The standard compressive strength acceptance test is performed on concrete cylinders that are how old?

Prolonged moist curing leads to higher concrete strength.

This shrinkage occurs without the loss of moisture due to hydration reactions.

What does the “c” represent in f’c?

Drying shrinkage occurs in carbon-dioxide rich atmospheres.

The three most common durability problems in concrete structures are corrosion of steel in the concrete, breakdown of the structure of the concrete due to freezing and thawing, and breakdown of the structure of the concrete due to a chemical attack.

There is a permanent reduction in strength when concrete is exposed to sustained high loads.

A concrete cube is subjected to biaxial loading. Estimate the compressive strength σ1 if σ2 = 0.8 times the compressive strength, in compression.

Strength of concrete tends to decrease as the maximum aggregate size decreases.

Which of the following is not a common durability problem in a concrete structure.