Using a new composite expansive material to decrease deformation and fracture of concrete

Using minerals of dolomite, serpentine and magnesite produce a new composite material which provides an expansive stress to decrease deformation and fracture of hydraulic concrete. The compositions of the expansive material are mainly MgO, CaO and C2S by X-ray techniques. Adding the expansive material to concrete, the shrinkage of concrete may be compensated by the hydration of CaO to Ca(OH)(2) in early ages and the hydration of MgO to Mg(OH)(2) in later ages respectively, so decrease deformation and fracture of concrete. (C) 2007 Elsevier B.V. All rights reserved.