| 摘要 |
<p>A mixture of 70% clay, 30% chalk is ground, mixed with 10% water, compressed at 200 kg/cm2, autoclaved at 16 atm./200 degrees C and then dried at 400 degrees C, as described in the parent patent. In this addition, powdered egg white albumin is added to the mixture to give a harder concrete.</p> |
