| 摘要 |
<p>1,220,410. Cementitious compositions. CIMENTS LAFARGE. 20 Dec., 1968 [22 Dec., 1967], No. 60626/68. Heading C1H. A cement consists of a mixture of:-(a) an aluminous cement and 1-60 wt. per cent of a tricalcium silicate prepared by clinkering or fusion from natural or artificial material, e.g. marls, calcareous marls and siliceous limestone; (b) 50-90% aluminous cement, 10-40% tricalcium silicate and 2-10% of calcium borate or an alumina/calcium borate mixture; (c) 50- 75% aluminous cement, 25-30% tricalcium silicate and up to 25% gypsum; or (d) 70- 30% slag and 30-70% of a mixture consisting of 40-60% aluminous cement and 40-60% tricalcium silicate. Mortars and concretes contain aluminous cement as the binder and tricalcium silicate of up to 0À63 mm. as part of the aggregate whilst the rest of the aggregate consists of sand of specified size distribution.</p> |
