Reconfigurable cement composition, articles made therefrom and method of use

A method of forming a reconfigurable cement article, comprising:

• forming a pourable aqueous cement composition comprising a mixture of:
• a hydraulic cement, water;
• and a selectively removable material comprising a plurality of selectively corrodible metal powder particles other than aluminum particles having outer metallic coating layers dispersed within the cement or a selectively corrodible nanomatrix powder compact of metal powder particles other than aluminum particles having outer metallic coating layers disposed within the cement, or a combination thereof;
• and
• pouring the cement composition into a space form that is configured to receive the cement composition to form the article.

A pourable aqueous cement composition, comprising a mixture of:

• a hydraulic cement,
• water;
• and
• a selectively removable material comprising a plurality of selectively corrodible coated metal powder particles having outer metallic coating layers dispersed within the cement or a selectively corrodible nanomatrix powder compact of metal powder particles having outer metallic coating layers disposed within the cement, or a combination thereof, wherein each of the selectively corrodible metal powder particles comprise a particle core comprising a core material and the metallic coating layer comprising a metallic coating material disposed on the particle core, and wherein the nanomatrix powder compact comprises a metallic cellular nanomatrix of a metallic nanomatrix material formed from the outer metallic coating layers having a plurality of dispersed particles of a metallic particle core material disposed therein, and wherein the core material and the coating material are different materials and the metallic nanomatrix material and the particle core material are different materials.