By now, you should have listened to the audio lecture, read the chapter, and taken the self-assessment and quiz. For this discussion activity, I want you to respond to the following question in the Discussion area in this learning module.

• Clamshells are one of the special excavator types and sometimes clamshells are compared with draglines. List and discuss at least three different points between the two (Dragline vs. Clamshell) in terms of operations, productivity, etc. Do research on the internet, if necessary.

Same as Problem 13.5.A, except span = 18 ft, superimposed dead load = 50 psf, live load = 75 psf, f ′ c = 4 ksi, fy = 60 ksi.

*Problem 13.5.A: A one-way solid concrete slab is to be used for a simple span
of 16 ft. In addition to its own weight, the slab carries a superimposed dead
load of 40 psf and a live load of 100 psf. Using the strength method with
f ′c = 3 ksi and fy = 40 ksi, design the slab for minimum overall thickness.

work physiology/thermoregulation of "running the case" onshore oil rig?

Thanks

single choice

Select the correct statement about batch equilibrium test
A.   Through batch equilibrium test, a breakthrough curve can be obtained.
B.   A large soil sample is used in the batch equilibrium test.
C.   The transit time can be determined through batch equilibrium test.
D.   Sorption isotherm can be obtained through batch equilibrium test.

Select the incorrect statement about phased approach for the site characterization
A.   A fixed work plan must be strictly followed in the phased approach.
B.   The on-site interpretation of obtained data can be conducted in the phased approach.
C.   A fixed offsite laboratory is needed for the chemical analysis on the collected samples
D.   Compared with phase I, same sampling strategy, field investigation method and
analytical methods are adopted in phase II and subsequent phases.

single choice

Select the incorrect statement about phased approach for the site characterization

A.   A fixed work plan must be strictly followed in the phased approach.

B.   The on-site interpretation of obtained data can be conducted in the phased approach.

C.   A fixed offsite laboratory is needed for the chemical analysis on the collected samples

D.   Compared with phase I, same sampling strategy, field investigation method and analytical methods are adopted in phase II and subsequent phases.

Which of the following issues may take place in the leachate collection system.

A.   Freezing induced cracks

B.   Reduction of hydraulic conductivity.

C.   Stress cracking

D.   Swelling induced by the hydration process

If you had the opportunity to make a policy recommendation to a high-level federal administrator regarding energy policy for the next 25 years, what would it be and why?

A concrete mix is required for reinforced concrete wave breaker at seashore where frequent mild freezing and thawing is dominant. A specified compressive strength of 25 MPa is required at the age of 28 days, and the size of the section and reinforcement dictate using a maximum aggregate size of 19 mm. The company had no history of testing concrete used. The coarse aggregate meets the ASTM grading requirements. It has absorption of 2%, a BSG (D) of 2.70 and a unit weight of 1550 kg/m3. The fine aggregates have absorption of 1%, a BSG (D) of 2.7 and a fineness modulus of 2.7. Both coarse and fine aggregates are used while dry. For each bag of cement (50 kg); calculate the number of containers of coarse and fine aggregate equivalent to required mass quantities. The volume of each container is 20 liters; and the loose density of the coarse and fine aggregates are 1250 and 1200 kg/m3, respectively.

A concrete for a weave breaker is to be designed at a w/c ratio of 0.45. A maximum size of aggregate of 25 mm was used hence a water content of 200 kg/m3 (with 2% air) was required to achieve satisfactory workability. Both the coarse and fine aggregate conform to the grading requirements of ASTM C33. The fine aggregate having a fineness modulus of 2.4, and an absorption of 2%, a BSG (SSD) of 2.6, whereas the coarse aggregate have a bulk density of 1500 kg/m3; an absorption of 3% and a BSG (SSD) of 2.50. The moisture content for both aggregate is 2%. Compute mixture proportions (in kg/m^3) before and after moisture corrections following ACI procedure.

A concrete column is to be designed at a w/c ratio of 0.40 in an environment where an aggressive F/T persists. A maximum size of aggregate of 19 mm was used. A slump of 30 mm was required to achieve satisfactory workability. Both the coarse and fine aggregate conform to the grading requirements of ASTM C33. The fine aggregate having a fineness modulus of 2.8, and an absorption of 2%, a BSG (SSD) of 2.5, whereas the coarse aggregate have a bulk density of 1450 kg/m3; an absorption of 3% and a BSG (SSD) of 2.50. The moisture content for FA and CA was 4 and 1%, respectively. Compute mixture proportions (in kg/m^3) before and after moisture corrections following ACI procedure.

A soil sample has been submitted to the lab for analysis and found to have a total weight of 52 lbs, a total volume of 0.40 ft3, Weight of solids of 46 lbs and a specific gravity of 2.76. What is the void ratio? Prepare a phase diagram as well

Design a rectangular reinforced concrete beam to resist a total design moment Mu=400 ft.kips (this includes the moment due to beam weight). Architectural considerations require that the width (b) be 18 in. and the overall depth (h) be 26 in. Use f′c=4,000 psi and fy=60,000 psi. Sketch your design.

Design a rectangular reinforced concrete beam for a simple span of 35 ft. Uniform service loads are 1.0 kip/ft dead load (excluding the self-weight of the beam) and 1.2 kips/ft live load. Use f′c=4,000 psi and fy=60,000 psi. Sketch your design.

Rainfall data can be presented using different methods. Discuss these methods (advantages and disadvantages) and conclude what is the best method in your opinion?