use the dry cured density of the resulting cementitious composite is controlled between 300 and 1000 kg m 3 as a function of the amount of foam added for rock support the ideal density is between 650 and 1000 kg m 3 which gives an initial deformation under a compressive load between 3 5 and 5 mpa which is what is required for rock support and the mode of failure thereafter is non catastrophic referring to the drawings fig1 is a graph from a test of a solid block of eucalyptus in which a load was applied to the block at right angles to the direction of grain load is depicted on the x axis as against displacement on the y axis so illustrating the mode of failure of the block fig2 is a graph of the results of a test on a composite product of the invention with a load being applied to the product again load is depicted on the x axis as against displacement on the y axis and may be compared to the graph of fig1 the composite product has a superior load support characteristic to the hard wood in that displacement only commences at a compressive load of approximately 5 mpa which in any case can be varied as a function of density and then continues to support increasing load with gradual displacement the hard wood on the other hand shows displacement commencing immediately when subjected to load 120 kg of common mixed paper waste in a slurry containing 65 by mass of water is slushed or dispersed in 1 700 kg of a 2 solution of mowiol 4 88 in water until the fibres are separate and intimately dispersed 2 000 kg of calcium sulphate hemihydrate.