| Summary: | 碩士 === 國立中興大學 === 土木工程學系 === 85 === One of the main objectives of this study is to research the
cement replacement effects on workability and strength
properties of concrete with high volume fly ash and slag of
various proportion and replacement amounts, besides which, the
other is try to find the available replacement amounts of fine
aggregate with fly ash by means of sand replacement. The medium
and high strength concrete were created under different water-
cementitious ratio, the dosages of superplasticizers needed was
adjusted at a given Test results reveal that in cement
replacement, the more contents of fly ash concrete mixed, the
more dosages of superplasticizers concrete needed, and the lower
value of and Ec concrete gained at the same age. Therefore,
the cement replacing by slag is better than by fly ash for
strength requirement. And 54% replacement of cement by weight is
available if economic considerations is a principal reason.
Besides, in sand replacement, the water contents required are
increased with replacement amounts, and the proper replacement
amount shouldn*t be too large. But the adjusted method of water
contents needs advanced research.
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