| 摘要 |
<p>Cement compositions contain as essential components (I) a silicon dioxide filler. (III) water, and (IV) an org. cpd. contg. NCO groups. (I) may be Portland cement, a quick curing cement a low heat cement, a sulphate resistant cement, a Portland high Oven cement, a bricklaying cement, a natural cement, a lime cement, a selenitic cement, a Pozzolone cement, or a calcium sulphate cement. (II) pref. has a particle size of 1.5-200 B.S. sieve. The cement composns. cure rapidly, and can be used for the prepn. of foamed materials. The compsns. can be easily levelled, to give flows with a superior finish. The cured compsns. have a good stability.</p> |
