3Chandrashkehar G V, Shafer M W.Polymer impregnation of macro- defect- free cement. J Mat Sci,1989,24: 3353~ 3355.
4Young J F.Orango- cement composites( MDF cements) : Current status.In: Naomi Maeda,ed. Proceeding of MAE TA workshop on high flexure polymer cement composites. Sakata:Maeta Concrete Limited Company, 1996.1~ 10.