Reinforcing method of concrete structure and reinforced concrete structure obtained thereby

Abstract

A reinforcing method of a concrete structure comprising coating or impregnating a surface portion of the concrete structure with a composition containing (a) a quaternary ammonium silicate in an amount of 5 to 30 parts, in which SiO 2 is contained in an amount of 10% to 45% by weight, and (b) water in an amount of 95 to 70 parts, on a solid basis, wherein (a)+(b)=100 parts by weight, thereby improving waterproofness, preventing neutralization, inhibiting chlorine ion permeation, improving resistance to freezing and thawing, increasing mechanical strength, and improving a deterioration prevention effect, durability and resistance to natural staining. A reinforced concrete structure obtained by the reinforcing method is also provided.

What is claimed is:  
     
         1 . A reinforcing method of a concrete structure, comprising coating or impregnating a surface portion of the concrete structure with a composition containing (a) a quaternary ammonium silicate in an amount of 5 to 30 parts, in which SiO 2  is contained in an amount of 10% to 45% by weight, and (b) water in an amount of 95 to 70 parts, on a solid basis, wherein (a)+(b)=100 parts by weight.  
     
     
         2 . The method according to  claim 1 , in which said quaternary ammonium silicate is represented by (R 3 N) 2 O·nSiO 2 , wherein R is an alkyl group having one or more carbon atoms, and n is an integer of 1 or more.  
     
     
         3 . The method according to  claim 1  or  2 , in which said concrete structure is a deteriorated concrete structure.  
     
     
         4 . The method according to any one of  claims 1  to  3 , in which said concrete structure is reinforced concrete or at least one cement structure selected from the group consisting of a formed article of a cement material, a formed plate thereof and a mortar-coated article.  
     
     
         5 . The method according to any one of  claims 1  to  4 , in which after the coating or the impregnation, drying and hardening at ordinary temperature, low-temperature heating treatment at 60 to 120° C. for 1 to 3 hours, or steam treatment is carried out.  
     
     
         6 . A reinforced concrete structure obtained by the method according to any one of  claims 1  to  5 .