2017 Volume 71 Issue 1 Pages 633-638
It is necessary to be crushed and downsized to recycle the used roof tiles. The crushed roof tiles are including a large quantity of powders. This is called “the recycled roof tiles fine aggregate”. Characteristics of the crushed roof tiles are lightweight and porous structure.
The ultimate aim of this study is the Application development of air mortar using the recycled roof tiles fine aggregate. In addition, it is the zero-emission of the used roof tiles. For the application of the tiled air mortar, cured physical properties were ascertained assuming “coating material” such as sand-scattering prevention which does not require high strength. In this study, we clarify the relationship between the void ratio and various strengths and further clarify the relation with the water permeability.
From experiments, when the sand cement ratio is small and the water cement ratio is large, air-mortal is difficult to constrain foaming. Compressive strength of the air-mortal using the recycled roof tiles fine aggregate can be estimated from void ratio. Furthermore, the static elastic modulus, bending strength, tensile strength can be estimated from compressive strength. When the air quantity of the air-mortar is about 40％, it has high water permeability. The recommended mixing proportion of the air mortar is that the sand cement ratio is 2.5, the water cement ratio is 40％ and the target air quantity is 40％.
