Cementitious binders and wood particles-based incombustible coloured composite panel with structural high performance

Abstract

This invention relates to a composite panel made from wood and cementitious binders, with flat surfaces and several possible colours. The said panel comprises 35 to 85% of grey or white Portland cement; 10 to 30% of debarked resinous wood particles; 5 to 20% of semi-hydrated calcium sulphate; 0 to 10% of a surface accelerator; 0 to 10% of aluminium sulphate solution; 0 to 30% of calcium carbonate; and 0 to 15% of pigments. The invention uses the process of preparation for the existing VIROC panel, adjusting it to the new material. This panel, in addition to being very resistant and showing high performances in terms of resistance to impact, humidity, temperature variation, noise and fungi, as well as other microorganisms, also complies with all the requirements of the associated product standard.

1 . Incombustible composite panel of high performance, made from Portland cement, gypsum and wood particles, characterized in that it comprises in weight percentage of the components with reference to the dry weight of the composition:
 1) 35 to 85% of grey or white Portland cement;   2) 10 to 30% of debarked resinous wood particles;   3) 5 to 20% of semi-hydrated calcium sulphate;   4) 0 to 10% of a surface accelerator;   5) 0 to 10% of aluminium sulphate solution;   6) 0 to 30% of calcium carbonate; and   7) 0 to 15% of pigments.   
     
     
         2 . Composite panel according to  claim 1 , characterized in that the resinous wood used in order to obtain the component 2) is pinewood. 
     
     
         3 . Composite panel according to  claim 1  or  2 , characterized in that the wood particles used as the component 2) are in the form of chips. 
     
     
         4 . Composite panel according to  claim 3 , characterized in that the thickness of the said chips ranges from 0.25 to 0.32 mm. 
     
     
         5 . Composite panel according to  claim 3  or  4 , characterized in that 50 to 70% of the said chips are <1 mm long and 26 to 40% have a length of 1 to 4 mm. 
     
     
         6 . Composite panel according to any of the  claims 1  to  5 , characterized in that the surface accelerator used as the component 4) is sodium silicate solution with a density ranging from 1.10 to 1.15 g/cm 3 . 
     
     
         7 . Composite panel according to  claim 6 , characterized in that the sodium silicate has a Si0 2 /Na 2 O ratio between 3.19 and 3.53. 
     
     
         8 . Composite panel according to any of  claims 1  to  7 , characterized in that the aluminium sulphate used as the component 5) has a density between 1.05 and 1.10 g/cm 3 . 
     
     
         9 . Composite panel according to any of  claims 1  to  8 , characterized in that the pigments used as the component 7) are metal oxide pigments. 
     
     
         10 . Composite panel according to any of  claims 1  to  9 , characterized in that it has a tensile strength under bending >9 N/mm 2 , a tensile strength perpendicular to the plane >0.5 N/mm 2  and an elasticity modulus >4000 N/mm 2 . 
     
     
         11 . Composite panel according to any of  claims 1  to  10 , characterized in that its thermal conductivity is <0.23 W/m 2 .K.