| Title |
A Prediction Model of Shrinkage Cracking of Steel Fiber Reinforced Concrete |
| Authors |
Choi, Ha-Jin ; Choi, Kyung-Kyu ; Choi, Oan-Chul ; Hwang, Yong-Jae |
| Keywords |
Prediction Model of Shrinkage Cracking ; Steel Fiber ; Fiber Reinforced Concrete |
| Abstract |
On the basis of dry shrinkage tests of fiber reinforced concrete performed in the previous study, an analytical model was developed to predict the cracking time of concrete in ring test. Due to the geometrical characteristics of the ring type restrained shrinkage test, differential shrinkage causes complex tensile stress in concrete ring. For simplicity in application, the ring test specimens were idealized as linear specimens and the degree of restraint was defined considering displacement compatibility between steel and concrete rings. The tensile stress in ring test specimens was also defined using elastic modulus of concrete and free dry shrinkage strain. The tensile strength of concrete was derived from CEB-FIP model based on flexural test results. In the proposed model, cracking development tine is determined at the intersection between tensile stress and tensile strength curves of concrete ring. Compared with existing test results the proposed model shows reliable prediction of the crack development time. |