Fundamentals Of Construction Estimating
4th Edition
ISBN: 9781337399395
Author: Pratt, David J.
Publisher: Cengage,
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Textbook Question
Chapter 5, Problem 1RQ
Why is it recommended that the estimator begin a takeoff of concrete work by measuring the quantity of concrete in an item rather than the amount of formwork?
Expert Solution & Answer
To determine
The reason recommended for the estimator to begin a takeoff of concrete work by measuring the quantity of concrete in an item rather than the formwork amount.
Explanation of Solution
Taking off concrete work must start with the estimator measuring the concrete as the actual concrete descriptions are usually given on the drawings, whereas the details of the formwork are not given. The estimator can then review the needs for the formwork by measuring and estimating the volume of concrete needed followed by the requirements of finishing.
Since only the area of forms in contact with the concrete is measured, at the time of the takeoff, the estimator does not have to review the descriptions of the forms design.
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Homework:
Determine the proportions of the separate aggregates that will give a gradation within the SCRB
wearing coarse specified limits for the aggregates and mix composition for highway pavement
asphaltic concrete. The table below shows the results of sieve analysis of samples from the
materials available.
برو
Percent by Weight
Passing Sieve
Designation
Retained
on Sieve
Designation
Coarse
Aggregate
Fine
Aggregate
Mineral
Filler
3/4 in. (19 mm)
1/2 in.
5
½ in. (12.5 mm)
3/8 in.
35
¾ in. (9.5 mm)
No. 4
38
No. 4 (4.75 mm)
No. 10
17
No. 10 (2 mm)
No. 40
5
No. 40 (0.425 mm)
No. 80
No. 80 (0.180 mm)
No. 200
No. 200 (0.075 mm)
Total
18
1118
30
35
5
26
35
60
100
100
100
For the driven pile shown in figure, estimate the
allowable capacity by:
(a) Tomlinson a-method,
(b)Vijayvergia and Focht A-method.
Which one of the two methods are more conservative?
Qall =?
W.T
18.21 kN/m²
930
L=18m
Square pile
27.5cm x 27.5cm
Chapter 5 Solutions
Fundamentals Of Construction Estimating
Ch. 5 - Why is it recommended that the estimator begin a...Ch. 5 - Why is it also preferable to measure the concrete...Ch. 5 - Why is nothing added to the concrete quantities...Ch. 5 - What size does an opening in concrete have to be...Ch. 5 - Why is concrete classified and measured separately...Ch. 5 - Prob. 6RQ
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