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

摘要

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 C_2S 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.