MINDTAP CONSTRUCTION FOR SPENCE/KULTERM
4th Edition
ISBN: 9781305086319
Author: Kultermann
Publisher: IACCENGAGE
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Question
Chapter 12, Problem 1RQ
To determine
The different ways in which the Concrete Masonry Units are cured.
Expert Solution & Answer
Answer to Problem 1RQ
The curing of Concrete Masonry Units can be done by low pressure kiln or by autoclaving.
Explanation of Solution
The curing of Concrete Masonry Units (CMUs) can be cured by low pressure steam kiln or an autoclaving.
In a low-pressure kiln, the units are placed on a set before the steam is introduced. This is done for one to three hours with a temperature of 22 oC to 38 oC. The steam produced is then induced which provides moisture to the units. The temperature is then gradually raised to 66 oC to 82 oC, depending on the composition of the concrete. This is maintained for a minimum duration of time until the required strength is achieved.
Autoclaving uses a high-pressure steam where the units are placed in the auto clave for a duration of two to five hours and then gradually steam is provided under a pressure of 150 psi for about three hours. Upon the attainment of maximum pressure and temperature, the units are soaked for 5 to 10 hours and the pressure is gradually released.
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Students have asked these similar questions
Question 6:
Chlorine is widely used to purify municipal water supplies and to treat swimming pool
waters. Suppose that the volume of a particular sample of Cl₂ gas is 8.70 L at 895 torr
and 24°C.
(a) How many grams of Cl₂ are in the sample?
⚫ Atomic mass of CI = 35.453 g/mol
• Molar mass of Cl₂ = 2 x 35.453 = 70.906 g/mol
Solution:
Use the Ideal Gas Law:
Step 1: Convert Given Values
• Pressure: P = 895 torr → atm
PV=
= nRT
1
P = 895 ×
= 1.1789 atm
760
•
Temperature: Convert to Kelvin:
T24273.15 = 297.15 K
• Gas constant: R = 0.0821 L atm/mol. K
Volume: V = 8.70 L
Step 2: Solve for n
.
PV
n =
RT
n =
(1.1789)(8.70)
(0.0821)(297.15)
10.25
n =
= 0.420 mol
24.405
Step 3: Calculate Mass of Cl₂
Final Answer: 29.78 g of Cl₂.
mass nx M
mass=
(0.420)(70.906)
mass=
29.78 g
Please solve the highlighted question.
1. Design a PVC sanitary sewer collection system for the Village of Waffle (Figure P-17-24 B, shown below) by
preparing a sewer design table similar to that shown in Example 19-2 and a profile drawing similar
to Figure 19-13b B. You only need to show the calculations for the pipes running along Bacon Road and
Eggs Road, starting at point F and ending at Point B in the figure below. Your design should comply with the
requirements specified in Chapter 30 of the 10 States Standards for Wastewater. Use the following
assumptions:
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Average daily flow rate is the same as average daily water demand, 9.2 m³/hr
Peaking factor for peak dry weather flow is 6.2
Peak wet weather flow is equal to the peak dry weather flow plus an assumption for infiltration and inflow
at 40 L/d-mm-km of pipe
DODO
on Ro
450 m
28 m
D.
150 m
Apartments
D
400 m
D
200 m
B
250 m
0
Dogs Road
ROOD625 m
-120 m
Syrup River
120 m
100-Year flood
Point
Elevation
Tank
137.0 m
A
130.0 m
B
122.0 m
C
122.3 m
D
122.6 m
A
D
300 m…
Chapter 12 Solutions
MINDTAP CONSTRUCTION FOR SPENCE/KULTERM
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