美国克罗依德公司生产一种封闭钴探孔和矿山废弃钻孔的新型注浆材料,它乃是以膨润土为主的材料,它混合以后,有如膨润土钻液,但却含26%以上的固体颗粒,其可泵送性可保持两小时。最终的混合物可作为有如粘土——油灰稠度的塑性材料供应,并可作为低级材料使用。它不收缩,仍保持其柔韧性,并能适应土岩的轻微移动。据称,即使套管顶端孔口物料破坏了也能保持封闭。 The US company Croft produces a new type of grouting material that encloses cobalt boreholes and abandoned mines in mines. It is a bentonite-based material that, when mixed, is bentonite, but contains more than 26% solid particles , Its pumpability can be maintained for two hours. The final blend can be supplied as a plastic material with a clay-to-ash consistency and can be used as a lower grade material. It does not shrink, remains flexible and accommodates the slight movement of earth and rock. Allegedly, even if the material at the top of the bushing is damaged, it can remain closed.