Concrete for Precast Structures

Concrete for Precast Structures

Precast concrete is used to form structures which are delivered after hardening. Long journeys in the fresh concrete state disappear, which changes the whole production sequence. Concrete used for the production of precast structures requires an industrialized production process,and a good concrete mix design with continuous optimization is essential. The following points are important through the different stages of the process:

Preparation of concrete design

When preparing the design, the concrete requirements must be defined according to the specific elements, their intended use and exposure conditions. The following parameters should normally be defined:

·     Strength requirements

·     Durability requirements

·     Aesthetic requirements

·     Maximum particle diameter

·     Method of placement

·     Placing rate

·     Concrete consistence

·     General boundary conditions (temperature etc.)

·     Handling of the concrete and its placing

·     Definition of test requirements

·     Consideration of the specific concrete element parameters

·     Curing definition

·     Mix design and specification

·     Preliminary testing

·     Mix design adjustment if necessary