A concrete cube is subjected to biaxial loading. Estimate the compressive strength σ2 if σ1 = 0.2 times the tensile strength, in tension.

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A group of 35 tests on a given type of concrete had a mean strength of 5,000 psi and a standard deviation of 600 psi. Does this concrete satisfy the strength requirement for 5,000 psi concrete?

The concrete containing Type I cement in a structure is cured for 4 days at 65°F, followed by 3 days at 75°F. Use the maturity concept to estimate its strength as a percentage of the 28-day strength under standard curing. Maturity is defined as M = Σ(Ti + 50)(ti) where Ti is in degrees F and ti is in days.

The concrete containing Type I cement in a structure is cured for 2 days at 61°F, followed by 3 days at 65°F. Use the maturity concept to estimate its strength as a percentage of the 28-day strength under standard curing. Maturity is defined as M = Σ(Ti + 50)(ti) where Ti is in degrees F and ti is in days.

The concrete containing Type I cement in a structure is cured for 2 days at 71°F, followed by 5 days at 75°F. Use the maturity concept to estimate its strength as a percentage of the 28-day strength under standard curing. Maturity is defined as M = Σ(Ti + 50)(ti) where Ti is in degrees F and ti is in days.

The concrete in the core of a spiral column is subjected to a uniform confining stress σ3 of 690 psi. What will the compressive strength σ1 be? The unconfined uniaxial compressive strength is 3,400 psi.

A group of 25 tests on a given type of concrete had a mean strength of 4,400 psi and a standard deviation of 600 psi. Does this concrete satisfy the strength requirement for 3,500 psi concrete?

The concrete containing Type I cement in a structure is cured for 3 days at 35°F, followed by 5 days at 41°F. Use the maturity concept to estimate its strength as a percentage of the 28-day strength under standard curing. Maturity is defined as M = Σ(Ti + 50)(ti) where Ti is in degrees F and ti is in days.

A dried blood clot that is formed over a skin wound to stabilize and protect the area is called _____.