A method of cementing in a subterranean formation comprising the steps of: providing a cement composition wherein the cement composition comprises: cement, water and micro-particle silica with an average particle-size distribution of less than 10 microns in diameter, wherein at least a portion of the micro-particle silica was added to the cement composition as contained micro-particle silica, wherein the contained micro-particle silica comprises encapsulated micro-particle silica and wherein the encapsulated micro-particle silica comprises at least one coating of a degradable material, wherein the degradable material comprises dextran; cellulose; a chitin; a chitosan; a liquid ester; a protein; an aliphatic polyester; a poly(lactide); a poly(glycolide); a poly(ε-caprolactone); a poly(hydroxybutyrate); a poly(anhydride); an aliphatic polycarbonate; an ortho ester; a poly(orthoesters); a poly(amino acid); a poly(ethylene oxide); or a polyphosphazene; wherein the contained micro-particle silica degrades to release the micro-particle silica during preparation of the cement composition and wherein the degradation of the contained micro-particle silica occurs prior to placement of the cement composition into the subterranean formation, placing the cement composition into the subterranean formation; and allowing the cement composition to set. providing a cement composition wherein the cement composition comprises: cement, water and micro-particle silica with an average particle-size distribution of less than 10 microns in diameter, wherein at least a portion of the micro-particle silica was added to the cement composition as contained micro-particle silica, wherein the contained micro-particle silica comprises encapsulated micro-particle silica and wherein the encapsulated micro-particle silica comprises at least one coating of a degradable material, wherein the degradable material comprises dextran; cellulose; a chitin; a chitosan; a liquid ester; a protein; an aliphatic polyester; a poly(lactide); a poly(glycolide); a poly(ε-caprolactone); a poly(hydroxybutyrate); a poly(anhydride); an aliphatic polycarbonate; an ortho ester; a poly(orthoesters); a poly(amino acid); a poly(ethylene oxide); or a polyphosphazene; wherein the contained micro-particle silica degrades to release the micro-particle silica during preparation of the cement composition and wherein the degradation of the contained micro-particle silica occurs prior to placement of the cement composition into the subterranean formation, cement, water and micro-particle silica with an average particle-size distribution of less than 10 microns in diameter, wherein at least a portion of the micro-particle silica was added to the cement composition as contained micro-particle silica, wherein the contained micro-particle silica comprises encapsulated micro-particle silica and wherein the encapsulated micro-particle silica comprises at least one coating of a degradable material, wherein the degradable material comprises dextran; cellulose; a chitin; a chitosan; a liquid ester; a protein; an aliphatic polyester; a poly(lactide); a poly(glycolide); a poly(ε-caprolactone); a poly(hydroxybutyrate); a poly(anhydride); an aliphatic polycarbonate; an ortho ester; a poly(orthoesters); a poly(amino acid); a poly(ethylene oxide); or a polyphosphazene; wherein the contained micro-particle silica degrades to release the micro-particle silica during preparation of the cement composition and wherein the degradation of the contained micro-particle silica occurs prior to placement of the cement composition into the subterranean formation, placing the cement composition into the subterranean formation; and allowing the cement composition to set.