| abstract |
(57) [Abstract] [Problem] Conventional roof tiles have a considerable weight, It was fixed by mutual weight and was able to withstand strong winds. However, due to the earthquake and other factors in the Hanshin area, some of the houses collapsed under the load, and some drawbacks due to their weight were seen. For this reason, cement and lightweight aggregate have been used to reduce the weight, but the bending strength is reduced. The present invention is designed to reduce weight, Moreover, it is intended to obtain a lightweight thick slate that has sufficient bending strength and can replace conventional roof tiles. SOLUTION: Cement, a weight-reducing material and a strength-improving material have a specific ratio, that is, 50 to 100 parts by weight of sand, 1 to 20 parts by weight of an inorganic foam as a weight-reducing material, and strength improving to 100 parts by weight of cement. The material is formed by mixing 0.5 to 20 parts by weight. |