A Study on the Practical Recycling of Ready Mixed Concrete Sludge Water to Concrete

Recycling fresh concrete waste: A review

“…The lowest value detected was 97% of that of the reference sample. Moon et al gained a similar conclusion by testing the compressive strength of the mortar with different proportion of wastewater at 3, 7, and 28 days. At an early age, mortar with more wastewater was superior to the mortar with fresh water in terms of compressive strength.…”

“…Wastewater substitution for less than 40% of tap water still enabled the concrete to maintain the recommended value in the standard. Moon et al also observed an improvement in the compressive strength of concrete with further replacement from 50 to 100%. At 28 days, the compressive strength of the concrete with 100% wastewater was over 10% higher than that of the concrete with fresh water.…”

“…The compressive strength of the concrete with different proportions of slurry granules at 7 and 28 days were quite similar to that of the normal concrete, in a range of 28.7–31.6 and 33.4–35.9 MPa, respectively. Moon et al tested the compressive strength of concrete using 0–6% recycled fine aggregates substitution and gained a considerable result. Recycled aggregates slightly improved the compressive strength of concrete at all curing days.…”

Preparation and Properties of Sustainable Concrete Using Activated Sludge of Industrial By-Products

“…In ready-mixed concrete production, the generation of recycled water is inevitable and needs attention for its efficient use [8]. In Europe and the USA, it is prohibited to discharge recycled water if its pH is lower than 11.5 [9,10].…”

“…Lee et al utilized less than 4% sludge of ready-mixed concrete and produced durable concrete [17]. Han et al used different amounts of recycled water with different compositions to make durable concrete [18,19]. They recommended the use of either recycled water of ready-mixed concrete or chemical admixtures to prepare concrete.…”