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2. Guide to Formwork for Concrete
ACI 347R-03
• Chapter 1 – Introduction
• Chapter 2 – Design
• Chapter 3 – Construction
• Chapter 4 – Materials
3. FORMWORK
• ACI 347, Chapter 1, Section 1.2
Formwork – total system of support for freshly placed concrete, including the
mold or sheathing that contacts the concrete and all supporting members,
hardware, and necessary bracing.
• CDOT, Section 601.11
Falsework is defined as any temporary construction used to support vertical
loads for a structure until it becomes self-supporting. Formwork is the
temporary structure or mold used to retain plastic or fluid concrete in its
designated shape until it hardens.
5. Formwork v. Falsework
• ACI - Formwork includes Falsework
• CDOT – Formwork and Falsework are
separate
• Formwork is the “Jello” Mold that holds
fresh concrete
• Falsework supports formwork and other
structures (such as precast girders)
6. Formwork – the “Jello Mold”
There are two types of Formwork:
1. Vertical Forms
2. Horizontal Forms
Vertical Forms are used to hold pressure
Horizontal Forms are used to hold weight
7. Vertical Forms
Vertical Forms are used to form:
Walls
Columns
Piers
Abutments
Beamsides
Other Vertical Concrete Surfaces
18. Pressure
• Vertical Forms are designed to resist
pressure. Form Pressure is affected by:
The Concrete Mix
The Rate of Placement
The Temperature of the Concrete
The Weight of the Concrete
19. Weight
• Horizontal Forms are designed to hold the
weight of the concrete. The design weight
is determined by:
The Depth of the Concrete
The Unit Weight of Concrete
The Amount of Reinforcing
20. Concrete Structures
The Quality of the finished product is
determined by:
Materials
Design
Construction
Placement of the Concrete
24. Success?
Success is measured by how well the Jello
Mold conforms to the owner’s expectations.
Is it the right shape?
Are the length, height and width correct?
Is it within tolerance?
Is it in the right location?
28. Falsework
Falsework is used to support fresh concrete
and the Jello Mold it is in. Falsework is
also used to support other structures such
as precast girders, steel girders, and
existing bridges.
31. Formwork-the “jello”
mold
Wall forms hold pressure.
Deck Forms hold weight.
Falsework holds formwork.
Watch your tolerances.
What are their qualifications?
What are your qualifications?