| 摘要 |
A calcium silicate based material is disclosed comprising a matrix of calcium silicate consisting predominantly of xonotlite and/or tobermorite to which silica, preferably finely divided silica such as silica fume, has been added to occupy the interstices of the matrix. Calcium ions, residual from the crystal forming reaction may be present or added as calcium oxide, calcium hydroxide or a calcium salt which dissociates in aqueous solutions excluding CaCl2 and other anions which may deletrously affect the material. These then undergo a superficial reaction with the silica particles, providing a cementitious bond between the particles without significant loss of the thermal properties of the silica. The material has improved properties as regards to thermal insulation, shrinkage on drying, and compressibility, after heating at elevated temperatures. |
