Hiroaki MATSUZAKI
Experimental Investigation of Fresh and Hardened Properties of Concrete Used Fly Ash that Obtainable in Niigata
Takumi SHIMOMURA
Alkali-aggregate reaction (ASR) in concrete is known to result in expansion and cracking that causes deterioration of the structure. Moreover, the expansion of concrete due to ASR sometimes causes rupture of reinforcing steel in concrete.
Although it is apparent that the best way to avoid ASR is not to use alkali-reactive aggregate in fresh concrete, we have many difficulty to use suitable aggregate because of limited obtainable resource in our region. To control the ASR reactivity, however, we can use fly ash as an additive. The use of fly ash also makes significant benefits such as improvement of concrete performance, making it stronger, more durable, as well as resistant to expansion and cracking.
The present study has focused on properties of fly ash concrete mixed with natural aggregate, which can be obtained in Niigata prefecture. In addition, to be beneficial from a technical point of view, systematic experiment was performed, considering shrinkage cracking, carbonation, diffusivity of chloride iron, freezing and thawing resistance, and other related durability properties of concrete. As a result of experiment, comprehensive performance of fly ash concrete become clear.
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