Environmental challenges

The supply of sand and aggregates is becoming a major challenge in the face of dwindling resources and new types of available aggregates.

Every year, 15 to 20 billion tonnes of sand are used by the construction industry*. While this figure is impressive, it becomes even more so when we compare it to the sands that can be exploited by this industry.

Indeed, the majority of the so-called “complex” aggregates (deserts, local quarries, seabeds, etc.) available on our planet are [in retrospect] not exploitable for the manufacture of concrete, leading to various problems – high presence of clays, excess of fines, too slick, poor bonding with cements – thus restricting the quantity available of this precious resource.

* Source: Isabelle Cojan and Nor-Edine Abriak,
https://imtech.imt.fr/2019/03/27/sable-ressource-rare-remplacer/ 

Complex Aggregates: Impacts on Concrete Performance and Placement

Lack of fines
Compactness – Porosity
Rheology – Penetration, pumpability issues

Excess of fines
Water demand / admixture
Rheology – pumpability and workability
Productivity – Mixing time

Sand shapes
Water demand / Admixture
Rheology – pumpability and workability
Maintaining workability
Productivity – Mixing time

Swelling clays
Water demand / Admixture
Rheology – pumpability and workability
Maintaining workability
Productivity – Mixing time

CHRYSO®Quad solution

Promoting the circular economy: a shift in aggregate supply

The use of a wide range of sands, with the integration of complex sands, allows to optimise local resources, to reduce supply costs and to decrease the carbon footprint.

With the CHRYSO®Quad solution, CHRYSO extends the field of use of complex aggregates in concrete formulations. It becomes possible to use locally sourced aggregates and/or aggregates from deconstruction sites, while maintaining the technical performance of concrete.

 

 

 

 

The implementation of a circular economy approach with the use of local aggregates or aggregates from deconstruction sites is a major challenge to accelerate sustainable construction.

The CHRYSO®Quad range and dedicated services allow to optimise production costs and to improve the quality and performance of concrete using complex aggregates.

Related services

CHRYSO®Quad Lab is an advanced aggregate diagnostic tool, developed to analyse your sands and select the CHRYSO®Quad admixture best suited to your needs. To go even further in the selection of your local aggregates, CHRYSO offers you a set of services that can be carried out in the field:

Analysis of your sands

Analysis of your sands

Thanks to CHRYSO®Clear Test, a unique, patented tool developed by CHRYSO, we are able to quickly reveal the presence of swelling clays in sands.

The test can be performed directly in the field or in the laboratory. It offers an immediate and targeted result.

Quad App
CHRYSO®Quad App

CHRYSO®Quad App

CHRYSO has developed CHRYSO®Quad Lab App, a new application that allows you to analyse new sources of supply close to your concrete production site, and to identify the most suitable admixture solution.

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