COMPRESSIVE STRENGTH AND PERMEABILITY OF HIGH-PERFORMANCE CONCRETE UNDER CURING CONDITIONS SIMULATED MASSIVE CONCRETE STRUCTURES

摘要

The compressive strength, chloride penetration resistance and microstructure of twohigh-performance concretes were examined under three curing conditions. Curing conditionsinclude standard curing (SC), matched curing (MC, which means sealed concrete specimenscuring at temperature controlled box) and matched curing of naked concrete (NMC)according to development law of temperature measured in mass concrete on site. Resultsindicate that concrete under MC and NMC show higher resistance to chloride penetration thanthe one under SC. Concrete under MC has a little bit lower chloride penetration than thoseunder NMC, but the compressive strength of specimens under NMC was higher than the oneunder MC at 56d. In addition, concrete under NMC and MC have higher early strength thanunder SC, especially at early age. However, the order of curing conditions affectingcompressive strength of concrete at 248 days is: SC>NMC>MC.