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Dr. Muge Mukaddes Darwish
Civil, Environmental, Construction Engineering Department, Edward E. Whitacre Jr. College Of Engineering, Texas Tech University, 2500 Broadway, Lubbock, TX 79409-1042, USA

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Research Keywords & Expertise

0 Risk Management
0 Construction safety and health
0 Engineering education development techniques
0 Increasing achievements of underrepresented groups in science
0 Sustainable and resilience urban development

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Journal article
Published: 12 December 2019 in Sustainability
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Wherever there are construction activities, there is waste generation. In Ethiopia, the popular material for wall construction is a hollow concrete block that can be broken on the production site or the construction site during loading and unloading and is also found abundantly in demolished buildings. This research aimed at searching for alternative construction materials through recycling and examined the properties of recycled fine aggregate from demolished (old) and construction (new) hollow concrete block (HCB) wastes. The study examined the effect of the recycled HCB on fresh and hardened C-25 concrete properties and the possible replacement percentage of river sand by those recycled fine aggregates. The research also examined the comparative properties of the two recycled fine aggregates. The replacement percentage was in steps of 25%, starting from 25% up to 100%, and 0% represented the reference mix. In general, the recycled fine aggregate exhibited relatively lower physical properties than natural river sand but satisfied the American Society for Testing and Materials (ASTM) standard requirements. The demolished recycled fine aggregate (DRFA) had slightly lower physical properties than the construction recycled fine aggregate (CRFA). The properties of fresh and hardened concrete were decreased as percentage replacement of DRFA and CRFA increased. The optimum percentage replacement of river sand by recycled fine aggregate was between 50% to 75% but was much closer to 75% for that of recycled from construction (new) and closer to 50% for that of recycled from demolished (old) HCB. Recycling wastes can reduce environmental impact due to sand mining and waste disposal as well as partially conserve the natural resource depletion.

ACS Style

Lucy Feleke Nigussie; Muge Mukaddes Darwish; Tewodros Ghebrab. Comparative Investigation of the Effect of Recycled Fine Aggregate from New and Old Construction Wastes in C-25 Concrete in Ethiopia. Sustainability 2019, 11, 7116 .

AMA Style

Lucy Feleke Nigussie, Muge Mukaddes Darwish, Tewodros Ghebrab. Comparative Investigation of the Effect of Recycled Fine Aggregate from New and Old Construction Wastes in C-25 Concrete in Ethiopia. Sustainability. 2019; 11 (24):7116.

Chicago/Turabian Style

Lucy Feleke Nigussie; Muge Mukaddes Darwish; Tewodros Ghebrab. 2019. "Comparative Investigation of the Effect of Recycled Fine Aggregate from New and Old Construction Wastes in C-25 Concrete in Ethiopia." Sustainability 11, no. 24: 7116.

Journal article
Published: 26 August 2019 in Sustainability
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The increase in the demand for concrete production for the development of infrastructures in developing countries like Ethiopia leads to the depletion of virgin aggregates and high cement demand, which imposes negative environmental impacts. In sustainable development, there is a need for construction materials to focus on the economy, efficient energy utilization, and environmental protections. One of the strategies in green concrete production is the use of locally available construction materials. Scoria is widely available around the central towns of Ethiopia, especially around the rift valley regions where huge construction activities are taking place. The aim of this paper is therefore to analyze the suitability of scoria as a fine aggregate for concrete production and its effect on the properties of concrete. A differing ratio of scoria was considered as a partial replacement of fine aggregate with river sand after analyzing its engineering properties, and its effect on the mechanical properties of concrete were examined. The test results on the engineering properties of scoria revealed that the material is suitable to be used as a fine aggregate in concrete production. The replacement of scoria with river sand also enhanced the mechanical strength of the concrete. Generally, the findings of the experimental study showed that scoria could replace river sand by up to 50% for conventional concrete production.

ACS Style

Getachew Kebede Warati; Muge Mukaddes Darwish; Fekadu Fufa Feyessa; Tewodros Ghebrab. Suitability of Scoria as Fine Aggregate and Its Effect on the Properties of Concrete. Sustainability 2019, 11, 4647 .

AMA Style

Getachew Kebede Warati, Muge Mukaddes Darwish, Fekadu Fufa Feyessa, Tewodros Ghebrab. Suitability of Scoria as Fine Aggregate and Its Effect on the Properties of Concrete. Sustainability. 2019; 11 (17):4647.

Chicago/Turabian Style

Getachew Kebede Warati; Muge Mukaddes Darwish; Fekadu Fufa Feyessa; Tewodros Ghebrab. 2019. "Suitability of Scoria as Fine Aggregate and Its Effect on the Properties of Concrete." Sustainability 11, no. 17: 4647.