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It is well-known that the polymer impregnated concrete (PIC) has many excellent characteristics such as high compressive strength of over 1500kg/cm2, large elongation capacity, negligibly small water permeability and no-shrinkage. And it has also been reported by BNL and USBR that PIC shows good resistance to chemical attack. However, the chemical stability of PIC has been evaluated only form its weight loss, but scarecely from the loss of its mechanical strength.In this paper, the losses in weight and strength of a plain mortar, a mortar (PIC) impregnated with poly-methyl-methacrylate polymerized by thermal-catalyzer with BPO=5%, and a mortar impregnated with polypropylene fiber reinforced polymer were examined in order to obtain their resistance to chemical attack by 10%-HCl, 10%-MgSO4, 10%-CH3COOH and pure C6H6.The results showed that the weight loss of PIC (18.6%) was less than that of the plain mortar (24%), when attacked by 10%-HCl for 28 days. The losses in compressive strength of PIC and plain mortar after attacked by HCl were 67% and 97%, respectively; and after attacked by CH3COOH the losses were 26% and 57%, respectively. So, it can be said from the viewpoint of compressive strength that the chemical resistance of PIC is 23 times that of the plain mortar against HCl and 3.6 times against CH3COOH.

Although the polymer impregnated concrete (PIC) has such excellent characteristics as high strength, small water permeability, high corrosion resistance and no shrinkage, it has such weak points as low impact strength, no plastic range in strain and low toughness.In the present paper, the mechanical properties of fiber reinforced polymer impregnated concrete have been investigated by using several fibers, made of glass, polypropylene and metal, and MMA-and SM-monomers. The main results obtained are as follows:Among the five kinds of fiber examined, piano wire with 0.2mm diameter and 35mm length was most effective. The strengths of FPIC reinforced by the piano wire were 2003kg/cm2 for compressive, 536kg/cm2 for flexural, 195kg/cm2 for tensile, and 186kg/cm2 for Charpy's impact strength, whereas those of plain mortar cured in water were 593, 73, 36 and 8.7kg/cm2, respectively. And from the fact that the tensile maximum strain at the ultimate strength obtained in repeated bending test for PW-PIC beam 2500×10-6, it is deduced that FPIC-material has large toughness and has far more useful properties than PIC.