| 摘要 |
PURPOSE:To provide the extruded cement building material which has closed cells in the matrix, is light in weight and has excellent freezing resistance by compounding a water absorptive polymer which has water absorbability of >=20 times the water absorbability of cement under the strong alkalinity of the cement and exhibit a granular state in a water absorbing state with the cement. CONSTITUTION:The water absorptive polymer (e.g., 'Sumicagel S type(R)' produced by Sumitomo Chemical) which has >=20 times the water absorbability of the cement under the strong alkalinity of 12 to 13pH and maintains the granular state in a water absorbing state is mixed at 0.1 to 5wt.% with an admixture composed of a hydraulic binder, such as Portland cement, aggregate, such as silica sand powder, flyash, and pearlite, heat resistant inorg. or org. fibers, thickener, etc., and the mixture is kneaded and extrusion-molded. The molding is thereafter cured in an autoclave at >=120 deg.C, more preferably >=150 deg.C by which the lightweight extruded cement building material having the closed cells is produced. |
