This standard specifies the test specimens, test instruments, test procedures, result calculation and test report for the water absorption test of ceramic pipes. This standard is applicable to the water absorption test of ceramic pipes. GB/T 2834-1998 Test method for water absorption of ceramic pipes GB/T2834-1998 Standard download decompression password: www.bzxz.net

GB/T2834—1998
This standard is equivalent to the British standard BS65-1991 "Sintered Ceramic Pipes, Fittings and Joints" Appendix F "Water absorption and acid resistance test method for special chemical corrosion resistant pipes and fittings", and is revised on the basis of the original standard GB/T2834--1981. In this standard, the boiling time of the sample is different from that of BS65. BS65 stipulates boiling for 1h, while this standard stipulates 2h. In addition, the vacuum method is retained in the standard because it is fast and simple, and it is stipulated that the boiling method should be used for testing in case of dispute. This standard has made the following modifications to GB/T2834--1981 in terms of technical content: In 4.1, the area of ​​the sample is increased. Limit provisions. In 4.5, the test method for controversial cases is added. This standard is promoted from the date of publication and implementation, and replaces GB/T2834--1981. This standard is proposed by the State Building Materials Industry Bureau. This standard is under the jurisdiction of the National Industrial Ceramic Standardization Technical Committee, and this standard is drafted by the Shandong Industrial Ceramics Research and Design Institute of the State Building Materials Industry Bureau. The main drafters of this standard are: Li Dongsheng, Yuan Zhenqi, Ma Yan, and Wang Xian. This standard is entrusted to the Shandong Industrial Ceramics Research and Design Institute of the State Building Materials Industry Bureau for interpretation. This standard was first issued in 1981.
1 Scope
National Standard of the People's Republic of China
Test method for water absorbtion of vitrified clay pipe
Test method for water absorbtion of vitrified clay pipeGB/T 2834—1998
Replaces GB/T 2834—1981
This standard specifies the test specimens, test instruments, test procedures, result calculation and test reports for the water absorption test of ceramic tubes. This standard applies to the water absorption test of ceramic tubes. 2 Definitions
This standard adopts the following definitions.
The ratio of the mass of water that can be adsorbed by the open pores of the ceramic tube sample to the dry mass of the sample is called water absorption, expressed as a percentage. 3 Test instruments
3.1 Drying oven: can automatically control constant temperature. The temperature difference is ±5°C, and the operating temperature is above 150°C. 3.2 Balance: The maximum weighing capacity is 1kg and the sensitivity is 0.01g. 3.3 Desiccator equipped with color-changing silica gel.
3.4 ​​Vacuuming device: The vacuum degree is full Meet the test requirements. 3.5 Adjustable temperature plate electric furnace and boiling equipment. 4 Samples
4.1 Take a piece of single-sided surface area of ​​50~125cm2 from each of the three ceramic pipes as a sample, as shown in Figure 1. Among them, L and L, are basically equal.
Figure 1 Sample
4.2 The sampling position should be more than 150mm away from the end face of the pipe spigot or the socket joint, and all its edges are broken sections. And the debris attached to the surface of the sample should be washed away.
4.3 The sample can also be taken from the broken pipe after the external pressure strength and bending strength test. 4.4 The sample can be marked with water-insoluble pigments. However, the coating area of ​​the pigment shall not exceed 1% of the total surface area of ​​the sample. Approved by the State Administration of Quality and Technical Supervision on October 12, 1998, and implemented on April 1, 1999
5 Test steps
GB/T2834—1998
5.1 Wash the sample with water and place it in a drying oven. Dry it at 110℃±5℃ to constant weight, and then place it in a desiccator to cool to room temperature.
5.2 Weigh the dry mass of the sample to an accuracy of 0.01g. 5.3 Water absorption treatment.
5.3.1 Boiling method: Place the sample in a boiling vessel and add distilled water until the sample is completely submerged (see Note), then heat it until the water boils and continue to boil for 2 hours at a slightly boiling state, and then cool it to room temperature. To prevent the sample from colliding and falling off, a clean gauze should be placed between the bottom of the vessel and the sample during boiling.
5.3.2 Vacuum method: Place the sample in a clean vessel, place it in a vacuum dryer and evacuate until the residual pressure is less than 2.7kPa, maintain for 10 minutes, then slowly inject distilled water through the pipette funnel installed on the top of the vacuum dryer until the sample is completely submerged (see note), continue to evacuate for 10 minutes at the same pressure and then release the vacuum. Take out the vessel containing the sample and let it stand at room temperature for 30 minutes. Note: During the entire process of water absorption, keep the water level higher than the sample. 5.4 Take the sample out of the water, remove the moisture on the surface of the sample with several layers of wet gauze that have been twisted to remove excess water, and then quickly weigh the mass of the sample saturated with water in the air, accurate to 0.01g. 5.5 If there is a dispute over quality, the test should be carried out according to the boiling method. 6 Calculation of results
The water absorption of the sample is calculated according to the following formula, and the result is accurate to one decimal place W=m2 mi
1×100
Wherein: W——water absorption of the sample, %;
m——dry mass of the sample, g;
m2——mass of the sample saturated with water in the air, g. 7 Test report
The test report should include:
a) name and number of the sample;
b) number based on the standard:
c) method for handling water absorption of the sample;wwW.bzxz.Net
d) dry mass of each sample, mass of the sample saturated with water, single value and average value of water absorption; e) test date and test personnel.
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