Abstract
To investigate bond-slip behavior of reinforcement in high volume fly ash concrete (HVFAC), 189 pull-out specimens are studied under monotonic static load in this paper. The main research variables involve the volume of fly ash, the type and diameter of the steel bars and the water-to-cement ratio (w/c). The tensile loading in this study is applied to steel bar, which increases stably by controlling the gradual increase of steel bar’s slip until end of the tests. For each specimen, the complete relationship curve to bond stress and slip are collected. Results indicate that the bond strengths of steel bars increased along with the decrease of the w/c ratio and decreased when the diameter of steel bar increased. Other results also show that the type of steel bar has a significant influence on bond and slip behavior and similar bond-slip relationship curves are presented in HVFAC, compared to conventional concrete (CC). To assess the feasibility of existing bond strength models in HVFAC, predictions from the models are compared with experimental results in the study. Based on the analyses and comparative results, a revised ultimate bond strength model and bond–slip relationship model are proposed to evaluate behavior of deformed steel bar in HVFAC. The first model is affected by the volume of fly ash and could evaluate the bond strengths well, the second one could monitor complete bond-slip curve reasonably. In addition, using the above revisions to the bond behaviors of bar in HVFAC, a simple calculation method for the embedment length of deformed steel bar in the concrete is recommended, because it has a stable design safety reserve.
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Abbreviations
- A s :
-
Gross area of cross section of steel bars
- c :
-
Concrete cover thickness
- c/d :
-
Ratio of thickness of concrete cover to diameter of reinforcement
- d :
-
Diameter of steel bar
- E s :
-
Modulus of elasticity of steel bar
- f′ c :
-
Concrete compressive strength
- f sh :
-
Yield strength of reinforcing bar
- f ck :
-
Characteristic value of concrete strength
- f t :
-
Tensile strength of concrete
- k, k exp :
-
Influence factor and its experimental value
- l a :
-
Embedment length of reinforcing bar
- l ap :
-
Recommended embedment length of steel bar
- s b :
-
Spacing of transverse steel bar in concrete
- s m :
-
Measured slip values of bar at loaded end
- s e :
-
The elastic elongation of steel bar
- s i :
-
Specified slip level in CEB-FIP model/fib model code
- s u :
-
The slip at loaded end corresponding to the ultimate bond stress
- x :
-
Mass ratio of fly ash to cement in concrete
- w/c :
-
Water to cement ratio
- T :
-
Applied axial tensile load
- ρ sv :
-
Volumetric ratio of transverse reinforcement
- τ cr :
-
Bond stress at cracking of concrete
- τ u :
-
Ultimate bond stress of bar in concrete
- τ uFA :
-
Bond strength of fly ash concrete
- τ uFA (x):
-
Bond strength of deformed steel bars in fly ash concrete
- τ uGB :
-
Bond strength based on GB50010 code
- τ max :
-
Bond strength of bar in concrete in CEB-FIP model/fib model code
- τ ucal :
-
Calculated bond strength of bar in models
- τ uexp :
-
Experimental bond strength of bar in concrete
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Zhao, J., Cai, G. & Yang, J. Bond-slip behavior and embedment length of reinforcement in high volume fly ash concrete. Mater Struct 49, 2065–2082 (2016). https://doi.org/10.1617/s11527-015-0634-2
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DOI: https://doi.org/10.1617/s11527-015-0634-2