| MECHANICAL AND DURABILITY EVALUATION OF CONCRETE PREPARED WITH RECYCLED AGGREGATE AND TREATED WASTEWATER Sara Ahmed1; Yazan Alhoubi1; Nouran Elmesalami1; Sherif Yehia1; Farid Abed1; 1AMERICAN UNIVERSITY OF SHARJAH, Sharjah, United Arab Emirates; PAPER: 311/Nonferrous/Regular (Oral) SCHEDULED: 17:50/Tue. 29 Nov. 2022/Arcadia 2 ABSTRACT: Conservation and reuse of natural resources in the construction industry are becoming crucial to maintain sustainable and environmentally friendly construction. The use of recycled aggregates (RA) and treated wastewater (TWW) in concrete has been widely studied in the literature over the past years. It has already been shown that replacing 20% to 30% of natural aggregates with RA and replacing TWW with tap water have negligible effects on the mechanical and durability properties of concrete [1-4]. However, only a limited number of studies were conducted to study the combined effect of using RA and TWW combined in concrete. In a study conducted by Tenjhay et al. [5], it was concluded that the use of RA and TWW combined in concrete is possible after additional research is conducted to study the durability. Therefore, the main aim of this study was to evaluate the mechanical properties and durability characteristics of concrete developed using 20% recycled aggregate and secondary treated wastewater subjected to different exposure conditions of tap water, treated wastewater, and salt water. Overall, the results showed that the use of 20% RA and TWW is only substantial on mechanical properties when concrete is exposed to either TWW or SW. The durability results on the other hand showed that all the mixes were considered durable in terms of chloride ion penetration (RCPT & resistivity results), however, additional tests are necessary to precisely study the impact of different variables on concrete durability. References: [1] N. A. Abdulla, “Effect of recycled coarse aggregate type on concrete,” J. Mater. Civ. Eng., 2015, doi: 10.1061/(ASCE) MT.1943-5533.0001247.<br />[2] S. B. Huda and M. Shahria Alam, “Mechanical and freeze-thaw durability properties of recycled aggregate concrete made with recycled coarse aggregate,” J. Mater. Civ. Eng., 2015, doi: 10.1061/(ASCE)MT.1943-5533.0001237.<br />[3] A. H. Noruzman, B. Muhammad, M. Ismail, and Z. Abdul-Majid, “Characteristics of treated effluents and their potential applications for producing concrete,” J. Environ. Manage., 2012, doi: 10.1016/j.jenvman.2012.05.019.<br />[4] M. K. J. Kucche, S. S. Jamkar, and P. A. Sadgir, “Quality of Water for Making Concrete:A Review of Literature,” Int. J. Sci. Res. Publ., vol. 5, no. 1, 2015, Accessed: Apr. 06, 2020. [Online]. Available: http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.663.5503&rep=rep1&type=pdf. <br />[5] M. G. Ramírez-Tenjhay, A. B. Vázquez-González, J. M. Gómez-Soberón, and F. G. Cabrera-Covarrubias, “Total replacement of recycled aggregate and treated wastewater: concrete recycling in extremis,” J. Sustain. Archit. Civ. Eng., 2016, doi: 10.5755/j01.sace.15.2.15464. |
