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Experimental investigation on uniaxial tensile creep behavior of cracked steel fiber reinforced concrete
Abstract This paper mainly investigates the uniaxial tensile creep behavior of pre-cracked steel fiber reinforced concrete. Hooked-end fiber RC65/60BN with fiber dosage of 80 kg/$ m^{3} $ was used with normal strength concrete. A suitable tensile creep frame and a pre-cracking test set-up were developed. Cylindrical specimens were pre-cracked at crack opening displacement (COD) of 0.05 and 0.2 mm respectively before the tensile creep test. The pre-cracked specimens were loaded at a load level of 30 % of the maximum pre-cracking load $$P_{\max }$$. The specimens were unloaded after 3 months and then reloaded to 60 % of $$P_{\max}$$. Time dependent COD were continuously measured by LVDTs under constant temperature of 20° and relative humidity of 60 %. The measured time dependent COD $$W_{\rm total}$$ was considered as the summation of three parts, the irreversible part $$W_{\rm irr}$$, the instantaneous part $$W_{\rm inst}$$ and the creep part $$W_{\rm creep}$$. It was observed that $$W_{\rm irr}$$ and the loading level have a great impact on the tensile creep behavior. For the specimens with a pre-cracking COD of 0.05 mm, the maximum creep deformation $$W_{\rm creep}$$ is almost the same as the initial instantaneous deformation $$W_{isnt.}$$ after 3 months loading. For the specimens pre-cracked at 0.2 mm, the damage evolution at the fibre/matrix interface in terms of irreversible crack opening and load level is also discussed. It is interesting to be noted that the creep deformation under load level of 30 % will not introduce extra damage even though the $$W_{\rm irr}$$ increases.
Experimental investigation on uniaxial tensile creep behavior of cracked steel fiber reinforced concrete
Abstract This paper mainly investigates the uniaxial tensile creep behavior of pre-cracked steel fiber reinforced concrete. Hooked-end fiber RC65/60BN with fiber dosage of 80 kg/$ m^{3} $ was used with normal strength concrete. A suitable tensile creep frame and a pre-cracking test set-up were developed. Cylindrical specimens were pre-cracked at crack opening displacement (COD) of 0.05 and 0.2 mm respectively before the tensile creep test. The pre-cracked specimens were loaded at a load level of 30 % of the maximum pre-cracking load $$P_{\max }$$. The specimens were unloaded after 3 months and then reloaded to 60 % of $$P_{\max}$$. Time dependent COD were continuously measured by LVDTs under constant temperature of 20° and relative humidity of 60 %. The measured time dependent COD $$W_{\rm total}$$ was considered as the summation of three parts, the irreversible part $$W_{\rm irr}$$, the instantaneous part $$W_{\rm inst}$$ and the creep part $$W_{\rm creep}$$. It was observed that $$W_{\rm irr}$$ and the loading level have a great impact on the tensile creep behavior. For the specimens with a pre-cracking COD of 0.05 mm, the maximum creep deformation $$W_{\rm creep}$$ is almost the same as the initial instantaneous deformation $$W_{isnt.}$$ after 3 months loading. For the specimens pre-cracked at 0.2 mm, the damage evolution at the fibre/matrix interface in terms of irreversible crack opening and load level is also discussed. It is interesting to be noted that the creep deformation under load level of 30 % will not introduce extra damage even though the $$W_{\rm irr}$$ increases.
Experimental investigation on uniaxial tensile creep behavior of cracked steel fiber reinforced concrete
Zhao, Guanyu (author) / di Prisco, Marco (author) / Vandewalle, Lucie (author)
2014
Article (Journal)
English
| British Library Online Contents | 2015
Uniaxial tensile creep of a cracked polypropylene fiber reinforced concrete
| Springer Verlag | 2018