Influence of Freeze-Thaw Damage on the Steel Corrosion and Bond-Slip Behavior in the Reinforced Concrete

Abstract

This paper mainly studies the behavior of steel corrosion in various reinforced concrete under freeze-thaw environment. The influence of thickness of concrete cover is also discussed. Additionally, the bond-slip behavior of the reinforced concrete after suffering the freeze-thaw damage and steel corrosion has also be presented. The results show that the freeze-thaw damage aggravates the steel corrosion in concrete, and the results become more obvious in the concrete after suffering serious freeze-thaw damage. Compared with the ordinary concrete, both air entrained concrete and waterproofing concrete possess better resistance to steel corrosion under the same freeze-thaw environment. Moreover, increasing the thicknesses of concrete cover is also an effective method of improving the resistance to steel corrosion. The bond-slip behavior of reinforced concrete with corroded steel decreases with the increase of freeze-thaw damage, especially for the concrete that suffered high freeze-thaw cycles. Moreover, there exists a good correlation between the parameters of bond-slip and freeze-thaw cycles. The steel corrosion and bond-slip behavior of reinforced concrete should be considered serious under freeze-thaw cycles environment, which significantly impact the durability and safety of concrete structure.

Influence of the Type of Cement and the Addition of an Air-Entraining Agent on the Effectiveness of Concrete Cover in the Protection of Reinforcement against Corrosion

“…As a result, the possibility of chloride ions penetrating into the cover is limited—the capillary absorption coefficient of chlorides in air-entrained concretes is lower than in concretes in which no air-entraining agent was used. Thus, the corrosion of the reinforcement is limited [ 50 ].…”

Evaluation Method of Relative Humidity Changes in Below-Grade Concrete Structure Space Depending on Different Waterproofing Material and Installation Method

“…Zhu et al studies the behavior of steel corrosion under freeze-thawing environment and the study results show that freeze-thaw damage aggravates the steel corrosion in concrete. Their studies also reveal that concrete with waterproofing properties are more resistant to corrosion under freeze-thaw conditioning [5]. These factors indicate that humidity and moisture control in the concrete structure is required.…”

“…Waterproofing installation methods in below-grade concrete structures[5]; (a) positive-side waterproofing design and (b) negative-side waterproofing design.…”

Study of the Frost Resistance of HDFC Based on a Response Surface Model and GM (1,1) Model

“…Based on the freeze-thaw tests, the first cumulative value (1-AGO) and background value of the relative Advances in Materials Science and Engineering dynamic elastic modulus of HDFC are shown in Table 6. e HDFC relative dynamic elastic modulus prediction model and model parameters a and b for PVA fibers with different lengths and different dosages were calculated using formulas (4) - (12), as shown in Table 7. 7.…”

“…e loss of freeze-thaw damage is particularly serious, which affects the service life of structures and leads to great economic losses [7,8]. erefore, it is of great significance to study how to improve the frost resistance of concrete structures and evaluate the frost resistance of concrete structures for the reinforcement and maintenance of concrete structures under extreme weather conditions [9][10][11][12][13].…”