混和劑 添加量에 따른 콘크리트의 物理的性質 變化 比較 試驗 = A Study on the Physical Properities an Variety of Comparative Experment by Admixtures and Additives in Convrete

다국어 초록 (Multilingual Abstract)

Admixtures are used to modify the properties of concrete, such as to improve workability, increase strength, retard or accelerate strength development, and increase frost resistance.
In order to improved the qualities of concreate, altered the water-cement ratio to 6.5%. 60%, 55% in general concrete.
Selected each one of the typical agent among the four kinds of admixtures and additives.
Sample is as follows; (1) Fly-ash, (2) Vinsol resim, (3) Calcium chlorid, (4) Pozzolith No.5.
Additional quantity of admixtures were changed four steps, and measured the value of slump testing at 15, 30, 60, 120 minute each, and the value of absorption ratio at 1, 5 24 hrs each.
In this study, concreste specimens were in accordance with the Korean Standards Specification for concrete.
In the tests, for compressive strength, bond strength of specimens were measured at following age.
Test of age ; 1-day , 3-days, 7-days, 28-days, 90-days. The results of obtained from the experimental analyses are summarized as follow;
1. It is possible to get the concrete of strength the same as concreter of using admixtures in general concrete in an occasion carring out thoroughly, but general concrete is inperior absolutely compare with the concrete of using admixtures, in workablility and absorption.
2. Fly-ash is very useful and economical material any other admixtures, to improve of workablility and strength, absorption, but early-strength is lower than the any others. So, can use to unnecessary structures of early-strength. Moderate tolerance of replacement quantity is 10-20 percent in the weight of cement per unit.

목차 (Table of Contents)

• Ⅰ. 緖論
• Ⅱ. 硏究史
• Ⅲ. 材料 및 方法
• Ⅳ. 結論
• 參考文獻