This standard specifies the test method for the composition of cement mortar. GB/T 17458-1998 Cement mortar for ductile iron pipes Centrifugal method Test for the composition of fresh mortar GB/T17458-1998 Standard download decompression password: www.bzxz.net
This standard specifies the test method for the composition of cement mortar.

CB/T17458—1998
This standard is equivalent to IS0660D:1980 & Inspection of the composition of fresh slurry of ductile iron arm cement mortar centrifugal lining.
The difference between this standard and IS06600 is the addition of Appendix A to clarify the definition of ductile iron pipe in [ISO253:1991]. Appendix A of this standard is the appendix of the standard.
This standard was proposed by the State Machinery Industry Bureau. This standard is under the jurisdiction of the National Technical Committee for Standardization of Metallic and Non-metallic Coverings. The responsible drafting units of this standard are: Wuhan Institute of Material Protection, Xuzhou Guangren Xinxing Casting Pipe Co., Ltd. The main drafters of this standard are: Gao Zhi, Qian Hongji, Huang Guangjing, Xiao Dejun, Feng Changle. CB/T17458—1998
ISO Foreword
ISO (International Organization for Standardization) is a worldwide federation of national standards bodies (IS member bodies). The work of formulating international standards is generally carried out through technical committees: each group of companies interested in the relevant topics determined by the technical committee has the right to make statements to the committee, and governments and non-governmental international organizations associated with ISO can also participate in this work. The draft international standard adopted by the technical committee is first sent to the member bodies for approval before being submitted to the ISO Council for approval as an international standard. This international standard ISO 6600 was organized by the ISO/TC 5 Technical Committee on Ferrous Metals and Metal Fittings. It was approved in 1979. Distributed to member bodies in March 2000.
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1 Scope
National Standard of the People's Republic of China
Ductile iron pipes Centrifugal cenent mertar lining-Composition controls of freshly applied nortarGB/T 17458--1998
eIs06600.1980
This standard specifies the test method for the composition of cement mortar. This type of cement mortar is prepared according to the requirements of GB/17457 "General requirements for centrifugal lining of ductile iron pipe cement mortar". This standard is applicable to the inner surface centrifugal lining of pressure water supply spherical cast iron pipes defined in t谢录A and centrifugal casting spherical cast iron pipes defined in GS13295.
2. Cited Standards
The clauses contained in the following standards constitute the clauses of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised. Parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T13295-1991 High-centrifugal casting ball casting cast iron (NISC) 2531: 1986) GB/T17457-1998 Ductile iron casting drinking straw cement mortar centrifugal lining general requirements (EVIS04179: 1985)
3 Composition test of fresh mortar
3.1 General
The composition test defined in this standard includes the determination of the composition ratio S/(the ratio of the mass of water to the mass of cement) and the ratio of the mass of water to the mass of cement) of the fresh mortar used for centrifugal sealing. The mortar sample used for the determination should be sampled from the social layer in the pipe within 15 minutes after the implementation of the centrifugal lining. Taking into account the segregation of the more mutual components in the mortar and the phenomenon of inhomogeneity of the strata caused by the centrifugal stratification method, the sample taken out should be representative of the total primary layer thickness as much as necessary.
3.2 Determination of S/C ratio
3.2.1 Determination equipment
The equipment required for this determination is as follows:
a sieve with a mesh size of 0.16mIn or a standardized sieve with a mesh size closest to it, a container with the same diameter as the sieve,
3.2.2 Pre-calibration
The determination of S/C ratio must be pre-calibrated according to the following procedure: The above sieve is allowed to sieve 500g of dry sand:
Weigh the finest sand that passes through the mesh and calculate the percentage of this part of fine sand to the mass of the lower sand. 3.2.3 Inspection of the composition of banknote pulp
Approved by the State Administration of Quality and Technical Supervision on August 12, 1998, implemented on July 1, 1999
S/C The test of proportion is carried out according to the following procedure: 1. Weigh 500g of cement mortar:
CB/T17458—1998
Put the sieve on the container and pour the mortar into the sieve: Use running water to sieve the mortar until the sand remaining in the sieve is clean; collect the cement and the part of the fine sand that flows down with the running water into a sieve; 2. Let it settle for about 1h, and siphon off the clean water in the container; dry and weigh the mass of the sand remaining on the sieve, and dry and weigh the mixed mass of the fine sand and cement in the collection container. The proportion of each component is calculated as follows:
Separation: 5
(100%—s
Cement: C =P-(SS)
Combining (1) and (2) to calculate the S/C ratio of cement mortar. 3.3 Determination of E/C ratio
To calculate the F/C ratio, S/C (see 3.2) and E/M (the ratio of water mass to mortar mass after drying) must be determined first, according to the following formula: -(1+
E/M can be determined by one of the following two methods. 3.3.1 Drying method
The principle of this method is to determine the water content by the mass difference between the fresh mortar sample and the dried sand sample. The instruments required for this determination are as follows:wwW.bzxz.Net
· a long-handled pot-shaped container;
a long steel shovel;
a bench scale,
1 000 mL methylated alcohol. The determination procedure is as follows:
- Take the weighed long-handled steel piercer
mass - empty pot mass = m
Place a known amount (e.g., 50 g) of freshly mixed mortar into the pot and weigh it again: pot mass + freshly mixed mortar mass + 250 mL methylated alcohol and scoop it thoroughly with a long steel spatula: Light the methylated alcohol and stir it slowly and continuously, taking care not to overflow; Extinguish the flame, cool, then add 1 mL methylated alcohol, mix well and light; Weigh again
mass = pot mass + dried mortar mass = m?: From these different weighed quantities, the following quantities are derived: Water mass: E = m
Dried mortar mass: M = m - m
Calculate the E/M ratio as follows:
E/M - m.-m
Calculate the E/C ratio by formula (3):
3.3.2 Distillation method of toluene
1) The dimethylbenzene used in this standard refers to a mixture of o-xylene, m-xylene and p-xylene. (1)
(2)
GR/T 17458—1998
The principle of this method is to measure the amount of water collected in the distillation process of the fresh mortar sample after adding toluene. The equipment required for this test is as follows:
* A distillation apparatus 1
A measuring cylinder with a volume of about 200mL;
A bench scale;
About 150 ml of toluene (for industrial use, should not contain water). The measurement procedure is as follows:
Take a weighed distillation bottle
mass = empty bottle mass State:
Put a known amount (about 100) of freshly mixed mortar into the bottle and weigh it again. Mass = bottle mass + freshly mixed mortar mass - m1 Add about 120mL of dimethylbenzene into the bottle for distillation, collect the water and dimethylbenzene mixed liquid in a basket, after the water is separated from the dimethylbenzene, read the water E collected in the lower layer; get the relationship between the collected water volume E and the mass of dry mortar: M-(m)E
Use the following formula to calculate the E/M ratio:
(m,m)-E
Use formula (3) to calculate the E/C ratio.
GB/T 17458—1998
(Appendix to the standard)
Ductile iron pipe for pressure piping
This appendix is ​​equivalent to IS02531:1991 corresponding part. A1 Ductile iron pipe manufacturing technology Ductile iron pipes are manufactured using one of the following four processes: 1) Centrifugal casting using a metal mold on a production line or off-line: 2) Centrifugal casting using a sand mold; 3) Sand mold casting; 4) Metal mold casting, the nominal size in the nominal scale is in accordance with the specified implementation of ISOG708 (see Table 1 in (GB/T17457-1998 General Requirements for Centrifugal Lining of Ductile Iron Pipes Using Cement Mortar) A4 The actual test pressure should not exceed the following values: DN 40--DN 300: -10MPa DN350-DN600: p=8MPa--DN 700~DN 1000:±=6 MPa1-1N 1200-~1N 2000: p--4 MPa:—DN2200~DN2600:P-2.5MPa
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