A composition that may include a resin, plastic aggregate, plastic fines, and optionally fly ash. The plastic aggregates and plastic fines may be formed from recycled plastic. The composition may be utilized to repair damaged surfaces, including damages concrete surfaces. The composition may further be used in pre-formed structures. The pre-formed structures may include panels that are assembled to form an upright enclosure, such as a shelter.

A briquette for use as a mineral charge in a cupola furnace for the production of mineral wool fibres is produced by combining: a) recycled waste mineral wool selected from i) waste mineral wool comprising uncured sugar containing binder, ii) waste mineral wool comprising cured binder, iii) waste mineral wool without binder and iv) combination thereof, b) cement, and c) additional sugar(s) to form a mouldable mixture and moulding and curing the mouldable mixture to form the briquette.