| 摘要 |
<p>A binary mix which provides a cementitius building material, one part of the mix being a hydraulic cement containing wet fraction capable in time of first setting and then curing while the other component of the binary mix is an aggregate fraction made up primarily of a wood material which has been coated by a substantially insoluble material. The coating is preferably applied by a pre-mixing process when the coating material is water and/or organic solvent borne. The coating is allowed to dry before the binary mixing and in use provides a substantial barrier to the movement (i) of leachate from the woody material into the cement containing wet fraction and (ii) of water from the cement containing wet fraction into the woody material for at least 5 hours after the substantially homogeneous mixing.</p> |
