高流動化濟를 使用한 볏짚재 콘크리트의 工學的 特性 = Engineering Properties of Rice Straw Ash Concrete Using Superplasticizer

다국어 초록 (Multilingual Abstract)

This study was performed to evaluate engineering properties of rice straw ash concrete made by using straw ash, cement, natural sand, gravel and superplasticizer
The following conclusions were drawn;
1. The unit weight was in the range of 2,231~2,293kgf/㎤, the unit weights of those concrete were decreased 1~3% than that of the normal cement concrete.
2. The highest strength was achieved by 5% filled rice straw ash concrete, it was increased 19% by compressive strength, 53% by tensile strength and 16% by bending strength than that of the normal cement, concrete, respectively. The strength ratio of rice straw ash concrete was higher than that of the normal cement concrete.
3. The ultrasonic pulse velocity was in the range of 4,084~4,336m/s, which was showed about the same compared to that of the normal cement concrete. The highest ultrasonic pulse velocity was showed by 5% filled rice straw ash concrete.
4. The dynamic modulus of elasticity was in the range of 294×10^3~347×10^3kgf/㎠, which was showed about the same compared to that of the normal cement concrete. The highest dynamic modulus of elasticity was showed by 5% filled rice straw ash concrete.
5. The static modulus of elesticity was in the range of 266×10^3~328×10^3kgf/㎠, which was showed about the same compared to that of the normal cement concrete. The poisson's number of rice straw ash concrete was less than that of the normal cement concrete.
6. The acid-proof was increased with increase of the content of rice straw ash. It was 1.33 times of the normal cement concrete by 10% filled rice straw ash concrete and 1.47 times by 15% filled rice straw ash concrete, respectively.
7. The durability factor(DF)was in the range of 85.48~86.33 in 2.5%, 5%, 7.5% filled rice straw ash concrete. Those was showed higher than that of the normal cement concrete.
But, DF of 10%, 12.5%, 15% filled rice straw ash concrete was in the range of 41.26~65.34. Those was showed lower than that of the normal cement concrete.
8. Accordingly, if we use suitable quantity of rice straw ash as a replacement of cement, it will greatly improve engineering properties of concrete.

목차 (Table of Contents)

• I. 서론 = 1
• II. 재료 및 방법 = 3
• 2.1 사용재료 = 3
• 2.1.1 시멘트 = 3
• 2.1.2 골재 = 3
• 2.1.3 볏짚재 = 4
• 2.1.4 고성능 감수제 = 4
• 2.1.5 황산 = 5
• 2.2 공시체 제작 = 5
• 2.2.1 콘크리트 배합 = 5
• 2.2.2 공시체 제작 및 양생 = 6
• 2.3 시험방법 = 7
• 2.3.1 단위중량시험 = 7
• 2.3.2 강도시험 = 7
• 2.3.3 초음파진동속도시험 = 8
• 2.3.4 동탄성계수시험 = 8
• 2.3.5 정탄성계수시험 = 9
• 2.3.6 내산성시험 = 10
• 2.3.7 동결용해저항성시험 = 10
• III. 결과 및 고찰 = 12
• 3.1 단위중량 = 12
• 3.2 강도 = 13
• 3.2.1 압축강도 = 13
• 3.2.2 인장강도 = 15
• 3.3.3 휨강도 = 16
• 3.2.4 각 강도와의 관계 = 17
• 3.2.5 강도비 = 18
• 3.3 초음파진동속도 = 19
• 3.4 동탄성계수 = 21
• 3.5 정탄성계수와 포아손비 = 22
• 3.5.1 정탄성계수 = 23
• 3.5.2 포아손비 = 24
• 3.6 내산성 = 25
• 3.7 동결융해저항상 = 27
• IV. 결론 = 33
• 참고문헌 = 35
• ABSTRACT = 38