PURPOSE:To obtain the title composition which is hardenable underwater, fast-hardenable and good in adhesive properties by constituting this composition of one or more kinds of monomer selected from the compd. group of (meth)acrylic esters, a polymer capable of being dissolved or swelled into this monomer and aggregate. CONSTITUTION:This composition is constituted by incorporating one or more kinds of monomer component A selected from the compd. group of (meth)acrylic esters, a polymer B capable of being dissolved or swelled into the component A and aggregated C. This composition is hardenable under-water and fast-hardenable and also excellent in the self-interlaminar adhesive properties of its hardened body and in the adhesive properties between this hardened body and substrate morter or concrete. When this hardened body is connected to a hardened body after lapse of time, the interlaminar adhesive properties of both hardened bodies are improved. As the component A, methyl methacrylate, etc., utilized and as the component B, the homopolymer or the copolymer of (meth)acrylic ester and unsaturated polyester resin, etc., are utilized. As the component C, silica sand, etc., are utilized. The composition is prepared by adding a cross-linking agent and a polymerization initiator in addition to these components.
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