| 摘要 |
<p>The composition according to the invention is based on the use of an inert porous material which can be natural, artificial or synthetic, granular in form, and weighing less than 1 kg/dm3 in bulk. The porous granules, e.g. of expanded clay or similar, are partially saturated to the extent of 20 - 30% of their weight, with active ingredients which lower the freezing point of water. The melting additives can be added in the pure state or diluted in water, and there is provision for the addition of about 2% by weight of the melting additive, of anti-acid limiters. The advantages of the composition with respect to sand are the greater managability and ease with which it can be spread on icy or snow-bound surfaces; the low specific weight which reduces the tendency to sedimentation in road drains and sewers, and, compared to salt, the almost non-existent corrosive action on ironwork of vehicles and street ironwork. Ecologically, the composition does not damage the natural vegatative environment. The optimum results thus obtained are attributed to the synergetic effect of the inert material (activated grit) and the melting additive incorporated in it.</p> |
