Mechanistically, what is the difference between Nabarro-Herring and Coble creep

A rigid pavement is to be designed to provide a service life of 20 years and has an initial PSI of 4.4 and a TSI of 2.5. The modulus of subgrade reaction is determined to be 300 lb/in3. For design, the daily car, pickup truck, and light van traffic is 30,000; and the daily truck traffic consists of 300 passes of single-unit trucks with single and tandem axles, and 400 passes of tractor semi-trailer trucks with single, tandem, and triple axles. The weights for cars, pickups, light vans is two -2000 lb single axles, for single unit trucks are 10,000 lb steering, single axle and 22,000 lb drive, tandem axle and for tractor semi-trailer trucksare 12000 lb steering, single axle, 18,000-lb drive, tandem axle and 50,000 lb, trailer, triple axle.Reliability is 95%, the overall standard deviation is 0.45, the concrete modulus of elasticity is 4.5 million ln/in2, the concrete’s modulus of rupture is 900 lb/in2, the load transfer coefficient is 3.2, the drainage coefficient is 1.0. Determine the required slab thickness.

1. What types of economic process applicate for firing process in tile and brick ?

4. A 1000 litrecontainmenttankcatches the outflowfrom a processing apparatus whichhas 800 litresof water with2 gof chemical agentdissolved in it.  Additional supplycomesinto the tank at 3 litres/hr containing5 g/litreof the chemical agent. The solution leaves thecontainmenttank at 3 litres/hr. When the amount of chemical agentin the containment tankreaches 500 g, no more supplyis allowed to enter the system. Instead,fresh water is input intothe tank at 2 litres/hr; andat the same time,the outflow is increased to 4 litres/hr.  How much chemical agentis heldin thecontainmenttankat any time t.Assume all liquids are well-mixed.(10marks

Calculate the field weights of the ingredients for 0.039 m3 of concrete by using ACI Method of Mix Design. Job specifications dictate the followings:  

Cement content: 300 kg/m3

w/c: 0.57 (by weight, from the strength point of view)

w/c: 0.53 (by weight, from durability point of view)

Fine Aggregate (SSD)/Coarse Aggregate (SSD)=0.45 (by weight)

Air Content: 1,30 %  

For Fine Aggregate (Crushed): SSD Bulk Specific Gravity: 2.47, Total Moisture: 5,0 % and Absorption Aggregate: 2,7 %.  

For Coarse Aggregate (Crushed): SSD Bulk Specific Gravity: 2.60, Absorption Capacity: 2.0 %, Total Moisture: 1.9 % and Dry Rodded Unit Weight: 1470 kg/m3.

Cement: Sulphate Resisting Cement, Specific Gravity: 3.17

FIBER REINFORCED CONCRETE

Explain the use of the following fibers:

a) Steel

b) Glass

c) Natural

d) Polymer

e) Asbestos

f) Carbon

A 276 m equal-tangent sag vertical curve has the PVC at station 3 + 700.000 and elevation 321 m. The initial grade is -3.5% and the final grade is +0.5%. Determine the stationing and elevation of the PVI, the PVT, and the lowest point on the curve.

Write four general principles to be observed while laying damp proof course.

A machine follow Carnot which is working between the temperatures TL = 45.9 0
C and
TH = 698.7 0
C. The engine performs 1423 J of work each cycle which takes 0.32 sec.
a. What is the efficiency of this machine?
b. What is the average power of this machine?
c. How much heat is extracted from the high-T reservoir each cycle?
d. Explain the loss of power and how to optimize it?

A residential building was affected by the patches on all the walls, leakages in the corner of the building and uneven floors. Explain briefly the four methods to control the above problem mention in the building.

Yield strength and modulus of elasticity of steel containing 0.4% carbon had been determined as 300 MPa and 230 GPa, respectively. Estimate the yield strength and modulus of elasticity of the steel for a carbon content of 1.1% and explain the way of your estimation.

A water treatment plant has three identical horizontal shaft flocculation tanks. Each tank is composed of three stages with size of 4 m depth, 14.1 m length and 15 m width. G value of each stage is 40 s-1, 30 s-1 and 20 s-1. Mean water temperature is 15°C (μ = 1.139×10-3). What are the power requirements for flocculation stages in a single flocculation tank. And Is the flocculation tank in an efficient way?

( Plant's average flow rate of 300,000 m3/d, Design criteria: G · t 104 ~ 105, Detention time 20~30 min )

Calculate the followings regarding to lime and gypsum production:

a) How much pure limestone is necessary to obtain 2 tons of slaked lime?

b) How much pure gypsum rock is necessary to obtain 2 ton of plaster of Paris.

Molar atomic masses - Ca: 40 g, O:16 g, C:12 g, H: 1 g, S:32 g