CN112284793A - Nodular cast iron pipe aluminate cement mortar lining sampling equipment and identification method - Google Patents
Nodular cast iron pipe aluminate cement mortar lining sampling equipment and identification method Download PDFInfo
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- CN112284793A CN112284793A CN202011047502.1A CN202011047502A CN112284793A CN 112284793 A CN112284793 A CN 112284793A CN 202011047502 A CN202011047502 A CN 202011047502A CN 112284793 A CN112284793 A CN 112284793A
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- cement mortar
- iron pipe
- aluminate cement
- lining
- cast iron
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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
- G01N1/02—Devices for withdrawing samples
- G01N1/04—Devices for withdrawing samples in the solid state, e.g. by cutting
- G01N1/08—Devices for withdrawing samples in the solid state, e.g. by cutting involving an extracting tool, e.g. core bit
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/22—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material
- G01N23/223—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material by irradiating the sample with X-rays or gamma-rays and by measuring X-ray fluorescence
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/38—Concrete; ceramics; glass; bricks
- G01N33/383—Concrete, cement
Abstract
The invention discloses a ductile cast iron pipe aluminate cement mortar lining sampling device which comprises a protection box, wherein an installation frame is installed on one side in the protection box, a polishing wheel is connected to the installation frame in a rotating mode, a driving motor is installed on one side of the bottom in the protection box, the tail end of an output shaft of the driving motor is connected with the polishing wheel through a driving belt, two guide rails are fixed on the other side in the protection box, and sliding blocks are installed on one sides of the two guide rails; a method for identifying an aluminate cement mortar lining of a nodular cast iron pipe comprises the following steps. The method extracts and samples cement in a clean slurry layer in the cement mortar lining of the nodular cast iron pipe, performs related treatment, reduces the interference of sand and binding water in the lining, finally adopts an X-ray fluorescence spectrometry method or a chemical detection method to determine the content of aluminum oxide, and identifies whether the lining is the aluminate cement mortar lining or not through the content threshold method of the aluminum oxide.
Description
Technical Field
The invention relates to the technical field of pipeline cement mortar linings, in particular to equipment for sampling an aluminate cement mortar lining of a nodular cast iron pipe and an identification method.
Background
The ductile iron pipe is used as an excellent drainage pipe material and is widely applied to drainage pipe network engineering. Compared with other pipes, the nodular cast iron pipe has the advantages of excellent mechanical property, excellent corrosion resistance, good sealing property, low accident rate, low leakage rate and the like, and is widely used in drainage pipe network construction projects in south China, east China and the like.
Compared with the silicate cement mortar lining, the aluminate cement mortar lining does not precipitate calcium hydroxide but generates aluminum hydroxide gel in the hydration process, the gel material and the hydration product have high stability, and the high-concentration aluminum ions on the surface of the aluminate cement mortar lining can inhibit the reproduction and growth of the thiobacillus in the sewage and have strong resistance to the corrosion of the biological acid.
In view of the above advantages of aluminate cement, high alumina cement lining is generally selected as inner corrosion protection in sewage engineering according to application environment. However, since the price of the aluminate cement is several times that of the portland cement, in recent years, in order to reduce the cost, the aluminate cement which does not meet the standard regulation is adopted in the market to be used as a lining raw material for production, and even more, the portland cement is adopted to serve as the aluminate cement, so that the corrosion of client pipe networks in the use of sewage engineering is serious for as short as several years.
The Al in the aluminate cement is specified in the national standard GB/T201 aluminate cement2O3The content is more than or equal to 50 percent. Therefore, the main technical index for identifying whether the cement used by the cement mortar lining of the ductile cast iron pipe is aluminate cement is to judge the content of aluminum oxide in the cement. The cement mortar lining of the spherical pipe has certain strength after being maintained, contains sand and binding water, has different sand-cement ratio and water-cement ratio according to different production modes and calibers, does not have a technology for distinguishing which cement raw material is adopted by the lining of the nodular cast iron pipe in the current market, and has certain difficulty in identifying whether the cement mortar lining is aluminate cement or not compared with the cement raw material.
Therefore, a sampling device and an identification method for an aluminate cement mortar lining of a nodular cast iron pipe are researched to solve the problems.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a ductile iron pipe aluminate cement mortar lining sampling device and an identification method.
In order to achieve the purpose, the invention adopts the following technical scheme:
a sampling device for an aluminate cement mortar lining of a nodular cast iron pipe comprises a protection box, wherein an installation rack is installed on one side in the protection box, the mounting rack is rotatably connected with a polishing wheel, one side of the bottom in the protection box is provided with a driving motor, the tail end of an output shaft of the driving motor is connected with the polishing wheel through a driving belt, two guide rails are fixed on the other side in the protection box, sliding blocks are installed on one sides of the two guide rails, a moving plate is fixed between the two sliding blocks, a hydraulic cylinder is fixedly penetrated at one side of the protection box, the tail end of a piston rod of the hydraulic cylinder is fixed at one side of the movable plate, one side of the movable plate is fixed with an installation plate, one side of the installation plate is provided with an installation groove, a clamping mechanism is arranged in the installation groove, the middle of the lower end of the protection box is connected with a blanking pipe, and a storage box is arranged at the lower end of the blanking pipe.
Preferably, the clamping mechanism comprises a screw rod sleeved on the three side walls of the mounting plate in a threaded manner, a rotating wheel is fixed at one end of the screw rod, a clamping plate is rotatably connected to the other end of the screw rod, and a rubber pad is fixed on one side of the clamping plate.
Preferably, the lower end of the blanking pipe is sleeved with a sealing cover, and the lower end of the blanking pipe and the storage box are correspondingly arranged.
Preferably, support columns are fixed to four corners of the lower end of the protection box, and cushion blocks are fixed to the lower ends of the support columns.
Preferably, an opening is formed in one side of the protection box, and a sealing door is hinged to the side wall of the opening.
The method for identifying the aluminate cement mortar lining of the nodular cast iron pipe comprises the following steps:
s1, cleaning dust and impurities on the surface of a cement mortar lining of the nodular cast iron pipe prepared by a centrifugal process;
s2, fixing the lining by using a clamping mechanism, fully polishing by using a polishing wheel, and taking a net slurry layer on the surface of the lining as a test sample;
s3, sieving the prepared test sample, and collecting a powder sample under the sieve;
s4, burning the collected undersize powder sample at high temperature for 30min, taking out, immediately placing into a dryer to cool to room temperature, weighing, repeating to constant weight, namely reaching constant weight when the difference between two successive weighing is less than 0.0005g, and collecting the constant-weight powder sample as a detection sample;
s5, determining the content of aluminum oxide in the detection sample collected in the step S4 by adopting a chemical detection method (GB/T205) or an X-ray fluorescence spectrometry method (GB/T21114);
s6, determining and identifying the alumina content threshold of the aluminate cement mortar lining, and identifying whether the nodular cast iron pipe cement mortar lining is the aluminate cement mortar lining by a threshold method.
Preferably, the sampling method of the net slurry layer in the step S1 is a random multipoint mode, and the sample mass is more than or equal to 10 g.
Preferably, the sieve in step S3 has a pore size of 75 μm, i.e., a 200-mesh sieve.
Preferably, the high-temperature ignition temperature in the step S4 is 900 ℃ to 950 ℃.
Preferably, in the step S6, the alumina content threshold is equal to or greater than 45%, and the lining is determined to be high alumina cement mortar.
According to the invention, when sampling is required, the corresponding lining is placed in the mounting groove, three screws are driven to rotate by rotating three rotating wheels on three sides, stable clamping of the clamping plate is realized, the piston rod is driven to stretch by the hydraulic cylinder, the sliding block is moved on the guide rail, the clamped lining is attached to one side of the polishing wheel, the driving motor is started, the driving belt is driven to rotate by the driving motor through the rotation of the output shaft, and then the rotation of the polishing wheel is realized, so that continuous polishing is realized, a polished powder sample falls into the blanking pipe, the sealing cover is opened during sampling, and the powder sample falls into the storage box for next operation.
The identification method extracts and samples cement in a clean slurry layer in the cement mortar lining of the nodular cast iron pipe, performs related treatment, reduces the interference of sand and binding water in the lining, finally adopts an X-ray fluorescence spectrometry method or a chemical detection method to determine the content of aluminum oxide, and identifies whether the lining is the aluminate cement mortar lining or not through the content threshold method of the aluminum oxide.
The sampling device can ensure that a proper sample is obtained, effectively improves the stability and accuracy of detection, can quickly sample, can adapt to samples of different sizes, and has the advantages of high accuracy, small impurity interference, good stability and strong reliability.
Drawings
FIG. 1 is a schematic view of the internal structure of an aluminate cement mortar lining sampling device for nodular cast iron pipes according to the present invention;
FIG. 2 is a schematic external structural view of an aluminate cement mortar lining sampling device for a nodular cast iron pipe according to the present invention;
FIG. 3 is a schematic structural view of a clamping mechanism of the nodular cast iron pipe aluminate cement mortar lining sampling device provided by the invention;
FIG. 4 is an enlarged view of the structure at the A position of the nodular cast iron pipe aluminate cement mortar lining sampling device provided by the invention.
In the figure: the device comprises a grinding wheel 1, a protection box 2, a driving belt 3, a driving motor 4, a mounting frame 5, a supporting column 6, a blanking pipe 7, a sealing cover 8, a material storage box 9, a sliding block 10, a guide rail 11, a moving plate 12, a hydraulic cylinder 13, a clamping plate 14, a mounting groove 15, a mounting plate 16, a rotating wheel 17, a screw rod 18, a rubber pad 19 and a sealing door 20.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
The method for identifying the sampling equipment for the alumina cement mortar lining of the nodular cast iron pipe adopts several kinds of CA50 aluminate cement with known alumina content and ordinary portland cement as the raw materials of the cement mortar lining, and the nodular cast iron pipe is coated and lined according to different sand-cement ratios respectively, wherein the alumina content and the sand-cement ratio in the raw materials of the cement in each embodiment are shown in Table 1.
The alumina content and the sand-to-ash ratio of the raw material cement in the example of Table 1
| Numbering | Type of cement | Alumina content in cement raw material | Sand to ash ratio |
| Example 1 | CA50 aluminate cement | 50.13％ | 1.2:1 |
| Example 2 | CA50 aluminate cement | 52.79％ | 1.5:1 |
| Example 3 | CA50 aluminate cement | 55.72％ | 2.0:1 |
| Example 4 | Ordinary portland cement | 6.98％ | 1.2:1 |
In each of the examples, the following steps were carried out:
(1) for the cement mortar lining of the nodular cast iron pipe prepared by the centrifugal process, cleaning dust and impurities on the surface of the cement mortar lining, fixing the lining by using a clamping mechanism, fully polishing by using a polishing wheel, and taking a clear slurry layer on the surface of the lining as a test sample of about 10 g;
(2) pouring the test sample prepared in the step (1) into a 200-mesh screen for sieving, and collecting a powder sample under the sieve;
(3) adjusting the temperature of a muffle furnace to 900 ℃, putting the powder sample prepared in the step (2) into the muffle furnace for high-temperature ignition, taking out the powder sample at intervals of half an hour for cooling, weighing until the weight is constant, collecting the ignited detection sample, and putting the detection sample into a dryer for storage;
(4) determining the content of aluminum oxide according to the national standard GB/T205 aluminate cement chemical analysis method;
(5) and according to the determined content of the aluminum oxide, whether the lining is an aluminate cement mortar lining is judged according to the threshold line of more than or equal to 45 percent.
In the invention, when sampling is needed, a corresponding lining is placed in the mounting groove 15, three screws 18 are driven to rotate by rotating three rotating wheels 17 on three sides, stable clamping of the clamping plate 14 is realized, the piston rod is driven to stretch by using the hydraulic cylinder 13, the sliding block 10 is moved on the guide rail 11, the clamped lining is attached to one side of the polishing wheel 1, the driving motor 4 is started, the driving belt 3 is driven to rotate by the driving motor 4 through the rotation of the output shaft, and then the rotation of the polishing wheel 1 is realized, so that continuous polishing is realized, a polished powder sample falls into the blanking pipe 7, the sealing cover 8 is opened during sampling, and the powder sample falls into the storage box 9 for next operation.
The detection value and the identification result of the aluminum oxide content of each example are shown in Table 2.
TABLE 2 detection values of alumina
| Numbering | Aluminum oxide detection value | Identification result |
| Example 1 | 48.99％ | CA50 aluminate cement |
| Example 2 | 51.03％ | CA50 aluminate cement |
| Example 3 | 54.28％ | CA50 aluminate cement |
| Example 4 | 6.78％ | Ordinary portland cement |
The measured values of the alumina content and the precision of the initial content in each example are shown in Table 3
TABLE 3 comparison of precision
The test results show that the method reduces the interference of the sand and the binding water in the lining, and has the advantages of high accuracy, small impurity interference, good stability and strong reliability.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical scope of the present invention and the equivalent alternatives or modifications according to the technical solution and the inventive concept of the present invention within the technical scope of the present invention.
Claims (10)
1. The utility model provides a nodular cast-iron pipe aluminate cement mortar inside lining sampling equipment, includes guard box (2), its characterized in that: mounting bracket (5) is installed to one side in guard box (2), it has abrasive wheel (1) to rotate to be connected on mounting bracket (5), driving motor (4) are installed to bottom one side in guard box (2), the output shaft end of driving motor (4) is connected through driving band (3) and abrasive wheel (1), opposite side in guard box (2) is fixed with two guide rails (11), slider (10) are all installed to one side of two guide rails (11), be fixed with movable plate (12) between two slider (10), one side of guard box (2) is run through and is fixed with pneumatic cylinder (13), the piston rod end of pneumatic cylinder (13) is fixed in one side of movable plate (12), one side of movable plate (12) is fixed with mounting panel (16), one side of mounting panel (16) is equipped with mounting groove (15), be equipped with fixture in mounting groove (15), the middle part of the lower end of the protection box (2) is connected with a blanking pipe (7), and the lower end of the blanking pipe (7) is provided with a storage box (9).
2. The ductile cast iron pipe aluminate cement mortar lining sampling device as claimed in claim 1, wherein the clamping mechanism comprises a screw rod (18) which is in threaded sleeve joint with three side walls of the mounting plate (16), one end of the screw rod (18) is fixed with a rotating wheel (17), the other end of the screw rod (18) is rotatably connected with a clamping plate (14), and one side of the clamping plate (14) is fixed with a rubber pad (19).
3. The ductile iron pipe aluminate cement mortar lining sampling device as claimed in claim 1, wherein the lower end of the blanking pipe (7) is sleeved with a sealing cover (8), and the lower end of the blanking pipe (7) is arranged corresponding to the storage box (9).
4. The ductile cast iron pipe aluminate cement mortar lining sampling device as claimed in claim 1, wherein four corners of the lower end of the protection box (2) are fixed with support columns (6), and the lower ends of the support columns (6) are fixed with cushion blocks.
5. The ductile cast iron pipe aluminate cement mortar lining sampling device according to claim 1, characterized in that one side of the protection box (2) is provided with an opening, and the side wall of the opening is hinged with a sealing door (20).
6. The method for identifying the aluminate cement mortar lining of the nodular cast iron pipe is characterized by comprising the following steps of:
s1, cleaning dust and impurities on the surface of a cement mortar lining of the nodular cast iron pipe prepared by a centrifugal process;
s2, fixing the lining by using a clamping mechanism, fully polishing by using a polishing wheel 1, and taking a clean slurry layer on the surface of the lining as a test sample;
s3, sieving the prepared test sample, and collecting a powder sample under the sieve;
s4, burning the collected undersize powder sample at high temperature for 30min, taking out, immediately placing into a dryer to cool to room temperature, weighing, repeating to constant weight, namely reaching constant weight when the difference between two successive weighing is less than 0.0005g, and collecting the constant-weight powder sample as a detection sample;
s5, determining the content of aluminum oxide in the detection sample collected in the step S4 by adopting a chemical detection method (GB/T205) or an X-ray fluorescence spectrometry method (GB/T21114);
s6, determining and identifying the alumina content threshold of the aluminate cement mortar lining, and identifying whether the nodular cast iron pipe cement mortar lining is the aluminate cement mortar lining by a threshold method.
7. The method for identifying the ductile cast iron pipe aluminate cement mortar lining as claimed in claim 6, wherein the sampling method of the net slurry layer in the step S1 is a random multipoint mode, and the sample mass is more than or equal to 10 g.
8. The method for identifying the ductile cast iron pipe aluminate cement mortar lining as claimed in claim 6, wherein the sieve of step S3 has a size of 75 μm, i.e. 200 mesh.
9. The method for identifying the ductile cast iron pipe aluminate cement mortar lining as claimed in claim 6, wherein the high temperature ignition temperature in the step S4 is 900 ℃ -950 ℃.
10. The method for identifying the ductile cast iron pipe aluminate cement mortar lining as claimed in claim 6, wherein the alumina content threshold value of more than or equal to 45% in the step S6 is determined as the high alumina cement mortar lining.
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Cited By (1)
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| CN115229967A (en) * | 2022-05-23 | 2022-10-25 | 安钢集团永通球墨铸铁管有限责任公司 | Production process of thin-wall lining of nodular cast iron pipe |
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