Physical-durable performance of concrete incorporating high loss on ignition-fly ash

International Conference on Materials Engineering and Applications

Huynh, Trong-Phuoc^1 ; Ngo, Si-Huy^2 ; Hwang, Chao-Lung^3

Department of Rural Technology, College of Rural Development, Can Tho University, Campus II, 3/2 St., Ninh Kieu Dist., Can Tho City

900000, Viet Nam^1

Department of Engineering and Technology, Hong Duc University, No. 565, Quang Trung Street, Thanh Hoa City

440000, Viet Nam^2

Department of Civil and Construction Engineering, National Taiwan University of Science and Technology, No. 43, Keelung Rd., Taipei

10607, Taiwan^3

关键词: Concrete properties;    Concrete samples;    Durability performance;    Fly ash concrete samples;    Fly ash concretes;    Resistance to sulfate attack;    Sulfate resistance;    Ultrasonic pulse velocity;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/348/1/012014/pdf
DOI  :  10.1088/1757-899X/348/1/012014

来源: IOP

【 摘 要 】

This study investigates the feasibility of using raw fly ash with a high loss on ignition in concrete. The fly ash-free concrete samples were prepared with different water-to-binder (w/b) ratios of 0.35, 0.40, and 0.45, whereas the fly ash concrete samples were prepared with a constant w/b of 0.40 and with various fly ash contents (10%, 20%, and 30%) as a cement substitution. The physical properties and durability performance of the concretes were evaluated through fresh concrete properties, compressive strength, strength efficiency of cement, ultrasonic pulse velocity, and resistance to sulfate attack. Test results show that the w/b ratio affected the concrete properties significantly. The incorporation of fly ash increased the workability and reduced the unit weight of fresh concrete. In addition, the fly ash concrete samples containing up to 20% fly ash exhibited an improved strength at long-term ages. Further, all of the fly ash concrete samples showed a good durability performance with ultrasonic pulse velocity value of greater than 4100 m/s and a comparable sulfate resistance to the no-fly ash concrete.