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영어

High effectiveness of concrete need to improve work-capacity, through concrete capacity improvement. The quality characteristics of concrete using high-range water reducer in domestic market are evaluated in order to put to practical use of high performance concrete with high mobility, high strength and high durability. This study discusses the fluidity and strength properties of cement mortar mixed according to the addition ratio and type of high-range water reducer. The purpose of study is a fundamental study on performance comparison and effect of high-range water reducer.
As a result, The fluidity augment in the addition ratio of high-range water reducer. one of the most fluidity is poly carboxylic acid high-range water reducer. Air content considered that the later addition is bigger than the first addition. Compressive strength analyzed one of the most naphthalene sulphonate of type and 0.5% of addition rate. Also, strength increase in the time. Tensile strength and flexural strength does not undergo a big influence in the addition and type is not.