| abstract |
PURPOSE: To obtain the title composition capable of preparing exterior and interior building materials without using asbestos by mixing cement, a lightweight aggregate, an inorg. aggregate consisting of a spherical aggregate and a superfine-grain aggregate, a reinforcing fiber, and a cellulosic admixture. n CONSTITUTION: (A) One hundred pts.wt. cement (e.g., portland cement and blast- furnace cement), (B) 5-100pts.wt., preferably 5-50pts.wt., lightweight aggregate [inorg. hollow (porous) grains such as fly ash having ≤2mm, preferably 0.1-2mm, grain diameter and ≤0.5, preferably 0.1-0.4, bulk density], (C) 5-100pts.wt., inorg. aggregate (superfine-grain aggregate contg. micro silica, for example, consisting essentially of a spherical aggregate having 1-100μm grain diameter, and contg. 1-20wt.% grains having 0.01-1μm diameter), (D) 0.2-10pts.wt., reinforcing fiber (the org. fiber, pulp, fibrous wollastonite, etc., having 1-100μm diameter and 3-20mm length), and (E) 0.1-10pts.wt., preferably 0.5-5pts.wt., cellulosic admixture (methylcellulose, etc.) are mixed to obtain the lightweight cement composition. n COPYRIGHT: (C)1989,JPO&Japio |