Abstract
Through laboratory testing, this research studied the connection between air-void structures of hardened concrete and fresh concrete and discussed the effects of the air-void structure on the salt-frost durability of the concrete. The results demonstrate that, in comparison with fresh concrete, the air-void spacing factor shows a close correlation with hardened concrete air-content and decreases in the form of a power function as the air-content increases. When the fresh concrete air-content is more than 6% and the hardened concrete air-void spacing factor is less than 0.18 mm, the influence of parameters of air-void structure on the salt-frost resistance of the concrete reduces. The air-void spacing factor more significantly affects the salt-frost resistance of the concrete compared with air content and the correlation reaches 0.93. Therefore, air-content and air-void spacing factor are recommended for dual control.
Highlights
Deicing salt inducing salt-frost damage to road and bridge concrete in cold regions has been an important adverse factor for the durability of concrete structures
After air entrainment in the concrete, air voids are able to effectively buffer diverse stress generated in cement mortars, taking on the function as a buffer airbag [3]
The relationship between air contents of fresh concrete and hardened concrete determined by the 457 image wasthe studied and results are shown incontent by the RapidAir
Summary
Deicing salt inducing salt-frost damage to road and bridge concrete in cold regions has been an important adverse factor for the durability of concrete structures. Air-void testing technology [5] has been gradually developed from a single index (i.e., air content of fresh concrete in the early stages into multi-index, such as air-void spacing factor and air-void specific surface area of hardened concrete currently). This leads to in-depth researches on the salt-frost resistance of concrete. Previous studies [9,10] reveal that, except for air-void structures, surface conditions have great effects on the salt-frost resistance of concrete. In view of the salt-frost durability of concrete, control indexes (i.e., appropriate air content and air-void spacing factor) were put forward
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
