Reliably safe remediated construction aggregate derived from excavated contaminated spoil remediated with a system and method using a sorbent in a verified process of testing and analysis of spoil before and after remediation and of adjusting amounts of sorbent and supplemental water mixed with contaminated spoil.

The invention is a method for rendering containers having hazardous residual paint colorant non-hazardous, by washing the hazardous residual paint colorant from the containers to a level where the containers are no longer considered to be hazardous waste, at which point the containers can be safely introduced into standard waste recycling streams. The method also proposes washing the hazardous paint colorant out of the containers and using the wash water containing the colorant to make paint, aggregate, and precast concrete structures.

A curable composition for production of coatings for thermal, electrical and/or acoustic insulation, where the composition has at least one aqueous binder can be made. The composition has a first component based on spray-dried fumed silica pellets. The composition also has at least one second component selected from the group of the silicon dioxides, preferably microsilica, pellets based on pyrogenically produced silicon dioxide, silica aerogels, silicate glass (foamed glass/expanded glass), hollow silicon dioxide particles (hollow glass beads), or pellets selected from perlites, preferably expanded perlites, vermiculites, polymers, preferably expanded polystyrene pellets, and mixtures thereof.

Described herein are compositions and methods for waste-to-energy ash in engineered aggregate in road construction.