True or False:

$1-$ Portland cement density $(k\frac{g}{m^3})$ is higher than concrete density $(k\frac{g}{m^3}).$

Response: False.

$2-$ Increasing w$/$c reduces the compressive strength

Response: True

$3-$ The diffusion of chloride ions in concrete pore water is due to capillary suction.

Response: False.

$4-$ Steel is in passive condition in concrete due to the high pH of the concrete pore water.

Response: True.

$5-$ C$2$ is most severe exposure condition considered in AS$5100\mathrm{.}5$ and AS$3600.$

Response:

$6-$ Steel corrosion in concrete: electrons $($e$)$ are travelling from the anode to the cathode

through the electrolyte.

Response:

$7-$ Steel corrosion in concrete: dissolution of steel occurs at the cathodic surface.

Response:

$8-$ In permanently submerged condition, corrosion of steel is slow due to the lack of oxygen.

Response:

$9-$ Chloride binding capacity of concrete is beneficial to the durability as it slows down chloride

ions diffusion.

Response: