Self-compacting concrete with recycled concrete aggregate and low shrinkage

New and innovative aspects

The use of construction wastes and by-products from the steel industry gives these concretes an innovative installation process, achieving the same technical characteristics as self-compacting concretes whose composition is based on the use of natural aggregate with additional technical and economic advantages.

Its dosage is shown in Table 1:

Table 1. Composition of mixtures (kg/m3)

Use of waste for the production of sustainable self-compacting concrete optimal for structural use.

Main advantages of its use

• Great flowability and ease of filling formworks of structures with complicated shapes.
• Elimination of the pre-soaking stage in the recycled aggregate.
• Highly self-compactability of concrete. Compaction without vibration.
• Homogeneous finishes without imperfections.
• Economic and sustainable placement by using waste from the precast-concrete industry and by-products from the steel industry known as slag.
• Reduction of energy consumption in its implementation.
• Excellent physical and mechanical properties.

Specifications

The new self-compacting concretes fulfill the international specifications EN 206 and the recommendations of the EFNARC.

Table 2. Properties in fresh state

SF: class of runoff, VS: viscosity in flow, VF; viscosity in the V-funnel test, PA; passsing ability & SR; segregation

Table 3. Properties in hardened state

Applications

• On site application by pouring, pumping or injection.
• Manufacture of concrete pieces with complicated shapes with high aesthetic requirements.
• Foundations and structures.
• Heavily armed structures.
• Construction of large infrastructures such as bridges or tunnels where compaction is complicated.
• Construction with difficult access and high-rise buildings.

Intellectual property status

Protected by patent P202030748

Current development status

Developed, validated and ready to use.

Desired business relationship

Commercial Agreement, License Agreement, Technical Cooperation: further development; Technical Cooperation: testing new applications; Technical Cooperation: adaptation to specific needs.