| 1. |
- Zandi, Kamyab, 1981, et al.
(author)
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Experimental study of the material and bond properties of frost-damaged concrete
- 2011
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In: Cement and Concrete Research. - : Elsevier BV. - 0008-8846 .- 1873-3948. ; 41:3, s. 244-254
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Journal article (peer-reviewed)abstract
- In an extensive experimental investigation, several types of tests were conducted on a reference specimen and frost-damaged concrete. Two levels of internal frost damage were quantified by the relative dynamic modulus of elasticity and compressive strength. Test results showed a significant influence of freeze-thaw cycles on the compressive strength and even more influence on the modulus of elasticity and the compressive strain at peak stress. Reduced tensile strength and increased fracture energy were measured. From inverse analysis of wedge splitting test results, a significant effect of frost on the shape of the tensile stress-crack opening relationship was observed: tensile strength was reduced, while the post-peak behaviour was more ductile for the frost-damaged concrete. Pull-out tests showed the influence of freeze-thaw cycles on bond strength and slip. The pull-out test results are compared with similar tests available in the literature and the effect of frost on bond behaviour is discussed.
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| 2. |
- Zandi, Kamyab, 1981, et al.
(author)
-
Frost-damaged concrete: Part 1. Material properties
- 2009
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In: 4th International Conference on Construction Materials: Performance, Innovations and Structural Implications. ; , s. 753-760
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Conference paper (peer-reviewed)abstract
- In an extensive experimental investigation, several tests were performed on a reference and frost-damaged concrete. The test results showed significant influence of freeze-thaw cycles not only on the compressive strength but, to a larger extent, on the modulus of elasticity and the compressive strain at peak stress. Reduced tensile strength and increased fracture energy were measured. From inverse analysis, significant effect of frost on the shape of the tensile stress-crack opening relationship was observed; i.e. tensile strength was decreased while the post-peak behavior was more ductile for the frost-damaged concrete than for the reference concrete.
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| 3. |
- Zandi, Kamyab, 1981, et al.
(author)
-
Frost-damaged concrete: Part 2. Bond properties
- 2009
-
In: 4th International Conference on Construction Materials: Performance, Innovations and Structural Implications. ; , s. 761-766
-
Conference paper (peer-reviewed)abstract
- In an experimental investigation, pull-out tests were carried out on a reference and frost-damaged concrete. The level of frost damage was quantified by relative dynamic modulus of elasticity calculated from ultrasonic measurements. The test results showed significant influence of freeze-thaw cycles not only on the bond strength but also on the slip at the maximum bond. However, similar residual bond strength was observed for the reference and frost-damaged concrete. Finally, the results were compared with pull-out tests of frost-damaged concrete available in literature and the bond capacity and slip at maximum bond were discussed.
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| 4. |
- Zandi, Kamyab, 1981, et al.
(author)
-
Influence of frost on the bond between steel and concrete
- 2012
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In: Proceeding of the Fourth International Conference on Bond in Concrete. ; 1, s. 483-490
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Conference paper (peer-reviewed)abstract
- One of the severe types of deterioration in concrete structures is associated with the volume expansion of concrete caused by freezing and thawing of concrete. Frost damage in concrete is caused by the volume expansion of freezing water in the concrete pore system. Thereby, tensile stresses are initiated and micro and macro-cracks are introduced into the concrete body, which leads to a type of severe damage known as internal frost damage. This mechanism not only affects the material properties of concrete such as tensile and compressive strength and elastic modulus of concrete, but also, influences the bond strength between the reinforcement and surrounding concrete in damaged regions.
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