Civil and Environmental Engineering Answers

The design engineer specifies a concrete strength of 5500 psi. Determine the required

average compressive strength for:

a. A new plant where s is unknows

b. A plant where s = 500 psi for 22 test results

c. A plant with extensive history of producing concrete with s = 400 psi

d. A plant with extensive history of producing concrete with s = 600 psi

A rectangular box with a square base and no top is to have a volume of 108 cubic inches. Find the dimensions for the box that require the least amount of material.

What vector type ( point, line, or polygon) best represents the following features; state boundaries,cities,stream networks,mountain peaks,soil types, flight tracks. Which of the above features may be represented by multiple vector type ? And what conditions may lead you to choose one vector over the other

Discuss four alternatives that increase the use and application of conventional concrete.

What are the advantages of using a third-point loading flexure test over a

center-point loading flexure test? Draw a shear force diagram and a bending

moment diagram for each case to support your answer.

What is the purpose of performing the flexure test on concrete? How are the

results of this test related to the compressive strength test results?

What is the standard size of PCC specimens to be tested for compressive

strength? If a smaller size is used, which size is expected to provide higher

compressive strengths? Why? Which size provides strengths close to that of

an actual concrete structure?

Discuss four alternatives that increase the use and application of conventional concrete

Discuss the creep response of concrete structures. Provide examples of the effect of creep on concrete structures.

Discuss the change in volume of concrete at early ages