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2 Journal of Ecological Engineering

2 2023

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Reducing the Reactive Powder Concrete Weight by Using Building Waste as Replacement of Cement

Abbas Zena K., Al-Baghdadi Hayder A., Mahmood Raghad Sameer, Abd Estabraq Shawqi

Journal of Ecological Engineering

2023

Vol. 24, nr 8

25--32

The ability of reducing the high weight of reactive powder concrete (RPC) by decreasing the cement content using waste demolished building material to produce the eco-friendly sustainable RPC was the main goal of the experimental lab investigation. The collecting, crushing and grinding to high fineness powder waste of clay brick, window glass and terrazzo tile constituted the best way to dispose without the need for a waste sanitary landfill. Nine RPC mixtures with 5, 10 and 15% partial replacement of cement weight in addition to control mix were prepared to investigate the strength. The slight enhancement strength of the RPC containing 5% of very fine powder clay brick or window glass or terrazzo tile as cement weight replacement cement up to (4.9, 4.2, 4.5)% – brick, (2, 1.8, 1.6)% – glass and (1.5, 0.5, 0.8)% – tile for (compressive – flexural – tensile), respectively, at 28 days compared to the control mix. The percentage of 10% still yielded acceptable strength results, while 15% presented the starting of reduction of (compressive – flexural – tensile) strength.

Investigation of the Ability of Producing Eco-Friendly Roller Compacted Concrete Using Waste Material

Tarrad Abdullah T., Abbas Zena K.

Journal of Ecological Engineering

2023

Vol. 24, nr 10

277--289

The major objective of the experimental lab investigation was to produce eco-friendly sustainable roller compacted concrete (RCC) by reducing cement content once using demolition waste material. The best method of disposing of waste demolition without needing for a sanitary landfill was by accumulating, crushing and then blending to a high fineness powder, followed by using it in materials such as clay bricks, marble tiles, and glass windows. Six RCC mixtures with partial cement weight replacements of 5%, and 10% were made in addition to the reference mixture. To investigate the strength (compressive, flexural and tensile splitting strength), porosity, water absorption, and density were all tested after the production of mixtures. The results of the study indicate that the RCC containing 10% of clay bricks powder enhances the strength of RCC up to 14.78%, 17.96%, and 12.87% for compressive, tensile, flexural, respectively, at 28-days of curing compared to the reference mixture, followed by the mixture containing 10% of marble tiles powder with percentage increase up to 7.12%, 14.44%, and 7.02%. While the glass windows with 5% can be adopted, the results close to reference mixture with slight improvement equal to 0.68%, 2.11%, and 3.22%, and slight reduction when using 10% replacement of cement weight, were obtained.