Self-compacting concrete with recycled concrete aggregate and low shrinkage is characterized by its composition based on Portland cement as first binder, ground granulated blast furnace slag as second binder, and ladle furnace slag as third binder. Its innovative composition and installation procedure allow achieving excellent durability, sustainability and aesthetic results.
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:
Material/L | L0 | L5 | L10 |
CEM I 52.5 R | 210 | 190 | 170 |
Ladle furnace slag | 0 | 20 | 40 |
Ground granuatled blast furnace slag | 210 | ||
Recycled concrete aggregate (< 0.50 mm) | 305 | ||
Water | 335 | ||
Coarse recycled concrete aggregate | 405 | ||
Fine recycled concrete aggregate | 865 | ||
Viscosity regulator | 2,3 | ||
Plasticizer | 4,5 |
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
Specifications
The new self-compacting concretes fulfill the international specifications EN 206 and the recommendations of the EFNARC.
Property | Time since kneading (min) | L0 | L5 | L10 |
Slump flow (mm) | 0 | 830 (SF3) | 825 (SF3) | 810 (SF3) |
15 | 780 (SF3) | 770 (SF3) | 755 (SF3) | |
30 | 705 (SF2) | 700 (SF2) | 675 (SF2) | |
60 | 555 (SF1) | 550 (SF1) | 550 (SF1) | |
T500 (s) | 0 | 3,6 (VS2) | 4,0 (VS2) | 4,4 (VS2) |
15 | 5,8 (VS2) | 6,0 (VS2) | 6,6 (VS2) | |
30 | 8,4 (VS2) | 9,0 (VS2) | 9,8 (VS2) | |
60 | 12,8 (VS2) | 13,8 (VS2) | 15,2 (VS2) | |
Empting time V-funnel test (s) | 15 | 24,8 (VF2) | 25,6 (VF2) | 26,2 (VF2) |
Blocking ratio, L-box test | 15 | 0,86 (PA1) | 0,85 (PA1) | 0,82 (PA1) |
Resistance to segregation (%) | 30 | 1,31 (SR2) | 1,26 (SR2) | 1,19 (SR2) |
Fresh density (Mg/m3) | - | 1,96 | 1,97 | 2,01 |
Occluded air (%) | - | 5,9 | 5,7 | 5,4 |
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
Age (days) | L0 | L5 | L10 | |
Compressive strength on cubic specimen (MPa) | 7 | 22,3 | 21,8 | 20,5 |
28 | 31,8 | 32,6 | 34,5 | |
Hardened Density (Mg/m3) | 28 | 1,81 | 1,86 | 1,89 |
Modulus of elasticity (GPa) | 7 | 13,9 | 13,4 | 13,3 |
28 | 16,1 | 16,3 | 16,8 | |
Setting shrinkage (mm/m) | 2 | 0,65 | 0,51 | 0,63 |
Long-term shrinkage (mm/m) | 180 | 1,30 | 1,08 | 0,83 |
Table 3. Properties in hardened state
Applications
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.
The aim of the The Technology Transfer Office (TTO) of the Univesidad de Burgos is to promote Innovation technology through the reseach results transfer and the conexions between the University and the new needs and requirements of the society - we are the link between the University and the Industry. Contact person: José Manuel López (jmllopez@ubu.es)
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