SCC: reducing production costs with nonlinear models

Concrete recipes are usually prepared by trial-and-error experiments. This work shows how systematic experimentation ­followed by the development of nonlinear models resulted in significantly better recipes that were also more cost-efficient.

Self-compacting concrete (SCC) is a material with special rheological characteristics. It has a low yield stress and a moderate plastic viscosity, which is just sufficient for it to flow under its own weight without segregation or bleeding. These concretes are used where compaction is not feasible. For example, large building elements are often cast with self-compacting concrete. This concrete tends to be somewhat more expensive, which makes its mix proportioning an important issue.

The concrete has to have the right rheological characteristics, early strength and 28-day strength. Furthermore,...

Related articles:

Issue 08/2020

Replacing natural sand by crushed rock in concrete using nonlinear modelling

There is a lot of pressure to stop using natural sand and instead use crushed rock or recycled aggregate in concretes. However, crushed rock tends to have sharp corners, which affect not only the...

Issue 09/2009 Powder-type SCC with crushed mineral aggregates

Design concept and flow properties of SCC – Part 2

Powder-type SCC mix design To produce the SCCs under study, the above-described aggregate mixes consisting of gravel and fluvial sand (K-F), quartz porphyry chippings and fluvial sand (Q-F), shell...

Issue 02/2015 New findings and calculation methods

Creeping and shrinking of ultra-high performance concrete (UHPC)

Due to their high strength and durability, ultra-high performance concretes allow realizing particularly exposed building structures. The fact that despite its dense microstructure UHPC is subject...

Issue 07/2022

Compacting concrete – The state of the art of laboratory vibrating table technology

1 Theoretical principles of concrete compaction The fresh concrete to be produced is composed of cement, aggregate of different particle sizes, mostly between 0.25 to 32 mm, and mixing water. Today,...

Issue 03/2015

Numerical modelling of SCC flow through ­reinforced sections­

In the last decades, numerical simulations of fresh concrete flow have gained increasing importance in the concrete industry [1, 2]. They showed a potential to become an essential tool for better...