Abstract
Two sets of roller‐compacted concrete (RCC) samples cured for 28 days were subjected to freeze‐thaw (F‐T) cycles and immersion in laboratory conditions. F‐T cycles in water and water‐potassium acetate solution (50% by weight) were carried out and followed by the flexural impact test. The weight loss, the dynamic elastic modulus (Ed), the mechanical properties, and the residual strain of RCC were measured. The impact energy was calculated based on the final number of the impact test. The results show that the effect of F‐T cycles in KAc solution on the weight loss and Ed of RCC is slight. Ed, the compressive strength, and the flexural strength of RCC with 250 F‐T cycles in KAc solution decrease by 3.8%, 23%, and 36%, respectively. The content (by weight) of K+ at the same depth of RCC specimens increases with the increase of F‐T cycles. The impact energy of RCC specimens subjected to 250 F‐T cycles in KAc solution decreases by nearly 30%. Microcracks occur and increase with the increase of F‐T cycles in KAc solution. The compressive strength of RCC immersed in KAc solution decreases by 18.8% and 32.8% after 6 and 12 months. More attention should be paid to using KAc in practical engineering because both the freeze‐thaw cycles and the complete immersion in KAc solution damage the mechanical properties of RCC.
Highlights
Roller-compacted concrete (RCC) is a zero-slump concrete compacted with vibratory and rubber-tired rollers [1]
For the materials used and test methods applied, the following conclusions can be drawn: (1) e effect of freeze-thaw cycles in KAc solution on the weight loss and the elastic modulus of RCC is slight. e elastic modulus of RCC with 250 freezethaw cycles decreases by 3.8%
(2) 250 freeze-thaw cycles in KAc solution decrease the compressive strength and the flexural strength by 23% and 36%, respectively. e content of K+ at the same depth of RCC specimens increases with the increase of freeze-thaw cycles, which reduces the decreasing trend of the compressive strength caused by freeze-thaw cycles in KAc solution
Summary
Roller-compacted concrete (RCC) is a zero-slump concrete compacted with vibratory and rubber-tired rollers [1]. RCC has been used in the construction of dams, pavements, and airport runways because of the lower cost and the easier placement operations [2,3,4]. RCC requires long-term stable performance when it is applied in airport runways because reconstruction causes a great impact on the air travel industry. The mechanical properties of RCC have been widely recognized, its frost resistance is still the focus in this field. E investigation showed that RCC with a reasonable mixture composition [6], casting and curing process [7, 8] had a good frost resistance. RCC had better salt frost resistance when it was mixed with mineral admixtures [9]. The results reported by ACI Committee 325 [11] had shown that RCC mixtures were easy to damage by F-T cycles
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