Reclaiming scrap rock wool or glass wool - by mixing scrap with sand, cement, and water so it can be cast to make building elements possessing good thermal insulation

摘要

This is an addn. to 74.43348, which describes the use of scrap rock- or glass- wool. The scrap is mixed with sand, cement and water to form a material which can be cast in a mould, esp. to form building elements. The pref. mixt. contains equal amts. of sand and cement, each of which being equal to one-quarter of the amt. of scrap. The mixt. pref. also contains 1-3 wt.% w.r.t. the wt. of cement, of a setting accelerator. An example is a mouldable mixt. contg. 320 kg scrap rock wool; 80 kg sand, size 0/3; 80 kg cement; 1 kg accelerator; and 5-10 litres water. Vibration may be used to aid casting of the mixt.