A remedial method for repairing a damaged cement sheath, especially for use in wells in which fluids with a pH lower than 6 are injected, stored or extracted, comprises placing an acid swellable composition adjacent to the cement sheath. In the event of cement-matrix failure, or bonding failure between the cement/casing interface or the cement/borehole-wall interface, the composition may be injected into or adjacent to the cement sheath so that the material swells when contacted by acid gases, including carbon dioxide and hydrogen sulfide. The swelling seals voids in the cement matrix, or along the bonding interfaces, thereby restoring zonal isolation.

A remedial method for repairing a damaged cement sheath, especially for use in wells in which fluids with a pH lower than 6 are injected, stored or extracted, comprises placing an acid swellable composition adjacent to the cement sheath. In the event of cement-matrix failure, or bonding failure between the cement/casing interface or the cement/borehole-wall interface, the composition may be injected into or adjacent to the cement sheath so that the material swells when contacted by acid gases, including carbon dioxide and hydrogen sulfide. The swelling seals voids in the cement matrix, or along the bonding interfaces, thereby restoring zonal isolation.

The present disclosure describes modular blocks configured to give the appearance of natural or cut stone. An aesthetic coating composition may be applied to one or more surfaces of a block having a low-density, such as an insulating concrete form (ICF), to form an modular block having the appearance of cut stone. The aesthetic coating composition includes a binder component, such as a cementitious binder made from white Portland cement, or a polymer binder such as an acrylic binder, an aggregate component, such as a limestone aggregate component, and optionally an adhesive component. The aggregate component includes a fine sand portion and a coarse sand portion that effectively enable the appearance of cut stone after finishing of the aesthetic coating surface via sanding, polishing, sandblasting, acid etching, acid finishing, or exposed aggregate finishing.

A marine ecological engineering construction method, an asphalt cement-based coating, and a preparation method thereof are provided. The asphalt cement-based coating can make discarded concrete have the capacity of inducing the settlement of sessile organisms, achieve the purpose of using discarded concrete to construct ecological engineering, and has the characteristics of discarded object recycling and marine ecological restoration.

A marine ecological engineering construction method, an asphalt cement-based coating, and a preparation method thereof are provided. The asphalt cement-based coating can make discarded concrete have the capacity of inducing the settlement of sessile organisms, achieve the purpose of using discarded concrete to construct ecological engineering, and has the characteristics of discarded object recycling and marine ecological restoration.

A layered assembly including a substrate based on a hydraulically binding composition, a primer layer, and a constructional layer wherein the primer layer is positioned between the substrate and the constructional layer, and wherein the primer layer includes a polymer and a wax. The invention also relates to methods for producing the layered assembly and methods for detaching the constructional layer from the layered assembly.