Abstract
The production of high-quality recycled aggregate from waste concrete provides a by-product in the form of a powder. It has been separated from the surface of the aggregate during a grinding process. The properties of the powder and its application as a material in the manufacture of concrete were investigated in this study. It is expected that this powder waste can be used sustainability in concrete manufacturing. The testing procedure included an investigating of the chemical, physical, and mechanical properties of the concrete waste powder. Furthermore, the powder was used both as a substitute for Portland cement by 25% and 50% and as an addition of Portland cement by 5%. The initial setting time, final setting time, and the consistency of the recycled waste concrete powder are greater than that of Portland cement. The increase also occurs in the chemical content of iron oxide. Furthermore, concrete with a substitution of 25% and 50% of waste concrete powder shows a decrease in compressive strength of 23.54% and 42.84%, respectively, compared to the normal compressive strength. Meanwhile, the addition of concrete waste powder to concrete with an addition of 5% reaches an increase in compressive strength of 22.98%. The use of waste concrete powder is recommended as an additional material because it can perform as filler; consequently, it produces denser concrete.
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