the lower part of the lower cylinder 12, the upper part of the lower cylinder 12 is provided with an external thread 122 matched with the internal thread 112, and the lower part of the upper cylinder 11 is in threaded connection with the upper part of the lower cylinder 12.
The specific surface area test method is mainly used for measuring the specific surface area of cement according to the change of flow rate caused by different resistance when a certain amount of air passes through a cement layer with a certain porosity and a fixed thickness. In a cement bed of a given porosity, the size and number of voids is a function of the particle size and also determines the velocity of the air flow through the bed.
The upper cylinder body 11 and the lower cylinder body 12 can be made of stainless steel or copper materials. The roughness of the inner wall of the upper cylinder 11 is not more than ral.6, the roughness of the first conical surface 111 is not more than ral.6, the roughness of the inner wall of the lower cylinder 12 is not more than ral.6, and the roughness of the second conical surface 121 is not more than ral.6. The inner diameter of the upper part of the lower cylinder 12 is equal to that of the upper cylinder 11, and the inner diameter of the upper cylinder 11 is 12.70 mm. The inner diameter of the upper part of the lower cylinder body 12 is the space above the lug boss. The second tapered surface 121 and the first tapered surface 111 are disposed coplanar. The first tapered surface 111 and the second tapered surface 121 both have a taper of 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 breathable cylinder comprises the following steps:
step one, measuring the density of cement
Measuring the density of the measured sample according to GB/T208 standard;
step two, air leakage inspection
The upper end of the split type ventilating cylinder is plugged by a rubber plug and connected to a pressure gauge; pumping gas from one arm of the pressure gauge by using a gas pumping device, and then closing the valve; observing whether air leakage occurs; if air leakage is found, the piston can be used for sealing;
step three, preparation of sample layer
3.1, weighing the measured material m1，m1Greater than the required sample size; when the sample amount is not enough to press the sample to the specified position of 3.2 strips, the sample amount is allowed to be changed; the sample amount is adjusted based on the 2000g weight to compact the sample to a position higher than that specified in step 3.2, as shown in fig. 5; wherein m is10.02-0.03g more than the required 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 flatly placing and pressing the edge of the perforated plate; weighing the sample amount determined in item 3.3 to the precise0.001 g; pouring the assembled split type breathable cylinder; tapping the edge of the split type breathable cylinder to enable the surface of the cement layer to be flat; then putting a piece of filter paper, uniformly tamping the sample by using a tamper until the supporting ring of the tamper is 1-2mm higher than the top edge of the cylinder, rotating for 1-2 circles, slowly taking out the tamper, and weighing the total mass m2；
The sample amount was adjusted by compacting the sample with a 2000g weight to a height of 1-2mm above the position specified in step 3.2.
3.3, fixing the split type breathable cylinder, slowly unscrewing the upper cylinder body, removing the redundant sample on the surface of the lower cylinder body by using a small scraper, cleaning the sample by using a small brush as shown in figure 6, putting back the filter paper, slowly assembling the split type breathable cylinder, and weighing the total mass m at the moment3；
3.4 Filter paper on perforated plate
A round filter paper sheet with smooth edges, wherein a new filter paper sheet is needed for each measurement;
step four, determining the sample amount
The sample amount is calculated according to the formula: m is m1-m2+m3；
m is the sample amount of the sample to be measured, and the unit is gram;
m1weighing the quality of a sample to be measured, wherein the unit is gram;
m2the mass of the split type breathable cylinder filled with a tested sample is gram;
m3the mass of the split type breathable cylinder for scraping the redundant tested sample is gram;
or
m＝m4-m5；
m4The weight of the lower cylinder filled with the tested sample is in grams;
m5the weight of the lower cylinder without the tested sample is expressed in grams;
step five, determining the void ratio
The void ratio is calculated according to the formula: 1-m/(ρ V);
epsilon is the void fraction of the test material layer;
m is the sample amount of the sample to be measured, and the unit is gram;
ρ is the sample density in grams per cubic centimeter;
v is the volume of the test material layer, measured according to JC/T956 standard, and has the unit of cubic centimeter;
step six, air permeability test
6.1, coating a layer of piston grease on the second conical surface of the lower cylinder body provided with the test material layer, then inserting the lower part of the lower cylinder body into a conical grinding opening at the top end of the pressure gauge, and rotating for 1-2 circles, as shown in FIG. 7;
6.2, opening the miniature 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; starting timing when the meniscus of the liquid in the pressure gauge descends to a first scale line, stopping timing when the meniscus of the liquid descends to a second scale line, recording the time required by the liquid level from the first scale line to the second scale line, and recording in seconds; and recording the temperature during the test; preparing a test material layer again in each ventilation test;
example verification:
the P.O 42.5 cement has qualified stability, the flexural strength and the compressive strength of 5.7MPa and 32.5MPa in three days, and the flexural strength and the compressive strength of 7.1MPa and 45.2MPa in twenty-eight days.
Cement specific surface area standard sample: the specific surface area value is 3910cm, which is produced by China building materials headquarters, Ltd2Density value of 3.15 g/cm/g3And a void ratio of 0.500.
The porosity is 0.50, the test is carried out by using a 2000g weight, the split type air-permeable cylinder is carried out according to the test steps of the invention, and the porosity is adjusted by increasing or decreasing 0.02 of the traditional air-permeable cylinder, so that the optimal specific surface area is obtained and measured. During the air permeability test, the preparation of the test material layer is as compact as possible, so that the specific surface area of cement is closer to the true value.
Results were obtained using a split-type gas-permeable cylinder under essentially the same test conditions (4470 cm)2G), difference in secondary test results1.1 percent; measurement of a conventional vented cylinder (4540 cm)2In terms of/g), the results of the secondary tests differ by 1.5%. The absolute value of the relative error is 0.78%. The test time of using split type ventilative drum is about using traditional ventilative drum 60%, can effectively save time, promotes inspection work efficiency.
In the above examples, the cement specific surface area test method based on the split type breathable cylinder is an improvement of the national standard method. The national standard method determines the void ratio and then determines the quality of the sample, and the method determines the quality of the sample and then determines the void ratio. Therefore, the cement specific surface area test method based on the split type breathable cylinder has the following advantages:
1. the problem that the void ratio of different tested materials is not easy to determine is solved.
2. Air leakage is avoided during use, and the sealing performance is good.
3. The sample preparation is more convenient, the sample preparation can be carried out without considering the void ratio, and the obvious advantages of rapid and efficient sample preparation are achieved.
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. The strength is high, and deformation which influences the test cannot be generated.
6. The practice proves that the device has the capability of testing and reliably testing under the test conditions of various models of manual Boehringer and automatic Boehringer.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A cement specific surface area test method based on a split type breathable cylinder is characterized by comprising the following steps: the specific surface area of the cement is measured by adopting a split type breathable cylinder, the split type breathable 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 barrel is provided with the second toper face down, the inside of barrel is provided with the boss that is used for supporting the perforated plate down, the boss is located the lower part of barrel down, the upper portion of barrel is provided with down with internal thread assorted external screw thread, the lower part of going up the barrel is connected with the upper portion screw thread of barrel down.
2. The method for testing the specific surface area of the cement based on the split type breathable cylinder is characterized by comprising the following steps of:
step one, measuring the density of cement
Measuring the density of the measured sample according to GB/T208 standard;
step two, air leakage inspection
The upper end of the split type ventilating cylinder is plugged by a rubber plug and connected to a pressure gauge; pumping gas from one arm of the pressure gauge by using a gas pumping device, and then closing the valve; observing whether air leakage occurs; if air leakage is found, the piston can be sealed by piston grease;
step three, preparation of sample layer
3.1, weighing the measured material m1，m1Greater than the required sample size;
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 flatly placing and pressing the edge of the filter paper; weighing a sample amount to be accurate to 0.001 g; pouring the assembled split type breathable cylinder; tapping the edge of the split type breathable cylinder to enable the surface of the cement layer to be flat; putting a piece of filter paper, uniformly tamping the sample by a tamper until the supporting ring of the tamper is 1-2mm higher than the top edge of the cylinder, rotating for 1-2 circles, slowly taking out the tamper, and weighing the total mass m2；
Wherein, in step 3.1, when the sample amount is not enough to press the sample to the position specified in step 3.2, the sample amount is allowed to be changed; adjusting the sample amount according to the standard that a 2000g weight compacts the sample to a position higher than the position specified in the step 3.2; in the step 3.2, weighing the sample amount determined in the step 3.3 to be accurate to 0.001g, and pouring the sample amount into the assembled split type breathable cylinder;
3.3, fixing the split type breathable cylinder slowlyUnscrewing the upper cylinder body, removing the redundant sample on the surface of the lower cylinder body by using a small scraper, cleaning the sample by using a small brush, putting back the filter paper, slowly assembling the split type breathable cylinder, and weighing the total mass m at the moment3；
3.4 Filter paper on perforated plate
A round filter paper sheet with smooth edges, wherein a new filter paper sheet is needed for each measurement;
step four, determining the sample amount
The sample amount is calculated according to the formula: m is m1-m2+m3；
m is the sample amount of the sample to be measured, and the unit is gram;
m1weighing the quality of a sample to be measured, wherein the unit is gram;
m2the mass of the split type breathable cylinder filled with a tested sample is gram;
m3the mass of the split type breathable cylinder for scraping the redundant tested sample is gram;
or
m＝m4-m5；
m4The weight of the lower cylinder filled with the tested sample is in grams;
m5the weight of the lower cylinder without the tested sample is expressed in grams;
step five, determining the void ratio
The void ratio is calculated according to the formula: 1-m/(ρ V);
epsilon is the void fraction of the test material layer;
m is the sample amount of the sample to be measured, and the unit is gram;
ρ is the sample density in grams per cubic centimeter;
v is the volume of the test material layer, measured according to JC/T956 standard, and has the unit of cubic centimeter;
step six, air permeability test
6.1, coating a layer of piston grease on the second conical surface of the lower cylinder body provided with the test material layer, then inserting the lower part of the lower cylinder body into a conical grinding opening at the top end of the pressure gauge, and rotating for 1-2 circles;
6.2, opening the miniature 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; starting timing when the meniscus of the liquid in the pressure gauge descends to a first scale line, stopping timing when the meniscus of the liquid descends to a second scale line, recording the time required by the liquid level from the first scale line to the second scale line, and recording in seconds; and recording the temperature during the test; the test bed should be prepared anew for each venting test.
3. The cement specific surface area test method based on the split type breathable cylinder is characterized by comprising the following steps of: m is10.02-0.03g more than the required sample amount.
4. The cement specific surface area test method based on the split type breathable cylinder is characterized by comprising the following steps of: the sample amount was adjusted by compacting the sample with a 2000g weight to a height of 1-2mm above the position specified in step 2.2.
5. The cement specific surface area test method based on the split type breathable cylinder is characterized by comprising the following steps of: the volume of the lower cylinder was calibrated using mercury.
6. The cement specific surface area test method based on the split type breathable cylinder is characterized by comprising the following steps of: the roughness of the inner wall of the upper cylinder is not more than Ral.6, the roughness of the first conical surface is not more than Ral.6, the roughness of the inner wall of the lower cylinder is not more than Ral.6, and the roughness of the second conical surface is not more than Ral.6.
7. The cement specific surface area test method based on the split type breathable cylinder is characterized by comprising the following steps of: the inner diameter of the upper part of the lower barrel is equal to that of the upper barrel, and the inner diameter of the upper barrel is 12.70 mm.
8. The cement specific surface area test method based on the split type breathable cylinder is characterized by comprising the following steps of: the second conical surface and the first conical surface are arranged in a coplanar manner.
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| CN114544462A (en) * | 2022-03-09 | 2022-05-27 | 广西建宏工程科技有限公司 | Cement specific surface area measuring device |
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| 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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| 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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114544462A (en) * | 2022-03-09 | 2022-05-27 | 广西建宏工程科技有限公司 | Cement specific surface area measuring device |
| CN114544462B (en) * | 2022-03-09 | 2024-05-03 | 陕西交控混凝土有限公司 | Cement specific surface area measuring device |
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| CN112414909B (en) | 2024-03-15 |
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