Construction Safety

1. CEO of a residential roofing business: “This fall protection standard is ridiculous. I can’t afford to buy lifelines for all of my employees. Besides, they work faster without lifelines.” OSHA inspector: “The lifelines won’t cost you nearly as much as an injured employee who falls off a roof and breaks his neck.” What is your opinion of OSHA’s fall protection standard? Should residential contractors be exempted?

2. You are a recent college graduate, and this is your first real job. You are the assistant director of safety for Rayster Construction, Inc. (RCI). Your job today is to conduct preoperation inspections of the company’s two cranes that are being used to construct a bridge across a small bay. As you begin your first inspection, the crane operator—who has worked for RCI for 25 years—brushes past you and starts the crane’s engine. He says, “Get out of the way, kid. This crane is just fine. It doesn’t need inspecting. You are holding up my work.” This crane operator has an excellent safety record, as does RCI in general. How should you handle this situation?

A rectangular channel which is laid on a bottom slope of 0.0064 is to carry 20 m3/sec of water . Determine the width of channel when the flow is in critical condition. Take n =0.015

How we can rate the different types of soils for different layers of the pavements on the basis of their CBR values?

How we can determine the ESAL for the design period? Elaborate your answer with a numerical example.

Design size and spacing of dowel bars at an expansion jiont of concerete pavement of thickness 25cm.Given the radius of raltive stifness of 80cm. design wheel load 70kn. load capacity of the dowel system is 50 percent of design wheel load. jiont width is 2.0 cm and the permissible stress in shear, bensing and bearing stress in dowel bars are 1000,1400 and 100kg/cm*2 respectively.

1. Based on the experiment conducted in the laboratory setting, give examples of flow over
weir in real-world application.
2. Describe the measurements of discharge at weirs and its potential errors associated with
indirect methods weir in real-world application setting.
3. Discuss one of the calibration of weirs method.

A beam 3m long is simply supported at its ends. The beam is loaded with a downward vertical load of 200N at a point 2m from the left support.

Using DIM:

a. The maximum deflection is located at what distance from the left support?

b. Calculate the maximum deflection assuming E = 50 GPa and I = 1x10^6 mm4

Design a circular column, using approximate methods, for a factored load of 80 Kips and a
factored moment of 40 Kip-ft. about x and y axes each. The diameter of column is 18".
Material strengths are fc' = 4Ksi and fy = 60Ksi. Use appropriate column interaction diagram.

COURSE: SOIL MECHANICS
-Types of Retaining Walls
1. Gravitational Walls
2. Cantilever Walls
3. Criva Walls
4. Gabion Wall
5. Sheet pile walls
6. Screen walls
7. Armed Earth
8. Walls in Mensula
9. Buttress Walls
-Describe the identified retaining walls
-Identify the importance and application it represents.

Q1: Define creep in concrete? Distinguish it from elastic deformation.

Q2: Discuss the rate of concrete drying shrinkage at different ages.

Q3: Explain the positive aspects of bleeding on concrete.

Q4: Explain the effects of size and grading of aggregates on workability of concrete?

Q5: Differentiate between additives and admixtures with examples.

Q6: Explain the working mechanism of retarders, plasticizers and air entrained
admixtures.

Q7: Define volume and weigh batching of concrete? Explain with examples.

Q8: Differentiate between continuous and batch type concrete mixers?

Q9: Explain, how to improve cohesiveness of concrete ingredients? Indicate its effects on
concrete segregation?

Q10: Discuss the primary reasons for the abnormal setting behaviors of concrete?
Describe how chemical and mineral admixtures may cause concrete abnormal setting with
the help of examples.

1. Do research on the Curriculum Development Centre (CDC) in Malaysia. Find out what the department is about, the function, its roles, and contributions in the curriculum development of Malaysia or your homecountry.

2. Select only ONE education level (pre-school, primary, secondary, tertiary) in Malaysia and explain the Curriculum Development in chronological history until the present day.

3. Write your findings in a 4- pages report (Not inclusive of diagrams or pictures) and include your reflection at the concluding paragraph.

Case Study

N. Got, P.Eng., has been hired recently as the chief engineer, as well as his assistant, James Lo, C.E.T., by a gold mine near a remote town in Northern Ontario. The mining company is the main employer in the region. Immediately upon starting the new job, N. Got spent some time reviewing the mining company’s operational procedures. No Got discovered that, for several years, tailing ponds at the mine have been releasing toxic and corrosive substances into the environment in violation of the law. N. Got also found in the company’s file a recent report prepared by an engineering consulting firm in Toronto. The report concerned an economic feasibility study for updating the mine’s facility. In the report, the engineering consulting firm specifically urged the mining company to undertake a number of expensive capital improvements necessary to ensure compliance with environmental law. N. Got also learned that the mining company could not afford the necessary improvements. N. Got found nothing in the mining company’s files that indicated that any governmental authorities were aware of the illegal discharges.

1. Discuss N. Got’s obligations with respect to the mining company

2. Discuss N. Got’s obligations with respect to the public. What is the public interest in this case? How would the public interest be impacted by N. Got’s actions? How should a potential mine closure and the resultant loss of a large number of jobs affect N. Got’s professional duties?

3. Discuss N. Got’s obligations with respect to the engineering consulting firm.