Investigation the Durability Properties of Non-Air Entrained Roller Compacted Concrete Containing Coal Waste Ash against Detrimental Effects of De-Icing Salts

Document Type : Original Article

Authors

1 Noshirvani University of Technology, Mazandaran, Babol, Iran. and M.Sc., Student, Civil Engineering Department, Noshirvani University of Technology, Mazandaran, Babol, Iran.

2 Associate Professor, Civil Engineering Department, Noshirvani University of Technology, Mazandaran, Babol, Iran.

Abstract

The aim of this study is feasibility of using Coal Waste Ash (CWA) as partial replacement of cement in non-air entrained Roller Compacted Concrete Pavement (RCCP) and evaluating its durability against deicing salts effect. In this research, 4 different mix designs were used to prepare RCC samples. The cement content equivalent to 14% by mass of dry materials was selected for control mixture without CWA. In other mixture, 2, 3 and 4% (by mass of dry materials) CWA was used. In order to evaluation the durability, chloride ion penetration, deicing salt surface scaling resistance and freeze-thaw resistance exposed to salt solution were performed. According to results, all mixture in this research obtained acceptable chloride ion penetration. The mixture with 3 and 4% CWA showed the highest and lowest chloride ion resistance respectively. By increasing CWA contents to amount of 3%, surface scaling exposed to salt solution in RCC samples delayed approximately 5 cycles. However, start of surface scaling in mixture containing 4 % CWA occurs in lower cycles compare to other sample. At the end of surface scaling test, weight changes in samples containing 2 or 3% CWA is almost the same as controls mixture. Up to 180 freeze-thaw cycles in presence of salt solution, ultrasonic pulse velocity in control mixture is higher compare to other sample. While, the reduction of this parameter is lowest for 3% CWA samples at the end of the freeze-thaw test. Based on ultrasonic pulse velocity during 300 freeze-thaw cycles, control, 2 and 3% CWA samples have excellent resistance. Mixture containing 4% CWA have excellent resistance during 180 freeze-thaw cycles. However its resistance decreased in continues. Relative dynamic modulus of elasticity during 300 freeze-thaw cycles is almost the same for control, 2 and 3% CWA samples. While this parameter for mixture containing 4% CWA reduced more than 40% at the end of freeze-thaw cycles. The durability factor at the end of freeze-thaw test, are satisfactory for control mixture and samples containing 2 and 3% CWA.
 
 

Keywords


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