Effect of Kinds of Binder and Curing Conditions on Durability of Super-Workable Concrete

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Title: Effect of Kinds of Binder and Curing Conditions on Durability of Super-Workable Concrete

Author(s): S. Ushijima, K. Harada and H. Taniguchi

Publication: Special Publication

Volume: 170

Issue:

Appears on pages(s): 1007-1008

Keywords: Carbonation; cement types; cold weather construction; concretes; durability; freeze thaw durability; tests.

Date: 7/1/1997

Abstract:
In this report, freezing and thawing test, carbonation test and length change test were carried out, determine the effects of differences in cement kind and curing methods on the durability of super-workable concrete, focusing mainly on placing during cold weather. Normal portland cement and three kinds of low heat type cement were used. A w/c of 50% was used for the normal portland cement, and a ratio of between 3O~35% for the low heat type cement. The curing methods of the specimens are standard curing, atmospheric curing, site sealed curing, site water curing and heat curing. During freezing and thawing test and accelerated carbonation tests, it was found that when heat curing is employed to prevent initial frost damage, if due consideration is not given to the temperature and wetness conditions of the curing concrete, there are cases where durability may be worsened instead of improved. With regard to the measurement of length change by the test methods adopted in current standards, there is a distinct possibility that the measurement values are not only due to drying shrinkage, but are also strongly influenced by autogeneous shrinkage of the concrete