Microcapsule encapsulated microcapsule (MIM) material compositions and methods for preparing the same are provided for self-repairing cements that include a plurality of first microcapsules where each of the first microcapsule comprises a first core and a first shell and a plurality of second microcapsules that each comprise a second core and a second shell where the plurality of second microcapsules are dispersed within a continuous phase comprised within the first core of each of the first microcapsules. The MIM material may be prepared such that the first and second shell comprise a cross-linked material. Compositions for self-healing cement slurries are also provided and include cement, sand, water, and microcapsule encapsulated microcapsules (MIM) materials.

The present invention relates to a cementitious mixture comprising a magnesium-iron solid solution silicate filler or aggregate. a strong base. one or more cementitious materials: and at most 12% water. The present invention further relates to use of the cementitious mixture for making an aqueous slurry, and a method of making a cementitious slurry

The present invention relates to a cementitious mixture comprising a magnesium-iron solid solution silicate filler or aggregate. a strong base. one or more cementitious materials: and at most 12% water. The present invention further relates to use of the cementitious mixture for making an aqueous slurry, and a method of making a cementitious slurry