Possibility of using fresh concrete waste in concrete for non structural civil engineering works as a waste management strategy

Recycling fresh concrete waste: A review

“…Flexural strength was tested on prisms with 300 mm height and 75 × 75 mm 2 cross section. 55 A polynomial drop from 74.8 to 53.8% of that of the control mixture with natural aggregates was observed when the addition of recycled aggregates increased from 10 to 30%. Zervaki et al 20 found that the effects of slurry granules on mortar were insignificant as the 28-day flexural strength was in the range of 7.0-8.0 MPa.…”

“…For both fine and coarse aggregates, the water absorption of slurry waste particles has a wide range of 4.3–15.8%, which is several times larger than that of the natural aggregates which has a value around 0.9–2.2%. This is attributed to the angular shape of the particles with well‐defined edges and the porous structure mentioned above . To reach the SSD condition, more water is needed for processing the slurry waste particles.…”

“…Rughooputh et al also demonstrated the negative influence of recycled aggregates on the plastic density of fresh concrete when the slump value was 150 ±10 mm. There was a linear drop in the density from 2.44 to 2.26 g/cm 3 with the recycled aggregate contents increased to 30% total natural aggregates.…”

“…Sérifou tested the tensile splitting strength of samples with 100% recycled aggregates, and it was found that the value was reduced by 18% compared to that of the reference mixture with natural aggregates. Flexural strength was tested on prisms with 300 mm height and 75 × 75 mm 2 cross section . A polynomial drop from 74.8 to 53.8% of that of the control mixture with natural aggregates was observed when the addition of recycled aggregates increased from 10 to 30%.…”

“…This is attributed to the angular shape of the particles with well-defined edges and the porous structure mentioned above. [54][55][56] To reach the SSD condition, more water is needed for processing the slurry waste particles. In accordance with relative density and water absorption, the dried powder processes high specific surface area and void volume with an estimation of 310,000 cm 2 /g and 1.2 cm 3 /g.…”