Abstract
The wastewater from ready-mixed concrete plants is currently being recycled as concrete mixing water. It has attracted significant attention from the construction industry and researchers since it promotes sustainable development through environmental protection, energy-saving, and emissions reduction. This article review first introduces the nature of wastewater in ready-mixed concrete plants in different regions. Then the effects of solid content in water on various properties of concrete, including working performance, durability and microscopic properties, are reviewed, respectively, when concrete is mixed with wastewater instead of tap water. Furthermore, the microscopic mechanism of action in concrete mixing with wastewater is discussed, and future work is recommended. This review provides fundamentals on the study of the properties of concrete after wastewater is mixed into concrete.
Highlights
Increasing demand for concrete and the advocacy of environmental protection, energy-saving, and greenhouse emissions reduction through waste concrete recycling has gained significant attention worldwide
Bu et al [1] used recycled aggregate produced from construction waste to prepare recycled aggregate concrete, and Kelechi et al [2] used waste tires ground into crumb rubber (CR) to replace fine aggregate in concrete to prepare self-compacting concrete
When wastewater is used as concrete mixing water, the cement, fly ash, mineral powder, and other particles or wastewater additives will affect the solid content, and pH value of mixing water, affecting the resulting concrete performance
Summary
Increasing demand for concrete and the advocacy of environmental protection, energy-saving, and greenhouse emissions reduction through waste concrete recycling has gained significant attention worldwide. The direct use of wastewater from ready-mix concrete plants in concrete production is an efficient resource utilization method. It can help achieve the goal of zero net pollution and zero net emissions while saving costs, thereby providing tremendous benefits. When wastewater is used as concrete mixing water, the cement, fly ash, mineral powder, and other particles or wastewater additives will affect the solid content, and pH value of mixing water, affecting the resulting concrete performance. Regarding the use of wastewater from the ready-mix concrete plant as concrete mixing water, the concentration and dosage of wastewater are considered the main influencing factors. In this paper, findings on the influence of solid content in wastewater on workability, mechanical properties, durability and microstructure of concrete with different strength grades, have been summarized
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