| 摘要 |
PURPOSE:To provide the subject quick setting admixture for wet spraying composed of slaked lime, sodium aluminate, sodium carbonate, plaster and alumina cement in a specified weight ratio and having sharp quick setting properties and a short hardening time in a small amount thereof added. CONSTITUTION:With 7-20wt.% slaked lime 10-20wt.% sodium aluminate, 20-30wt.% sodium carbonate, 5-15wt.% plaster and 25-45wt.% alumina cement are blended to produce the objective quick setting admixture for wet spraying. As the sodium aluminate, a material with 1-5 molar ratio of Al2O3/Na2O is preferable and as the alumina cement an ultrafine-powder material with >=6500cm<2>/g grain size (Blaine value) is preferably used. In proportion to the amount of the resultant quick setting admixture for wet spraying added, the setting time is reduced and so control of application thereof at the job site is ready. In addition the resultant quick setting admixture is highly resistant to freezing and melting and shows a strength enough to be practically used without a problem. |
