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

A square round column is to be designed with DL = 600 KN, LL = 800 KN, fc’ = 20.7 MPa, fy = 345 MPa. Use ?? = 0.02, 25 ?? ∅ ???? ????, ??? 10 ?? ∅ ????.

USE 1.2 DL + 1.6 LL

A cantilever retaining wall has been backfilled with a borrow soil which has a unit weigth ϒ= 18 kN/m3 and a friction angle Θ = 30°.

Assuming that the other following input parameters are provided:
Friction coefficient μ = 0.35; Maximum bearing capacity = 500 kPa.
RCD4701/101/0/2020

13
Live Load w = 5 kN/m2; Point Load = 100 kN.
Fcu = 25 MPa; Fy = 450 MPa.
Check the stability of the wall and provide the reinforcement for the retaining structure

WRITE COMPLETE SOLUTION.

4. The growth rate of a certain colony of bacteria in a controlled room temperature is given by the expression

dP(t)/dt = -4.375x10^-5 P(t)^2 + 0.0525P(t)

Where:
P(t) = bacterial count
t      = time

Initial biomass count was performed by the researchers and found a total of 400 grams.
Determine:
a) The time when population reaches 500 grams.
b) The time when population reaches 850 grams.
c) The time when half of the maximum growth rate is reached.