Impact Response and Strength Reliability of Green High Performance Fibre Reinforced Concrete Subjected to Freeze-thaw Cycles in NaCl Solution

A drop-weight impact test was conducted to evaluate the impact resistance of Green High Performance Plain Concrete (GHPPC) and Green High Performance Fibre Reinforced Concrete (GHPFRC) subjected to freeze-thaw cycles in water containing 3.0 % NaCl solution. The green high performance concrete mixtures were prepared using 10 % of micro silica as cement replacement, 30 % of copper slag as fine aggregate replacement and hooked end steel fibres were incorporated at 1.0 % volume fraction. All the specimens were frozen and thawed for 25 cycles, following which the impact strength of the frozen and thawed specimens was determined. Due to the variations in impact test results, a reliability analysis was carried out using two parameter Weibull distribution and its Weibull parameters were determined using two methods viz., Energy pattern factor method (EFM) and Method of Moments (MOM). Furthermore, impact strength in terms of reliability was reported using the average value of Weibull parameters obtained from these two methods. The results revealed that impact resistance of GHPPC and GHPFRC specimens subjected to 25 cycles of freeze and thaw in water containing 3% NaCl solution was significantly reduced.