| 摘要 |
<p>1,158,306. Cementitious compositions. A. E. D. ABDELLATIF. 29 June, 1967 [28 April, 1967], No. 30095/67. Heading C1H. [Also in Division C3] Rice husk is roasted i.p.s. 0À02-0À10 m<SP>3</SP> of O 2 /kg. husk until 30-70% of its weight is lost, the ash produced is mixed with at least one water soluble Ca or Ba compound, and an aqueous solution containing at least 0.04% (as Al metal) of an Al compound and an organic nitrogen containing base is added, the pH of the mixture being maintained above 7, and then being compacted at a pressure above 30 kg./cm.<SP>2</SP>, aged, contacted with water and dried. The base is preferably a mixture of piperidine, diphenyl-urea and and aminoguanidine hydrochloride. Optionals are cement, laterite, clay, sand, and gravel as fillers, and borex and CaCl 2 as a hardener.</p> |
