JB/T 4307-2004 Cement mortar for insulators
1 Scope
This standard specifies the definition, classification, technical requirements, test methods and inspection rules of cement mortar.
This standard is applicable to cement mortar used for porcelain or glass insulators with portland cement, iron-aluminate cement and sulphoaluminate cement as cementitious materials.
2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections) to, or revisions of, any of these publications do not apply to this standard. However parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the document referred to applies.
GB/T 177-1985 Test method for strength of hydraulic cement mortar
GB/T 750-1992 Autoclave method for soundness of portland cement
GB/T 2900.8-1995 Electrotechnical terminology - Insulators
GB/T 4131-1997 Nomenclature, definition and terminology of cement
JB/T 5896-1991 Common insulators - Terminology
JC/T 724-1982 (1996) Apparatus for physical test of cement - Electrically driven flexure testing device
JC/T 725-1982 (1996) Apparatus for physical test of cement - Compression jig
JC/T 726-1997 Mould for cement mortars
3 Terms and definitions
For the purposes of this standard, the terms and definitions given in GB/T 2900.8, GB/T 4131 and JB/T 5896 and the following apply.
3.1
cement mortar
substance formulated with portland cement or other types of cement that meet the requirements as the cementitious material, along with filling materials such as sand and water, is used to fill the gaps between porcelain or glass insulator porcelain parts or glass parts and metal accessories, as well as between porcelain parts or glass parts, and to permanently connect them after hardening
Note: Admixtures can be added to improve the performance of cement mortar.
3.2
autoclave expansion
in order to enable the periclase (which hydrates slowly under normal conditions) contained in cement in cement mortar to hydrate in a short time, saturated steam it at 215.7℃ (corresponding to a pressure of 2.0MPa) for 3h, and the hydration expansion of periclase and others can be reflected by the deformation of samples
Foreword II
1 Scope
2 Normative References
3 Terms and definitions
4 Classification of cement mortars
5 Technical requirements of cement mortar
6 Test methods
7 Inspection rules
Annex A (Informative) Reference technical requirements for cement mortar
Annex B (Informative) Technical requirements for raw materials of cement mortar
Annex C (Informative) Standards related to raw materials of cement mortar
