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Spanish university offers licenses for self-compacting concrete with recycled concrete sand and gravel with slow retraction for sustainable structures

Country of Origin: Spain
Reference Number: TOES20210322001
Publication Date: 22 March 2021

Summary

Researchers from a Spanish university have developed two self-compacting concrete with recycled concrete sand and gravel, one with low retraction, characterised by its composition bases on Portland cement as the first binder, ground granulated iron and steel slag as the second binder, and white ladle furnace slag as the third binder. Its composition achieves excellent durability, sustainability and aesthetic results. They seek license agreements for further development, testing and adaptation.

Description

The Spanish research group has a wide experience in structural health monitoring and instrumentation of civil engineering structures and belongs to a medium-sized Spanish university founded in 1994, housing others 76 research groups more. The university has been very active in several European research and innovation programmes (H2020 and previous FPs, LIFE, Justice, ERASMUS+, Interreg, COST, LLP, IEE, Research Fund for Coal and Steel, D. G. for Competition Policy and Strategy, Science for Peace and Security Programme-OTAN…) with over 50 European projects; with the role of coordinator in 22 projects and over 8.4 M€ overall EU funding received. Currently, this university participates in 26 on-going projects (in 12 of them as coordinator) in 8 different EU programmes with an average of 1.7 M€ of EU funding in the last 4 years.

The use of construction waste and waste from the steel industry in concretes enables an innovative installation process, achieving the same technical characteristics as self-compacting concretes whose composition is based on the use of fractions with natural sand and gravel with additional technical and economic advantages.

Self-compacting concrete with recycled concrete sand and gravel dosage is shown in Table 1
Note: all three mixtures are suitable for use, although the MIX50 mix provides an adequate balance between material performance and product sustainability.

Self-compacting concrete with recycled concrete sand and gravel concrete and slow retraction dosage is shown in Table 2

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

The potential applications of the innovative installation process are as follow:
- Application on site 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.

The type of association sought by the researcher group is license agreement with companies from the construction sector. Additionally, further development, testing new applications and/or adaptation to specific needs are offered to the potential partner.
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Advantages and Innovations

The new mixtures show the following advantages in terms of mechanical performance and in the installation process:
• Great fluidity and ease of filling molds for structures with complicated shapes.
• Elimination of the presaturation stage in the recycled sand and gravel used.
• High self-compactability of concrete. Compaction without the need for vibrating.
• Homogeneous finishes without imperfections.
• Economical and sustainable to implement 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.

Stage Of Development

Under development/lab tested

Requested partner

License agreement
- Type: private companies or municipalities.
- Activity: construction industries, civil or not, and other industries.
- Role: high performance structural concrete, search for other needs.

Kooperationsanfrage stellen