Available Capital (Cost)

The cost of concrete formwork is influenced by three factors:

1. Подпись: Copyright © Marcel Dekker, Inc. All rights reserved.Initial cost or fabrication cost, which includes the cost of transportation, materials, assembly, and erection.

2. Potential reuse, which decreases the final total cost per square foot (or per square meter) of contact area. The data in Table 5.1 indicates that the maximum economy can be achieved by maximizing the number of reuses.

3. Stripping cost, which also includes the cost of cleaning and repair. This item tends to remain constant for each reuse up to a certain point, at which the total cost of re­pairing and cleaning start rising rapidly.

Number of uses

Cost per square foot of contact area

Cost per square meter of contact area

One

1.00

10.76

Two

0.62

6.67

Three

0.5

5.38

Four

0.44

4.74

Five

0.4

4.31

Six

0.37

3.98

Seven

0.36

3.88

Eight

0.35

3.77

Nine

0.33

3.55

Ten

0.32

3.44

Table 5.1 Effect of Reuse on Concrete Formwork Cost Based on One Use Equal to 1.00

In deciding to use a specific formwork system, the initial cost should be evaluated versus the available capital allocated for form­work cost. Some formwork systems tend to have a high initial cost, but through repetitive reuse, they become economical. For exam­ple, slipforms have a high initial cost, but the average potential reuse (usually over 100) reduces the final cost per square foot (or per square meter) of contact area of this alternative. In the case of rented formwork systems, the period of time in which the form­work is in use has a great effect on the cost of formwork.