| 摘要 |
The invention relates to a concrete composition and to a process for preparing the same. According to the invention, the composition comprises 1 CEM I 62.5 R cement mass unit and the following components expressed as units from the cement amount: 0.25...0.27 units of very fine silica powder; 0.44...0.46 units of fine quartz sand having a grain size of 0...0.7 mm; 0.15...0.17 units of fine quartz sand having a grain size of 0.4...1.4 mm; 0.09...0.095 units of short straight metal fibres, 0.09...0.095 units of metal fibres with bent ends, 0.065 units of superplasticizing polycarboxylic additive of the IV-th generation, 0.15...0.17 units of water. The process claimed by the invention consists in mixing the materials in the dry state in a forced draft mixer for 2 min, after which the water is admixed together with the plasticizer and they are mixed for 8 min and at the end there are admixed the metal fibres while stirring, thereby resulting a concrete composition to be poured into formworks, dismantled and subjected to thermal treatment. |
