| 摘要 |
PROBLEM TO BE SOLVED: To capture the chloride ions in concrete and to suppress the corrosion of reinforcing bars arranged in concrete by using lithium aluminum combined hydroxide as a cement admixture. SOLUTION: The lithium/aluminum combined hydroxide to be used is formed of the compd. expressed by the general formula, [Al2 Li(OH)6 ]nX.mH2 O and the average grain size thereof is specified to 50μm or more preferably <=10μm. The grain size thereof is not particularly limited. The amt. of the addition is preferably specified to 0.5 to 10 pts.wt., more preferably 1 to 7 pts.wt. in 100 pts.wt. cement compsn. The amt. is not particularly limited as same as the grain size. In the case of use for partial repair, the hydroxide may be added in a range of 30 pts.wt. in 100 pts.wt. cement compsn. for repair by taking the chlorine ions included in the entire part of the concrete structure into consideration. |
