This standard specifies the tools, parts, quantities and steps for cement sampling. This standard is applicable to the sampling, quality control and quality supervision sampling of factory cement. GB 12573-1990 Cement Sampling Method GB12573-1990 Standard download and decompression password: www.bzxz.net

12 | |tt | Strength (MPa)
3d is not less than
28d is not less than
not greater than
final setting time (hour: minute)
not greater than||tt ||Excellent products
Equal products
Table 1
Qualified products
Portland cement; Ordinary slag Portland cement: Portland cement; Ordinary slag silicon Salt cement; Portland cement; Composite pozzolanic Portland water Portland cement; Composite pozzolanic Portland water various types of general Portland cement; lime mud; fly ash Portland cement; Lime mud; fly ash Portland cement stone Portland cement
cement
32.0
56.0
1.1R
6:30|| tt||28.0
56.0
1.1R
6:30
Portland cement
26.0
46.0||tt ||1.1R
6:30
Cement
22.0
46.0
1.1R
8:00
Comply with the
technical requirements of various types
general cementwwW.bzxz.Net
Note: R in the table is the average 28-day compressive strength of cement of the same type and grade last month, and MPac is averaged with at least 20 numbers . If there are less than 20 numbers, two or three months can be combined for calculation. For cement No. 625 and above, the requirement that the 28-day compressive strength is not greater than 1.1R is not specified. 7.4 The quality management, certification, statistics and supervision of cement products shall be carried out in accordance with relevant regulations. Appendix A
(Standard Appendix)
Evaluation Principles of Cement Standard Recommendation Level
A1 Cement standard level is divided into three levels: international advanced level, international general level and domestic general level. A1.1 International advanced level standards refer to the comprehensive level of standards reaching the international advanced current standard level. A1.2 International general level standard means that the comprehensive level of the standard reaches the international general current standard level. A1.3 Domestic general level standards refer to my country's current standard level where the comprehensive level of standards does not reach the above two levels.
A2 standard comprehensive level refers to the comprehensive evaluation of various requirements related to product quality stipulated in the standard; any key indicator related to product quality does not reach the international advanced standard level or international general standards If it is water level, it cannot be considered to be at the internationally advanced level or the international general level. The comparison objects of A3 standard level are current international standards or advanced foreign standards. Confirmation of standards without comparison objects is carried out by comparing with similar international and foreign standards, or by comparing with collected foreign objects. Additional notes:
This standard was first released on April 17, 1992. This standard is under the jurisdiction of the National Cement Standardization Technical Committee. This standard is drafted by the Cement Research Institute of the China Academy of Building Materials, the Standardization Research Institute of the National Building Materials Administration, and the China Cement Product Quality Certification Committee.
The main drafters of this standard: Tong Sanduo, Tang Yaolin, Yang Jidian, Wang Wenyi. 3. "Cement Sampling Methods" GB12573--901 Subject Content and Scope of Application
This standard specifies the tools, parts, quantities and steps for cement sampling. 1. Cement 13
This standard applies to the sampling of factory cement. Quality control and quality supervision sampling should also be adopted accordingly. 2 Terms
2.1
Manual sampling is a method of collecting cement samples using manually operated sampling tools. 2.2 Mechanical sampling is a method of collecting cement samples using automatic sampling equipment. 2.3 Continuous sampling is a method of taking out cement samples without interruption. 2.4 Inspection batch refers to a batch of unit products collected for sampling inspection. 2.5 The number represents the code of the inspection batch.
2.6 samples of the specified amount of cement taken from one location. 2.7 Mixed sample is a sample prepared after thorough mixing of all cement samples obtained within a number. 2.8 The mixed sample of the test sample and the sealed sample is divided into two parts, one part is the test sample, which is used for quality inspection of the manufactured cement; the other part is the sealed sample, which is sealed and stored for re-inspection and arbitration. 2.9 The split samples are connected according to each 1/10 number within a number, and are used for the quality test of the split samples. 2.10 General cement is cement used in general civil construction projects. 3 Sampling
3.1 Sampling Tools
3.1.1 Mechanical Sampler
Mechanical sampling uses the automatic continuous sampler shown in Figure B1, and other mechanical sampling devices that can obtain representative samples. Can also be used.
3.1.2 Manual sampler
α bagged cement: Use the sampling tube shown in Figure B2. b. Bulk cement: Use the sampling tube shown in Figure B3. Other manual sampling tools capable of obtaining representative samples may also be used. 3.2 Sampling site
α． In cement transportation pipelines (suitable for mechanical sampling). b. Bagged cement yard.
c. Bulk cement unloading place or cement transportation equipment. Note: Sampling should not be taken in heavily polluted environments. 3.3 Number of samples
3.3.1 Mixed samples
The number of samples taken should comply with the provisions of each corresponding cement standard. 3.3.2 Segmentation sample
α. Bagged cement: Take at least 6kg from a bag for every 1/10 number. b. Bulk cement: take at least 6kg within 5 minutes for every 1/10 number. 3.4 Sampling steps
3.4.1 Automatic sampler sampling: Use the sampling device specified in 3.1.1- for sampling. The device is generally installed in the pipeline as close as possible to the cement packaging machine, takes out the sample from the flowing cement flow, and then places the sample into a clean, dry, and non-contaminated container.
Part 1 Testing Method Standard for Main Building Materials 14
3.4.2 Sampling tube sampling: Use the sampling tube in Figure B2 for sampling. Randomly select more than 20 different parts, insert the sampling tube into the cement to an appropriate depth, press the air hole with your thumb, and carefully pull out the sampling tube. Place the collected samples into a clean, dry, and non-contaminated container.
3.4.3 Sampling with a trough-shaped tubular sampler: When the depth of the cement taken does not exceed 2m, the trough-shaped tubular sampler in Figure B3 is used for sampling. By turning the control switch of the inner tube of the sampler, insert the cement into a certain depth at the appropriate position, and carefully pull it out after closing. Place the collected samples into a clean, dry, and non-contaminated container. 3.5 Sample Preparation
3.5.1 Sample Dividing
A bifurcater can be used to divide the sample into the specified amount required by the standard one or more times. 3.5.2 Test samples and sealed samples
Pass the cement mixture sample taken for each number through a 0.9mm square hole sieve and divide it equally into test samples and sealed samples. 3.5.3 Split samples
The 10 split samples taken from each number shall pass through a 0.9mrm square hole sieve respectively and be tested according to Appendix A, and shall not be mixed.
Note: The sample must not be mixed with debris or agglomerated. 3.6 Packaging and storage of samples
3.6.1 After the samples are obtained, they should be stored in sealed metal containers with seals. The container should be clean, dry, moisture-proof, airtight, not easily damaged, and should not react with cement.
3.6.2 Sealed samples should be kept sealed for three months. Test samples and split samples should also be properly kept. 3.6.3 The container for storing samples should be stamped with a clear, hard-to-erasure seal with the serial number, sampling time, location, and personnel in at least one place. If there is only one mark, it should be on the wall of the container. 3.6.4 Sealed samples should be stored in a dry and ventilated environment. 3.7 Sampling Form
After the sample is obtained, the sampling operator shall fill in the sampling form as shown in the table below. ×××Cement Plant Sampling Sheet
Cement Number
A1 Test Method
Cement Variety and Label
Sampling Date
Appendix A
Quality test of split samples
(supplement)
Signature of the sampler
Note
The quality test of split samples shall be carried out according to the corresponding technical requirements test method of general cement. Other cements should also be adopted as a reference. A2 requirements
A2.1 Split sample test shall be conducted once every quarter. You can choose any variety and label. A2.2 The quality test results of split samples must meet the technical requirements of cement standards. , water
A2.3 The split sample should be tested immediately after being obtained. All samples must be completed within one week. Mud
15
A2.4. When the split sample test results are lower than the technical requirements of cement, or the 28-day compressive strength variation coefficient of cement is greater than 6%, it should be conducted twice every quarter; when it is still lower than the technical requirements, or the variation coefficient is greater than 6% time, it will be conducted once a month. | |tt | | A2.5 |
A2.6 When increasing the test, cement of the same type and grade is generally used. Calculation of coefficient of variation of A3
A3.1 Average value of split sample x
x:
In the formula, X,
compressive strength value of split sample (MPa).
A3.2 Standard deviation of split samples S
The standard deviation S of split samples is calculated according to formula (A2): S
A3.3 Coefficient of variation of split samples Cv
10
X
104
Z(X; - ) Calculation: Cy
strong
degree
split sample
1
2
3
4||tt ||5
A4 calculation example
A4.1 example 1
Compressive strength (MPa)
3d
30.1
17.7
25.8
26.3
23.3
28d
51.3
41.8
46.5
48.8|| tt||42.0
S
X
x100
strength
split sample
6
7||tt ||8
9
10
The test results of No. 425 slag cement split sample from a certain factory are shown in Table A1. Average value of segmented samples X28:
|tt||Compressive strength (MPa)
3d
23.3
27.4
21.3
26.6
19.6||tt| |28d
42.1
47.6
41.7
48.5
41.9
(51.3+41.8+46.5+48.8+42.0+42.1+ 47.6+41.7+48.5+41.9)45.2(MPa)
16
Part 1 Testing Methods for Main Building Materials Standard Split Sample Standard Deviation S28:
1
S28
N
-45.2)2+ (47.6 - 45.2)2 + (41.7 - 45.2)2 + (48. 5 - 45.2)2+ (41.9 - 45.2)2)
3. 70(MPa)||tt| |Segmentation coefficient of variation Cv (%):
_3.70×100
S28 ×100 =
Cy
X28
45.2||tt ||=8.19
The coefficient of variation of the 28-day compressive strength of this plant is greater than 6%, and the split sample test should be changed to twice per season. Appendix B
Cement sampler
(reference part)
B1 automatic continuous sampler
The automatic continuous sampler is mainly suitable for automatic continuous sampling of cement products and raw materials. It is also suitable for automatic continuous sampling of other powdery materials.
B1.1 structure
The structure of the automatic continuous sampler is shown in Figure B1. B1.2 Technical Requirements
B1.2.12 Mixing barrel specifications are divided into two types: Type A $500mm×225mm, Type B 300mm×150mm. B1.2.2 The maximum loading capacity of the mixing barrel: 15kg for type A and 5kg for type B (material density is not less than 28g/cm2). B1.2.3 Motor power: 120W.
B1.2.4 The sampling volume should be adjustable, and the adjustment range is 0 ~8kg/h.
B1.2.5 The sampling regulating valve and the dumping door should be flexible.
B1.2.6 The sealing performance around and in all parts of the dump door is good, and there is no obvious ash leakage.
Figure B1 Automatic continuous sampler
1—Inlet; 2—Adjusting handle; 3 Mixing simple; 4 Motor: 5—Counterweight hammer; 6—Discharge port
B2 bagged cement sampler
Bagged cement sampling uses the sampling tube as shown in Figure B2.
B3 Bulk Cement Sampler
Bulk cement sampling uses the sampling tube as shown in Figure B3. 32-
T
Figure B2 bagged cement sampling tube
1—air hole; 2-handle
Material: brass air hole and wall thickness size customized additional instructions :
This standard is proposed by the National Bureau of Building Materials Industry. This standard is under the technical jurisdiction of the China Academy of Building Materials. Pipe
Water
40t
Mud
Assembled sampler
Figure B3 Bulk cement sampling pipe
L = 1000 ~2000|| tt||This standard is drafted by the Standardization Research Institute of the National Bureau of Building Materials Industry. The main drafters of this standard are Fang Derui and Wei Congjiu. 4． "Cement standard consistency water consumption, setting time, stability test method" GB1346-89
1 Subject content and scope of application
17
This standard specifies the water consumption, setting time and stability of cement standard consistency. Test method for setting time and volume stability caused by free calcium oxide.
0+42.1+47.6+41.7+48.5+41.9)45.2(MPa)
16
Part 1 Testing Methods for Main Building Materials Standard Split Sample Standard Deviation S28:
1|| tt||S28
N
2+(42.1-45.2)2+ (47.6 - 45.2)2 + (41.7 - 45.2)2 + (48. 5 - 45.2)2+ (41.9 - 45.2)2)
3. 70(MPa)
Split sample variation coefficient Cv (%):
_3.70×100
S28 ×100 =
Cy
X28
45.2
=8.19
The coefficient of variation of the 28-day compressive strength of this plant is greater than 6%, and the split sample test should be changed to twice per season. Appendix B
Cement sampler
(reference part)
B1 automatic continuous sampler
The automatic continuous sampler is mainly suitable for automatic continuous sampling of cement products and raw materials. It is also suitable for automatic continuous sampling of other powdery materials.
B1.1 structure
The structure of the automatic continuous sampler is shown in Figure B1. B1.2 Technical Requirements
B1.2.12 Mixing barrel specifications are divided into two types: Type A $500mm×225mm, Type B 300mm×150mm. B1.2.2 The maximum loading capacity of the mixing barrel: 15kg for type A and 5kg for type B (material density is not less than 28g/cm2). B1.2.3 Motor power: 120W.
B1.2.4 The sampling volume should be adjustable, and the adjustment range is 0 ~8kg/h.
B1.2.5 The sampling regulating valve and the dumping door should be flexible.
B1.2.6 The sealing performance around and in all parts of the dump door is good, and there is no obvious ash leakage.
Figure B1 Automatic continuous sampler
1—Inlet; 2—Adjusting handle; 3 Mixing simple; 4 Motor: 5—Counterweight hammer; 6—Discharge port
B2 bagged cement sampler
Bagged cement sampling uses the sampling tube as shown in Figure B2.
B3 Bulk Cement Sampler
Bulk cement sampling uses the sampling tube as shown in Figure B3. 32-
T
Figure B2 bagged cement sampling tube
1—air hole; 2-handle
Material: brass air hole and wall thickness size customized additional instructions :
This standard is proposed by the National Bureau of Building Materials Industry. This standard is under the technical jurisdiction of the China Academy of Building Materials. Pipe
Water
40t
Mud
Assembled sampler
Figure B3 Bulk cement sampling pipe
L = 1000 ~2000|| tt||This standard is drafted by the Standardization Research Institute of the National Bureau of Building Materials Industry. The main drafters of this standard are Fang Derui and Wei Congjiu. 4． "Water consumption, setting time and stability test method for cement standard consistency" GB1346-89
1 Subject content and scope of application
17
This standard specifies the water consumption, setting time and stability of cement standard consistency. Test method for setting time and volume stability caused by free calcium oxide.
0+42.1+47.6+41.7+48.5+41.9)45.2(MPa)
16
Part 1 Testing Methods for Main Building Materials Standard Split Sample Standard Deviation S28:
1|| tt||S28
N
2+(42.1-45.2)2+ (47.6 - 45.2)2 + (41.7 - 45.2)2 + (48. 5 - 45.2)2+ (41.9 - 45.2)2)
3. 70(MPa)
Split sample variation coefficient Cv (%):
_3.70×100
S28 ×100 =
Cy
X28
45.2
=8.19
The coefficient of variation of the 28-day compressive strength of this plant is greater than 6%, and the split sample test should be changed to twice per season. Appendix B
Cement sampler
(reference part)
B1 automatic continuous sampler
The automatic continuous sampler is mainly suitable for automatic continuous sampling of cement products and raw materials. It is also suitable for automatic continuous sampling of other powdery materials.
B1.1 structure
The structure of the automatic continuous sampler is shown in Figure B1. B1.2 Technical Requirements
B1.2.12 Mixing barrel specifications are divided into two types: Type A $500mm×225mm, Type B 300mm×150mm. B1.2.2 The maximum loading capacity of the mixing barrel: 15kg for type A and 5kg for type B (material density is not less than 28g/cm2). B1.2.3 Motor power: 120W.
B1.2.4 The sampling volume should be adjustable, and the adjustment range is 0 ~8kg/h.
B1.2.5 The sampling regulating valve and the dumping door should be flexible.
B1.2.6 The sealing performance around and in all parts of the dump door is good, and there is no obvious ash leakage.
Figure B1 Automatic continuous sampler
1—Inlet; 2—Adjusting handle; 3 Mixing simple; 4 Motor: 5—Counterweight hammer; 6—Discharge port
B2 bagged cement sampler
Bagged cement sampling uses the sampling tube as shown in Figure B2.
B3 Bulk Cement Sampler
Bulk cement sampling uses the sampling tube as shown in Figure B3. 32-
T
Figure B2 bagged cement sampling tube
1—air hole; 2-handle
Material: brass air hole and wall thickness size customized additional instructions :
This standard is proposed by the National Bureau of Building Materials Industry. This standard is under the technical jurisdiction of the China Academy of Building Materials. Pipe
Water
40t
Mud
Assembled sampler
Figure B3 Bulk cement sampling pipe
L = 1000 ~2000|| tt||This standard is drafted by the Standardization Research Institute of the National Bureau of Building Materials Industry. The main drafters of this standard are Fang Derui and Wei Congjiu. 4. "Cement standard consistency water consumption, setting time, stability test method" GB1346-89
1 Subject content and scope of application
17
This standard specifies the water consumption, setting time and stability of cement standard consistency. Test method for setting time and volume stability caused by free calcium oxide.
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