| 摘要 |
<p>A low density concrete having an oven dry density of 15 to 35lbs./cu ft. has, as its aggregate, closed-cell, foamed plastics, particularly polystyrene particles of density 1 to 10, preferably 1 to 3lbs./cu. ft. A typical mixture consists of polystyrene foamed particles 7.8 parts by wt., Portland cement 100, water 51, surface active additive 0.36, and air entraining synergist 0.56. The resultant concrete is fire-resistant, can be fashioned with carpenter's tools, and can be used as the core material in laminates.</p> |
