| 摘要 |
PURPOSE:To produce a lightweight concrete forming material by using a mixture essentially consisting of cement and vinylidene chloride resin foamed particles. CONSTITUTION:Amorphous vinylidene copolymer beads are impregnated with a foaming agent and foamed to produce foamed vinylidene chloride resin particles. Specified atms. of inorg aggregate such as flyash, reinforcing fiber such as vinylon fiber, surfactant, and water are added and kneaded to cement such as portland cement to prepare a mortar. Then the vinylidene resin foamed particles having 10-80 fold foaming rate are added and kneaded to the mortar in a manner that the proportion of foamed particles/mortar is 1/(0.1 to 10). Then the kneaded material is molded with an extruder in vacuum or under pressure. The molded body is kept at specified temp. for precuring and then aged at higher temp. to obtain a lightweight concrete molded material. |
