| 摘要 |
<p>An earth-moist concrete mixture is prepared consisting of cement, additives and water. The mixture is pressed in a mould, allowed to harden, and, if required, treated with steam. The additives, comprising 50-70 kg. water/m3, are mixed without adding further water with 125-175 kg. class B cement having a specific surface according to Blame of ca. 4200 cm2/g per m3 of the additives. The mixture is pressed in the mould at a pressure of at least 500 kg/cm2.</p> |
