Civil and Environmental Engineering Answers

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

Discuss five different methods of concrete curing

Perfect Gases

0.675kg of gas at 1.4 MN/m² and 280⁰C is expanded to four times the original volume according to the law PV^1.3 =C Determine:

(a) the original and final volume of the gas,

(b) the final pressure of the gas

(c) the final temperature of the gas

Take R=0.287Kj/kg K

0.1m³ of gas is compressed from pressure of 120KN/m² and temperature 25⁰C to a pressure of 1.2MN/m² according to the law PV^1.2 = constant.

Determine,

(a) The work transferred during the compression,

(b) The change in internal energy,

(c) The heat transferred during the compression

Assume , c_v=0.72kJ/kgK         and           R=0.285KJ/kgK