The fatigue threshold (also known as the endurance limit) is the stress level in a material below which fatigue failures will normally not occur.

At high loading rates, the strength of concrete decreases.

The term “concrete strength” refers to the uniaxial _______ strength.

The long term strength of concrete that is hot cured will be _______ concrete that is cold cured.

Load combinations are presented in companion action format.

Given that dead load = 50 psf, live load = 25 psf, roof live load = 25 psf, snow load = 30 psf, and wind load = 45 psf, determine the largest factored load.

The 7- and 28-day strengths are reduced by cold temperatures, although the long-term strength tends to be enhanced.

Which of the following does not affect compressive strength?

A group of 25 tests on a given type of concrete had a mean strength of 4,000 psi and a standard deviation of 400 psi. Does this concrete satisfy the strength requirement for 4,000 psi concrete?

A higher water/cement ratio reduces the porosity of the hardened concrete and thus increases the number of interlocking solids.