The columns for a building in central Long Island are to be made of concrete with the
following specifications:
• Design compressive strength: 4500 psi, based on 20 tests of samples having a
standard deviation of 600 psi
• Non-air entrained, and clear space between rebar: 1.5 inch
• Fine aggregate: G = 2.350, FM = 2.5
• Coarse aggregate: G = 2.65, bulk density = 3000 lb/cy

Determine the following:
i. w/c ratio, largest nominal max. coarse aggregate size, % coarse aggregate, % air
(2 pts.)
ii. weight of water, weight of cement, and weight of coarse aggregate to be used per
cubic yard of concrete (1 pt.)
iii. weights and volumes of water, cement, air, coarse aggregate, and fine aggregate
needed to mix a 15-yard batch of this mix (3 pts.)
Also:
• Specify two admixtures that might be used for this mix based on the provided
information, and why to use it. (2 pts.)
• Why we might create a composite of this concrete poured into a PVC (polyvinyl
chloride) sleeve for these columns? (Give specific reasons based on the
characteristics of the individual materials.) (2 pts.)

The columns for a building in central Long Island are to be made of concrete with the following specifications: • Design compressive strength: 4500 psi, based on 20 tests of samples having a standard deviation of 600 psi • Non-air entrained, and clear space between rebar: 1.5 inch • Fine aggregate: G = 2.350, FM = 2.5 • Coarse aggregate: G = 2.65, bulk density = 3000 lb/cy Determine the following: i. w/c ratio, largest nominal max. coarse aggregate size, % coarse aggregate, % air (2 pts.) ii. weight of water, weight of cement, and weight of coarse aggregate to be used per cubic yard of concrete (1 pt.) iii. weights and volumes of water, cement, air, coarse aggregate, and fine aggregate needed to mix a 15-yard batch of this mix (3 pts.) Also: • Specify two admixtures that might be used for this mix based on the provided information, and why to use it. (2 pts.) • Why we might create a composite of this concrete poured into a PVC (polyvinyl chloride) sleeve for these columns? (Give specific reasons based on the characteristics of the individual materials.) (2 pts.)

PROBLEM 5

If the general contractor of a project fails to pay its subcontractors, the subcontractors may file a lien against the owner’s property, and the project owner is required to pay the subcontractors. To avoid the lien against the property and payment to the subcontractors, what measures could the owner do?

Discuss in detail at least five benefits that can result from safe design of drainage pipes and culverts

1. VECTOR PROBLEM: The helicopter travels to accommodate the tourists among the three islands of the Philippines. It moves from the first island going to the second island with a distance of 4.76 km, 37° N of E. It then sails from the second island going to the last island in a direction of 69° W of N. Lastly, the helicopter goes back to the first island pointing in the direction of 28° E of S. Solve for the distance travelled:

(a) from second to third island; and

(b) from the first to third island

If a batch of parts made from a precipitation hardenable alloy have been overaged, they can be salvaged by

1. When the amount that has been earned (BCWP) is consistently below the actual cost to date (ACWP), it can be concluded that the project is under cost.

True

False

QUESTION 2

16.6       The main purpose of an audit of a construction company’s financial statements is to:

QUESTION 3

16.5       From the project lifecycle, we can learn all of the following except:

QUESTION 4

16.3       Which of the following best describes the challenges in managing demobilization?

QUESTION 5

16.1       When the amount that has been earned (BCWP) is consistently below the amount that was supposed to be earned (BCWS), it can be concluded that the project is behind schedule.

True

False

QUESTION 6

16.7      Cost estimating and the resulting data are used for all purposes except:

1. 16.4       Closeout procedures can also benefit the construction manager’s long-term performance in all ways except:

The Environment Bureau of HKSAR Government has recently proposed legislation for the proper management of waste electrical and electronic equipment (Hong Kong WEEE) in Hong Kong, and has consulted public views. Do you think Hong Kong WEEE should copy from the EU WEEE or China WEEE Directives? Justify your answers in 6 bullet points (or short paragraphs).

Give a real world example where a structure collapsed or became structurally unsafe, or settled excessively due to insufficient soil strength.

3. What soil type or types are most prone to frost heave and why? What are the conditions that can lead to frost heave?

Q3: When a mild steel rod was tested under tension, it was observed that a load of 8 kN causes an
extension of 0.024 cm in the rod. The maximum load carried by the steel rod was observed to be
20 kN and the load beyond which stress is not proportional to strain was noted as 10 kN. When the
specimen breaks, the elongation in the rod measured was 5.25 cm and the diameter at the fracture
observed was 0.455 cm. What will be the length and diameter of the steel rod if the total
elongation of the steel rod was found to be 25% and the area of contraction at fracture estimated
was 12%? Based on the test results, determine the values for the stress corresponding to limit of
proportionality, modulus of elasticity of the material and the ultimate stress developed due to
tension.
Experiments were conducted on another brass rod having diameter same as that of the steel rod
and the changes in the dimensions were tabulated. Within elastic limit, the extension of the brass
rod is found to be 35% more than that of the steel rod for a length of 18 cm, suggest a suitable
value for the applied load and determine the percentage increase in the values of stress and the
strain? Given modulus of elasticity of brass is equal to 0.88 times that of the modulus of elasticity
of steel. Compare the properties of steel rod and brass rod based on the test results. (8

What data is needed from each traffic analysis zone to forecast future volumes?

1. population, no. of vehicles, miles of roadway, and no. of buses
2. no. of licensed drivers, no. of vehicles, and no. of households
3. zone boundaries, traffic nodes and centroids, employment
4. forecasted population, no. of jobs, and no. of households

Maximum Service Flow Rate is determined under…

1. ideal weather and pavement conditions
2. ideal driver and vehicle conditions
3. ideal roadway and control conditions
4. ideal vehicle user conditions (no trucks)

3. The watershed shown in the figure below is located in Bowling Green, Kentucky (western Kentucky).  The entire watershed is 100 acres in size and is predominantly forested (woods in good condition) before mining begins.  The soils are Macomber (HSG C) and Saragosa (HSG B) with about 50% of the entire watershed in each. These soil types do not change when mining happens.  One seam of coal is to be surface mined as indicated in the figure below (hatched area), with this strip mine land-use being considered “cultivated land without conservation treatment.”  The remaining non-mined land use remains as forested. Please feel free to treat the mining strip (hatched) area as a rectangle with the width 180 ft and length 4500 ft (18.6 acres).

1. (2.5 points) Calculate the Curve Number for the Before Mining watershed condition

2. (2.5 points) Determine how much of the rainfall falling on this before mining watershed would be removed as initial abstractions.  

3. (2.5 points) Calculate the Curve Number for the After Mining watershed condition.

4. (2.5 points) Determine how much of the rainfall falling on this after mining watershed would be removed as initial abstractions.  

) Consider three monitoring wells, each located at the vertex of an equilateral triangle. The distance between any pair of wells is 200 m. The head at each well, referenced to some common datum, is as follows: well 1, 100.1 m; well 2, 100.2 m; well 3, 100.3 m. Sketch the well field and find the value and direction of the hydraulic gradient.

1. Sketch the well field and find the value and direction of the hydraulic gradient.
2. The aquifer has a hydraulic conductivity of 1000 m/d and a porosity of 0.35. Estimate the travel time for the groundwater to flow between well 1 and well 2.

) Consider three monitoring wells, each located at the vertex of an equilateral triangle. The distance between any pair of wells is 200 m. The head at each well, referenced to some common datum, is as follows: well 1, 100.1 m; well 2, 100.2 m; well 3, 100.3 m. Sketch the well field and find the value and direction of the hydraulic gradient.

1. Sketch the well field and find the value and direction of the hydraulic gradient.
2. The aquifer has a hydraulic conductivity of 1000 m/d and a porosity of 0.35. Estimate the travel time for the groundwater to flow between well 1 and well 2.

Shown below are the results of water quality analyses of a groundwater source. Because all of the constituents were not analyzed, an ion balance may not be achieved. The pH of the water is 7.6.

a. (8 points) Prepare a bar chart of water composition.

b. (6 points) Based on the bar chart, determine the total hardness, carbonate hardness, non-carbonate hardness, and alkalinity (in the unit of mg/L as CaCO₃).

c. (6 points) Estimate the concentrations of carbonate (CO₃^2-) in the water. Express your answer in mmol/L. Given that pK_a1 and pK_a2 of H₂CO₃ are 6.35 and 10.33, respectively.

d. (6 points) Dolomite (CaMg(CO₃)_2(s)) is found in the aquifer sediment where the water sample was collected. Based on the water composition, is dolomite dissolving or precipitating? Given that the Ksp of CaMg(CO₃)_2(s) is 10^-17.09.