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http://dx.doi.org/10.4334/JKCI.2002.14.3.307

Freeze and Thaw Durability of Concrete Using Recycled Aggregates  

문대중 (한양대학교 토목공학과)
팽우선 (한양대학교 토목공학과)
문한영 (한양대학교 토목공학과)
Publication Information
Journal of the Korea Concrete Institute / v.14, no.3, 2002 , pp. 307-314 More about this Journal
Abstract
Utilization of demolished-concrete as recycled aggregate has been researched for the purpose of substituting for insufficient natural aggregate, saving resources and protecting environment. There, however, are some Problems not only the large difference of dualities in recycled aggregates but also a little deterioration of mechanical properties in recycled aggregate concrete in comparison with that of natural aggregate concrete. In this study, the test results of freez and thaw durability of concrete with demolished-concrete recycled aggregate(DRA) arc as follows. Improvement of crushing process is an important assignment because that adhered mortar on source-concrete recycled aggregate(SRA) and DRA highly affects thc qualifies of recycled aggregate. The compressive strength of recycled aggregate concrete was not highly different in comparison with that of control concrete. But the resistance to penetration of Cl in recycled aggregate concrete was shown smaller than that of control concrete because of adhered mortar on recycled aggregate. The resistance to frcezing and thawing of recycled aggregate concrete was highly different due to adhered mortar on recycled aggregate, and durability factor of concrete with NA-SRA and DRA was more decreased than that of control concrete. On the other hand, durability factor of concrete with AA-SRA was larger than that of control concrete. It, therefore, is necessarily required that recycled aggregate including adequate entrained air should be used for satisfying the freez and thaw durability of recycled aggregate concrete.
Keywords
source-concrete recycled aggregate; demolished-concrete recycled aggregate; entrained air; durability factor; freeze and thaw durability;
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