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Valorization of recycled materials in development of self-compacting concrete: Mixing recycled concrete aggregates – Windshield waste glass aggregates
Highlights Recycled concrete and recycled glass were used for producing self-compacting concrete. Using in SCC of fine and coarse aggregates recycled is not advisable, the EFNARC criteria will not be satisfied. Replacing RCA volume by RGA did not affect the flowability. Compressive strength decreased with recycled glass content increase. Windshield waste glass aggregate can successfully be used for producing (SCC).
Abstract The presented paper is based on a comparative experimental study aimed to incorporate coarse recycled concrete aggregates (RCA) and coarse recycled glass aggregates (RGA) from waste glass “windshield” in the composition of self-compacting concrete (SCC). The main objective is to study the influence of these aggregates on fresh and hardened concrete properties. In order to reach this purpose, two series of SCC mixes were prepared by replacing natural coarse aggregates (NCA) by RCA and RCA by RGA. The key properties of SCC recommended by European specifications and guidelines (EFNARC), were measured in the fresh state. While the compressive strength, water absorption testing and the observations on cross-section to evaluate the stability and segregation potential, were conducted on hardened concretes. For replacement of NCA by RCA, the use in SCC fine and coarse recycled concrete aggregates is not advisable, the flowability criteria cannot be ensured. The experimental results showed that the slump flow test has given a diameter of 610 mm. Likewise, also the L-box blocking ratio was limited to 0.2. The replacement of RCA by RGA did not significantly affect the initial slump, the obtained values are all above the minimum threshold of 650 mm. EFNARC criterion of passing ability is also satisfied. The yield stress and the plastic viscosity, determined by empirical equations, are in agreement with those observed with traditional SCC. The compressive strength of the RGA–SCC mixes decreased with an increase in recycled glass content but remain within the strength range of self-compacting concretes. The results have showed that it is possible to produce SCC with windshield waste glass aggregates.
Valorization of recycled materials in development of self-compacting concrete: Mixing recycled concrete aggregates – Windshield waste glass aggregates
Highlights Recycled concrete and recycled glass were used for producing self-compacting concrete. Using in SCC of fine and coarse aggregates recycled is not advisable, the EFNARC criteria will not be satisfied. Replacing RCA volume by RGA did not affect the flowability. Compressive strength decreased with recycled glass content increase. Windshield waste glass aggregate can successfully be used for producing (SCC).
Abstract The presented paper is based on a comparative experimental study aimed to incorporate coarse recycled concrete aggregates (RCA) and coarse recycled glass aggregates (RGA) from waste glass “windshield” in the composition of self-compacting concrete (SCC). The main objective is to study the influence of these aggregates on fresh and hardened concrete properties. In order to reach this purpose, two series of SCC mixes were prepared by replacing natural coarse aggregates (NCA) by RCA and RCA by RGA. The key properties of SCC recommended by European specifications and guidelines (EFNARC), were measured in the fresh state. While the compressive strength, water absorption testing and the observations on cross-section to evaluate the stability and segregation potential, were conducted on hardened concretes. For replacement of NCA by RCA, the use in SCC fine and coarse recycled concrete aggregates is not advisable, the flowability criteria cannot be ensured. The experimental results showed that the slump flow test has given a diameter of 610 mm. Likewise, also the L-box blocking ratio was limited to 0.2. The replacement of RCA by RGA did not significantly affect the initial slump, the obtained values are all above the minimum threshold of 650 mm. EFNARC criterion of passing ability is also satisfied. The yield stress and the plastic viscosity, determined by empirical equations, are in agreement with those observed with traditional SCC. The compressive strength of the RGA–SCC mixes decreased with an increase in recycled glass content but remain within the strength range of self-compacting concretes. The results have showed that it is possible to produce SCC with windshield waste glass aggregates.
Valorization of recycled materials in development of self-compacting concrete: Mixing recycled concrete aggregates – Windshield waste glass aggregates
Arabi, Nourredine (author) / Meftah, Houria (author) / Amara, Hanane (author) / Kebaïli, Oussama (author) / Berredjem, Layachi (author)
Construction and Building Materials ; 209 ; 364-376
2019-03-04
13 pages
Article (Journal)
Electronic Resource
English
RCA , Recycled concrete aggregates , FRCA , Fine recycled concrete aggregates , RGA , Recycled glass aggregates , NCA , Natural coarse aggregates , SCC , Self compacting concrete , RCA-SCC , Self compacting concrete mix prepared with recycled concrete aggregates , RGA-SCC , Self compacting concrete mix prepared with recycled glass aggregates , EFNARC , Specification and Guidelines for Self-compacting Concrete , PVB , Polyvinyl butyral , ASR , Alkali-silica reaction , <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><msubsup><mi>τ</mi> <mn>0</mn> <mo>′</mo></msubsup></mrow></math> , Yield stress (in Pa) , <italic>μ</italic> , Plastic viscosity (in Pa.s) , <italic>sf</italic> , Slump-flow in mm , <italic>ρ</italic> , Fresh density of SCC in Kg/m<sup>3</sup> , Windshield waste glass aggregates , Self-compacting concrete , Flowability , Compressive strength
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