| 摘要 |
<p>An aluminum-blown mineral insulating element (I), especially an insulating board, has a calcium silicate hydrate framework surrounding blown pores, in which more than 40 (preferably more than 50) vol.% of the pores are less than 1 mm in diameter and more than 75 (preferably more than 85) vol.% are less than 2 mm in diameter, and the thermal conductivity (lambda ) is less than 0.045 W/mK. An independent claim is also included for the production of (I) from a mixture containing reactive SiO 2 component(s) (especially quartz powder), hydraulic binder(s) (especially Portland cement), reactive CaO component(s) (especially quicklime and/or hydrated lime), SO 3 component(s) (especially gypsum and/or anhydrite) and optionally conventional additives (e.g. powdered rock and/or other pozzolanic additives such as flue dust, porous concrete dust, powdered insulating board, etc.), by expanding this mixture with finely-divided aluminum (conventional fineness) to develop the pores, allowing it to stiffen, optionally cutting to size and hydrothermally hardening, the mixture being treated, before adding the aluminum, with a blown-pore development inhibitor and/or an agent which affects the development of small blown pores (II).</p> |
