FUND.OF CONSTRUCTION...-MINDTAP(2 TERM)
4th Edition
ISBN: 9781337552851
Author: Pratt
Publisher: CENGAGE L
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Chapter 11, Problem 9RQ
Calculate the cost per cubic yard to place concrete using each of the alternatives described. The work in both cases consists of placing 140 cubic yards of concrete in footings.
a. Using a crane and bucket at a price of $225 per hour, including an operator, with a crew consisting of 6 laborers, a cement finisher, and a foreman. The concrete will be placed in 7 hours using this setup, and transportation of the crane costs $390.
b. Using a concrete pump at a price of $295 per hour, including an operator and a crew consisting of 5 laborers, a cement finisher, and a foreman. With this setup, concrete is placed in 6 hours and transportation of the pump costs $290.
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Hello and respectCan you tell me the source of these questions from which book or pamphlet thank you
A steel, possessing an eutectoid composition, undergoes a gradual cooling process from 800°C to
600°C. Outline the transformation, equilibrium microstructure, and provide approximate component
proportions.
Describe the resultant non-equilibrium microstructure in two scenarios:
a) the steel is rapidly cooled from 800°C to 600°C within 1 s, and then held at such temperature;
b) the steel is rapidly cooled from 800°C to 600°C within 1 s, maintained at this temperature for
5 s, and subsequently quenched to room temperature.
Use the provided diagrams.
Temperature (°C)
1600
1538°C
1493°C
1400
L
1394°C
Y+L
1200-
1147°C
2.14
Y. Austenite
4.30
1000
912°C
Y+ FeC
800
a
600
400
0
(Fe)
0.76
0.022
a, Ferrite
2
a + Fe3C
3
Composition (wt% C)
727°C
Cementite (Fe3C)
4
5
6
6.7
Please show the complete solution. The answers in this problem must be:
1. 16.25 kN
2. 51.725 kN
3. 45 000 mm²
4. 52.086 kN
5. 165.776 MPa
6. 62. 572 kN
7. 199. 173 MPa
8. 68.579 kN
Chapter 11 Solutions
FUND.OF CONSTRUCTION...-MINDTAP(2 TERM)
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