Explain Mohr’s circle method to find normal and tangential stress on an oblique plane

You have been asked by a colleague what the latest innovations in construction material are. Prepare a response on what you consider to be the most innovative materials currently being used or considered for use in the construction industry.

1. A car washing and lubricating company has been operating for more than 10 years in a terrain with the following characteristics: porous, filterable with a freatic level near to the surface (5 m depth). This area is close to the estuary which is very useful to them since all the disposals and waste generated by this activity are directly released into the estuary. These disposals contain a high level of oils and greases. All the dumping from the car maintenance goes directly into the soil since there are no palettes or gutters. The operation hours are 20 hours for seven days a week. On the complaint of the locals, the Municipal Council has arranged the execution of an Environmental Impact Assessment (EIA) and you are part of it. What type of environmental evaluation must be performed by the Municipality according to this case?

a) What type of environmental evaluation must be performed by the Municipality according to this case?

b) What type of proposed professionals that will be part of the consultancy group performing the EIA?

c) List three environmental effects of this activity.

d) Mention three mitigation measures you will propose as part of your Environmental Management Plan (EMP) to mitigate the impacts identified.

- Calculate the atomic packing factor for Face Centered cubic and Body Centered Cubic crystal structures

How has sustainable construction materials changed the construction industry?

1) Design forms for 13’-8” high wall to be concreted at the rate of 5 ft per hour, internally vibrated. Assume the mix is made with Type I cement, with no pozzolans or admixtures, and that the temperature of concrete at placing is 75°F. The unit weight of concrete is 150 pcf with a slump of 3.75 inches. The forms will be used only once, so short-term loading stresses will apply. Use form grade plywood sheathing 7/8 in. thick in 5×10-ft sheets, and 5,250-lb coil ties are on hand. Framing lumber of No. 2 Douglas Fir-Larch is to be purchased as required.

Design for SHEATHING and STUD SIZE.                                                                  

Should I use the maximum value for the bending moment in the negative area for compression stress and maximum bending moment in the positive are for tension stress?

Do a quick calculation of the thermal conductance (U value) across a cavity wall consisting of:

1. Outer skin 110mm brickwork (South facing, exposed aspect)

2. 30mm cavity

3. Inner skin of 10mm plasterboard

(Hint: R value and U-values are required)

Between 4:00PM and 6:00PM the vehicles arrive to the entrance ramp of a regional toll road at a constant rate of 1740 vehicles per hour. The toll plaza at the entrance ramp has five toll booths, which combined can process up to 34 vehicles per minute. At 4:30PM one of the toll booths is disabled due to electronics malfunction, which reduces the vehicle processing capacity of the toll plaza to 27 vehicles per minute. At 5:00 PM the toll booth is repaired and the toll plaza capacity is restored back to 34 vehicles per minute. Assuming that the vehicle arrivals and departures at the toll plaza have uniform deterministic distributions, determine the total duration of the queue that had formed due to the toll booth closure, in minutes.