Cables or cable accessories with fire protection
A technology for cables and accessories, which is applied in the field of cables or cable accessories with fireproof layers, which can solve problems such as insulation and fireproof layers that are not suitable for cables, and achieve good mechanical properties and good fireproof performance.
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Embodiment approach
[0026] According to a first embodiment of the invention, said cementitious material is obtained from a mixture consisting of conventional anhydrous cement and water. Hardening occurs as a result of hydration of calcium silicate and calcium aluminate.
[0027] The anhydrous cement may be Portland cement, especially white cement or slag cement.
[0028] According to a second embodiment of the invention, said cementitious material is a geopolymer cement.
[0029] In the present invention, the term geopolymer bonding or hardening of the geopolymer composition means that hardening occurs by internal reactions of polycondensation type or hydrothermal type and is not the result of pure drying (usually this is based on alkaline silicic acid in the case of salt binders).
[0030] In fact, unlike traditional hydraulic binders, geopolymer cements are formed by alkaline activation by inorganic polycondensation reactions (called geosynthesis), where hardening is the result of hydration r...
Embodiment 1
[0113] Embodiment 1: Manufacture of fireproof cable according to the present invention
[0114] 1.1. Preparation of geopolymer composition (step i)
[0115] An alkaline silicate solution was prepared by mixing 36 g of sodium silicate, 20 g of water and 8 g of potassium hydroxide. Then, 39 g of aluminosilicate and 2.2 g of polypropylene fibers were mixed with the aqueous solution of alkali silicate.
[0116] The solids content of the composition is about 80% by weight. Use it immediately for the next step.
[0117] 1.2. Manufacture of fireproof cables
[0118] Two cables are evaluated:
[0119] - an assembly with 2 copper conductors, denoted as assembly 1, said conductors each having a diameter of 1.5 mm 2 cross-sectional area;
[0120] - an assembly with 4 copper conductors, denoted as assembly 2, said conductors each having 1.5 mm 2 of cross-sectional area.
[0121] The conductors are assembled according to defined mating orientations. A nonwoven paper tape havi...
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Abstract
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