| Title |
Spalling Prevention of High Strength Concrete with 60~100MPa of the Compressive Strength Corresponding to the Addition of Polypropylene Fiber |
| Authors |
Han Cheon-Goo ; Yang Seong-Hwan ; Han Min-Cheol ; Pei Chang-Chun |
| Keywords |
High Strength Concrete ; Spalling Resistance ; Polypropylene Fiber |
| Abstract |
This paper presents the results of spalling occurrence and residual strength of the high strength concrete with 60~100 MPa (W/B 15~35%) subjected to fire depending on PP fiber contents. It is found that addition of above 0.25% of PP fiber resulted in protecting from spalling occurrence of the ultra high strength concrete with W/B of 15%. On the other hand, such amount of PP fiber led to a reduction of fluidity of fresh concrete, and thereby, increase of superplasticizer dosages or replacement of fiber or change of method is necessary for practical application at the job site. Proper amount of PP fiber for protecting from spalling is found to be more than 0.1% in the high strength concrete with W/B of 25% and 35%, and such amount of PP fiber did not affect the fluidity of fresh concrete significantly. Therefore, optimum amount of PP fiber to protect from spalling is determined to be 0.10% in the region of 60~80 MPa of the high strength concrete. |