1.An object weighs 289.2N in air and 186.9N in oil of specific gravity is 0.75 find its volume and relative denesity
2.If concrete compression test fails, should Schmidt hammer test be adopted as an alternative test to prove the concrete strength?
3.Which type of bar reinforcement is more corrosion resistant, epoxy-coated bars, stainless steel bars or galvanized bars?
4.Does the presence of rust have adverse impact to the bond performance of bar reinforcement?