| 摘要 |
PROBLEM TO BE SOLVED: To provide a microsilica having fluidity capable of being easily added to a fibrous cement mixture and reducing its transportation and storage cost by using the micro silica having a bulk density within a specific range. SOLUTION: In this method for producing a cement roofing and a wall cladding containing no asbestos and containing a fibrous material, a mixture consisting of one or more kinds of volcanic ash materials containing cement, water, the fibrous material containing no asbestos and the micro silica is molded and hardened into a roofing and wall cladding product. In this case, the micro silica to be added into the mixture has a bulk density of from 425 kg/m3 to <550 kg/m3. |
